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/* Copyright (C) 2000-2003 MySQL AB
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   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
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   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */


/* logging of commands */
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/* TODO: Abort logging when we get an error in reading or writing log files */
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#include "mysql_priv.h"
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#include "sql_repl.h"
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#include "rpl_filter.h"
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#include <my_dir.h>
#include <stdarg.h>
#include <m_ctype.h>				// For test_if_number

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#ifdef __NT__
#include "message.h"
#endif

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#include <mysql/plugin.h>

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/* max size of the log message */
#define MAX_LOG_BUFFER_SIZE 1024
#define MAX_USER_HOST_SIZE 512
#define MAX_TIME_SIZE 32

LOGGER logger;

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MYSQL_BIN_LOG mysql_bin_log;
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ulong sync_binlog_counter= 0;
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static Muted_query_log_event invisible_commit;

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static bool test_if_number(const char *str,
			   long *res, bool allow_wildcards);
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static int binlog_init(void *p);
static int binlog_close_connection(handlerton *hton, THD *thd);
static int binlog_savepoint_set(handlerton *hton, THD *thd, void *sv);
static int binlog_savepoint_rollback(handlerton *hton, THD *thd, void *sv);
static int binlog_commit(handlerton *hton, THD *thd, bool all);
static int binlog_rollback(handlerton *hton, THD *thd, bool all);
static int binlog_prepare(handlerton *hton, THD *thd, bool all);
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sql_print_message_func sql_print_message_handlers[3] =
{
  sql_print_information,
  sql_print_warning,
  sql_print_error
};


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char *make_default_log_name(char *buff,const char* log_ext)
{
  strmake(buff, glob_hostname, FN_REFLEN-5);
  return fn_format(buff, buff, mysql_data_home, log_ext,
                   MYF(MY_UNPACK_FILENAME|MY_APPEND_EXT));
}

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/*
  This is a POD. Please keep it that way!

  Don't add constructors, destructors, or virtual functions.
*/
struct binlog_trx_data {
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  bool empty() const
  {
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#ifdef HAVE_ROW_BASED_REPLICATION
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    return pending == NULL && my_b_tell(&trans_log) == 0;
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#else
    return my_b_tell(&trans_log) == 0;
#endif
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  }
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  binlog_trx_data() {}
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  IO_CACHE trans_log;                         // The transaction cache
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#ifdef HAVE_ROW_BASED_REPLICATION
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  Rows_log_event *pending;                // The pending binrows event
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#endif
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};

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handlerton *binlog_hton;
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/*
  Open log table of a given type (general or slow log)

  SYNOPSIS
    open_log_table()

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    log_table_type   type of the log table to open: QUERY_LOG_GENERAL
                     or QUERY_LOG_SLOW
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  DESCRIPTION

    The function opens a log table and marks it as such. Log tables are open
    during the whole time, while server is running. Except for the moments
    when they have to be reopened: during FLUSH LOGS and TRUNCATE. This
    function is invoked directly only once during startup. All subsequent
    calls happen through reopen_log_table(), which performs additional check.

  RETURN
    FALSE - OK
    TRUE - error occured
*/

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bool Log_to_csv_event_handler::open_log_table(uint log_table_type)
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{
  THD *log_thd, *curr= current_thd;
  TABLE_LIST *table;
  bool error= FALSE;
  DBUG_ENTER("open_log_table");

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  switch (log_table_type) {
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  case QUERY_LOG_GENERAL:
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    log_thd= general_log_thd;
    table= &general_log;
    /* clean up table before reuse/initial usage */
    bzero((char*) table, sizeof(TABLE_LIST));
    table->alias= table->table_name= (char*) "general_log";
    table->table_name_length= 11;
    break;
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  case QUERY_LOG_SLOW:
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    log_thd= slow_log_thd;
    table= &slow_log;
    bzero((char*) table, sizeof(TABLE_LIST));
    table->alias= table->table_name= (char*) "slow_log";
    table->table_name_length= 8;
    break;
  default:
    DBUG_ASSERT(0);
  }

  /*
    This way we check that appropriate log thd was created ok during
    initialization. We cannot check "is_log_tables_initialized" var, as
    the very initialization is not finished until this function is
    completed in the very first time.
  */
  if (!log_thd)
  {
    DBUG_PRINT("error",("Cannot initialize log tables"));
    DBUG_RETURN(TRUE);
  }

  /*
    Set THD's thread_stack. This is needed to perform stack overrun
    check, which is done by some routines (e.g. open_table()).
    In the case we are called by thread, which already has this parameter
    set, we use this value. Otherwise we do a wild guess. This won't help
    to correctly track the stack overrun in these exceptional cases (which
    could probably happen only during startup and shutdown) but at least
    lets us to pass asserts.
    The problem stems from the fact that logger THDs are not real threads.
  */
  if (curr)
    log_thd->thread_stack= curr->thread_stack;
  else
    log_thd->thread_stack= (char*) &log_thd;

  log_thd->store_globals();

  table->lock_type= TL_WRITE_CONCURRENT_INSERT;
  table->db= log_thd->db;
  table->db_length= log_thd->db_length;

  if (simple_open_n_lock_tables(log_thd, table) ||
      table->table->file->extra(HA_EXTRA_MARK_AS_LOG_TABLE) ||
      table->table->file->ha_rnd_init(0))
    error= TRUE;
  else
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  {
    table->table->use_all_columns();
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    table->table->locked_by_logger= TRUE;
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  }
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  /* restore thread settings */
  if (curr)
    curr->store_globals();
  else
  {
    my_pthread_setspecific_ptr(THR_THD,  0);
    my_pthread_setspecific_ptr(THR_MALLOC, 0);
  }

  DBUG_RETURN(error);
}


Log_to_csv_event_handler::Log_to_csv_event_handler()
{
  /* init artificial THD's */
  general_log_thd= new THD;
  /* logger thread always works with mysql database */
  general_log_thd->db= my_strdup("mysql", MYF(0));
  general_log_thd->db_length= 5;

  slow_log_thd= new THD;
  /* logger thread always works with mysql database */
  slow_log_thd->db= my_strdup("mysql", MYF(0));;
  slow_log_thd->db_length= 5;
}


Log_to_csv_event_handler::~Log_to_csv_event_handler()
{
  /* now cleanup the tables */
  if (general_log_thd)
  {
    delete general_log_thd;
    general_log_thd= NULL;
  }

  if (slow_log_thd)
  {
    delete slow_log_thd;
    slow_log_thd= NULL;
  }
}


/*
  Reopen log table of a given type

  SYNOPSIS
    reopen_log_table()

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    log_table_type   type of the log table to open: QUERY_LOG_GENERAL
                     or QUERY_LOG_SLOW
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  DESCRIPTION

    The function is a wrapper around open_log_table(). It is used during
    FLUSH LOGS and TRUNCATE of the log tables (i.e. when we need to close
    and reopen them). The difference is in the check of the
    logger.is_log_tables_initialized var, which can't be done in
    open_log_table(), as it makes no sense during startup.

    NOTE: this code assumes that we have logger mutex locked

  RETURN
    FALSE - ok
    TRUE - open_log_table() returned an error
*/

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bool Log_to_csv_event_handler::reopen_log_table(uint log_table_type)
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{
  /* don't open the log table, if it wasn't enabled during startup */
  if (!logger.is_log_tables_initialized)
    return FALSE;
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  return open_log_table(log_table_type);
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}

void Log_to_csv_event_handler::cleanup()
{
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  if (opt_log)
    close_log_table(QUERY_LOG_GENERAL, FALSE);
  if (opt_slow_log)
    close_log_table(QUERY_LOG_SLOW, FALSE);
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  logger.is_log_tables_initialized= FALSE;
}

/* log event handlers */

/*
  Log command to the general log table

  SYNOPSIS
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    log_general()
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    event_time        command start timestamp
    user_host         the pointer to the string with user@host info
    user_host_len     length of the user_host string. this is computed once
                      and passed to all general log event handlers
    thread_id         Id of the thread, issued a query
    command_type      the type of the command being logged
    command_type_len  the length of the string above
    sql_text          the very text of the query being executed
    sql_text_len      the length of sql_text string

  DESCRIPTION

   Log given command to the general log table

  RETURN
    FALSE - OK
    TRUE - error occured
*/

bool Log_to_csv_event_handler::
  log_general(time_t event_time, const char *user_host,
              uint user_host_len, int thread_id,
              const char *command_type, uint command_type_len,
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              const char *sql_text, uint sql_text_len,
              CHARSET_INFO *client_cs)
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{
  TABLE *table= general_log.table;

  /* below should never happen */
  if (unlikely(!logger.is_log_tables_initialized))
    return FALSE;

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  /*
    NOTE: we do not call restore_record() here, as all fields are
    filled by the Logger (=> no need to load default ones).
  */

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  /* log table entries are not replicated at the moment */
  tmp_disable_binlog(current_thd);

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  /* Set current time. Required for CURRENT_TIMESTAMP to work */
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  general_log_thd->start_time= event_time;
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  /*
    We do not set a value for table->field[0], as it will use
    default value (which is CURRENT_TIMESTAMP).
  */
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  table->field[1]->store(user_host, user_host_len, client_cs);
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  table->field[1]->set_notnull();
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  table->field[2]->store((longlong) thread_id, TRUE);
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  table->field[2]->set_notnull();
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  table->field[3]->store((longlong) server_id, TRUE);
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  table->field[3]->set_notnull();
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  table->field[4]->store(command_type, command_type_len, client_cs);
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  table->field[4]->set_notnull();
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  table->field[5]->store(sql_text, sql_text_len, client_cs);
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  table->field[5]->set_notnull();
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  table->file->ha_write_row(table->record[0]);

  reenable_binlog(current_thd);

  return FALSE;
}


/*
  Log a query to the slow log table

  SYNOPSIS
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    log_slow()
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    thd               THD of the query
    current_time      current timestamp
    query_start_arg   command start timestamp
    user_host         the pointer to the string with user@host info
    user_host_len     length of the user_host string. this is computed once
                      and passed to all general log event handlers
    query_time        Amount of time the query took to execute (in seconds)
    lock_time         Amount of time the query was locked (in seconds)
    is_command        The flag, which determines, whether the sql_text is a
                      query or an administrator command (these are treated
                      differently by the old logging routines)
    sql_text          the very text of the query or administrator command
                      processed
    sql_text_len      the length of sql_text string

  DESCRIPTION

   Log a query to the slow log table

  RETURN
    FALSE - OK
    TRUE - error occured
*/

bool Log_to_csv_event_handler::
  log_slow(THD *thd, time_t current_time, time_t query_start_arg,
           const char *user_host, uint user_host_len,
           longlong query_time, longlong lock_time, bool is_command,
           const char *sql_text, uint sql_text_len)
{
  /* table variables */
  TABLE *table= slow_log.table;
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  CHARSET_INFO *client_cs= thd->variables.character_set_client;
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  DBUG_ENTER("log_slow");
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  /* below should never happen */
  if (unlikely(!logger.is_log_tables_initialized))
    return FALSE;

  /* log table entries are not replicated at the moment */
  tmp_disable_binlog(current_thd);

  /*
     Set start time for CURRENT_TIMESTAMP to the start of the query.
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     This will be default value for the field[0]
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  */
  slow_log_thd->start_time= query_start_arg;
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  restore_record(table, s->default_values);    // Get empty record
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  /*
    We do not set a value for table->field[0], as it will use
    default value.
  */
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  /* store the value */
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  table->field[1]->store(user_host, user_host_len, client_cs);
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  if (query_start_arg)
  {
    /* fill in query_time field */
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    table->field[2]->store(query_time, TRUE);
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    /* lock_time */
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    table->field[3]->store(lock_time, TRUE);
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    /* rows_sent */
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    table->field[4]->store((longlong) thd->sent_row_count, TRUE);
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    /* rows_examined */
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    table->field[5]->store((longlong) thd->examined_row_count, TRUE);
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  }
  else
  {
    table->field[2]->set_null();
    table->field[3]->set_null();
    table->field[4]->set_null();
    table->field[5]->set_null();
  }

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  /* fill database field */
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  if (thd->db)
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  {
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    table->field[6]->store(thd->db, thd->db_length, client_cs);
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    table->field[6]->set_notnull();
  }
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  if (thd->stmt_depends_on_first_successful_insert_id_in_prev_stmt)
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  {
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    table->field[7]->store((longlong)
                           thd->first_successful_insert_id_in_prev_stmt_for_binlog, TRUE);
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    table->field[7]->set_notnull();
  }
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  /*
    Set value if we do an insert on autoincrement column. Note that for
    some engines (those for which get_auto_increment() does not leave a
    table lock until the statement ends), this is just the first value and
    the next ones used may not be contiguous to it.
  */
  if (thd->auto_inc_intervals_in_cur_stmt_for_binlog.nb_elements() > 0)
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  {
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    table->field[8]->store((longlong)
                           thd->auto_inc_intervals_in_cur_stmt_for_binlog.minimum(), TRUE);
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    table->field[8]->set_notnull();
  }
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  table->field[9]->store((longlong) server_id, TRUE);
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  table->field[9]->set_notnull();
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  /* sql_text */
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  table->field[10]->store(sql_text,sql_text_len, client_cs);
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  /* write the row */
  table->file->ha_write_row(table->record[0]);

  reenable_binlog(current_thd);

  DBUG_RETURN(0);
}

bool Log_to_csv_event_handler::
  log_error(enum loglevel level, const char *format, va_list args)
{
  /* No log table is implemented */
  DBUG_ASSERT(0);
  return FALSE;
}

bool Log_to_file_event_handler::
  log_error(enum loglevel level, const char *format,
            va_list args)
{
  return vprint_msg_to_log(level, format, args);
}

void Log_to_file_event_handler::init_pthread_objects()
{
  mysql_log.init_pthread_objects();
  mysql_slow_log.init_pthread_objects();
}


/* Wrapper around MYSQL_LOG::write() for slow log */

bool Log_to_file_event_handler::
  log_slow(THD *thd, time_t current_time, time_t query_start_arg,
           const char *user_host, uint user_host_len,
           longlong query_time, longlong lock_time, bool is_command,
           const char *sql_text, uint sql_text_len)
{
  return mysql_slow_log.write(thd, current_time, query_start_arg,
                              user_host, user_host_len,
                              query_time, lock_time, is_command,
                              sql_text, sql_text_len);
}


/*
   Wrapper around MYSQL_LOG::write() for general log. We need it since we
   want all log event handlers to have the same signature.
*/

bool Log_to_file_event_handler::
  log_general(time_t event_time, const char *user_host,
              uint user_host_len, int thread_id,
              const char *command_type, uint command_type_len,
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              const char *sql_text, uint sql_text_len,
              CHARSET_INFO *client_cs)
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{
  return mysql_log.write(event_time, user_host, user_host_len,
                         thread_id, command_type, command_type_len,
                         sql_text, sql_text_len);
}


bool Log_to_file_event_handler::init()
{
  if (!is_initialized)
  {
    if (opt_slow_log)
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      mysql_slow_log.open_slow_log(sys_var_slow_log_path.value);
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    if (opt_log)
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      mysql_log.open_query_log(sys_var_general_log_path.value);
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    is_initialized= TRUE;
  }

  return FALSE;
}


void Log_to_file_event_handler::cleanup()
{
  mysql_log.cleanup();
  mysql_slow_log.cleanup();
}

void Log_to_file_event_handler::flush()
{
  /* reopen log files */
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  if (opt_log)
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    mysql_log.reopen_file();
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  if (opt_slow_log)
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    mysql_slow_log.reopen_file();
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}

/*
  Log error with all enabled log event handlers

  SYNOPSIS
    error_log_print()

    level             The level of the error significance: NOTE,
                      WARNING or ERROR.
    format            format string for the error message
    args              list of arguments for the format string

  RETURN
    FALSE - OK
    TRUE - error occured
*/

bool LOGGER::error_log_print(enum loglevel level, const char *format,
                             va_list args)
{
  bool error= FALSE;
  Log_event_handler **current_handler= error_log_handler_list;

  /* currently we don't need locking here as there is no error_log table */
  while (*current_handler)
    error= (*current_handler++)->log_error(level, format, args) || error;

  return error;
}


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void LOGGER::cleanup_base()
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{
  DBUG_ASSERT(inited == 1);
  (void) pthread_mutex_destroy(&LOCK_logger);
  if (table_log_handler)
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  {
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    table_log_handler->cleanup();
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    delete table_log_handler;
  }
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  if (file_log_handler)
    file_log_handler->cleanup();
}


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void LOGGER::cleanup_end()
{
  DBUG_ASSERT(inited == 1);
  if (file_log_handler)
    delete file_log_handler;
}


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void LOGGER::close_log_table(uint log_table_type, bool lock_in_use)
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{
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  table_log_handler->close_log_table(log_table_type, lock_in_use);
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}


/*
  Perform basic log initialization: create file-based log handler and
  init error log.
*/
void LOGGER::init_base()
{
  DBUG_ASSERT(inited == 0);
  inited= 1;

  /*
    Here we create file log handler. We don't do it for the table log handler
    here as it cannot be created so early. The reason is THD initialization,
    which depends on the system variables (parsed later).
  */
  if (!file_log_handler)
    file_log_handler= new Log_to_file_event_handler;

  /* by default we use traditional error log */
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  init_error_log(LOG_FILE);
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  file_log_handler->init_pthread_objects();
  (void) pthread_mutex_init(&LOCK_logger, MY_MUTEX_INIT_SLOW);
}


void LOGGER::init_log_tables()
{
  if (!table_log_handler)
    table_log_handler= new Log_to_csv_event_handler;

  if (!is_log_tables_initialized &&
      !table_log_handler->init() && !file_log_handler->init())
    is_log_tables_initialized= TRUE;
}


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bool LOGGER::reopen_log_table(uint log_table_type)
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{
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  return table_log_handler->reopen_log_table(log_table_type);
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}


bool LOGGER::flush_logs(THD *thd)
{
  TABLE_LIST close_slow_log, close_general_log;

  /* reopen log tables */
  bzero((char*) &close_slow_log, sizeof(TABLE_LIST));
  close_slow_log.alias= close_slow_log.table_name=(char*) "slow_log";
  close_slow_log.table_name_length= 8;
  close_slow_log.db= (char*) "mysql";
  close_slow_log.db_length= 5;

  bzero((char*) &close_general_log, sizeof(TABLE_LIST));
  close_general_log.alias= close_general_log.table_name=(char*) "general_log";
  close_general_log.table_name_length= 11;
  close_general_log.db= (char*) "mysql";
  close_general_log.db_length= 5;

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  /* lock tables, in the case they are enabled */
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  if (logger.is_log_tables_initialized)
  {
    /*
      This will lock and wait for all but the logger thread to release the
      tables. Then we could reopen log tables. Then release the name locks.

      NOTE: in fact, the first parameter used in lock_and_wait_for_table_name()
      and table_log_handler->flush() could be any non-NULL THD, as the
      underlying code makes certain assumptions about this.
      Here we use one of the logger handler THD's. Simply because it
      seems appropriate.
    */
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    if (opt_slow_log)
      lock_and_wait_for_table_name(table_log_handler->general_log_thd,
				   &close_slow_log);
    if (opt_log)
      lock_and_wait_for_table_name(table_log_handler->general_log_thd,
				   &close_general_log);
  }
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  /*
    Deny others from logging to general and slow log,
    while reopening tables.
  */
  logger.lock();

  /* reopen log files */
  file_log_handler->flush();
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  /* flush tables, in the case they are enabled */
  if (logger.is_log_tables_initialized)
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    table_log_handler->flush(table_log_handler->general_log_thd,
                             &close_slow_log, &close_general_log);
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  /* end of log flush */
  logger.unlock();
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  return FALSE;
}


/*
  Log slow query with all enabled log event handlers

  SYNOPSIS
    slow_log_print()

    thd               THD of the query being logged
    query             The query being logged
    query_length      The length of the query string
    query_start_arg   Query start timestamp

  RETURN
    FALSE - OK
    TRUE - error occured
*/

bool LOGGER::slow_log_print(THD *thd, const char *query, uint query_length,
                            time_t query_start_arg)
{
  bool error= FALSE;
  Log_event_handler **current_handler= slow_log_handler_list;
  bool is_command= FALSE;
  char user_host_buff[MAX_USER_HOST_SIZE];

  my_time_t current_time;
  Security_context *sctx= thd->security_ctx;
  uint message_buff_len= 0, user_host_len= 0;
  longlong query_time= 0, lock_time= 0;

  /*
    Print the message to the buffer if we have slow log enabled
  */

  if (*slow_log_handler_list)
  {
    current_time= time(NULL);

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    /* do not log slow queries from replication threads */
    if (thd->slave_thread)
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      return 0;

    lock();
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    if (!opt_slow_log)
    {
      unlock();
      return 0;
    }
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    /* fill in user_host value: the format is "%s[%s] @ %s [%s]" */
    user_host_len= strxnmov(user_host_buff, MAX_USER_HOST_SIZE,
                            sctx->priv_user ? sctx->priv_user : "", "[",
                            sctx->user ? sctx->user : "", "] @ ",
                            sctx->host ? sctx->host : "", " [",
                            sctx->ip ? sctx->ip : "", "]", NullS) -
      user_host_buff;

    if (query_start_arg)
    {
      query_time= (longlong) (current_time - query_start_arg);
      lock_time= (longlong) (thd->time_after_lock - query_start_arg);
    }

    if (!query)
    {
      is_command= TRUE;
      query= command_name[thd->command].str;
      query_length= command_name[thd->command].length;
    }

    while (*current_handler)
      error= (*current_handler++)->log_slow(thd, current_time, query_start_arg,
                                            user_host_buff, user_host_len,
                                            query_time, lock_time, is_command,
                                            query, query_length) || error;

    unlock();
  }
  return error;
}

bool LOGGER::general_log_print(THD *thd, enum enum_server_command command,
                               const char *format, va_list args)
{
  bool error= FALSE;
  Log_event_handler **current_handler= general_log_handler_list;

  /*
    Print the message to the buffer if we have at least one log event handler
    enabled and want to log this king of commands
  */
  if (*general_log_handler_list && (what_to_log & (1L << (uint) command)))
  {
    char message_buff[MAX_LOG_BUFFER_SIZE];
    char user_host_buff[MAX_USER_HOST_SIZE];
    Security_context *sctx= thd->security_ctx;
    ulong id;
    uint message_buff_len= 0, user_host_len= 0;

    if (thd)
    {                                           /* Normal thread */
      if ((thd->options & OPTION_LOG_OFF)
#ifndef NO_EMBEDDED_ACCESS_CHECKS
          && (sctx->master_access & SUPER_ACL)
#endif
         )
      {
        return 0;                         /* No logging */
      }
      id= thd->thread_id;
    }
    else
      id=0;                                     /* Log from connect handler */

    lock();
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    if (!opt_log)
    {
      unlock();
      return 0;
    }
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    time_t current_time= time(NULL);

    user_host_len= strxnmov(user_host_buff, MAX_USER_HOST_SIZE,
                            sctx->priv_user ? sctx->priv_user : "", "[",
                            sctx->user ? sctx->user : "", "] @ ",
                            sctx->host ? sctx->host : "", " [",
                            sctx->ip ? sctx->ip : "", "]", NullS) -
                                                            user_host_buff;

    /* prepare message */
    if (format)
      message_buff_len= my_vsnprintf(message_buff,
                   sizeof(message_buff), format, args);
    else
      message_buff[0]= '\0';

    while (*current_handler)
      error+= (*current_handler++)->
        log_general(current_time, user_host_buff,
                   user_host_len, id,
                   command_name[(uint) command].str,
                   command_name[(uint) command].length,
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                   message_buff, message_buff_len,
                   thd->variables.character_set_client) || error;
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    unlock();
  }
  return error;
}

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void LOGGER::init_error_log(uint error_log_printer)
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{
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  if (error_log_printer & LOG_NONE)
  {
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    error_log_handler_list[0]= 0;
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    return;
  }

  switch (error_log_printer) {
  case LOG_FILE:
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    error_log_handler_list[0]= file_log_handler;
    error_log_handler_list[1]= 0;
    break;
    /* these two are disabled for now */
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  case LOG_TABLE:
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    DBUG_ASSERT(0);
    break;
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  case LOG_TABLE|LOG_FILE:
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    DBUG_ASSERT(0);
    break;
  }
}

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void LOGGER::init_slow_log(uint slow_log_printer)
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{
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  if (slow_log_printer & LOG_NONE)
  {
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    slow_log_handler_list[0]= 0;
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    return;
  }

  switch (slow_log_printer) {
  case LOG_FILE:
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    slow_log_handler_list[0]= file_log_handler;
    slow_log_handler_list[1]= 0;
    break;
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  case LOG_TABLE:
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    slow_log_handler_list[0]= table_log_handler;
    slow_log_handler_list[1]= 0;
    break;
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  case LOG_TABLE|LOG_FILE:
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    slow_log_handler_list[0]= file_log_handler;
    slow_log_handler_list[1]= table_log_handler;
    slow_log_handler_list[2]= 0;
    break;
  }
}

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void LOGGER::init_general_log(uint general_log_printer)
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{
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  if (general_log_printer & LOG_NONE)
  {
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    general_log_handler_list[0]= 0;
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    return;
  }

  switch (general_log_printer) {
  case LOG_FILE:
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    general_log_handler_list[0]= file_log_handler;
    general_log_handler_list[1]= 0;
    break;
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  case LOG_TABLE:
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    general_log_handler_list[0]= table_log_handler;
    general_log_handler_list[1]= 0;
    break;
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  case LOG_TABLE|LOG_FILE:
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    general_log_handler_list[0]= file_log_handler;
    general_log_handler_list[1]= table_log_handler;
    general_log_handler_list[2]= 0;
    break;
  }
}


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bool LOGGER::activate_log_handler(THD* thd, uint log_type)
{
  bool res= 0;
  lock();
  switch (log_type) {
  case QUERY_LOG_SLOW:
    if (!opt_slow_log)
    {
      if ((res= reopen_log_table(log_type)))
        goto err;
      file_log_handler->get_mysql_slow_log()->
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        open_slow_log(sys_var_slow_log_path.value);
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      init_slow_log(log_output_options);
      opt_slow_log= TRUE;
    }
    break;
  case QUERY_LOG_GENERAL:
    if (!opt_log)
    {
      if ((res= reopen_log_table(log_type)))
        goto err;
      file_log_handler->get_mysql_log()->
        open_query_log(sys_var_general_log_path.value);
      init_general_log(log_output_options);
      opt_log= TRUE;
    }
    break;
  default:
    DBUG_ASSERT(0);
  }
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  unlock();
  return res;
}


void LOGGER::deactivate_log_handler(THD *thd, uint log_type)
{
  TABLE_LIST *table_list;
  my_bool *tmp_opt= 0;
  MYSQL_LOG *file_log;
  THD *log_thd;

  switch (log_type) {
  case QUERY_LOG_SLOW:
    table_list= &table_log_handler->slow_log;
    tmp_opt= &opt_slow_log;
    file_log= file_log_handler->get_mysql_slow_log();
    log_thd= table_log_handler->slow_log_thd;
    break;
  case QUERY_LOG_GENERAL:
    table_list= &table_log_handler->general_log;
    tmp_opt= &opt_log;
    file_log= file_log_handler->get_mysql_log();
    log_thd= table_log_handler->general_log_thd;
    break;
  default:
    DBUG_ASSERT(0);
  }

  if (!(*tmp_opt))
    return;

  if (is_log_tables_initialized)
    lock_and_wait_for_table_name(log_thd, table_list);
  lock();

  if (is_log_tables_initialized)
  {
    VOID(pthread_mutex_lock(&LOCK_open));
    close_log_table(log_type, TRUE);
    table_list->table= 0;
    query_cache_invalidate3(log_thd, table_list, 0);
    unlock_table_name(log_thd, table_list);
    VOID(pthread_mutex_unlock(&LOCK_open));
  }
  file_log->close(0);
  *tmp_opt= FALSE;
  unlock();
}


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bool Log_to_csv_event_handler::flush(THD *thd, TABLE_LIST *close_slow_log,
                                     TABLE_LIST *close_general_log)
{
  VOID(pthread_mutex_lock(&LOCK_open));
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  if (opt_log)
  {
    close_log_table(QUERY_LOG_GENERAL, TRUE);
    query_cache_invalidate3(thd, close_general_log, 0);
    unlock_table_name(thd, close_general_log);
  }
  if (opt_slow_log)
  {
    close_log_table(QUERY_LOG_SLOW, TRUE);
    query_cache_invalidate3(thd, close_slow_log, 0);
    unlock_table_name(thd, close_slow_log);
  }
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  VOID(pthread_mutex_unlock(&LOCK_open));
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  /*
    we use | and not || here, to ensure that both reopen_log_table
    are called, even if the first one fails
  */
  if ((opt_slow_log && reopen_log_table(QUERY_LOG_SLOW)) |
      (opt_log && reopen_log_table(QUERY_LOG_GENERAL)))
    return 1;
  return 0;
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}

/* the parameters are unused for the log tables */
bool Log_to_csv_event_handler::init()
{
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  /*
    we use | and not || here, to ensure that both open_log_table
    are called, even if the first one fails
  */
  if ((opt_log && open_log_table(QUERY_LOG_GENERAL)) |
      (opt_slow_log && open_log_table(QUERY_LOG_SLOW)))
    return 1;
  return 0;
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}

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int LOGGER::set_handlers(uint error_log_printer,
                         uint slow_log_printer,
                         uint general_log_printer)
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{
  /* error log table is not supported yet */
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  DBUG_ASSERT(error_log_printer < LOG_TABLE);
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  lock();

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  if ((slow_log_printer & LOG_TABLE || general_log_printer & LOG_TABLE) &&
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      !is_log_tables_initialized)
  {
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    slow_log_printer= (slow_log_printer & ~LOG_TABLE) | LOG_FILE;
    general_log_printer= (general_log_printer & ~LOG_TABLE) | LOG_FILE;
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    sql_print_error("Failed to initialize log tables. "
                    "Falling back to the old-fashioned logs");
  }

  init_error_log(error_log_printer);
  init_slow_log(slow_log_printer);
  init_general_log(general_log_printer);

  unlock();

  return 0;
}


/*
  Close log table of a given type (general or slow log)

  SYNOPSIS
    close_log_table()

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    log_table_type   type of the log table to close: QUERY_LOG_GENERAL
                     or QUERY_LOG_SLOW
    lock_in_use      Set to TRUE if the caller owns LOCK_open. FALSE otherwise.
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  DESCRIPTION

    The function closes a log table. It is invoked (1) when we need to reopen
    log tables (e.g. FLUSH LOGS or TRUNCATE on the log table is being
    executed) or (2) during shutdown.
*/

void Log_to_csv_event_handler::
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  close_log_table(uint log_table_type, bool lock_in_use)
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{
  THD *log_thd, *curr= current_thd;
  TABLE_LIST *table;

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  switch (log_table_type) {
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  case QUERY_LOG_GENERAL:
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    if (!logger.is_general_log_table_enabled())
      return;                                     /* do nothing */
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    log_thd= general_log_thd;
    table= &general_log;
    break;
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  case QUERY_LOG_SLOW:
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    if (!logger.is_slow_log_table_enabled())
      return;                                     /* do nothing */
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    log_thd= slow_log_thd;
    table= &slow_log;
    break;
  default:
    DBUG_ASSERT(0);
  }

  /*
    Set thread stack start for the logger thread. See comment in
    open_log_table() for details.
  */
  if (curr)
    log_thd->thread_stack= curr->thread_stack;
  else
    log_thd->thread_stack= (char*) &log_thd;

  /* close the table */
  log_thd->store_globals();
  table->table->file->ha_rnd_end();
  /* discard logger mark before unlock*/
  table->table->locked_by_logger= FALSE;
  close_thread_tables(log_thd, lock_in_use);

  if (curr)
    curr->store_globals();
  else
  {
    my_pthread_setspecific_ptr(THR_THD,  0);
    my_pthread_setspecific_ptr(THR_MALLOC, 0);
  }
}


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/*
  this function is mostly a placeholder.
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  conceptually, binlog initialization (now mostly done in MYSQL_BIN_LOG::open)
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  should be moved here.
*/

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int binlog_init(void *p)
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{
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  binlog_hton= (handlerton *)p;
  binlog_hton->state=opt_bin_log ? SHOW_OPTION_YES : SHOW_OPTION_NO;
  binlog_hton->db_type=DB_TYPE_BINLOG;
  binlog_hton->savepoint_offset= sizeof(my_off_t);
  binlog_hton->close_connection= binlog_close_connection;
  binlog_hton->savepoint_set= binlog_savepoint_set;
  binlog_hton->savepoint_rollback= binlog_savepoint_rollback;
  binlog_hton->commit= binlog_commit;
  binlog_hton->rollback= binlog_rollback;
  binlog_hton->prepare= binlog_prepare;
  binlog_hton->flags= HTON_NOT_USER_SELECTABLE | HTON_HIDDEN;
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  return 0;
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}

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static int binlog_close_connection(handlerton *hton, THD *thd)
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{
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  binlog_trx_data *const trx_data=
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    (binlog_trx_data*) thd->ha_data[binlog_hton->slot];
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  IO_CACHE *trans_log= &trx_data->trans_log;
  DBUG_ASSERT(mysql_bin_log.is_open() && trx_data->empty());
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  close_cached_file(trans_log);
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  thd->ha_data[binlog_hton->slot]= 0;
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  my_free((gptr)trx_data, MYF(0));
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  return 0;
}

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static int
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binlog_end_trans(THD *thd, binlog_trx_data *trx_data, 
                 Log_event *end_ev)
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{
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  DBUG_ENTER("binlog_end_trans");
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  int error=0;
  IO_CACHE *trans_log= &trx_data->trans_log;

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  /* NULL denotes ROLLBACK with nothing to replicate */
  if (end_ev != NULL)
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  {
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    /*
      We can always end the statement when ending a transaction since
      transactions are not allowed inside stored functions.  If they
      were, we would have to ensure that we're not ending a statement
      inside a stored function.
     */
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#ifdef HAVE_ROW_BASED_REPLICATION
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    thd->binlog_flush_pending_rows_event(TRUE);
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#endif
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    error= mysql_bin_log.write(thd, trans_log, end_ev);
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  }
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#ifdef HAVE_ROW_BASED_REPLICATION
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  else
  {
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#ifdef HAVE_ROW_BASED_REPLICATION
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    thd->binlog_delete_pending_rows_event();
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#endif
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  }

  /*
    We need to step the table map version both after writing the
    entire transaction to the log file and after rolling back the
    transaction.

    We need to step the table map version after writing the
    transaction cache to disk.  In addition, we need to step the table
    map version on a rollback to ensure that a new table map event is
    generated instead of the one that was written to the thrown-away
    transaction cache.
  */
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  mysql_bin_log.update_table_map_version();
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#endif
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  statistic_increment(binlog_cache_use, &LOCK_status);
  if (trans_log->disk_writes != 0)
  {
    statistic_increment(binlog_cache_disk_use, &LOCK_status);
    trans_log->disk_writes= 0;
  }
  reinit_io_cache(trans_log, WRITE_CACHE, (my_off_t) 0, 0, 1); // cannot fail
  trans_log->end_of_file= max_binlog_cache_size;
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  DBUG_RETURN(error);
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}

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static int binlog_prepare(handlerton *hton, THD *thd, bool all)
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{
  /*
    do nothing.
    just pretend we can do 2pc, so that MySQL won't
    switch to 1pc.
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    real work will be done in MYSQL_BIN_LOG::log()
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  */
  return 0;
}

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static int binlog_commit(handlerton *hton, THD *thd, bool all)
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{
  DBUG_ENTER("binlog_commit");
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  binlog_trx_data *const trx_data=
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    (binlog_trx_data*) thd->ha_data[binlog_hton->slot];
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  IO_CACHE *trans_log= &trx_data->trans_log;
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  DBUG_ASSERT(mysql_bin_log.is_open() &&
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     (all || !(thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN))));
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  if (trx_data->empty())
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  {
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    // we're here because trans_log was flushed in MYSQL_BIN_LOG::log()
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    DBUG_RETURN(0);
  }
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  if (all) 
  {
    Query_log_event qev(thd, STRING_WITH_LEN("COMMIT"), TRUE, FALSE);
    qev.error_code= 0; // see comment in MYSQL_LOG::write(THD, IO_CACHE)
    DBUG_RETURN(binlog_end_trans(thd, trx_data, &qev));
  }
  else
    DBUG_RETURN(binlog_end_trans(thd, trx_data, &invisible_commit));
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}

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static int binlog_rollback(handlerton *hton, THD *thd, bool all)
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{
  DBUG_ENTER("binlog_rollback");
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  int error=0;
  binlog_trx_data *const trx_data=
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    (binlog_trx_data*) thd->ha_data[binlog_hton->slot];
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  IO_CACHE *trans_log= &trx_data->trans_log;
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  /*
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    First assert is guaranteed - see trans_register_ha() call below.
    The second must be true. If it is not, we're registering
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    unnecessary, doing extra work. The cause should be found and eliminated
  */
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  DBUG_ASSERT(all || !(thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)));
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  DBUG_ASSERT(mysql_bin_log.is_open() && !trx_data->empty());
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  /*
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    Update the binary log with a BEGIN/ROLLBACK block if we have
    cached some queries and we updated some non-transactional
    table. Such cases should be rare (updating a
    non-transactional table inside a transaction...)
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  */
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  if (unlikely(thd->options & (OPTION_STATUS_NO_TRANS_UPDATE |
                               OPTION_KEEP_LOG)))
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  {
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    Query_log_event qev(thd, STRING_WITH_LEN("ROLLBACK"), TRUE, FALSE);
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    qev.error_code= 0; // see comment in MYSQL_LOG::write(THD, IO_CACHE)
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    error= binlog_end_trans(thd, trx_data, &qev);
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  }
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  else
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    error= binlog_end_trans(thd, trx_data, 0);
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  DBUG_RETURN(error);
}

/*
  NOTE: how do we handle this (unlikely but legal) case:
  [transaction] + [update to non-trans table] + [rollback to savepoint] ?
  The problem occurs when a savepoint is before the update to the
  non-transactional table. Then when there's a rollback to the savepoint, if we
  simply truncate the binlog cache, we lose the part of the binlog cache where
  the update is. If we want to not lose it, we need to write the SAVEPOINT
  command and the ROLLBACK TO SAVEPOINT command to the binlog cache. The latter
  is easy: it's just write at the end of the binlog cache, but the former
  should be *inserted* to the place where the user called SAVEPOINT. The
  solution is that when the user calls SAVEPOINT, we write it to the binlog
  cache (so no need to later insert it). As transactions are never intermixed
  in the binary log (i.e. they are serialized), we won't have conflicts with
  savepoint names when using mysqlbinlog or in the slave SQL thread.
  Then when ROLLBACK TO SAVEPOINT is called, if we updated some
  non-transactional table, we don't truncate the binlog cache but instead write
  ROLLBACK TO SAVEPOINT to it; otherwise we truncate the binlog cache (which
  will chop the SAVEPOINT command from the binlog cache, which is good as in
  that case there is no need to have it in the binlog).
*/

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static int binlog_savepoint_set(handlerton *hton, THD *thd, void *sv)
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{
  DBUG_ENTER("binlog_savepoint_set");
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  binlog_trx_data *const trx_data=
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    (binlog_trx_data*) thd->ha_data[binlog_hton->slot];
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  DBUG_ASSERT(mysql_bin_log.is_open() && my_b_tell(&trx_data->trans_log));
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  *(my_off_t *)sv= my_b_tell(&trx_data->trans_log);
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  /* Write it to the binary log */
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  int const error=
    thd->binlog_query(THD::STMT_QUERY_TYPE,
                      thd->query, thd->query_length, TRUE, FALSE);
  DBUG_RETURN(error);
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}

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static int binlog_savepoint_rollback(handlerton *hton, THD *thd, void *sv)
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{
  DBUG_ENTER("binlog_savepoint_rollback");
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  binlog_trx_data *const trx_data=
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    (binlog_trx_data*) thd->ha_data[binlog_hton->slot];
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  IO_CACHE *trans_log= &trx_data->trans_log;
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  DBUG_ASSERT(mysql_bin_log.is_open() && my_b_tell(trans_log));

  /*
    Write ROLLBACK TO SAVEPOINT to the binlog cache if we have updated some
    non-transactional table. Otherwise, truncate the binlog cache starting
    from the SAVEPOINT command.
  */
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  if (unlikely(thd->options &
               (OPTION_STATUS_NO_TRANS_UPDATE | OPTION_KEEP_LOG)))
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  {
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    int const error=
      thd->binlog_query(THD::STMT_QUERY_TYPE,
                        thd->query, thd->query_length, TRUE, FALSE);
    DBUG_RETURN(error);
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  }
  reinit_io_cache(trans_log, WRITE_CACHE, *(my_off_t *)sv, 0, 0);
  DBUG_RETURN(0);
}

int check_binlog_magic(IO_CACHE* log, const char** errmsg)
{
  char magic[4];
  DBUG_ASSERT(my_b_tell(log) == 0);

  if (my_b_read(log, (byte*) magic, sizeof(magic)))
  {
    *errmsg = "I/O error reading the header from the binary log";
    sql_print_error("%s, errno=%d, io cache code=%d", *errmsg, my_errno,
		    log->error);
    return 1;
  }
  if (memcmp(magic, BINLOG_MAGIC, sizeof(magic)))
  {
    *errmsg = "Binlog has bad magic number;  It's not a binary log file that can be used by this version of MySQL";
    return 1;
  }
  return 0;
}

File open_binlog(IO_CACHE *log, const char *log_file_name, const char **errmsg)
{
  File file;
  DBUG_ENTER("open_binlog");

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  if ((file = my_open(log_file_name, O_RDONLY | O_BINARY | O_SHARE, 
                      MYF(MY_WME))) < 0)
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  {
    sql_print_error("Failed to open log (file '%s', errno %d)",
                    log_file_name, my_errno);
    *errmsg = "Could not open log file";
    goto err;
  }
  if (init_io_cache(log, file, IO_SIZE*2, READ_CACHE, 0, 0,
                    MYF(MY_WME|MY_DONT_CHECK_FILESIZE)))
  {
    sql_print_error("Failed to create a cache on log (file '%s')",
                    log_file_name);
    *errmsg = "Could not open log file";
    goto err;
  }
  if (check_binlog_magic(log,errmsg))
    goto err;
  DBUG_RETURN(file);

err:
  if (file >= 0)
  {
    my_close(file,MYF(0));
    end_io_cache(log);
  }
  DBUG_RETURN(-1);
}
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#ifdef __NT__
static int eventSource = 0;
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void setup_windows_event_source()
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{
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  HKEY    hRegKey= NULL;
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  DWORD   dwError= 0;
  TCHAR   szPath[MAX_PATH];
  DWORD dwTypes;
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  if (eventSource)               // Ensure that we are only called once
    return;
  eventSource= 1;
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  // Create the event source registry key
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  dwError= RegCreateKey(HKEY_LOCAL_MACHINE,
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                          "SYSTEM\\CurrentControlSet\\Services\\EventLog\\Application\\MySQL", 
                          &hRegKey);
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  /* Name of the PE module that contains the message resource */
  GetModuleFileName(NULL, szPath, MAX_PATH);
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  /* Register EventMessageFile */
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  dwError = RegSetValueEx(hRegKey, "EventMessageFile", 0, REG_EXPAND_SZ,
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                          (PBYTE) szPath, strlen(szPath)+1);
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  /* Register supported event types */
  dwTypes= (EVENTLOG_ERROR_TYPE | EVENTLOG_WARNING_TYPE |
            EVENTLOG_INFORMATION_TYPE);
  dwError= RegSetValueEx(hRegKey, "TypesSupported", 0, REG_DWORD,
                         (LPBYTE) &dwTypes, sizeof dwTypes);
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  RegCloseKey(hRegKey);
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}

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#endif /* __NT__ */
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/****************************************************************************
** Find a uniq filename for 'filename.#'.
** Set # to a number as low as possible
** returns != 0 if not possible to get uniq filename
****************************************************************************/

static int find_uniq_filename(char *name)
{
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  long                  number;
  uint                  i;
  char                  buff[FN_REFLEN];
  struct st_my_dir     *dir_info;
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  reg1 struct fileinfo *file_info;
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  ulong                 max_found=0;

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  DBUG_ENTER("find_uniq_filename");

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  uint  length = dirname_part(buff,name);
  char *start  = name + length;
  char *end    = strend(start);

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  *end='.';
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  length= (uint) (end-start+1);
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  if (!(dir_info = my_dir(buff,MYF(MY_DONT_SORT))))
  {						// This shouldn't happen
    strmov(end,".1");				// use name+1
    DBUG_RETURN(0);
  }
  file_info= dir_info->dir_entry;
  for (i=dir_info->number_off_files ; i-- ; file_info++)
  {
    if (bcmp(file_info->name,start,length) == 0 &&
	test_if_number(file_info->name+length, &number,0))
    {
      set_if_bigger(max_found,(ulong) number);
    }
  }
  my_dirend(dir_info);

  *end++='.';
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  sprintf(end,"%06ld",max_found+1);
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  DBUG_RETURN(0);
}

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void MYSQL_LOG::init(enum_log_type log_type_arg,
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                     enum cache_type io_cache_type_arg)
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{
  DBUG_ENTER("MYSQL_LOG::init");
  log_type= log_type_arg;
  io_cache_type= io_cache_type_arg;
  DBUG_PRINT("info",("log_type: %d", log_type));
  DBUG_VOID_RETURN;
}


/*
  Open a (new) log file.

  SYNOPSIS
    open()

    log_name            The name of the log to open
    log_type_arg        The type of the log. E.g. LOG_NORMAL
    new_name            The new name for the logfile. This is only needed
                        when the method is used to open the binlog file.
    io_cache_type_arg   The type of the IO_CACHE to use for this log file

  DESCRIPTION
    Open the logfile, init IO_CACHE and write startup messages
    (in case of general and slow query logs).

  RETURN VALUES
    0   ok
    1   error
*/

bool MYSQL_LOG::open(const char *log_name, enum_log_type log_type_arg,
                     const char *new_name, enum cache_type io_cache_type_arg)
{
  char buff[FN_REFLEN];
  File file= -1;
  int open_flags= O_CREAT | O_BINARY;
  DBUG_ENTER("MYSQL_LOG::open");
  DBUG_PRINT("enter", ("log_type: %d", (int) log_type_arg));

  write_error= 0;

  init(log_type_arg, io_cache_type_arg);

  if (!(name= my_strdup(log_name, MYF(MY_WME))))
  {
    name= (char *)log_name; // for the error message
    goto err;
  }

  if (new_name)
    strmov(log_file_name, new_name);
  else if (generate_new_name(log_file_name, name))
    goto err;

  if (io_cache_type == SEQ_READ_APPEND)
    open_flags |= O_RDWR | O_APPEND;
  else
    open_flags |= O_WRONLY | (log_type == LOG_BIN ? 0 : O_APPEND);

  db[0]= 0;

  if ((file= my_open(log_file_name, open_flags,
                     MYF(MY_WME | ME_WAITTANG))) < 0 ||
      init_io_cache(&log_file, file, IO_SIZE, io_cache_type,
                    my_tell(file, MYF(MY_WME)), 0,
                    MYF(MY_WME | MY_NABP |
                        ((log_type == LOG_BIN) ? MY_WAIT_IF_FULL : 0))))
    goto err;

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  if (log_type == LOG_NORMAL)
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  {
    char *end;
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    int len=my_snprintf(buff, sizeof(buff), "%s, Version: %s (%s). "
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#ifdef EMBEDDED_LIBRARY
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                        "embedded library\n",
                        my_progname, server_version, MYSQL_COMPILATION_COMMENT
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#elif __NT__
			"started with:\nTCP Port: %d, Named Pipe: %s\n",
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                        my_progname, server_version, MYSQL_COMPILATION_COMMENT,
                        mysqld_port, mysqld_unix_port
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#else
			"started with:\nTcp port: %d  Unix socket: %s\n",
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                        my_progname, server_version, MYSQL_COMPILATION_COMMENT,
                        mysqld_port, mysqld_unix_port
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#endif
                       );
    end= strnmov(buff + len, "Time                 Id Command    Argument\n",
                 sizeof(buff) - len);
    if (my_b_write(&log_file, (byte*) buff, (uint) (end-buff)) ||
	flush_io_cache(&log_file))
      goto err;
  }

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  log_state= LOG_OPENED;
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  DBUG_RETURN(0);

err:
  sql_print_error("Could not use %s for logging (error %d). \
Turning logging off for the whole duration of the MySQL server process. \
To turn it on again: fix the cause, \
shutdown the MySQL server and restart it.", name, errno);
  if (file >= 0)
    my_close(file, MYF(0));
  end_io_cache(&log_file);
  safeFree(name);
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  log_state= LOG_CLOSED;
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  DBUG_RETURN(1);
}

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MYSQL_LOG::MYSQL_LOG()
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  : name(0),  log_type(LOG_UNKNOWN), log_state(LOG_CLOSED), write_error(FALSE),
    inited(FALSE)
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{
  /*
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    We don't want to initialize LOCK_Log here as such initialization depends on
    safe_mutex (when using safe_mutex) which depends on MY_INIT(), which is
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    called only in main(). Doing initialization here would make it happen
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    before main().
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  */
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  bzero((char*) &log_file, sizeof(log_file));
}

void MYSQL_LOG::init_pthread_objects()
{
  DBUG_ASSERT(inited == 0);
  inited= 1;
  (void) pthread_mutex_init(&LOCK_log, MY_MUTEX_INIT_SLOW);
}

/*
  Close the log file

  SYNOPSIS
    close()
    exiting     Bitmask. For the slow and general logs the only used bit is
                LOG_CLOSE_TO_BE_OPENED. This is used if we intend to call
                open at once after close.

  NOTES
    One can do an open on the object at once after doing a close.
    The internal structures are not freed until cleanup() is called
*/

void MYSQL_LOG::close(uint exiting)
{					// One can't set log_type here!
  DBUG_ENTER("MYSQL_LOG::close");
  DBUG_PRINT("enter",("exiting: %d", (int) exiting));
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  if (log_state == LOG_OPENED)
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  {
    end_io_cache(&log_file);

    if (my_sync(log_file.file, MYF(MY_WME)) && ! write_error)
    {
      write_error= 1;
      sql_print_error(ER(ER_ERROR_ON_WRITE), name, errno);
    }

    if (my_close(log_file.file, MYF(MY_WME)) && ! write_error)
    {
      write_error= 1;
      sql_print_error(ER(ER_ERROR_ON_WRITE), name, errno);
    }
  }

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  log_state= (exiting & LOG_CLOSE_TO_BE_OPENED) ? LOG_TO_BE_OPENED : LOG_CLOSED;
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  safeFree(name);
  DBUG_VOID_RETURN;
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}

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/* this is called only once */
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void MYSQL_LOG::cleanup()
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{
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  DBUG_ENTER("cleanup");
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  if (inited)
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  {
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    inited= 0;
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    (void) pthread_mutex_destroy(&LOCK_log);
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    close(0);
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  }
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  DBUG_VOID_RETURN;
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}

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int MYSQL_LOG::generate_new_name(char *new_name, const char *log_name)
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{
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  fn_format(new_name, log_name, mysql_data_home, "", 4);
  if (log_type == LOG_BIN)
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  {
    if (!fn_ext(log_name)[0])
    {
      if (find_uniq_filename(new_name))
      {
	sql_print_error(ER(ER_NO_UNIQUE_LOGFILE), log_name);
	return 1;
      }
    }
  }
  return 0;
}

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/*
  Reopen the log file

  SYNOPSIS
    reopen_file()

  DESCRIPTION
    Reopen the log file. The method is used during FLUSH LOGS
    and locks LOCK_log mutex
*/


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void MYSQL_QUERY_LOG::reopen_file()
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{
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  char *save_name;

  DBUG_ENTER("MYSQL_LOG::reopen_file");
  if (!is_open())
  {
    DBUG_PRINT("info",("log is closed"));
    DBUG_VOID_RETURN;
  }

  pthread_mutex_lock(&LOCK_log);

  save_name= name;
  name= 0;				// Don't free name
  close(LOG_CLOSE_TO_BE_OPENED);

  /*
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     Note that at this point, log_state != LOG_CLOSED (important for is_open()).
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  */

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  open(save_name, log_type, 0, io_cache_type);
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  my_free(save_name, MYF(0));

  pthread_mutex_unlock(&LOCK_log);

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  DBUG_VOID_RETURN;
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}

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/*
  Write a command to traditional general log file

  SYNOPSIS
    write()

    event_time        command start timestamp
    user_host         the pointer to the string with user@host info
    user_host_len     length of the user_host string. this is computed once
                      and passed to all general log  event handlers
    thread_id         Id of the thread, issued a query
    command_type      the type of the command being logged
    command_type_len  the length of the string above
    sql_text          the very text of the query being executed
    sql_text_len      the length of sql_text string

  DESCRIPTION

   Log given command to to normal (not rotable) log file

  RETURN
    FASE - OK
    TRUE - error occured
*/

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bool MYSQL_QUERY_LOG::write(time_t event_time, const char *user_host,
                            uint user_host_len, int thread_id,
                            const char *command_type, uint command_type_len,
                            const char *sql_text, uint sql_text_len)
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{
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  char buff[32];
  uint length= 0;
  char time_buff[MAX_TIME_SIZE];
  struct tm start;
  uint time_buff_len= 0;

  /* Test if someone closed between the is_open test and lock */
  if (is_open())
  {
    /* Note that my_b_write() assumes it knows the length for this */
      if (event_time != last_time)
      {
        last_time= event_time;

        localtime_r(&event_time, &start);

        time_buff_len= my_snprintf(time_buff, MAX_TIME_SIZE,
                                   "%02d%02d%02d %2d:%02d:%02d",
                                   start.tm_year % 100, start.tm_mon + 1,
                                   start.tm_mday, start.tm_hour,
                                   start.tm_min, start.tm_sec);

        if (my_b_write(&log_file, (byte*) &time_buff, time_buff_len))
          goto err;
      }
      else
        if (my_b_write(&log_file, (byte*) "\t\t" ,2) < 0)
          goto err;

    /* command_type, thread_id */
    length= my_snprintf(buff, 32, "%5ld ", thread_id);

    if (my_b_write(&log_file, (byte*) buff, length))
      goto err;

    if (my_b_write(&log_file, (byte*) command_type, command_type_len))
      goto err;

    if (my_b_write(&log_file, (byte*) "\t", 1))
      goto err;

    /* sql_text */
    if (my_b_write(&log_file, (byte*) sql_text, sql_text_len))
      goto err;

    if (my_b_write(&log_file, (byte*) "\n", 1) ||
        flush_io_cache(&log_file))
      goto err;
  }

  return FALSE;
err:

  if (!write_error)
  {
    write_error= 1;
    sql_print_error(ER(ER_ERROR_ON_WRITE), name, errno);
  }
  return TRUE;
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}

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/*
  Log a query to the traditional slow log file

  SYNOPSIS
    write()

    thd               THD of the query
    current_time      current timestamp
    query_start_arg   command start timestamp
    user_host         the pointer to the string with user@host info
    user_host_len     length of the user_host string. this is computed once
                      and passed to all general log event handlers
    query_time        Amount of time the query took to execute (in seconds)
    lock_time         Amount of time the query was locked (in seconds)
    is_command        The flag, which determines, whether the sql_text is a
                      query or an administrator command.
    sql_text          the very text of the query or administrator command
                      processed
    sql_text_len      the length of sql_text string

  DESCRIPTION

   Log a query to the slow log file.

  RETURN
    FALSE - OK
    TRUE - error occured
*/

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bool MYSQL_QUERY_LOG::write(THD *thd, time_t current_time,
                            time_t query_start_arg, const char *user_host,
                            uint user_host_len, longlong query_time,
                            longlong lock_time, bool is_command,
                            const char *sql_text, uint sql_text_len)
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{
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  bool error= 0;
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  DBUG_ENTER("MYSQL_QUERY_LOG::write");
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  if (!is_open())
    DBUG_RETURN(0);

  if (is_open())
  {						// Safety agains reopen
    int tmp_errno= 0;
    char buff[80], *end;
    uint buff_len;
    end= buff;

    if (!(specialflag & SPECIAL_SHORT_LOG_FORMAT))
    {
      Security_context *sctx= thd->security_ctx;
      if (current_time != last_time)
      {
        last_time= current_time;
        struct tm start;
        localtime_r(&current_time, &start);

        buff_len= my_snprintf(buff, sizeof buff,
                              "# Time: %02d%02d%02d %2d:%02d:%02d\n",
                              start.tm_year % 100, start.tm_mon + 1,
                              start.tm_mday, start.tm_hour,
                              start.tm_min, start.tm_sec);

        /* Note that my_b_write() assumes it knows the length for this */
        if (my_b_write(&log_file, (byte*) buff, buff_len))
          tmp_errno= errno;
      }
      if (my_b_printf(&log_file, "# User@Host: ", sizeof("# User@Host: ") - 1)
          != sizeof("# User@Host: ") - 1)
        tmp_errno= errno;
      if (my_b_printf(&log_file, user_host, user_host_len) != user_host_len)
        tmp_errno= errno;
      if (my_b_write(&log_file, (byte*) "\n", 1))
        tmp_errno= errno;
    }
    /* For slow query log */
    if (my_b_printf(&log_file,
                    "# Query_time: %lu  Lock_time: %lu"
                    " Rows_sent: %lu  Rows_examined: %lu\n",
                    (ulong) query_time, (ulong) lock_time,
                    (ulong) thd->sent_row_count,
                    (ulong) thd->examined_row_count) == (uint) -1)
      tmp_errno= errno;
    if (thd->db && strcmp(thd->db, db))
    {						// Database changed
      if (my_b_printf(&log_file,"use %s;\n",thd->db) == (uint) -1)
        tmp_errno= errno;
      strmov(db,thd->db);
    }
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    if (thd->stmt_depends_on_first_successful_insert_id_in_prev_stmt)
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    {
      end=strmov(end, ",last_insert_id=");
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      end=longlong10_to_str((longlong)
                            thd->first_successful_insert_id_in_prev_stmt_for_binlog,
                            end, -10);
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    }
    // Save value if we do an insert.
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    if (thd->auto_inc_intervals_in_cur_stmt_for_binlog.nb_elements() > 0)
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    {
      if (!(specialflag & SPECIAL_SHORT_LOG_FORMAT))
      {
        end=strmov(end,",insert_id=");
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        end=longlong10_to_str((longlong)
                              thd->auto_inc_intervals_in_cur_stmt_for_binlog.minimum(),
                              end, -10);
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      }
    }

    /*
      This info used to show up randomly, depending on whether the query
      checked the query start time or not. now we always write current
      timestamp to the slow log
    */
    end= strmov(end, ",timestamp=");
    end= int10_to_str((long) current_time, end, 10);

    if (end != buff)
    {
      *end++=';';
      *end='\n';
      if (my_b_write(&log_file, (byte*) "SET ", 4) ||
          my_b_write(&log_file, (byte*) buff + 1, (uint) (end-buff)))
        tmp_errno= errno;
    }
    if (is_command)
    {
      end= strxmov(buff, "# administrator command: ", NullS);
      buff_len= (ulong) (end - buff);
      my_b_write(&log_file, (byte*) buff, buff_len);
    }
    if (my_b_write(&log_file, (byte*) sql_text, sql_text_len) ||
        my_b_write(&log_file, (byte*) ";\n",2) ||
        flush_io_cache(&log_file))
      tmp_errno= errno;
    if (tmp_errno)
    {
      error= 1;
      if (! write_error)
      {
        write_error= 1;
        sql_print_error(ER(ER_ERROR_ON_WRITE), name, error);
      }
    }
  }
  DBUG_RETURN(error);
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}

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const char *MYSQL_LOG::generate_name(const char *log_name,
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                                      const char *suffix,
                                      bool strip_ext, char *buff)
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{
  if (!log_name || !log_name[0])
  {
    /*
      TODO: The following should be using fn_format();  We just need to
      first change fn_format() to cut the file name if it's too long.
    */
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    strmake(buff, glob_hostname, FN_REFLEN - 5);
    strmov(fn_ext(buff), suffix);
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    return (const char *)buff;
  }
  // get rid of extension if the log is binary to avoid problems
  if (strip_ext)
  {
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    char *p= fn_ext(log_name);
    uint length= (uint) (p - log_name);
    strmake(buff, log_name, min(length, FN_REFLEN));
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    return (const char*)buff;
  }
  return log_name;
}

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2020

2021

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MYSQL_BIN_LOG::MYSQL_BIN_LOG()
  :bytes_written(0), prepared_xids(0), file_id(1), open_count(1),
   need_start_event(TRUE), m_table_map_version(0),
   description_event_for_exec(0), description_event_for_queue(0)
{
  /*
    We don't want to initialize locks here as such initialization depends on
    safe_mutex (when using safe_mutex) which depends on MY_INIT(), which is
    called only in main(). Doing initialization here would make it happen
    before main().
  */
  index_file_name[0] = 0;
  bzero((char*) &index_file, sizeof(index_file));
}

/* this is called only once */

void MYSQL_BIN_LOG::cleanup()
{
  DBUG_ENTER("cleanup");
  if (inited)
  {
    inited= 0;
    close(LOG_CLOSE_INDEX|LOG_CLOSE_STOP_EVENT);
    delete description_event_for_queue;
    delete description_event_for_exec;
    (void) pthread_mutex_destroy(&LOCK_log);
    (void) pthread_mutex_destroy(&LOCK_index);
    (void) pthread_cond_destroy(&update_cond);
  }
  DBUG_VOID_RETURN;
}


/* Init binlog-specific vars */
void MYSQL_BIN_LOG::init(bool no_auto_events_arg, ulong max_size_arg)
{
  DBUG_ENTER("MYSQL_BIN_LOG::init");
  no_auto_events= no_auto_events_arg;
  max_size= max_size_arg;
  DBUG_PRINT("info",("max_size: %lu", max_size));
  DBUG_VOID_RETURN;
}


void MYSQL_BIN_LOG::init_pthread_objects()
{
  DBUG_ASSERT(inited == 0);
  inited= 1;
  (void) pthread_mutex_init(&LOCK_log, MY_MUTEX_INIT_SLOW);
  (void) pthread_mutex_init(&LOCK_index, MY_MUTEX_INIT_SLOW);
  (void) pthread_cond_init(&update_cond, 0);
}


bool MYSQL_BIN_LOG::open_index_file(const char *index_file_name_arg,
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                                const char *log_name)
{
  File index_file_nr= -1;
  DBUG_ASSERT(!my_b_inited(&index_file));

  /*
    First open of this class instance
    Create an index file that will hold all file names uses for logging.
    Add new entries to the end of it.
  */
  myf opt= MY_UNPACK_FILENAME;
  if (!index_file_name_arg)
  {
    index_file_name_arg= log_name;    // Use same basename for index file
    opt= MY_UNPACK_FILENAME | MY_REPLACE_EXT;
  }
  fn_format(index_file_name, index_file_name_arg, mysql_data_home,
            ".index", opt);
  if ((index_file_nr= my_open(index_file_name,
                              O_RDWR | O_CREAT | O_BINARY ,
                              MYF(MY_WME))) < 0 ||
       my_sync(index_file_nr, MYF(MY_WME)) ||
       init_io_cache(&index_file, index_file_nr,
                     IO_SIZE, WRITE_CACHE,
                     my_seek(index_file_nr,0L,MY_SEEK_END,MYF(0)),
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			0, MYF(MY_WME | MY_WAIT_IF_FULL)))
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  {
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    /*
      TODO: all operations creating/deleting the index file or a log, should
      call my_sync_dir() or my_sync_dir_by_file() to be durable.
      TODO: file creation should be done with my_create() not my_open().
    */
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    if (index_file_nr >= 0)
      my_close(index_file_nr,MYF(0));
    return TRUE;
  }
  return FALSE;
}

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/*
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  Open a (new) binlog file.
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  DESCRIPTION
2122
  - Open the log file and the index file. Register the new
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    file name in it
  - When calling this when the file is in use, you must have a locks
    on LOCK_log and LOCK_index.

  RETURN VALUES
    0	ok
    1	error
*/

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bool MYSQL_BIN_LOG::open(const char *log_name,
                         enum_log_type log_type_arg,
                         const char *new_name,
                         enum cache_type io_cache_type_arg,
                         bool no_auto_events_arg,
                         ulong max_size_arg,
                         bool null_created_arg)
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{
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  char buff[FN_REFLEN];
  File file= -1;
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  int open_flags = O_CREAT | O_BINARY;
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  DBUG_ENTER("MYSQL_BIN_LOG::open");
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  DBUG_PRINT("enter",("log_type: %d",(int) log_type_arg));
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  write_error=0;
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  /* open the main log file */
  if (MYSQL_LOG::open(log_name, log_type_arg, new_name, io_cache_type_arg))
    DBUG_RETURN(1);                            /* all warnings issued */
2151

2152
  init(no_auto_events_arg, max_size_arg);
2153

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  open_count++;
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2156
  DBUG_ASSERT(log_type == LOG_BIN);
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  {
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    bool write_file_name_to_index_file=0;

    if (!my_b_filelength(&log_file))
    {
      /*
	The binary log file was empty (probably newly created)
	This is the normal case and happens when the user doesn't specify
	an extension for the binary log files.
	In this case we write a standard header to it.
      */
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      if (my_b_safe_write(&log_file, (byte*) BINLOG_MAGIC,
			  BIN_LOG_HEADER_SIZE))
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        goto err;
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      bytes_written+= BIN_LOG_HEADER_SIZE;
      write_file_name_to_index_file= 1;
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    }
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    DBUG_ASSERT(my_b_inited(&index_file) != 0);
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    reinit_io_cache(&index_file, WRITE_CACHE,
                    my_b_filelength(&index_file), 0, 0);
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    if (need_start_event && !no_auto_events)
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    {
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      /*
        In 4.x we set need_start_event=0 here, but in 5.0 we want a Start event
        even if this is not the very first binlog.
      */
      Format_description_log_event s(BINLOG_VERSION);
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      /*
        don't set LOG_EVENT_BINLOG_IN_USE_F for SEQ_READ_APPEND io_cache
        as we won't be able to reset it later
      */
      if (io_cache_type == WRITE_CACHE)
        s.flags|= LOG_EVENT_BINLOG_IN_USE_F;
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      if (!s.is_valid())
        goto err;
      if (null_created_arg)
        s.created= 0;
      if (s.write(&log_file))
        goto err;
      bytes_written+= s.data_written;
    }
    if (description_event_for_queue &&
        description_event_for_queue->binlog_version>=4)
    {
      /*
        This is a relay log written to by the I/O slave thread.
        Write the event so that others can later know the format of this relay
        log.
        Note that this event is very close to the original event from the
        master (it has binlog version of the master, event types of the
        master), so this is suitable to parse the next relay log's event. It
        has been produced by
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        Format_description_log_event::Format_description_log_event(char* buf,).
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        Why don't we want to write the description_event_for_queue if this
        event is for format<4 (3.23 or 4.x): this is because in that case, the
        description_event_for_queue describes the data received from the
        master, but not the data written to the relay log (*conversion*),
        which is in format 4 (slave's).
      */
      /*
        Set 'created' to 0, so that in next relay logs this event does not
        trigger cleaning actions on the slave in
        Format_description_log_event::exec_event().
      */
      description_event_for_queue->created= 0;
      /* Don't set log_pos in event header */
      description_event_for_queue->artificial_event=1;
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      if (description_event_for_queue->write(&log_file))
        goto err;
      bytes_written+= description_event_for_queue->data_written;
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    }
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    if (flush_io_cache(&log_file) ||
        my_sync(log_file.file, MYF(MY_WME)))
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      goto err;
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    if (write_file_name_to_index_file)
    {
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      /*
        As this is a new log file, we write the file name to the index
        file. As every time we write to the index file, we sync it.
      */
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      if (my_b_write(&index_file, (byte*) log_file_name,
		     strlen(log_file_name)) ||
	  my_b_write(&index_file, (byte*) "\n", 1) ||
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	  flush_io_cache(&index_file) ||
          my_sync(index_file.file, MYF(MY_WME)))
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	goto err;
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    }
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  }
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  log_state= LOG_OPENED;

2251
  DBUG_RETURN(0);
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err:
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  sql_print_error("Could not use %s for logging (error %d). \
Turning logging off for the whole duration of the MySQL server process. \
To turn it on again: fix the cause, \
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shutdown the MySQL server and restart it.", name, errno);
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  if (file >= 0)
    my_close(file,MYF(0));
  end_io_cache(&log_file);
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  end_io_cache(&index_file);
  safeFree(name);
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  log_state= LOG_CLOSED;
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  DBUG_RETURN(1);
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}

2267

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int MYSQL_BIN_LOG::get_current_log(LOG_INFO* linfo)
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{
  pthread_mutex_lock(&LOCK_log);
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  int ret = raw_get_current_log(linfo);
  pthread_mutex_unlock(&LOCK_log);
  return ret;
}

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int MYSQL_BIN_LOG::raw_get_current_log(LOG_INFO* linfo)
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{
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  strmake(linfo->log_file_name, log_file_name, sizeof(linfo->log_file_name)-1);
  linfo->pos = my_b_tell(&log_file);
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  return 0;
}

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/*
  Move all data up in a file in an filename index file

  SYNOPSIS
    copy_up_file_and_fill()
    index_file			File to move
    offset			Move everything from here to beginning

  NOTE
    File will be truncated to be 'offset' shorter or filled up with
    newlines

  IMPLEMENTATION
    We do the copy outside of the IO_CACHE as the cache buffers would just
    make things slower and more complicated.
    In most cases the copy loop should only do one read.

  RETURN VALUES
    0	ok
*/

static bool copy_up_file_and_fill(IO_CACHE *index_file, my_off_t offset)
{
  int bytes_read;
  my_off_t init_offset= offset;
  File file= index_file->file;
  byte io_buf[IO_SIZE*2];
  DBUG_ENTER("copy_up_file_and_fill");

  for (;; offset+= bytes_read)
  {
    (void) my_seek(file, offset, MY_SEEK_SET, MYF(0));
    if ((bytes_read= (int) my_read(file, io_buf, sizeof(io_buf), MYF(MY_WME)))
	< 0)
      goto err;
    if (!bytes_read)
      break;					// end of file
    (void) my_seek(file, offset-init_offset, MY_SEEK_SET, MYF(0));
    if (my_write(file, (byte*) io_buf, bytes_read, MYF(MY_WME | MY_NABP)))
      goto err;
  }
  /* The following will either truncate the file or fill the end with \n' */
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  if (my_chsize(file, offset - init_offset, '\n', MYF(MY_WME)) ||
      my_sync(file, MYF(MY_WME)))
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    goto err;

  /* Reset data in old index cache */
  reinit_io_cache(index_file, READ_CACHE, (my_off_t) 0, 0, 1);
  DBUG_RETURN(0);

err:
  DBUG_RETURN(1);
}


/*
  Find the position in the log-index-file for the given log name

  SYNOPSIS
    find_log_pos()
    linfo		Store here the found log file name and position to
			the NEXT log file name in the index file.
    log_name		Filename to find in the index file.
			Is a null pointer if we want to read the first entry
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    need_lock		Set this to 1 if the parent doesn't already have a
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			lock on LOCK_index

  NOTE
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    On systems without the truncate function the file will end with one or
    more empty lines.  These will be ignored when reading the file.
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  RETURN VALUES
    0			ok
    LOG_INFO_EOF	End of log-index-file found
    LOG_INFO_IO		Got IO error while reading file
*/

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int MYSQL_BIN_LOG::find_log_pos(LOG_INFO *linfo, const char *log_name,
2361
			    bool need_lock)
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{
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  int error= 0;
  char *fname= linfo->log_file_name;
  uint log_name_len= log_name ? (uint) strlen(log_name) : 0;
  DBUG_ENTER("find_log_pos");
  DBUG_PRINT("enter",("log_name: %s", log_name ? log_name : "NULL"));
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  /*
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    Mutex needed because we need to make sure the file pointer does not
    move from under our feet
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  */
2373
  if (need_lock)
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    pthread_mutex_lock(&LOCK_index);
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  safe_mutex_assert_owner(&LOCK_index);

  /* As the file is flushed, we can't get an error here */
  (void) reinit_io_cache(&index_file, READ_CACHE, (my_off_t) 0, 0, 0);

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  for (;;)
2381
  {
2382
    uint length;
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    my_off_t offset= my_b_tell(&index_file);
    /* If we get 0 or 1 characters, this is the end of the file */

    if ((length= my_b_gets(&index_file, fname, FN_REFLEN)) <= 1)
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    {
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      /* Did not find the given entry; Return not found or error */
      error= !index_file.error ? LOG_INFO_EOF : LOG_INFO_IO;
      break;
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    }

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    // if the log entry matches, null string matching anything
    if (!log_name ||
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	(log_name_len == length-1 && fname[log_name_len] == '\n' &&
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	 !memcmp(fname, log_name, log_name_len)))
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    {
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      DBUG_PRINT("info",("Found log file entry"));
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      fname[length-1]=0;			// remove last \n
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      linfo->index_file_start_offset= offset;
      linfo->index_file_offset = my_b_tell(&index_file);
2402
      break;
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    }
2404
  }
2405

2406
  if (need_lock)
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    pthread_mutex_unlock(&LOCK_index);
2408
  DBUG_RETURN(error);
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}
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/*
  Find the position in the log-index-file for the given log name

  SYNOPSIS
    find_next_log()
    linfo		Store here the next log file name and position to
			the file name after that.
    need_lock		Set this to 1 if the parent doesn't already have a
			lock on LOCK_index

  NOTE
    - Before calling this function, one has to call find_log_pos()
      to set up 'linfo'
    - Mutex needed because we need to make sure the file pointer does not move
      from under our feet

  RETURN VALUES
    0			ok
    LOG_INFO_EOF	End of log-index-file found
    LOG_INFO_IO		Got IO error while reading file
*/

2434
int MYSQL_BIN_LOG::find_next_log(LOG_INFO* linfo, bool need_lock)
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{
2436
  int error= 0;
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  uint length;
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  char *fname= linfo->log_file_name;

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  if (need_lock)
    pthread_mutex_lock(&LOCK_index);
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  safe_mutex_assert_owner(&LOCK_index);

  /* As the file is flushed, we can't get an error here */
  (void) reinit_io_cache(&index_file, READ_CACHE, linfo->index_file_offset, 0,
			 0);

  linfo->index_file_start_offset= linfo->index_file_offset;
  if ((length=my_b_gets(&index_file, fname, FN_REFLEN)) <= 1)
2450
  {
2451
    error = !index_file.error ? LOG_INFO_EOF : LOG_INFO_IO;
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    goto err;
  }
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  fname[length-1]=0;				// kill \n
2455
  linfo->index_file_offset = my_b_tell(&index_file);
2456

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err:
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  if (need_lock)
    pthread_mutex_unlock(&LOCK_index);
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  return error;
}

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/*
  Delete all logs refered to in the index file
  Start writing to a new log file.  The new index file will only contain
  this file.

  SYNOPSIS
     reset_logs()
     thd		Thread

  NOTE
    If not called from slave thread, write start event to new log


  RETURN VALUES
    0	ok
    1   error
*/

2482
bool MYSQL_BIN_LOG::reset_logs(THD* thd)
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{
  LOG_INFO linfo;
2485
  bool error=0;
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  const char* save_name;
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  DBUG_ENTER("reset_logs");
2488

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  ha_reset_logs(thd);
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  /*
    We need to get both locks to be sure that no one is trying to
    write to the index log file.
  */
2494
  pthread_mutex_lock(&LOCK_log);
2495
  pthread_mutex_lock(&LOCK_index);
2496

2497 2498 2499 2500 2501 2502 2503
  /*
    The following mutex is needed to ensure that no threads call
    'delete thd' as we would then risk missing a 'rollback' from this
    thread. If the transaction involved MyISAM tables, it should go
    into binlog even on rollback.
  */
  (void) pthread_mutex_lock(&LOCK_thread_count);
2504 2505 2506 2507

  /* Save variables so that we can reopen the log */
  save_name=name;
  name=0;					// Protect against free
2508
  close(LOG_CLOSE_TO_BE_OPENED);
2509 2510 2511 2512

  /* First delete all old log files */

  if (find_log_pos(&linfo, NullS, 0))
2513 2514 2515 2516
  {
    error=1;
    goto err;
  }
2517

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2518
  for (;;)
2519
  {
2520
    my_delete_allow_opened(linfo.log_file_name, MYF(MY_WME));
2521
    if (find_next_log(&linfo, 0))
2522 2523
      break;
  }
2524 2525

  /* Start logging with a new file */
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2526
  close(LOG_CLOSE_INDEX);
2527
  my_delete_allow_opened(index_file_name, MYF(MY_WME));	// Reset (open will update)
2528
  if (!thd->slave_thread)
2529
    need_start_event=1;
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2530
  if (!open_index_file(index_file_name, 0))
2531
    open(save_name, log_type, 0, io_cache_type, no_auto_events, max_size, 0);
2532
  my_free((gptr) save_name, MYF(0));
2533

2534
err:
2535
  (void) pthread_mutex_unlock(&LOCK_thread_count);
2536
  pthread_mutex_unlock(&LOCK_index);
2537
  pthread_mutex_unlock(&LOCK_log);
2538
  DBUG_RETURN(error);
2539 2540
}

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2541

2542
/*
2543 2544 2545
  Delete relay log files prior to rli->group_relay_log_name
  (i.e. all logs which are not involved in a non-finished group
  (transaction)), remove them from the index file and start on next relay log.
2546 2547 2548

  SYNOPSIS
    purge_first_log()
2549 2550 2551 2552 2553
    rli		 Relay log information
    included     If false, all relay logs that are strictly before
                 rli->group_relay_log_name are deleted ; if true, the latter is
                 deleted too (i.e. all relay logs
                 read by the SQL slave thread are deleted).
2554

2555 2556
  NOTE
    - This is only called from the slave-execute thread when it has read
2557 2558 2559 2560 2561
      all commands from a relay log and want to switch to a new relay log.
    - When this happens, we can be in an active transaction as
      a transaction can span over two relay logs
      (although it is always written as a single block to the master's binary 
      log, hence cannot span over two master's binary logs).
2562 2563 2564

  IMPLEMENTATION
    - Protects index file with LOCK_index
2565 2566
    - Delete relevant relay log files
    - Copy all file names after these ones to the front of the index file
2567
    - If the OS has truncate, truncate the file, else fill it with \n'
2568
    - Read the next file name from the index file and store in rli->linfo
2569 2570

  RETURN VALUES
2571 2572 2573 2574
    0			ok
    LOG_INFO_EOF	End of log-index-file found
    LOG_INFO_SEEK	Could not allocate IO cache
    LOG_INFO_IO		Got IO error while reading file
2575 2576
*/

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2577
#ifdef HAVE_REPLICATION
2578

2579
int MYSQL_BIN_LOG::purge_first_log(struct st_relay_log_info* rli, bool included) 
2580
{
2581
  int error;
2582 2583
  DBUG_ENTER("purge_first_log");

2584 2585
  DBUG_ASSERT(is_open());
  DBUG_ASSERT(rli->slave_running == 1);
2586
  DBUG_ASSERT(!strcmp(rli->linfo.log_file_name,rli->event_relay_log_name));
2587

2588
  pthread_mutex_lock(&LOCK_index);
2589 2590 2591 2592 2593 2594
  pthread_mutex_lock(&rli->log_space_lock);
  rli->relay_log.purge_logs(rli->group_relay_log_name, included,
                            0, 0, &rli->log_space_total);
  // Tell the I/O thread to take the relay_log_space_limit into account
  rli->ignore_log_space_limit= 0;
  pthread_mutex_unlock(&rli->log_space_lock);
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2595 2596

  /*
2597 2598 2599
    Ok to broadcast after the critical region as there is no risk of
    the mutex being destroyed by this thread later - this helps save
    context switches
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2600
  */
2601 2602 2603 2604 2605
  pthread_cond_broadcast(&rli->log_space_cond);
  
  /*
    Read the next log file name from the index file and pass it back to
    the caller
2606 2607
    If included is true, we want the first relay log;
    otherwise we want the one after event_relay_log_name.
2608
  */
2609 2610 2611 2612
  if ((included && (error=find_log_pos(&rli->linfo, NullS, 0))) ||
      (!included &&
       ((error=find_log_pos(&rli->linfo, rli->event_relay_log_name, 0)) ||
        (error=find_next_log(&rli->linfo, 0)))))
2613 2614
  {
    char buff[22];
2615 2616 2617 2618 2619
    sql_print_error("next log error: %d  offset: %s  log: %s included: %d",
                    error,
                    llstr(rli->linfo.index_file_offset,buff),
                    rli->group_relay_log_name,
                    included);
2620 2621
    goto err;
  }
2622

2623
  /*
2624
    Reset rli's coordinates to the current log.
2625
  */
2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639
  rli->event_relay_log_pos= BIN_LOG_HEADER_SIZE;
  strmake(rli->event_relay_log_name,rli->linfo.log_file_name,
	  sizeof(rli->event_relay_log_name)-1);

  /*
    If we removed the rli->group_relay_log_name file,
    we must update the rli->group* coordinates, otherwise do not touch it as the
    group's execution is not finished (e.g. COMMIT not executed)
  */
  if (included)
  {
    rli->group_relay_log_pos = BIN_LOG_HEADER_SIZE;
    strmake(rli->group_relay_log_name,rli->linfo.log_file_name,
            sizeof(rli->group_relay_log_name)-1);
2640
    rli->notify_group_relay_log_name_update();
2641
  }
2642 2643 2644

  /* Store where we are in the new file for the execution thread */
  flush_relay_log_info(rli);
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2645

2646
err:
2647
  pthread_mutex_unlock(&LOCK_index);
2648
  DBUG_RETURN(error);
2649 2650
}

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2651 2652 2653 2654
/*
  Update log index_file
*/

2655
int MYSQL_BIN_LOG::update_log_index(LOG_INFO* log_info, bool need_update_threads)
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2656 2657 2658 2659 2660
{
  if (copy_up_file_and_fill(&index_file, log_info->index_file_start_offset))
    return LOG_INFO_IO;

  // now update offsets in index file for running threads
2661 2662
  if (need_update_threads)
    adjust_linfo_offsets(log_info->index_file_start_offset);
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2663 2664
  return 0;
}
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2665

2666 2667 2668 2669 2670
/*
  Remove all logs before the given log from disk and from the index file.

  SYNOPSIS
    purge_logs()
2671 2672 2673 2674 2675 2676 2677
    to_log	        Delete all log file name before this file. 
    included            If true, to_log is deleted too.
    need_mutex
    need_update_threads If we want to update the log coordinates of
                        all threads. False for relay logs, true otherwise.
    freed_log_space     If not null, decrement this variable of
                        the amount of log space freed
2678 2679 2680 2681 2682 2683 2684 2685 2686 2687

  NOTES
    If any of the logs before the deleted one is in use,
    only purge logs up to this one.

  RETURN VALUES
    0				ok
    LOG_INFO_EOF		to_log not found
*/

2688
int MYSQL_BIN_LOG::purge_logs(const char *to_log, 
2689 2690 2691 2692
                          bool included,
                          bool need_mutex, 
                          bool need_update_threads, 
                          ulonglong *decrease_log_space)
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2693 2694
{
  int error;
2695
  bool exit_loop= 0;
2696 2697
  LOG_INFO log_info;
  DBUG_ENTER("purge_logs");
2698
  DBUG_PRINT("info",("to_log= %s",to_log));
2699

2700 2701
  if (need_mutex)
    pthread_mutex_lock(&LOCK_index);
2702
  if ((error=find_log_pos(&log_info, to_log, 0 /*no mutex*/)))
2703 2704
    goto err;

2705
  /*
2706
    File name exists in index file; delete until we find this file
2707 2708 2709
    or a file that is used.
  */
  if ((error=find_log_pos(&log_info, NullS, 0 /*no mutex*/)))
2710
    goto err;
2711 2712
  while ((strcmp(to_log,log_info.log_file_name) || (exit_loop=included)) &&
         !log_in_use(log_info.log_file_name))
2713
  {
2714
    ulong file_size= 0;
2715 2716 2717
    if (decrease_log_space) //stat the file we want to delete
    {
      MY_STAT s;
2718 2719 2720 2721 2722 2723

      /* 
         If we could not stat, we can't know the amount
         of space that deletion will free. In most cases,
         deletion won't work either, so it's not a problem.
      */
2724
      if (my_stat(log_info.log_file_name,&s,MYF(0)))
2725
        file_size= s.st_size;
2726
      else
2727 2728
	sql_print_information("Failed to execute my_stat on file '%s'",
			      log_info.log_file_name);
2729 2730 2731 2732 2733 2734 2735
    }
    /*
      It's not fatal if we can't delete a log file ;
      if we could delete it, take its size into account
    */
    DBUG_PRINT("info",("purging %s",log_info.log_file_name));
    if (!my_delete(log_info.log_file_name, MYF(0)) && decrease_log_space)
2736
      *decrease_log_space-= file_size;
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2737 2738 2739

    ha_binlog_index_purge_file(current_thd, log_info.log_file_name);

2740
    if (find_next_log(&log_info, 0) || exit_loop)
2741
      break;
2742
  }
2743

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2744 2745 2746 2747
  /*
    If we get killed -9 here, the sysadmin would have to edit
    the log index file after restart - otherwise, this should be safe
  */
2748
  error= update_log_index(&log_info, need_update_threads);
2749

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2750
err:
2751 2752
  if (need_mutex)
    pthread_mutex_unlock(&LOCK_index);
2753
  DBUG_RETURN(error);
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2754 2755
}

2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773
/*
  Remove all logs before the given file date from disk and from the
  index file.

  SYNOPSIS
    purge_logs_before_date()
    thd		Thread pointer
    before_date	Delete all log files before given date.

  NOTES
    If any of the logs before the deleted one is in use,
    only purge logs up to this one.

  RETURN VALUES
    0				ok
    LOG_INFO_PURGE_NO_ROTATE	Binary file that can't be rotated
*/

2774
int MYSQL_BIN_LOG::purge_logs_before_date(time_t purge_time)
2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789
{
  int error;
  LOG_INFO log_info;
  MY_STAT stat_area;

  DBUG_ENTER("purge_logs_before_date");

  pthread_mutex_lock(&LOCK_index);

  /*
    Delete until we find curren file
    or a file that is used or a file
    that is older than purge_time.
  */
  if ((error=find_log_pos(&log_info, NullS, 0 /*no mutex*/)))
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2790
    goto err;
2791 2792 2793 2794 2795

  while (strcmp(log_file_name, log_info.log_file_name) &&
	 !log_in_use(log_info.log_file_name))
  {
    /* It's not fatal even if we can't delete a log file */
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2796 2797
    if (!my_stat(log_info.log_file_name, &stat_area, MYF(0)) ||
	stat_area.st_mtime >= purge_time)
2798
      break;
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2799
    my_delete(log_info.log_file_name, MYF(0));
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2800 2801 2802

    ha_binlog_index_purge_file(current_thd, log_info.log_file_name);

2803 2804
    if (find_next_log(&log_info, 0))
      break;
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2805
  }
2806

2807 2808 2809 2810
  /*
    If we get killed -9 here, the sysadmin would have to edit
    the log index file after restart - otherwise, this should be safe
  */
2811
  error= update_log_index(&log_info, 1);
2812

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2813 2814
err:
  pthread_mutex_unlock(&LOCK_index);
2815
  DBUG_RETURN(error);
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2816 2817
}

2818

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2819
#endif /* HAVE_REPLICATION */
2820

2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832

/*
  Create a new log file name

  SYNOPSIS
    make_log_name()
    buf			buf of at least FN_REFLEN where new name is stored

  NOTE
    If file name will be longer then FN_REFLEN it will be truncated
*/

2833
void MYSQL_BIN_LOG::make_log_name(char* buf, const char* log_ident)
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2834
{
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2835 2836 2837 2838 2839
  uint dir_len = dirname_length(log_file_name); 
  if (dir_len > FN_REFLEN)
    dir_len=FN_REFLEN-1;
  strnmov(buf, log_file_name, dir_len);
  strmake(buf+dir_len, log_ident, FN_REFLEN - dir_len);
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2840 2841
}

2842 2843 2844 2845 2846

/*
  Check if we are writing/reading to the given log file
*/

2847
bool MYSQL_BIN_LOG::is_active(const char *log_file_name_arg)
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2848
{
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2849
  return !strcmp(log_file_name, log_file_name_arg);
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2850 2851
}

2852

2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872
/*
  Wrappers around new_file_impl to avoid using argument
  to control locking. The argument 1) less readable 2) breaks
  incapsulation 3) allows external access to the class without
  a lock (which is not possible with private new_file_without_locking
  method).
*/

void MYSQL_BIN_LOG::new_file()
{
  new_file_impl(1);
}


void MYSQL_BIN_LOG::new_file_without_locking()
{
  new_file_impl(0);
}


2873 2874 2875 2876
/*
  Start writing to a new log file or reopen the old file

  SYNOPSIS
2877
    new_file_impl()
2878
    need_lock		Set to 1 if caller has not locked LOCK_log
2879 2880 2881 2882 2883

  NOTE
    The new file name is stored last in the index file
*/

2884
void MYSQL_BIN_LOG::new_file_impl(bool need_lock)
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2885
{
2886 2887
  char new_name[FN_REFLEN], *new_name_ptr, *old_name;

2888
  DBUG_ENTER("MYSQL_BIN_LOG::new_file_impl");
2889
  if (!is_open())
2890 2891 2892 2893
  {
    DBUG_PRINT("info",("log is closed"));
    DBUG_VOID_RETURN;
  }
2894 2895 2896

  if (need_lock)
    pthread_mutex_lock(&LOCK_log);
2897 2898
  pthread_mutex_lock(&LOCK_index);

2899 2900 2901
  safe_mutex_assert_owner(&LOCK_log);
  safe_mutex_assert_owner(&LOCK_index);

2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919
  /*
    if binlog is used as tc log, be sure all xids are "unlogged",
    so that on recover we only need to scan one - latest - binlog file
    for prepared xids. As this is expected to be a rare event,
    simple wait strategy is enough. We're locking LOCK_log to be sure no
    new Xid_log_event's are added to the log (and prepared_xids is not
    increased), and waiting on COND_prep_xids for late threads to
    catch up.
  */
  if (prepared_xids)
  {
    tc_log_page_waits++;
    pthread_mutex_lock(&LOCK_prep_xids);
    while (prepared_xids)
      pthread_cond_wait(&COND_prep_xids, &LOCK_prep_xids);
    pthread_mutex_unlock(&LOCK_prep_xids);
  }

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2920
  /* Reuse old name if not binlog and not update log */
2921
  new_name_ptr= name;
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2922

2923
  /*
2924 2925 2926
    If user hasn't specified an extension, generate a new log name
    We have to do this here and not in open as we want to store the
    new file name in the current binary log file.
2927
  */
2928 2929 2930
  if (generate_new_name(new_name, name))
    goto end;
  new_name_ptr=new_name;
2931

2932
  if (log_type == LOG_BIN)
2933
  {
2934
    if (!no_auto_events)
unknown's avatar
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2935
    {
2936
      /*
2937 2938
        We log the whole file name for log file as the user may decide
        to change base names at some point.
2939
      */
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2940
      THD *thd = current_thd; /* may be 0 if we are reacting to SIGHUP */
2941
      Rotate_log_event r(new_name+dirname_length(new_name),
2942
                         0, LOG_EVENT_OFFSET, 0);
2943
      r.write(&log_file);
2944
      bytes_written += r.data_written;
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2945
    }
2946 2947 2948 2949 2950
    /*
      Update needs to be signalled even if there is no rotate event
      log rotation should give the waiting thread a signal to
      discover EOF and move on to the next log.
    */
2951
    signal_update();
2952 2953 2954
  }
  old_name=name;
  name=0;				// Don't free name
2955
  close(LOG_CLOSE_TO_BE_OPENED);
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2956

2957
  /*
2958
     Note that at this point, log_state != LOG_CLOSED (important for is_open()).
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2959
  */
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2960

2961
  /*
2962
     new_file() is only used for rotation (in FLUSH LOGS or because size >
2963
     max_binlog_size or max_relay_log_size).
2964 2965 2966 2967
     If this is a binary log, the Format_description_log_event at the beginning of
     the new file should have created=0 (to distinguish with the
     Format_description_log_event written at server startup, which should
     trigger temp tables deletion on slaves.
2968
  */
2969

2970
  open(old_name, log_type, new_name_ptr,
2971
       io_cache_type, no_auto_events, max_size, 1);
2972 2973
  my_free(old_name,MYF(0));

2974
end:
2975 2976
  if (need_lock)
    pthread_mutex_unlock(&LOCK_log);
2977 2978
  pthread_mutex_unlock(&LOCK_index);

2979
  DBUG_VOID_RETURN;
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2980 2981
}

2982

2983
bool MYSQL_BIN_LOG::append(Log_event* ev)
2984 2985 2986
{
  bool error = 0;
  pthread_mutex_lock(&LOCK_log);
2987
  DBUG_ENTER("MYSQL_BIN_LOG::append");
2988

2989
  DBUG_ASSERT(log_file.type == SEQ_READ_APPEND);
2990 2991 2992 2993
  /*
    Log_event::write() is smart enough to use my_b_write() or
    my_b_append() depending on the kind of cache we have.
  */
2994 2995 2996 2997 2998
  if (ev->write(&log_file))
  {
    error=1;
    goto err;
  }
2999
  bytes_written+= ev->data_written;
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3000
  DBUG_PRINT("info",("max_size: %lu",max_size));
3001
  if ((uint) my_b_append_tell(&log_file) > max_size)
3002
    new_file_without_locking();
3003

3004
err:
3005
  pthread_mutex_unlock(&LOCK_log);
3006
  signal_update();				// Safe as we don't call close
3007
  DBUG_RETURN(error);
3008 3009
}

3010

3011
bool MYSQL_BIN_LOG::appendv(const char* buf, uint len,...)
3012
{
3013
  bool error= 0;
3014
  DBUG_ENTER("MYSQL_BIN_LOG::appendv");
3015 3016
  va_list(args);
  va_start(args,len);
3017

3018
  DBUG_ASSERT(log_file.type == SEQ_READ_APPEND);
3019

3020
  safe_mutex_assert_owner(&LOCK_log);
3021 3022
  do
  {
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3023
    if (my_b_append(&log_file,(byte*) buf,len))
3024
    {
3025 3026
      error= 1;
      goto err;
3027
    }
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3028
    bytes_written += len;
3029
  } while ((buf=va_arg(args,const char*)) && (len=va_arg(args,uint)));
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3030
  DBUG_PRINT("info",("max_size: %lu",max_size));
3031
  if ((uint) my_b_append_tell(&log_file) > max_size)
3032
    new_file_without_locking();
3033 3034

err:
3035 3036
  if (!error)
    signal_update();
3037
  DBUG_RETURN(error);
3038
}
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3039

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3040

3041
bool MYSQL_BIN_LOG::flush_and_sync()
3042
{
3043 3044 3045 3046 3047
  int err=0, fd=log_file.file;
  safe_mutex_assert_owner(&LOCK_log);
  if (flush_io_cache(&log_file))
    return 1;
  if (++sync_binlog_counter >= sync_binlog_period && sync_binlog_period)
3048 3049
  {
    sync_binlog_counter= 0;
3050
    err=my_sync(fd, MYF(MY_WME));
3051
  }
3052
  return err;
3053 3054
}

3055
void MYSQL_BIN_LOG::start_union_events(THD *thd)
3056 3057 3058 3059 3060
{
  DBUG_ASSERT(!thd->binlog_evt_union.do_union);
  thd->binlog_evt_union.do_union= TRUE;
  thd->binlog_evt_union.unioned_events= FALSE;
  thd->binlog_evt_union.unioned_events_trans= FALSE;
3061
  thd->binlog_evt_union.first_query_id= thd->query_id;
3062 3063
}

3064
void MYSQL_BIN_LOG::stop_union_events(THD *thd)
3065 3066 3067 3068 3069
{
  DBUG_ASSERT(thd->binlog_evt_union.do_union);
  thd->binlog_evt_union.do_union= FALSE;
}

3070
bool MYSQL_BIN_LOG::is_query_in_union(THD *thd, query_id_t query_id_param)
3071 3072 3073 3074 3075
{
  return (thd->binlog_evt_union.do_union && 
          query_id_param >= thd->binlog_evt_union.first_query_id);
}

3076 3077 3078 3079 3080 3081 3082 3083 3084 3085

/*
  These functions are placed in this file since they need access to
  binlog_hton, which has internal linkage.
*/

int THD::binlog_setup_trx_data()
{
  DBUG_ENTER("THD::binlog_setup_trx_data");
  binlog_trx_data *trx_data=
3086
    (binlog_trx_data*) ha_data[binlog_hton->slot];
3087 3088 3089 3090

  if (trx_data)
    DBUG_RETURN(0);                             // Already set up

3091
  ha_data[binlog_hton->slot]= trx_data=
3092 3093 3094 3095 3096 3097
    (binlog_trx_data*) my_malloc(sizeof(binlog_trx_data), MYF(MY_ZEROFILL));
  if (!trx_data ||
      open_cached_file(&trx_data->trans_log, mysql_tmpdir,
                       LOG_PREFIX, binlog_cache_size, MYF(MY_WME)))
  {
    my_free((gptr)trx_data, MYF(MY_ALLOW_ZERO_PTR));
3098
    ha_data[binlog_hton->slot]= 0;
3099 3100 3101 3102 3103 3104
    DBUG_RETURN(1);                      // Didn't manage to set it up
  }
  trx_data->trans_log.end_of_file= max_binlog_cache_size;
  DBUG_RETURN(0);
}

3105 3106 3107 3108 3109 3110 3111
/*
  Write a table map to the binary log.

  This function is called from ha_external_lock() after the storage
  engine has registered for the transaction.
 */

3112
#ifdef HAVE_ROW_BASED_REPLICATION
3113 3114
int THD::binlog_write_table_map(TABLE *table, bool is_trans)
{
3115
  int error;
3116
  DBUG_ENTER("THD::binlog_write_table_map");
3117 3118 3119
  DBUG_PRINT("enter", ("table: %0xlx  (%s: #%u)",
                       (long) table, table->s->table_name,
                       table->s->table_map_id));
3120 3121

  /* Pre-conditions */
3122
  DBUG_ASSERT(current_stmt_binlog_row_based && mysql_bin_log.is_open());
3123 3124 3125 3126 3127 3128 3129 3130 3131
  DBUG_ASSERT(table->s->table_map_id != ULONG_MAX);

  Table_map_log_event::flag_set const
    flags= Table_map_log_event::TM_NO_FLAGS;

  Table_map_log_event
    the_event(this, table, table->s->table_map_id, is_trans, flags);

  if (is_trans)
3132 3133
    trans_register_ha(this,
                      (options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)) != 0,
3134
                      binlog_hton);
3135

3136
  if ((error= mysql_bin_log.write(&the_event)))
3137 3138
    DBUG_RETURN(error);

3139
  binlog_table_maps++;
3140 3141 3142 3143
  table->s->table_map_version= mysql_bin_log.table_map_version();
  DBUG_RETURN(0);
}

3144 3145 3146 3147
Rows_log_event*
THD::binlog_get_pending_rows_event() const
{
  binlog_trx_data *const trx_data=
3148
    (binlog_trx_data*) ha_data[binlog_hton->slot];
3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160
  /*
    This is less than ideal, but here's the story: If there is no
    trx_data, prepare_pending_rows_event() has never been called
    (since the trx_data is set up there). In that case, we just return
    NULL.
   */
  return trx_data ? trx_data->pending : NULL;
}

void
THD::binlog_set_pending_rows_event(Rows_log_event* ev)
{
3161
  if (ha_data[binlog_hton->slot] == NULL)
3162 3163
    binlog_setup_trx_data();

3164
  binlog_trx_data *const trx_data=
3165
    (binlog_trx_data*) ha_data[binlog_hton->slot];
3166

3167 3168 3169 3170 3171 3172 3173 3174 3175 3176
  DBUG_ASSERT(trx_data);
  trx_data->pending= ev;
}


/*
  Moves the last bunch of rows from the pending Rows event to the binlog
  (either cached binlog if transaction, or disk binlog). Sets a new pending
  event.
*/
3177 3178
int MYSQL_BIN_LOG::
  flush_and_set_pending_rows_event(THD *thd, Rows_log_event* event)
3179
{
3180
  DBUG_ENTER("MYSQL_BIN_LOG::flush_and_set_pending_rows_event(event)");
3181
  DBUG_ASSERT(mysql_bin_log.is_open());
3182 3183 3184 3185 3186
  DBUG_PRINT("enter", ("event=%p", event));

  int error= 0;

  binlog_trx_data *const trx_data=
3187
    (binlog_trx_data*) thd->ha_data[binlog_hton->slot];
3188 3189 3190

  DBUG_ASSERT(trx_data);

3191 3192
  DBUG_PRINT("info", ("trx_data->pending=%p", trx_data->pending));

3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253
  if (Rows_log_event* pending= trx_data->pending)
  {
    IO_CACHE *file= &log_file;

    /*
      Decide if we should write to the log file directly or to the
      transaction log.
    */
    if (pending->get_cache_stmt() || my_b_tell(&trx_data->trans_log))
      file= &trx_data->trans_log;

    /*
      If we are writing to the log file directly, we could avoid
      locking the log. This does not work since we need to step the
      m_table_map_version below, and that change has to be protected
      by the LOCK_log mutex.
    */
    pthread_mutex_lock(&LOCK_log);

    /*
      Write pending event to log file or transaction cache
    */
    if (pending->write(file))
    {
      pthread_mutex_unlock(&LOCK_log);
      DBUG_RETURN(1);
    }

    /*
      We step the table map version if we are writing an event
      representing the end of a statement.  We do this regardless of
      wheather we write to the transaction cache or to directly to the
      file.

      In an ideal world, we could avoid stepping the table map version
      if we were writing to a transaction cache, since we could then
      reuse the table map that was written earlier in the transaction
      cache.  This does not work since STMT_END_F implies closing all
      table mappings on the slave side.

      TODO: Find a solution so that table maps does not have to be
      written several times within a transaction.
     */
    if (pending->get_flags(Rows_log_event::STMT_END_F))
      ++m_table_map_version;

    delete pending;

    if (file == &log_file)
    {
      error= flush_and_sync();
      if (!error)
      {
        signal_update();
        rotate_and_purge(RP_LOCK_LOG_IS_ALREADY_LOCKED);
      }
    }

    pthread_mutex_unlock(&LOCK_log);
  }

3254
  thd->binlog_set_pending_rows_event(event);
3255 3256 3257

  DBUG_RETURN(error);
}
3258
#endif /*HAVE_ROW_BASED_REPLICATION*/
3259

3260 3261 3262 3263
/*
  Write an event to the binary log
*/

3264
bool MYSQL_BIN_LOG::write(Log_event *event_info)
unknown's avatar
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3265
{
3266 3267
  THD *thd= event_info->thd;
  bool error= 1;
3268
  DBUG_ENTER("MYSQL_BIN_LOG::write(Log_event *)");
3269

3270 3271
  if (thd->binlog_evt_union.do_union)
  {
3272 3273 3274 3275
    /*
      In Stored function; Remember that function call caused an update.
      We will log the function call to the binary log on function exit
    */
3276 3277 3278 3279
    thd->binlog_evt_union.unioned_events= TRUE;
    thd->binlog_evt_union.unioned_events_trans |= event_info->cache_stmt;
    DBUG_RETURN(0);
  }
3280 3281 3282 3283 3284 3285 3286

  /*
    Flush the pending rows event to the transaction cache or to the
    log file.  Since this function potentially aquire the LOCK_log
    mutex, we do this before aquiring the LOCK_log mutex in this
    function.

3287 3288 3289
    We only end the statement if we are in a top-level statement.  If
    we are inside a stored function, we do not end the statement since
    this will close all tables on the slave.
3290
  */
3291
#ifdef HAVE_ROW_BASED_REPLICATION
3292 3293 3294
  bool const end_stmt=
    thd->prelocked_mode && thd->lex->requires_prelocking();
  thd->binlog_flush_pending_rows_event(end_stmt);
3295
#endif /*HAVE_ROW_BASED_REPLICATION*/
3296

3297 3298
  pthread_mutex_lock(&LOCK_log);

3299
  /*
unknown's avatar
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3300 3301 3302 3303
     In most cases this is only called if 'is_open()' is true; in fact this is
     mostly called if is_open() *was* true a few instructions before, but it
     could have changed since.
  */
3304
  if (likely(is_open()))
unknown's avatar
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3305
  {
unknown's avatar
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3306 3307
    const char *local_db= event_info->get_db();
    IO_CACHE *file= &log_file;
unknown's avatar
SCRUM  
unknown committed
3308
#ifdef HAVE_REPLICATION
3309
    /*
unknown's avatar
unknown committed
3310 3311 3312 3313
       In the future we need to add to the following if tests like
       "do the involved tables match (to be implemented)
        binlog_[wild_]{do|ignore}_table?" (WL#1049)"
    */
3314
    if ((thd && !(thd->options & OPTION_BIN_LOG)) ||
unknown's avatar
Merge  
unknown committed
3315
	(!binlog_filter->db_ok(local_db)))
unknown's avatar
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3316
    {
3317
      VOID(pthread_mutex_unlock(&LOCK_log));
3318 3319 3320
      DBUG_PRINT("info",("OPTION_BIN_LOG is %s, db_ok('%s') == %d",
                         (thd->options & OPTION_BIN_LOG) ? "set" : "clear",
                         local_db, binlog_filter->db_ok(local_db)));
3321
      DBUG_RETURN(0);
3322
    }
unknown's avatar
SCRUM  
unknown committed
3323
#endif /* HAVE_REPLICATION */
3324

3325
#if defined(USING_TRANSACTIONS) && defined(HAVE_ROW_BASED_REPLICATION)
3326 3327 3328 3329 3330 3331 3332
    /*
      Should we write to the binlog cache or to the binlog on disk?
      Write to the binlog cache if:
      - it is already not empty (meaning we're in a transaction; note that the
     present event could be about a non-transactional table, but still we need
     to write to the binlog cache in that case to handle updates to mixed
     trans/non-trans table types the best possible in binlogging)
unknown's avatar
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3333
      - or if the event asks for it (cache_stmt == TRUE).
3334 3335 3336
    */
    if (opt_using_transactions && thd)
    {
3337 3338
      if (thd->binlog_setup_trx_data())
        goto err;
3339

3340
      binlog_trx_data *const trx_data=
3341
        (binlog_trx_data*) thd->ha_data[binlog_hton->slot];
3342
      IO_CACHE *trans_log= &trx_data->trans_log;
3343 3344
      bool trans_log_in_use= my_b_tell(trans_log) != 0;
      if (event_info->get_cache_stmt() && !trans_log_in_use)
3345
        trans_register_ha(thd,
3346
                          (thd->options &
3347
                           (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)) != 0,
3348
                          binlog_hton);
3349 3350 3351
      if (event_info->get_cache_stmt() || trans_log_in_use)
      {
        DBUG_PRINT("info", ("Using trans_log"));
3352
        file= trans_log;
3353
      }
3354
      /*
3355
        TODO as Mats suggested, for all the cases above where we write to
3356 3357
        trans_log, it sounds unnecessary to lock LOCK_log. We should rather
        test first if we want to write to trans_log, and if not, lock
3358
        LOCK_log.
3359
      */
3360
    }
3361
#endif /* USING_TRANSACTIONS && HAVE_ROW_BASED_REPLICATION */
3362
    DBUG_PRINT("info",("event type: %d",event_info->get_type_code()));
3363

unknown's avatar
unknown committed
3364 3365 3366 3367
    /*
      No check for auto events flag here - this write method should
      never be called if auto-events are enabled
    */
unknown's avatar
unknown committed
3368 3369

    /*
3370 3371
      1. Write first log events which describe the 'run environment'
      of the SQL command
unknown's avatar
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3372 3373
    */

3374 3375 3376 3377
    /*
      If row-based binlogging, Insert_id, Rand and other kind of "setting
      context" events are not needed.
    */
3378
    if (thd)
3379
    {
3380
      if (!thd->current_stmt_binlog_row_based)
3381
      {
3382
        if (thd->stmt_depends_on_first_successful_insert_id_in_prev_stmt)
3383 3384
        {
          Intvar_log_event e(thd,(uchar) LAST_INSERT_ID_EVENT,
3385
                             thd->first_successful_insert_id_in_prev_stmt_for_binlog);
3386 3387 3388
          if (e.write(file))
            goto err;
        }
3389
        if (thd->auto_inc_intervals_in_cur_stmt_for_binlog.nb_elements() > 0)
3390
        {
3391 3392
          DBUG_PRINT("info",("number of auto_inc intervals: %lu",
                             thd->auto_inc_intervals_in_cur_stmt_for_binlog.nb_elements()));
3393 3394 3395 3396 3397
          /*
            If the auto_increment was second in a table's index (possible with
            MyISAM or BDB) (table->next_number_key_offset != 0), such event is
            in fact not necessary. We could avoid logging it.
          */
3398 3399
          Intvar_log_event e(thd,(uchar) INSERT_ID_EVENT,
                             thd->auto_inc_intervals_in_cur_stmt_for_binlog.minimum());
3400 3401 3402 3403 3404 3405 3406 3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424
          if (e.write(file))
            goto err;
        }
        if (thd->rand_used)
        {
          Rand_log_event e(thd,thd->rand_saved_seed1,thd->rand_saved_seed2);
          if (e.write(file))
            goto err;
        }
        if (thd->user_var_events.elements)
        {
          for (uint i= 0; i < thd->user_var_events.elements; i++)
          {
            BINLOG_USER_VAR_EVENT *user_var_event;
            get_dynamic(&thd->user_var_events,(gptr) &user_var_event, i);
            User_var_log_event e(thd, user_var_event->user_var_event->name.str,
                                 user_var_event->user_var_event->name.length,
                                 user_var_event->value,
                                 user_var_event->length,
                                 user_var_event->type,
                                 user_var_event->charset_number);
            if (e.write(file))
              goto err;
          }
        }
unknown's avatar
unknown committed
3425
      }
3426
    }
unknown's avatar
unknown committed
3427

3428 3429
    /*
       Write the SQL command
3430
     */
unknown's avatar
unknown committed
3431

unknown's avatar
unknown committed
3432
    if (event_info->write(file))
3433
      goto err;
unknown's avatar
unknown committed
3434

3435
    if (file == &log_file) // we are writing to the real log (disk)
unknown's avatar
unknown committed
3436
    {
3437
      if (flush_and_sync())
unknown's avatar
unknown committed
3438
	goto err;
3439 3440
      signal_update();
      rotate_and_purge(RP_LOCK_LOG_IS_ALREADY_LOCKED);
3441
    }
unknown's avatar
unknown committed
3442
    error=0;
3443

3444 3445 3446 3447
err:
    if (error)
    {
      if (my_errno == EFBIG)
unknown's avatar
unknown committed
3448
	my_message(ER_TRANS_CACHE_FULL, ER(ER_TRANS_CACHE_FULL), MYF(0));
3449 3450 3451 3452 3453
      else
	my_error(ER_ERROR_ON_WRITE, MYF(0), name, errno);
      write_error=1;
    }
  }
3454

3455 3456 3457
  if (event_info->flags & LOG_EVENT_UPDATE_TABLE_MAP_VERSION_F)
    ++m_table_map_version;

3458
  pthread_mutex_unlock(&LOCK_log);
3459
  DBUG_RETURN(error);
3460 3461
}

3462 3463 3464 3465 3466 3467 3468 3469 3470 3471 3472 3473 3474 3475 3476 3477 3478 3479 3480 3481 3482 3483 3484 3485 3486 3487 3488 3489

int error_log_print(enum loglevel level, const char *format,
                    va_list args)
{
  return logger.error_log_print(level, format, args);
}


bool slow_log_print(THD *thd, const char *query, uint query_length,
                    time_t query_start_arg)
{
  return logger.slow_log_print(thd, query, query_length, query_start_arg);
}


bool general_log_print(THD *thd, enum enum_server_command command,
                       const char *format, ...)
{
  va_list args;
  uint error= 0;

  va_start(args, format);
  error= logger.general_log_print(thd, command, format, args);
  va_end(args);

  return error;
}

3490
void MYSQL_BIN_LOG::rotate_and_purge(uint flags)
3491
{
3492 3493
  if (!(flags & RP_LOCK_LOG_IS_ALREADY_LOCKED))
    pthread_mutex_lock(&LOCK_log);
3494 3495
  if ((flags & RP_FORCE_ROTATE) ||
      (my_b_tell(&log_file) >= (my_off_t) max_size))
3496
  {
3497
    new_file_without_locking();
3498 3499 3500 3501 3502 3503 3504 3505 3506
#ifdef HAVE_REPLICATION
    if (expire_logs_days)
    {
      long purge_time= time(0) - expire_logs_days*24*60*60;
      if (purge_time >= 0)
        purge_logs_before_date(purge_time);
    }
#endif
  }
3507 3508
  if (!(flags & RP_LOCK_LOG_IS_ALREADY_LOCKED))
    pthread_mutex_unlock(&LOCK_log);
3509
}
3510

3511
uint MYSQL_BIN_LOG::next_file_id()
unknown's avatar
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3512 3513 3514 3515 3516 3517 3518 3519
{
  uint res;
  pthread_mutex_lock(&LOCK_log);
  res = file_id++;
  pthread_mutex_unlock(&LOCK_log);
  return res;
}

3520

3521 3522
/*
  Write a cached log entry to the binary log
3523

unknown's avatar
unknown committed
3524 3525
  SYNOPSIS
    write()
3526
    thd
unknown's avatar
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3527 3528
    cache		The cache to copy to the binlog

3529 3530
  NOTE
    - We only come here if there is something in the cache.
unknown's avatar
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3531
    - The thing in the cache is always a complete transaction
3532 3533 3534 3535
    - 'cache' needs to be reinitialized after this functions returns.

  IMPLEMENTATION
    - To support transaction over replication, we wrap the transaction
unknown's avatar
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3536
      with BEGIN/COMMIT or BEGIN/ROLLBACK in the binary log.
3537 3538 3539
      We want to write a BEGIN/ROLLBACK block when a non-transactional table
      was updated in a transaction which was rolled back. This is to ensure
      that the same updates are run on the slave.
3540 3541
*/

3542
bool MYSQL_BIN_LOG::write(THD *thd, IO_CACHE *cache, Log_event *commit_event)
3543
{
3544
  DBUG_ENTER("MYSQL_BIN_LOG::write(THD *, IO_CACHE *, Log_event *)");
3545
  VOID(pthread_mutex_lock(&LOCK_log));
3546

3547 3548 3549
  /* NULL would represent nothing to replicate after ROLLBACK */
  DBUG_ASSERT(commit_event != NULL);

3550
  if (likely(is_open()))                       // Should always be true
3551
  {
3552 3553
    uint length;

unknown's avatar
unknown committed
3554
    /*
3555 3556
      Log "BEGIN" at the beginning of the transaction.
      which may contain more than 1 SQL statement.
3557
    */
3558
    if (thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN))
3559
    {
3560
      Query_log_event qinfo(thd, STRING_WITH_LEN("BEGIN"), TRUE, FALSE);
3561 3562 3563 3564
      /*
        Imagine this is rollback due to net timeout, after all statements of
        the transaction succeeded. Then we want a zero-error code in BEGIN.
        In other words, if there was a really serious error code it's already
3565 3566 3567
        in the statement's events, there is no need to put it also in this
        internally generated event, and as this event is generated late it
        would lead to false alarms.
3568 3569 3570
        This is safer than thd->clear_error() against kills at shutdown.
      */
      qinfo.error_code= 0;
3571 3572 3573
      /*
        Now this Query_log_event has artificial log_pos 0. It must be adjusted
        to reflect the real position in the log. Not doing it would confuse the
3574 3575 3576
	slave: it would prevent this one from knowing where he is in the
	master's binlog, which would result in wrong positions being shown to
	the user, MASTER_POS_WAIT undue waiting etc.
3577
      */
3578 3579 3580
      if (qinfo.write(&log_file))
	goto err;
    }
unknown's avatar
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3581
    /* Read from the file used to cache the queries .*/
unknown's avatar
unknown committed
3582
    if (reinit_io_cache(cache, READ_CACHE, 0, 0, 0))
3583
      goto err;
3584
    length=my_b_bytes_in_cache(cache);
3585
    DBUG_EXECUTE_IF("half_binlogged_transaction", length-=100;);
3586
    do
3587
    {
unknown's avatar
unknown committed
3588
      /* Write data to the binary log file */
unknown's avatar
unknown committed
3589
      if (my_b_write(&log_file, cache->read_pos, length))
3590
	goto err;
unknown's avatar
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3591
      cache->read_pos=cache->read_end;		// Mark buffer used up
3592
      DBUG_EXECUTE_IF("half_binlogged_transaction", goto DBUG_skip_commit;);
3593
    } while ((length=my_b_fill(cache)));
3594

3595 3596
    if (commit_event->write(&log_file))
      goto err;
3597
#ifndef DBUG_OFF
3598
DBUG_skip_commit:
3599
#endif
3600
    if (flush_and_sync())
3601
      goto err;
3602
    DBUG_EXECUTE_IF("half_binlogged_transaction", abort(););
3603 3604
    if (cache->error)				// Error on read
    {
unknown's avatar
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3605
      sql_print_error(ER(ER_ERROR_ON_READ), cache->file_name, errno);
3606
      write_error=1;				// Don't give more errors
3607
      goto err;
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3608
    }
3609
    signal_update();
3610 3611 3612 3613 3614 3615 3616 3617 3618
    /*
      if commit_event is Xid_log_event, increase the number of
      prepared_xids (it's decreasd in ::unlog()). Binlog cannot be rotated
      if there're prepared xids in it - see the comment in new_file() for
      an explanation.
      If the commit_event is not Xid_log_event (then it's a Query_log_event)
      rotate binlog, if necessary.
    */
    if (commit_event->get_type_code() == XID_EVENT)
3619 3620 3621 3622 3623
    {
      pthread_mutex_lock(&LOCK_prep_xids);
      prepared_xids++;
      pthread_mutex_unlock(&LOCK_prep_xids);
    }
3624 3625
    else
      rotate_and_purge(RP_LOCK_LOG_IS_ALREADY_LOCKED);
unknown's avatar
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3626
  }
3627
  VOID(pthread_mutex_unlock(&LOCK_log));
unknown's avatar
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3628

3629
  DBUG_RETURN(0);
3630 3631

err:
3632 3633 3634 3635 3636
  if (!write_error)
  {
    write_error= 1;
    sql_print_error(ER(ER_ERROR_ON_WRITE), name, errno);
  }
3637
  VOID(pthread_mutex_unlock(&LOCK_log));
3638
  DBUG_RETURN(1);
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3639 3640
}

3641

3642 3643 3644 3645 3646 3647
/*
  Wait until we get a signal that the binary log has been updated

  SYNOPSIS
    wait_for_update()
    thd			Thread variable
3648
    is_slave            If 0, the caller is the Binlog_dump thread from master;
3649 3650
                        if 1, the caller is the SQL thread from the slave. This
                        influences only thd->proc_info.
3651 3652 3653

  NOTES
    One must have a lock on LOCK_log before calling this function.
3654
    This lock will be released before return! That's required by
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    THD::enter_cond() (see NOTES in sql_class.h).
3656 3657
*/

3658
void MYSQL_BIN_LOG::wait_for_update(THD* thd, bool is_slave)
3659
{
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3660 3661
  const char *old_msg;
  DBUG_ENTER("wait_for_update");
3662

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  old_msg= thd->enter_cond(&update_cond, &LOCK_log,
3664
                           is_slave ?
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                           "Has read all relay log; waiting for the slave I/O "
3666
                           "thread to update it" :
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                           "Has sent all binlog to slave; waiting for binlog "
3668
                           "to be updated");
3669 3670
  pthread_cond_wait(&update_cond, &LOCK_log);
  thd->exit_cond(old_msg);
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  DBUG_VOID_RETURN;
3672
}
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3673

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3674

3675 3676 3677 3678 3679
/*
  Close the log file

  SYNOPSIS
    close()
3680 3681 3682 3683 3684
    exiting     Bitmask for one or more of the following bits:
                LOG_CLOSE_INDEX if we should close the index file
                LOG_CLOSE_TO_BE_OPENED if we intend to call open
                at once after close.
                LOG_CLOSE_STOP_EVENT write a 'stop' event to the log
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3685 3686 3687 3688

  NOTES
    One can do an open on the object at once after doing a close.
    The internal structures are not freed until cleanup() is called
3689 3690
*/

3691
void MYSQL_BIN_LOG::close(uint exiting)
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3692
{					// One can't set log_type here!
3693
  DBUG_ENTER("MYSQL_BIN_LOG::close");
3694
  DBUG_PRINT("enter",("exiting: %d", (int) exiting));
3695
  if (log_state == LOG_OPENED)
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  {
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#ifdef HAVE_REPLICATION
3698 3699
    if (log_type == LOG_BIN && !no_auto_events &&
	(exiting & LOG_CLOSE_STOP_EVENT))
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3700 3701
    {
      Stop_log_event s;
3702
      s.write(&log_file);
3703
      bytes_written+= s.data_written;
3704
      signal_update();
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    }
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#endif /* HAVE_REPLICATION */
3707 3708

    /* don't pwrite in a file opened with O_APPEND - it doesn't work */
3709
    if (log_file.type == WRITE_CACHE && log_type == LOG_BIN)
3710 3711
    {
      my_off_t offset= BIN_LOG_HEADER_SIZE + FLAGS_OFFSET;
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      byte flags=0; // clearing LOG_EVENT_BINLOG_IN_USE_F
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      my_pwrite(log_file.file, &flags, 1, offset, MYF(0));
3714 3715
    }

3716 3717
    /* this will cleanup IO_CACHE, sync and close the file */
    MYSQL_LOG::close(exiting);
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  }
3719 3720 3721 3722 3723 3724

  /*
    The following test is needed even if is_open() is not set, as we may have
    called a not complete close earlier and the index file is still open.
  */

3725
  if ((exiting & LOG_CLOSE_INDEX) && my_b_inited(&index_file))
3726
  {
3727 3728
    end_io_cache(&index_file);
    if (my_close(index_file.file, MYF(0)) < 0 && ! write_error)
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    {
3730 3731
      write_error= 1;
      sql_print_error(ER(ER_ERROR_ON_WRITE), index_file_name, errno);
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    }
3733
  }
3734
  log_state= (exiting & LOG_CLOSE_TO_BE_OPENED) ? LOG_TO_BE_OPENED : LOG_CLOSED;
3735
  safeFree(name);
3736
  DBUG_VOID_RETURN;
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3737 3738 3739
}


3740
void MYSQL_BIN_LOG::set_max_size(ulong max_size_arg)
3741 3742 3743 3744 3745 3746 3747 3748
{
  /*
    We need to take locks, otherwise this may happen:
    new_file() is called, calls open(old_max_size), then before open() starts,
    set_max_size() sets max_size to max_size_arg, then open() starts and
    uses the old_max_size argument, so max_size_arg has been overwritten and
    it's like if the SET command was never run.
  */
3749
  DBUG_ENTER("MYSQL_BIN_LOG::set_max_size");
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3750
  pthread_mutex_lock(&LOCK_log);
3751 3752
  if (is_open())
    max_size= max_size_arg;
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3753 3754
  pthread_mutex_unlock(&LOCK_log);
  DBUG_VOID_RETURN;
3755
}
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3756

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3757

3758 3759
/*
  Check if a string is a valid number
3760 3761 3762 3763 3764 3765 3766 3767 3768 3769 3770 3771 3772 3773

  SYNOPSIS
    test_if_number()
    str			String to test
    res			Store value here
    allow_wildcards	Set to 1 if we should ignore '%' and '_'

  NOTE
    For the moment the allow_wildcards argument is not used
    Should be move to some other file.

  RETURN VALUES
    1	String is a number
    0	Error
3774
*/
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3775 3776 3777 3778 3779 3780 3781 3782 3783 3784 3785 3786

static bool test_if_number(register const char *str,
			   long *res, bool allow_wildcards)
{
  reg2 int flag;
  const char *start;
  DBUG_ENTER("test_if_number");

  flag=0; start=str;
  while (*str++ == ' ') ;
  if (*--str == '-' || *str == '+')
    str++;
3787 3788
  while (my_isdigit(files_charset_info,*str) ||
	 (allow_wildcards && (*str == wild_many || *str == wild_one)))
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3789 3790 3791 3792 3793 3794 3795
  {
    flag=1;
    str++;
  }
  if (*str == '.')
  {
    for (str++ ;
3796
	 my_isdigit(files_charset_info,*str) ||
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3797 3798 3799 3800 3801 3802 3803 3804 3805 3806 3807
	   (allow_wildcards && (*str == wild_many || *str == wild_one)) ;
	 str++, flag=1) ;
  }
  if (*str != 0 || flag == 0)
    DBUG_RETURN(0);
  if (res)
    *res=atol(start);
  DBUG_RETURN(1);			/* Number ok */
} /* test_if_number */


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3808
void print_buffer_to_file(enum loglevel level, const char *buffer)
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3809 3810 3811 3812
{
  time_t skr;
  struct tm tm_tmp;
  struct tm *start;
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3813 3814
  DBUG_ENTER("print_buffer_to_file");
  DBUG_PRINT("enter",("buffer: %s", buffer));
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3815 3816

  VOID(pthread_mutex_lock(&LOCK_error_log));
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3817

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3818
  skr=time(NULL);
3819
  localtime_r(&skr, &tm_tmp);
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3820
  start=&tm_tmp;
3821

3822
  fprintf(stderr, "%02d%02d%02d %2d:%02d:%02d [%s] %s\n",
3823 3824 3825 3826 3827 3828
          start->tm_year % 100,
          start->tm_mon+1,
          start->tm_mday,
          start->tm_hour,
          start->tm_min,
          start->tm_sec,
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          (level == ERROR_LEVEL ? "ERROR" : level == WARNING_LEVEL ?
3830
           "Warning" : "Note"),
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3831
          buffer);
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3832

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3833 3834 3835 3836 3837 3838 3839 3840 3841 3842 3843 3844 3845 3846 3847
  fflush(stderr);

  VOID(pthread_mutex_unlock(&LOCK_error_log));
  DBUG_VOID_RETURN;
}


void sql_perror(const char *message)
{
#ifdef HAVE_STRERROR
  sql_print_error("%s: %s",message, strerror(errno));
#else
  perror(message);
#endif
}
3848

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3849

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3850 3851 3852
bool flush_error_log()
{
  bool result=0;
3853
  if (opt_error_log)
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3854 3855 3856 3857
  {
    char err_renamed[FN_REFLEN], *end;
    end= strmake(err_renamed,log_error_file,FN_REFLEN-4);
    strmov(end, "-old");
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    VOID(pthread_mutex_lock(&LOCK_error_log));
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3859 3860 3861 3862 3863 3864
#ifdef __WIN__
    char err_temp[FN_REFLEN+4];
    /*
     On Windows is necessary a temporary file for to rename
     the current error file.
    */
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3865
    strxmov(err_temp, err_renamed,"-tmp",NullS);
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3866 3867 3868 3869 3870 3871 3872 3873 3874 3875 3876 3877 3878
    (void) my_delete(err_temp, MYF(0)); 
    if (freopen(err_temp,"a+",stdout))
    {
      freopen(err_temp,"a+",stderr);
      (void) my_delete(err_renamed, MYF(0));
      my_rename(log_error_file,err_renamed,MYF(0));
      if (freopen(log_error_file,"a+",stdout))
        freopen(log_error_file,"a+",stderr);
      int fd, bytes;
      char buf[IO_SIZE];
      if ((fd = my_open(err_temp, O_RDONLY, MYF(0))) >= 0)
      {
        while ((bytes = (int) my_read(fd, (byte*) buf, IO_SIZE, MYF(0))) > 0)
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3879
             my_fwrite(stderr, (byte*) buf, bytes, MYF(0));
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        my_close(fd, MYF(0));
      }
      (void) my_delete(err_temp, MYF(0)); 
    }
    else
     result= 1;
#else
   my_rename(log_error_file,err_renamed,MYF(0));
   if (freopen(log_error_file,"a+",stdout))
     freopen(log_error_file,"a+",stderr);
   else
     result= 1;
#endif
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3893
    VOID(pthread_mutex_unlock(&LOCK_error_log));
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3894 3895 3896
  }
   return result;
}
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3897

3898
void MYSQL_BIN_LOG::signal_update()
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3899
{
3900
  DBUG_ENTER("MYSQL_BIN_LOG::signal_update");
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3901 3902 3903 3904
  pthread_cond_broadcast(&update_cond);
  DBUG_VOID_RETURN;
}

3905
#ifdef __NT__
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3906 3907
void print_buffer_to_nt_eventlog(enum loglevel level, char *buff,
                                 uint length, int buffLen)
3908 3909 3910 3911
{
  HANDLE event;
  char   *buffptr;
  LPCSTR *buffmsgptr;
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3912
  DBUG_ENTER("print_buffer_to_nt_eventlog");
3913

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3914
  buffptr= buff;
3915
  if (length > (uint)(buffLen-5))
3916
  {
3917
    char *newBuff= new char[length + 5];
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3918
    strcpy(newBuff, buff);
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3919
    buffptr= newBuff;
3920
  }
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3921 3922
  strmov(buffptr+length, "\r\n\r\n");
  buffmsgptr= (LPCSTR*) &buffptr;               // Keep windows happy
3923

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3924 3925
  setup_windows_event_source();
  if ((event= RegisterEventSource(NULL,"MySQL")))
3926
  {
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3927
    switch (level) {
3928
      case ERROR_LEVEL:
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3929 3930
        ReportEvent(event, EVENTLOG_ERROR_TYPE, 0, MSG_DEFAULT, NULL, 1, 0,
                    buffmsgptr, NULL);
3931 3932
        break;
      case WARNING_LEVEL:
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3933 3934
        ReportEvent(event, EVENTLOG_WARNING_TYPE, 0, MSG_DEFAULT, NULL, 1, 0,
                    buffmsgptr, NULL);
3935 3936
        break;
      case INFORMATION_LEVEL:
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3937 3938
        ReportEvent(event, EVENTLOG_INFORMATION_TYPE, 0, MSG_DEFAULT, NULL, 1,
                    0, buffmsgptr, NULL);
3939 3940 3941 3942 3943
        break;
    }
    DeregisterEventSource(event);
  }

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3944
  /* if we created a string buffer, then delete it */
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3945
  if (buffptr != buff)
3946 3947 3948 3949
    delete[] buffptr;

  DBUG_VOID_RETURN;
}
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3950 3951
#endif /* __NT__ */

3952 3953

/*
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3954 3955
  Prints a printf style message to the error log and, under NT, to the
  Windows event log.
3956 3957 3958

  SYNOPSIS
    vprint_msg_to_log()
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3959 3960
    event_type             Type of event to write (Error, Warning, or Info)
    format                 Printf style format of message
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3961
    args                   va_list list of arguments for the message
3962 3963 3964 3965

  NOTE

  IMPLEMENTATION
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3966 3967
    This function prints the message into a buffer and then sends that buffer
    to other functions to write that message to other logging sources.
3968 3969

  RETURN VALUES
3970 3971 3972
    The function always returns 0. The return value is present in the
    signature to be compatible with other logging routines, which could
    return an error (e.g. logging to the log tables)
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3973
*/
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3974

3975
#ifdef EMBEDDED_LIBRARY
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3976
int vprint_msg_to_log(enum loglevel level __attribute__((unused)),
3977 3978
                       const char *format __attribute__((unused)),
                       va_list argsi __attribute__((unused)))
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3979 3980 3981 3982
{
  DBUG_ENTER("vprint_msg_to_log");
  DBUG_RETURN(0);
}
3983
#else /*!EMBEDDED_LIBRARY*/
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3984
int vprint_msg_to_log(enum loglevel level, const char *format, va_list args)
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3985 3986
{
  char   buff[1024];
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3987
  uint length;
3988
  DBUG_ENTER("vprint_msg_to_log");
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3989

3990 3991
  /* "- 5" is because of print_buffer_to_nt_eventlog() */
  length= my_vsnprintf(buff, sizeof(buff) - 5, format, args);
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3992
  print_buffer_to_file(level, buff);
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3993 3994

#ifdef __NT__
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3995
  print_buffer_to_nt_eventlog(level, buff, length, sizeof(buff));
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3996
#endif
3997

3998
  DBUG_RETURN(0);
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3999
}
4000
#endif /*EMBEDDED_LIBRARY*/
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4001

4002

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4003
void sql_print_error(const char *format, ...) 
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4004 4005
{
  va_list args;
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4006
  DBUG_ENTER("sql_print_error");
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4007

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4008
  va_start(args, format);
4009
  error_log_print(ERROR_LEVEL, format, args);
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4010
  va_end(args);
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4011 4012 4013 4014 4015

  DBUG_VOID_RETURN;
}


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4016
void sql_print_warning(const char *format, ...) 
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4017 4018
{
  va_list args;
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4019
  DBUG_ENTER("sql_print_warning");
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4020

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4021
  va_start(args, format);
4022
  error_log_print(WARNING_LEVEL, format, args);
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4023
  va_end(args);
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4024 4025 4026 4027 4028

  DBUG_VOID_RETURN;
}


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4029
void sql_print_information(const char *format, ...) 
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4030 4031
{
  va_list args;
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4032
  DBUG_ENTER("sql_print_information");
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4033

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4034
  va_start(args, format);
4035
  error_log_print(INFORMATION_LEVEL, format, args);
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4036
  va_end(args);
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4037

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4038 4039
  DBUG_VOID_RETURN;
}
4040

4041

4042 4043 4044 4045 4046 4047 4048 4049
/********* transaction coordinator log for 2pc - mmap() based solution *******/

/*
  the log consists of a file, mmapped to a memory.
  file is divided on pages of tc_log_page_size size.
  (usable size of the first page is smaller because of log header)
  there's PAGE control structure for each page
  each page (or rather PAGE control structure) can be in one of three
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4050 4051
  states - active, syncing, pool.
  there could be only one page in active or syncing states,
4052
  but many in pool - pool is fifo queue.
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4053
  usual lifecycle of a page is pool->active->syncing->pool
4054
  "active" page - is a page where new xid's are logged.
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4055 4056
  the page stays active as long as syncing slot is taken.
  "syncing" page is being synced to disk. no new xid can be added to it.
4057
  when the sync is done the page is moved to a pool and an active page
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4058 4059 4060 4061 4062 4063 4064 4065 4066 4067 4068 4069 4070
  becomes "syncing".

  the result of such an architecture is a natural "commit grouping" -
  If commits are coming faster than the system can sync, they do not
  stall. Instead, all commit that came since the last sync are
  logged to the same page, and they all are synced with the next -
  one - sync. Thus, thought individual commits are delayed, throughput
  is not decreasing.

  when a xid is added to an active page, the thread of this xid waits
  for a page's condition until the page is synced. when syncing slot
  becomes vacant one of these waiters is awaken to take care of syncing.
  it syncs the page and signals all waiters that the page is synced.
4071 4072 4073 4074
  PAGE::waiters is used to count these waiters, and a page may never
  become active again until waiters==0 (that is all waiters from the
  previous sync have noticed the sync was completed)

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4075 4076
  note, that the page becomes "dirty" and has to be synced only when a
  new xid is added into it. Removing a xid from a page does not make it
4077 4078
  dirty - we don't sync removals to disk.
*/
4079 4080 4081 4082 4083

ulong tc_log_page_waits= 0;

#ifdef HAVE_MMAP

4084 4085
#define TC_LOG_HEADER_SIZE (sizeof(tc_log_magic)+1)

4086
static const char tc_log_magic[]={(char) 254, 0x23, 0x05, 0x74};
4087

4088
ulong opt_tc_log_size= TC_LOG_MIN_SIZE;
4089
ulong tc_log_max_pages_used=0, tc_log_page_size=0, tc_log_cur_pages_used=0;
4090 4091 4092 4093 4094 4095 4096

int TC_LOG_MMAP::open(const char *opt_name)
{
  uint i;
  bool crashed=FALSE;
  PAGE *pg;

4097
  DBUG_ASSERT(total_ha_2pc > 1);
4098 4099
  DBUG_ASSERT(opt_name && opt_name[0]);

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4100
  tc_log_page_size= my_getpagesize();
4101 4102 4103
  DBUG_ASSERT(TC_LOG_PAGE_SIZE % tc_log_page_size == 0);

  fn_format(logname,opt_name,mysql_data_home,"",MY_UNPACK_FILENAME);
4104
  if ((fd= my_open(logname, O_RDWR, MYF(0))) < 0)
4105
  {
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4106 4107
    if (my_errno != ENOENT)
      goto err;
4108 4109
    if (using_heuristic_recover())
      return 1;
4110
    if ((fd= my_create(logname, O_RDWR, 0, MYF(MY_WME))) < 0)
4111 4112
      goto err;
    inited=1;
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4113
    file_length= opt_tc_log_size;
4114 4115 4116 4117 4118
    if (my_chsize(fd, file_length, 0, MYF(MY_WME)))
      goto err;
  }
  else
  {
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4119 4120
    inited= 1;
    crashed= TRUE;
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4121
    sql_print_information("Recovering after a crash using %s", opt_name);
4122 4123 4124 4125 4126 4127
    if (tc_heuristic_recover)
    {
      sql_print_error("Cannot perform automatic crash recovery when "
                      "--tc-heuristic-recover is used");
      goto err;
    }
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    file_length= my_seek(fd, 0L, MY_SEEK_END, MYF(MY_WME+MY_FAE));
4129 4130 4131 4132
    if (file_length == MY_FILEPOS_ERROR || file_length % tc_log_page_size)
      goto err;
  }

4133
  data= (uchar *)my_mmap(0, (size_t)file_length, PROT_READ|PROT_WRITE,
4134 4135 4136 4137 4138 4139 4140 4141
                        MAP_NOSYNC|MAP_SHARED, fd, 0);
  if (data == MAP_FAILED)
  {
    my_errno=errno;
    goto err;
  }
  inited=2;

4142
  npages=(uint)file_length/tc_log_page_size;
4143 4144 4145 4146 4147 4148 4149 4150 4151 4152 4153 4154 4155 4156 4157 4158 4159
  DBUG_ASSERT(npages >= 3);             // to guarantee non-empty pool
  if (!(pages=(PAGE *)my_malloc(npages*sizeof(PAGE), MYF(MY_WME|MY_ZEROFILL))))
    goto err;
  inited=3;
  for (pg=pages, i=0; i < npages; i++, pg++)
  {
    pg->next=pg+1;
    pg->waiters=0;
    pg->state=POOL;
    pthread_mutex_init(&pg->lock, MY_MUTEX_INIT_FAST);
    pthread_cond_init (&pg->cond, 0);
    pg->start=(my_xid *)(data + i*tc_log_page_size);
    pg->end=(my_xid *)(pg->start + tc_log_page_size);
    pg->size=pg->free=tc_log_page_size/sizeof(my_xid);
  }
  pages[0].size=pages[0].free=
                (tc_log_page_size-TC_LOG_HEADER_SIZE)/sizeof(my_xid);
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  pages[0].start=pages[0].end-pages[0].size;
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  pages[npages-1].next=0;
  inited=4;

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  if (crashed && recover())
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      goto err;
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  memcpy(data, tc_log_magic, sizeof(tc_log_magic));
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  data[sizeof(tc_log_magic)]= (uchar)total_ha_2pc;
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  my_msync(fd, data, tc_log_page_size, MS_SYNC);
  inited=5;

  pthread_mutex_init(&LOCK_sync,    MY_MUTEX_INIT_FAST);
  pthread_mutex_init(&LOCK_active,  MY_MUTEX_INIT_FAST);
  pthread_mutex_init(&LOCK_pool,    MY_MUTEX_INIT_FAST);
  pthread_cond_init(&COND_active, 0);
  pthread_cond_init(&COND_pool, 0);

  inited=6;

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  syncing= 0;
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  active=pages;
  pool=pages+1;
  pool_last=pages+npages-1;

  return 0;

err:
  close();
  return 1;
}

/*
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  there is no active page, let's got one from the pool

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  two strategies here:
  1. take the first from the pool
  2. if there're waiters - take the one with the most free space

  TODO page merging. try to allocate adjacent page first,
  so that they can be flushed both in one sync
*/
void TC_LOG_MMAP::get_active_from_pool()
{
  PAGE **p, **best_p=0;
  int best_free;

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  if (syncing)
    pthread_mutex_lock(&LOCK_pool);

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  do
  {
    best_p= p= &pool;
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    if ((*p)->waiters == 0) // can the first page be used ?
      break;                // yes - take it.
4215

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    best_free=0;            // no - trying second strategy
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    for (p=&(*p)->next; *p; p=&(*p)->next)
    {
      if ((*p)->waiters == 0 && (*p)->free > best_free)
      {
        best_free=(*p)->free;
        best_p=p;
      }
    }
  }
  while ((*best_p == 0 || best_free == 0) && overflow());

  active=*best_p;
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  if (active->free == active->size) // we've chosen an empty page
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  {
    tc_log_cur_pages_used++;
    set_if_bigger(tc_log_max_pages_used, tc_log_cur_pages_used);
  }

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  if ((*best_p)->next)              // unlink the page from the pool
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    *best_p=(*best_p)->next;
  else
    pool_last=*best_p;
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  if (syncing)
    pthread_mutex_unlock(&LOCK_pool);
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}

int TC_LOG_MMAP::overflow()
{
  /*
    simple overflow handling - just wait
    TODO perhaps, increase log size ?
    let's check the behaviour of tc_log_page_waits first
  */
  tc_log_page_waits++;
  pthread_cond_wait(&COND_pool, &LOCK_pool);
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  return 1; // always return 1
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}

/*
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  all access to active page is serialized but it's not a problem, as
  we're assuming that fsync() will be a main bottleneck.
  That is, parallelizing writes to log pages we'll decrease number of
  threads waiting for a page, but then all these threads will be waiting
  for a fsync() anyway

  RETURN
         0  - error
  otherwise - "cookie", a number that will be passed as an argument
              to unlog() call. tc_log can define it any way it wants,
              and use for whatever purposes. TC_LOG_MMAP sets it
              to the position in memory where xid was logged to.
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*/

int TC_LOG_MMAP::log(THD *thd, my_xid xid)
{
  int err;
  PAGE *p;
  ulong cookie;

  pthread_mutex_lock(&LOCK_active);

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  /*
    if active page is full - just wait...
    frankly speaking, active->free here accessed outside of mutex
    protection, but it's safe, because it only means we may miss an
    unlog() for the active page, and we're not waiting for it here -
    unlog() does not signal COND_active.
  */
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  while (unlikely(active && active->free == 0))
    pthread_cond_wait(&COND_active, &LOCK_active);

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  /* no active page ? take one from the pool */
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  if (active == 0)
    get_active_from_pool();

  p=active;
  pthread_mutex_lock(&p->lock);

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  /* searching for an empty slot */
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  while (*p->ptr)
  {
    p->ptr++;
    DBUG_ASSERT(p->ptr < p->end);               // because p->free > 0
  }

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  /* found! store xid there and mark the page dirty */
  cookie= (ulong)((uchar *)p->ptr - data);      // can never be zero
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  *p->ptr++= xid;
  p->free--;
  p->state= DIRTY;

  /* to sync or not to sync - this is the question */
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  pthread_mutex_unlock(&LOCK_active);
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  pthread_mutex_lock(&LOCK_sync);
  pthread_mutex_unlock(&p->lock);

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  if (syncing)
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  {                                          // somebody's syncing. let's wait
    p->waiters++;
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    /*
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      note - it must be while (), not do ... while () here
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      as p->state may be not DIRTY when we come here
    */
    while (p->state == DIRTY && syncing)
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      pthread_cond_wait(&p->cond, &LOCK_sync);
    p->waiters--;
    err= p->state == ERROR;
    if (p->state != DIRTY)                   // page was synced
    {
      if (p->waiters == 0)
        pthread_cond_signal(&COND_pool);     // in case somebody's waiting
      pthread_mutex_unlock(&LOCK_sync);
      goto done;                             // we're done
    }
  }                                          // page was not synced! do it now
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  DBUG_ASSERT(active == p && syncing == 0);
  pthread_mutex_lock(&LOCK_active);
  syncing=p;                                 // place is vacant - take it
  active=0;                                  // page is not active anymore
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  pthread_cond_broadcast(&COND_active);      // in case somebody's waiting
  pthread_mutex_unlock(&LOCK_active);
  pthread_mutex_unlock(&LOCK_sync);
  err= sync();

done:
  return err ? 0 : cookie;
}

int TC_LOG_MMAP::sync()
{
  int err;

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  DBUG_ASSERT(syncing != active);
4351 4352 4353 4354 4355

  /*
    sit down and relax - this can take a while...
    note - no locks are held at this point
  */
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  err= my_msync(fd, syncing->start, 1, MS_SYNC);
4357

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  /* page is synced. let's move it to the pool */
4359
  pthread_mutex_lock(&LOCK_pool);
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  pool_last->next=syncing;
  pool_last=syncing;
  syncing->next=0;
  syncing->state= err ? ERROR : POOL;
  pthread_cond_broadcast(&syncing->cond);    // signal "sync done"
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  pthread_cond_signal(&COND_pool);           // in case somebody's waiting
  pthread_mutex_unlock(&LOCK_pool);

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  /* marking 'syncing' slot free */
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  pthread_mutex_lock(&LOCK_sync);
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  syncing=0;
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  pthread_cond_signal(&active->cond);        // wake up a new syncer
  pthread_mutex_unlock(&LOCK_sync);
  return err;
}

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/*
  erase xid from the page, update page free space counters/pointers.
  cookie points directly to the memory where xid was logged
*/
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void TC_LOG_MMAP::unlog(ulong cookie, my_xid xid)
{
  PAGE *p=pages+(cookie/tc_log_page_size);
  my_xid *x=(my_xid *)(data+cookie);

  DBUG_ASSERT(*x == xid);
  DBUG_ASSERT(x >= p->start && x < p->end);
  *x=0;

  pthread_mutex_lock(&p->lock);
  p->free++;
  DBUG_ASSERT(p->free <= p->size);
  set_if_smaller(p->ptr, x);
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  if (p->free == p->size)               // the page is completely empty
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    statistic_decrement(tc_log_cur_pages_used, &LOCK_status);
  if (p->waiters == 0)                 // the page is in pool and ready to rock
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    pthread_cond_signal(&COND_pool);   // ping ... for overflow()
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  pthread_mutex_unlock(&p->lock);
}

void TC_LOG_MMAP::close()
{
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  uint i;
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  switch (inited) {
  case 6:
    pthread_mutex_destroy(&LOCK_sync);
    pthread_mutex_destroy(&LOCK_active);
    pthread_mutex_destroy(&LOCK_pool);
    pthread_cond_destroy(&COND_pool);
  case 5:
    data[0]='A'; // garble the first (signature) byte, in case my_delete fails
  case 4:
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    for (i=0; i < npages; i++)
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    {
      if (pages[i].ptr == 0)
        break;
      pthread_mutex_destroy(&pages[i].lock);
      pthread_cond_destroy(&pages[i].cond);
    }
  case 3:
    my_free((gptr)pages, MYF(0));
  case 2:
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    my_munmap((byte*)data, (size_t)file_length);
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  case 1:
    my_close(fd, MYF(0));
  }
  if (inited>=5) // cannot do in the switch because of Windows
    my_delete(logname, MYF(MY_WME));
  inited=0;
}

int TC_LOG_MMAP::recover()
{
  HASH xids;
  PAGE *p=pages, *end_p=pages+npages;

  if (memcmp(data, tc_log_magic, sizeof(tc_log_magic)))
  {
    sql_print_error("Bad magic header in tc log");
    goto err1;
  }

  /*
    the first byte after magic signature is set to current
    number of storage engines on startup
  */
  if (data[sizeof(tc_log_magic)] != total_ha_2pc)
  {
4448
    sql_print_error("Recovery failed! You must enable "
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                    "exactly %d storage engines that support "
                    "two-phase commit protocol",
                    data[sizeof(tc_log_magic)]);
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    goto err1;
  }

  if (hash_init(&xids, &my_charset_bin, tc_log_page_size/3, 0,
            sizeof(my_xid), 0, 0, MYF(0)))
    goto err1;

  for ( ; p < end_p ; p++)
  {
    for (my_xid *x=p->start; x < p->end; x++)
      if (*x && my_hash_insert(&xids, (byte *)x))
        goto err2; // OOM
  }

  if (ha_recover(&xids))
    goto err2;

  hash_free(&xids);
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  bzero(data, (size_t)file_length);
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  return 0;

err2:
  hash_free(&xids);
err1:
  sql_print_error("Crash recovery failed. Either correct the problem "
                  "(if it's, for example, out of memory error) and restart, "
                  "or delete tc log and start mysqld with "
                  "--tc-heuristic-recover={commit|rollback}");
  return 1;
}
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#endif

TC_LOG *tc_log;
TC_LOG_DUMMY tc_log_dummy;
TC_LOG_MMAP  tc_log_mmap;
4487

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/*
  Perform heuristic recovery, if --tc-heuristic-recover was used

  RETURN VALUE
    0	no heuristic recovery was requested
    1   heuristic recovery was performed

  NOTE
    no matter whether heuristic recovery was successful or not
    mysqld must exit. So, return value is the same in both cases.
*/

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int TC_LOG::using_heuristic_recover()
{
  if (!tc_heuristic_recover)
    return 0;

  sql_print_information("Heuristic crash recovery mode");
  if (ha_recover(0))
    sql_print_error("Heuristic crash recovery failed");
  sql_print_information("Please restart mysqld without --tc-heuristic-recover");
  return 1;
}

/****** transaction coordinator log for 2pc - binlog() based solution ******/
4513
#define TC_LOG_BINLOG MYSQL_BIN_LOG
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/*
  TODO keep in-memory list of prepared transactions
  (add to list in log(), remove on unlog())
  and copy it to the new binlog if rotated
  but let's check the behaviour of tc_log_page_waits first!
*/

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int TC_LOG_BINLOG::open(const char *opt_name)
4523
{
4524 4525
  LOG_INFO log_info;
  int      error= 1;
4526 4527

  DBUG_ASSERT(total_ha_2pc > 1);
4528
  DBUG_ASSERT(opt_name && opt_name[0]);
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  pthread_mutex_init(&LOCK_prep_xids, MY_MUTEX_INIT_FAST);
  pthread_cond_init (&COND_prep_xids, 0);

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  if (!my_b_inited(&index_file))
  {
    /* There was a failure to open the index file, can't open the binlog */
    cleanup();
    return 1;
  }

4540
  if (using_heuristic_recover())
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  {
    /* generate a new binlog to mask a corrupted one */
    open(opt_name, LOG_BIN, 0, WRITE_CACHE, 0, max_binlog_size, 0);
    cleanup();
4545
    return 1;
4546
  }
4547

4548
  if ((error= find_log_pos(&log_info, NullS, 1)))
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  {
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    if (error != LOG_INFO_EOF)
      sql_print_error("find_log_pos() failed (error: %d)", error);
    else
      error= 0;
    goto err;
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  }
4556 4557 4558 4559 4560

  {
    const char *errmsg;
    IO_CACHE    log;
    File        file;
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    Log_event  *ev=0;
    Format_description_log_event fdle(BINLOG_VERSION);
4563
    char        log_name[FN_REFLEN];
4564 4565 4566 4567

    if (! fdle.is_valid())
      goto err;

4568
    do
4569
    {
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      strmake(log_name, log_info.log_file_name, sizeof(log_name)-1);
    } while (!(error= find_next_log(&log_info, 1)));

    if (error !=  LOG_INFO_EOF)
    {
      sql_print_error("find_log_pos() failed (error: %d)", error);
      goto err;
4577
    }
4578

4579
    if ((file= open_binlog(&log, log_name, &errmsg)) < 0)
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    {
      sql_print_error("%s", errmsg);
      goto err;
    }

4585 4586 4587
    if ((ev= Log_event::read_log_event(&log, 0, &fdle)) &&
        ev->get_type_code() == FORMAT_DESCRIPTION_EVENT &&
        ev->flags & LOG_EVENT_BINLOG_IN_USE_F)
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    {
      sql_print_information("Recovering after a crash using %s", opt_name);
4590
      error= recover(&log, (Format_description_log_event *)ev);
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    }
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    else
      error=0;
4594 4595 4596 4597 4598 4599 4600 4601 4602 4603

    delete ev;
    end_io_cache(&log);
    my_close(file, MYF(MY_WME));

    if (error)
      goto err;
  }

err:
4604
  return error;
4605 4606
}

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/* this is called on shutdown, after ha_panic */
void TC_LOG_BINLOG::close()
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{
  DBUG_ASSERT(prepared_xids==0);
  pthread_mutex_destroy(&LOCK_prep_xids);
  pthread_cond_destroy (&COND_prep_xids);
}

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/*
  TODO group commit

  RETURN
         0  - error
         1  - success
*/
int TC_LOG_BINLOG::log(THD *thd, my_xid xid)
4623
{
4624
  DBUG_ENTER("TC_LOG_BINLOG::log");
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  Xid_log_event xle(thd, xid);
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  binlog_trx_data *trx_data=
4627
    (binlog_trx_data*) thd->ha_data[binlog_hton->slot];
4628
  DBUG_RETURN(!binlog_end_trans(thd, trx_data, &xle));  // invert return value
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}

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void TC_LOG_BINLOG::unlog(ulong cookie, my_xid xid)
4632
{
4633 4634
  pthread_mutex_lock(&LOCK_prep_xids);
  if (--prepared_xids == 0)
4635
    pthread_cond_signal(&COND_prep_xids);
4636
  pthread_mutex_unlock(&LOCK_prep_xids);
4637
  rotate_and_purge(0);     // as ::write() did not rotate
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}

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int TC_LOG_BINLOG::recover(IO_CACHE *log, Format_description_log_event *fdle)
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{
  Log_event  *ev;
  HASH xids;
  MEM_ROOT mem_root;

  if (! fdle->is_valid() ||
4647
      hash_init(&xids, &my_charset_bin, TC_LOG_PAGE_SIZE/3, 0,
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            sizeof(my_xid), 0, 0, MYF(0)))
    goto err1;

4651
  init_alloc_root(&mem_root, TC_LOG_PAGE_SIZE, TC_LOG_PAGE_SIZE);
4652

4653 4654
  fdle->flags&= ~LOG_EVENT_BINLOG_IN_USE_F; // abort on the first error

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  while ((ev= Log_event::read_log_event(log,0,fdle)) && ev->is_valid())
  {
    if (ev->get_type_code() == XID_EVENT)
    {
      Xid_log_event *xev=(Xid_log_event *)ev;
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      byte *x=(byte *)memdup_root(&mem_root, (char *)& xev->xid,
                                  sizeof(xev->xid));
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      if (! x)
        goto err2;
      my_hash_insert(&xids, x);
    }
    delete ev;
  }

  if (ha_recover(&xids))
    goto err2;

  free_root(&mem_root, MYF(0));
  hash_free(&xids);
  return 0;

err2:
  free_root(&mem_root, MYF(0));
  hash_free(&xids);
err1:
  sql_print_error("Crash recovery failed. Either correct the problem "
                  "(if it's, for example, out of memory error) and restart, "
                  "or delete (or rename) binary log and start mysqld with "
                  "--tc-heuristic-recover={commit|rollback}");
  return 1;
}

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struct st_mysql_storage_engine binlog_storage_engine=
4688
{ MYSQL_HANDLERTON_INTERFACE_VERSION };
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mysql_declare_plugin(binlog)
{
  MYSQL_STORAGE_ENGINE_PLUGIN,
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  &binlog_storage_engine,
  "binlog",
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  "MySQL AB",
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  "This is a pseudo storage engine to represent the binlog in a transaction",
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  PLUGIN_LICENSE_GPL,
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  binlog_init, /* Plugin Init */
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  NULL, /* Plugin Deinit */
  0x0100 /* 1.0 */,
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  NULL,                       /* status variables                */
  NULL,                       /* system variables                */
  NULL                        /* config options                  */
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}
mysql_declare_plugin_end;