IM mostly fixed according to Brian's directions. Will need to do some...

IM mostly fixed according to Brian's directions. Will need to do some additional option handling and cleanups


server-tools/instance-manager/Makefile.am:
  New file added
server-tools/instance-manager/client_func.c:
  typo fixed
server-tools/instance-manager/commands.cc:
  there are no admin-user snd admin-password fields anymore, so no need to show their values
server-tools/instance-manager/guardian.cc:
  Syncronization added -- now guardian wakes up whenever SIGCLD has been catched
server-tools/instance-manager/guardian.h:
  Condition variable declared
server-tools/instance-manager/instance.cc:
  Persistent connection to the instance removed. Now we use SIGTERM instead of com_shutdown for STOP. We also
  manage SIGCHLD ourselves now (therefore no double fork).
server-tools/instance-manager/instance.h:
  Pointer to the instance_map added, MySQL connection structures removed
server-tools/instance-manager/instance_map.cc:
  More syncronization added (to make proper STOP)
server-tools/instance-manager/instance_map.h:
  added condition variable and mutex for connection threads to wait for SIGCHLD
server-tools/instance-manager/instance_options.cc:
  defaults-handling methods have been added.
server-tools/instance-manager/instance_options.h:
  New functions and constants declared
server-tools/instance-manager/listener.cc:
  No changes here (bk bug?)
server-tools/instance-manager/manager.cc:
  SIGCHLD handling added

server-tools/instance-manager/Makefile.am

@@ -75,6 +75,7 @@ mysqlmanager_SOURCES=	command.cc command.h mysqlmanager.cc \
 			instance_options.h instance_options.cc \
 			buffer.h buffer.cc parse.cc parse.h \
 			guardian.cc guardian.h \
+			parse_output.cc parse_output.h \
                         mysql_manager_error.h client_func.c
 
 mysqlmanager_LDADD=	liboptions.a \

server-tools/instance-manager/client_func.c

@@ -3,7 +3,7 @@
 #include <mysql.h>
 
 /*
-  Currently we cannot use libmysqlclient directly becouse of the linking
+  Currently we cannot use libmysqlclient directly because of the linking
   issues. Here we provide needed libmysqlclient functions.
   TODO: to think how to use libmysqlclient code instead of copy&paste.
   The other possible solution is to use simple_command directly.

server-tools/instance-manager/commands.cc

@@ -175,7 +175,7 @@ int Show_instance_status::do_command(struct st_net *net,
     if (instance->is_running())
     {
       store_to_string(&send_buff, (char *) "online", &position);
-      store_to_string(&send_buff, mysql_get_server_info(&(instance->mysql)), &position);
+      store_to_string(&send_buff, "unknown", &position);
     }
     else
     {
@@ -283,28 +283,6 @@ int Show_instance_options::do_command(struct st_net *net,
         goto err;
     }
 
-    if (instance->options.mysqld_user != NULL)
-    {
-      position= 0;
-      store_to_string(&send_buff, (char *) "admin-user", &position);
-      store_to_string(&send_buff,
-                      (char *) instance->options.mysqld_user,
-                      &position);
-      if (my_net_write(net, send_buff.buffer, (uint) position))
-        goto err;
-    }
-
-    if (instance->options.mysqld_password != NULL)
-    {
-      position= 0;
-      store_to_string(&send_buff, (char *) "admin-password", &position);
-      store_to_string(&send_buff,
-                      (char *) instance->options.mysqld_password,
-                      &position);
-      if (my_net_write(net, send_buff.buffer, (uint) position))
-        goto err;
-    }
-
     /* loop through the options stored in DYNAMIC_ARRAY */
     for (uint i= 0; i < instance->options.options_array.elements; i++)
     {

server-tools/instance-manager/guardian.cc

@@ -45,6 +45,7 @@ Guardian_thread::Guardian_thread(Thread_registry &thread_registry_arg,
   thread_info(pthread_self())
 {
   pthread_mutex_init(&LOCK_guardian, 0);
+  pthread_cond_init(&COND_guardian, 0);
   thread_registry.register_thread(&thread_info);
   init_alloc_root(&alloc, MEM_ROOT_BLOCK_SIZE, 0);
   guarded_instances= NULL;
@@ -60,6 +61,7 @@ Guardian_thread::~Guardian_thread()
   thread_registry.unregister_thread(&thread_info);
   pthread_mutex_unlock(&LOCK_guardian);
   pthread_mutex_destroy(&LOCK_guardian);
+  pthread_cond_destroy(&COND_guardian);
 }
 
 
@@ -79,27 +81,32 @@ void Guardian_thread::run()
 {
   Instance *instance;
   LIST *loop;
+  struct timespec timeout;
 
   my_thread_init();
+  pthread_mutex_lock(&LOCK_guardian);
+
 
   while (!thread_registry.is_shutdown())
   {
-    pthread_mutex_lock(&LOCK_guardian);
     loop= guarded_instances;
     while (loop != NULL)
     {
       instance= (Instance *) loop->data;
-      /* instance-> start already checks whether instance is running */
+      /* instance-> start already checks whether the instance is running */
       if (instance->start() != ER_INSTANCE_ALREADY_STARTED)
         log_info("guardian attempted to restart instance %s",
                  instance->options.instance_name);
       loop= loop->next;
     }
     move_to_list(&starting_instances, &guarded_instances);
-    pthread_mutex_unlock(&LOCK_guardian);
-    sleep(monitoring_interval);
+    timeout.tv_sec= time(NULL) + monitoring_interval;
+    timeout.tv_nsec= 0;
+
+    pthread_cond_timedwait(&COND_guardian, &LOCK_guardian, &timeout);
   }
 
+  pthread_mutex_unlock(&LOCK_guardian);
   my_thread_end();
 }
 

server-tools/instance-manager/guardian.h

@@ -70,6 +70,9 @@ class Guardian_thread: public Guardian_thread_args
   int guard(Instance *instance);
   int stop_guard(Instance *instance);
 
+public:
+  pthread_cond_t COND_guardian;
+
 private:
   int add_instance_to_list(Instance *instance, LIST **list);
   void move_to_list(LIST **from, LIST **to);

server-tools/instance-manager/instance.cc

@@ -21,6 +21,7 @@
 #include "instance.h"
 #include "mysql_manager_error.h"
 #include "log.h"
+#include "instance_map.h"
 #include <my_sys.h>
 #include <signal.h>
 #include <m_string.h>
@@ -41,24 +42,18 @@
 
 int Instance::start()
 {
-  pid_t pid;
-
+  /* echk for the pidfile and remove it */
   if (!is_running())
   {
-    log_info("trying to start instance %s", options.instance_name);
+    stop();
+    log_info("starting instance %s", options.instance_name);
     switch (pid= fork()) {
     case 0:
-       if (fork()) /* zombie protection */
-         exit(0); /* parent goes bye-bye */
-       else
-       {
-         execv(options.mysqld_path, options.argv);
-         exit(1);
-       }
+      execv(options.mysqld_path, options.argv);
+      exit(1);
     case -1:
       return ER_CANNOT_START_INSTANCE;
     default:
-      waitpid(pid, NULL, 0);
       return 0;
     }
   }
@@ -67,15 +62,9 @@ int Instance::start()
   return ER_INSTANCE_ALREADY_STARTED;
 }
 
+
 int Instance::cleanup()
 {
-  /*
-    We cannot close connection in destructor, as mysql_close needs alarm
-    services which are definitely unavailaible at the time of destructor
-    call.
-  */
-  if (is_connected)
-    mysql_close(&mysql);
   return 0;
 }
 
@@ -88,8 +77,13 @@ Instance::~Instance()
 
 bool Instance::is_running()
 {
+  MYSQL mysql;
   uint port= 0;
   const char *socket= NULL;
+  const char *password= "321rarepassword213";
+  const char *username= "645rareusername945";
+  const char *access_denied_message= "Access denied for user";
+  bool return_val;
 
   if (options.mysqld_port)
     port= atoi(strchr(options.mysqld_port, '=') + 1);
@@ -98,30 +92,40 @@ bool Instance::is_running()
     socket= strchr(options.mysqld_socket, '=') + 1;
 
   pthread_mutex_lock(&LOCK_instance);
-  if (!is_connected)
+
+  mysql_init(&mysql);
+  /* try to connect to a server with the fake username/password pair */
+  if (mysql_real_connect(&mysql, LOCAL_HOST, username,
+                         password,
+                         NullS, port,
+                         socket, 0))
   {
-    mysql_init(&mysql);
-    if (mysql_real_connect(&mysql, LOCAL_HOST, options.mysqld_user,
-                           options.mysqld_password,
-                           NullS, port,
-                           socket, 0))
-    {
-      mysql.reconnect= 1;
-      is_connected= TRUE;
-      pthread_mutex_unlock(&LOCK_instance);
-      return TRUE;
-    }
+    /*
+      Very strange. We have successfully connected to the server using
+      bullshit as username/password. Write a warning to the logfile.
+    */
+    log_info("The Instance Manager was able to log into you server \
+             with faked compiled-in password while checking server status. \
+             Looks like something is wrong.");
     mysql_close(&mysql);
     pthread_mutex_unlock(&LOCK_instance);
-    return FALSE;
+    return_val= TRUE;                           /* server is alive */
   }
-  else if (!mysql_ping(&mysql))
+  else
   {
-    pthread_mutex_unlock(&LOCK_instance);
-    return TRUE;
+    if (!strncmp(access_denied_message, mysql_error(&mysql),
+                 sizeof(access_denied_message)-1))
+    {
+      return_val= TRUE;
+    }
+    else
+      return_val= FALSE;
   }
+
+  mysql_close(&mysql);
   pthread_mutex_unlock(&LOCK_instance);
-  return FALSE;
+
+  return return_val;
 }
 
 
@@ -139,13 +143,58 @@ bool Instance::is_running()
 
 int Instance::stop()
 {
-  if (is_running())
+  pid_t pid;
+  struct timespec timeout;
+  time_t waitchild= 35;                         /*  */
+
+  if ((pid= options.get_pid()) != 0)            /* get pid from pidfile */
   {
-    if (mysql_shutdown(&mysql, SHUTDOWN_DEFAULT))
-      goto err;
+    /*
+      If we cannot kill mysqld, then it has propably crashed.
+      Let us try to remove staled pidfile and return succes as mysqld
+      is stopped
+    */
+    if (kill(pid, SIGTERM))
+    {
+      if (options.unlink_pidfile())
+        log_error("cannot remove pidfile for instance %i, this might be \
+                  since IM lacks permmissions or hasn't found the pidifle",
+                  options.instance_name);
+
+      log_error("The instance %s has probably crashed or IM lacks permissions \
+                to kill it. in either case something seems to be wrong. \
+                Check your setup", options.instance_name);
+      return 0;
+    }
+
+    /* sleep on condition to wait for SIGCHLD */
+
+    timeout.tv_sec= time(NULL) + waitchild;
+    timeout.tv_nsec= 0;
+    if (pthread_mutex_lock(&instance_map->pid_cond.LOCK_pid))
+      goto err; /* perhaps this should be procecced differently */
+
+    while (options.get_pid() != 0)
+    {
+      int status;
+
+      status= pthread_cond_timedwait(&instance_map->pid_cond.COND_pid,
+                                     &instance_map->pid_cond.LOCK_pid,
+                                     &timeout);
+      if (status == ETIMEDOUT)
+        break;
+    }
+
+    pthread_mutex_unlock(&instance_map->pid_cond.LOCK_pid);
+
+    if (!kill(pid, SIGKILL))
+    {
+      log_error("The instance %s has been stopped forsibly. Normally \
+                it should not happed. Probably the instance has been \
+                hanging. You should also check your IM setup",
+                options.instance_name);
+    }
 
-    mysql_close(&mysql);
-    is_connected= FALSE;
     return 0;
   }
 
@@ -166,3 +215,10 @@ int Instance::init(const char *name_arg)
 
   return options.init(name_arg);
 }
+
+
+int Instance::complete_initialization(Instance_map *instance_map_arg)
+{
+  instance_map= instance_map_arg;
+  return 0;
+}

server-tools/instance-manager/instance.h

@@ -25,14 +25,14 @@
 #pragma interface
 #endif
 
+class Instance_map;
+
 class Instance
 {
 public:
-  Instance(): is_connected(FALSE)
-  {}
   ~Instance();
-
   int init(const char *name);
+  int complete_initialization(Instance_map *instance_map_arg);
 
   /* check if the instance is running and set up mysql connection if yes */
   bool is_running();
@@ -44,7 +44,7 @@ class Instance
   Instance_options options;
 
   /* connection to the instance */
-  MYSQL mysql;
+  pid_t pid;
 
 private:
   /*
@@ -53,8 +53,7 @@ class Instance
     and we issue the start command once more.
   */
   pthread_mutex_t LOCK_instance;
-  /* Here we store the state of the following connection */
-  bool is_connected;
+  Instance_map *instance_map;
 };
 
 #endif /* INCLUDES_MYSQL_INSTANCE_MANAGER_INSTANCE_H */

server-tools/instance-manager/instance_map.cc

@@ -123,6 +123,9 @@ Instance_map::Instance_map(const char *default_mysqld_path_arg,
 
 int Instance_map::init()
 {
+  pthread_mutex_init(&pid_cond.LOCK_pid, 0);
+  pthread_cond_init(&pid_cond.COND_pid, 0);
+
   if (hash_init(&hash, default_charset_info, START_HASH_SIZE, 0, 0,
                 get_instance_key, delete_instance, 0))
     return 1;
@@ -135,6 +138,8 @@ Instance_map::~Instance_map()
   hash_free(&hash);
   pthread_mutex_unlock(&LOCK_instance_map);
   pthread_mutex_destroy(&LOCK_instance_map);
+  pthread_mutex_destroy(&pid_cond.LOCK_pid);
+  pthread_cond_destroy(&pid_cond.COND_pid);
 }
 
 
@@ -189,6 +194,7 @@ void Instance_map::complete_initialization()
   while (i < hash.records)
   {
     instance= (Instance *) hash_element(&hash, i);
+    instance->complete_initialization(this);
     instance->options.complete_initialization(mysqld_path, user, password);
     i++;
   }
@@ -218,7 +224,8 @@ Instance_map::find(uint instance_number)
   Instance *instance;
   char name[80];
 
-  sprintf(name, "mysqld%i", instance_number);
+  snprintf(name, sizeof(name) - 1, "mysqld%i", instance_number);
+  name[sizeof(name) - 1]= 0; /* safety */
   pthread_mutex_lock(&LOCK_instance_map);
   instance= (Instance *) hash_search(&hash, (byte *) name, strlen(name));
   pthread_mutex_unlock(&LOCK_instance_map);

server-tools/instance-manager/instance_map.h

@@ -27,6 +27,12 @@
 #include "protocol.h"
 #include "guardian.h"
 
+typedef struct st_instance_cond
+{
+  pthread_mutex_t LOCK_pid;
+  pthread_cond_t COND_pid;
+} CHILD_COND;
+
 class Instance;
 extern int load_all_groups(char ***groups, const char *filename);
 extern void free_groups(char **groups);
@@ -83,6 +89,8 @@ class Instance_map
   const char *user;
   const char *password;
   Guardian_thread *guardian;
+  /* structure used for syncronization reasons in the stop command */
+  CHILD_COND pid_cond;
 
 private:
   enum { START_HASH_SIZE = 16 };

server-tools/instance-manager/instance_options.cc

@@ -19,20 +19,105 @@
 #endif
 
 #include "instance_options.h"
+#include "parse_output.h"
+#include "buffer.h"
 #include <my_sys.h>
 #include <mysql.h>
 #include <signal.h>
 #include <m_string.h>
 
+
+/* option_name should be prefixed with "--" */
+int Instance_options::get_default_option(char *result, const char *option_name,
+                                         size_t result_len)
+{
+  int position= 0;
+  char verbose_option[]= " --no-defaults --verbose --help";
+  Buffer cmd;
+
+  cmd.append(position, mysqld_path, strlen(mysqld_path));
+  position+=  strlen(mysqld_path);
+  cmd.append(position, verbose_option, sizeof(verbose_option) - 1);
+  position+= sizeof(verbose_option) - 1;
+  cmd.append(position, "\0", 1);
+  /* get the value from "mysqld --help --verbose" */
+  if (parse_output_and_get_value(cmd.buffer, option_name + 2,
+                                 result, result_len))
+    return 1;
+
+  return 0;
+}
+
+
+void Instance_options::get_pid_filename(char *result)
+{
+  const char *pid_file= mysqld_pid_file;
+  char datadir[MAX_PATH_LEN];
+
+  if (mysqld_datadir == NULL)
+  {
+    get_default_option(datadir, "--datadir", MAX_PATH_LEN);
+  }
+  else
+    strxnmov(datadir, MAX_PATH_LEN - 1, strchr(mysqld_datadir, '=') + 1,
+             "/", NullS);
+
+  /* well, we should never get it */
+  if (mysqld_pid_file != NULL)
+    pid_file= strchr(pid_file, '=') + 1;
+  else
+    DBUG_ASSERT(0);
+
+  /* get the full path to the pidfile */
+  my_load_path(result, pid_file, datadir);
+
+}
+
+
+int Instance_options::unlink_pidfile()
+{
+  char pid_file_path[MAX_PATH_LEN];
+
+  /*
+    This works as we know that pid_file_path is of
+    MAX_PATH_LEN == FN_REFLEN length
+  */
+  get_pid_filename((char *)&pid_file_path);
+
+  return unlink(pid_file_path);
+}
+
+
+pid_t Instance_options::get_pid()
+{
+  char pid_file_path[MAX_PATH_LEN];
+
+  /*
+    This works as we know that pid_file_path is of
+    MAX_PATH_LEN == FN_REFLEN length
+  */
+  get_pid_filename((char *)&pid_file_path);
+
+  /* get the pid */
+  if (FILE *pid_file_stream= my_fopen(pid_file_path,
+                                      O_RDONLY | O_BINARY, MYF(0)))
+  {
+    pid_t pid;
+
+    fscanf(pid_file_stream, "%i", &pid);
+    my_fclose(pid_file_stream, MYF(0));
+    return pid;
+  }
+  else
+    return 0;
+}
+
+
 int Instance_options::complete_initialization(const char *default_path,
                                               const char *default_user,
                                               const char *default_password)
 {
-  /* we need to reserve space for the final zero + possible default options */
-  if (!(argv= (char**) alloc_root(&alloc, (options_array.elements + 1
-                       + MAX_NUMBER_OF_DEFAULT_OPTIONS) * sizeof(char*))))
-  goto err;
-
+  const char *tmp;
 
   if (mysqld_path == NULL)
   {
@@ -40,22 +125,34 @@ int Instance_options::complete_initialization(const char *default_path,
       goto err;
   }
 
-  /* this option must be first in the argv */
-  if (add_to_argv(mysqld_path))
+  if (!(tmp= strdup_root(&alloc, "--no-defaults")))
     goto err;
 
-  /* the following options are not for argv */
-  if (mysqld_user == NULL)
+  if (mysqld_pid_file == NULL)
   {
-    if (!(mysqld_user= strdup_root(&alloc, default_user)))
-      goto err;
+    char pidfilename[MAX_PATH_LEN];
+    char hostname[MAX_PATH_LEN];
+    if (!gethostname(hostname, sizeof(hostname) - 1))
+      strxnmov(pidfilename, MAX_PATH_LEN - 1, "--pid-file=", hostname, "-",
+               instance_name, ".pid", NullS);
+    else
+      strxnmov(pidfilename, MAX_PATH_LEN - 1, "--pid-file=", instance_name,
+               ".pid", NullS);
+
+    add_option(pidfilename);
   }
 
-  if (mysqld_password == NULL)
-  {
-    if (!(mysqld_password= strdup_root(&alloc, default_password)))
-      goto err;
-  }
+  /* we need to reserve space for the final zero + possible default options */
+  if (!(argv= (char**) alloc_root(&alloc, (options_array.elements + 1
+                       + MAX_NUMBER_OF_DEFAULT_OPTIONS) * sizeof(char*))))
+  goto err;
+
+  /* the path must be first in the argv */
+  if (add_to_argv(mysqld_path))
+    goto err;
+
+  if (add_to_argv(tmp))
+    goto err;
 
   memcpy((gptr) (argv + filled_default_options), options_array.buffer,
          options_array.elements*sizeof(char*));
@@ -102,8 +199,6 @@ int Instance_options::add_option(const char* option)
     {"--bind-address=", 15, &mysqld_bind_address, SAVE_WHOLE_AND_ADD},
     {"--pid-file=", 11, &mysqld_pid_file, SAVE_WHOLE_AND_ADD},
     {"--mysqld-path=", 14, &mysqld_path, SAVE_VALUE},
-    {"--admin-user=", 13, &mysqld_user, SAVE_VALUE},
-    {"--admin-password=", 17, &mysqld_password, SAVE_VALUE},
     {"--guarded", 9, &is_guarded, SAVE_WHOLE},
     {NULL, 0, NULL, 0}
   };

server-tools/instance-manager/instance_options.h

@@ -38,8 +38,8 @@ class Instance_options
 public:
   Instance_options() :
     mysqld_socket(0), mysqld_datadir(0), mysqld_bind_address(0),
-    mysqld_pid_file(0), mysqld_port(0), mysqld_path(0), mysqld_user(0),
-    mysqld_password(0), is_guarded(0), filled_default_options(0)
+    mysqld_pid_file(0), mysqld_port(0), mysqld_path(0), is_guarded(0),
+    filled_default_options(0)
   {}
   ~Instance_options();
   /* fills in argv */
@@ -49,9 +49,17 @@ class Instance_options
 
   int add_option(const char* option);
   int init(const char *instance_name_arg);
+  pid_t get_pid();
+  void get_pid_filename(char *result);
+  int unlink_pidfile();
 
 public:
-  enum { MAX_NUMBER_OF_DEFAULT_OPTIONS= 1 };
+  /*
+    We need this value to be greater or equal then FN_REFLEN found in
+    my_global.h to use my_load_path()
+  */
+  enum { MAX_PATH_LEN= 512 };
+  enum { MAX_NUMBER_OF_DEFAULT_OPTIONS= 2 };
   enum { MEM_ROOT_BLOCK_SIZE= 512 };
   char **argv;
   /* We need the some options, so we store them as a separate pointers */
@@ -63,12 +71,12 @@ class Instance_options
   uint instance_name_len;
   const char *instance_name;
   const char *mysqld_path;
-  const char *mysqld_user;
-  const char *mysqld_password;
   const char *is_guarded;
   DYNAMIC_ARRAY options_array;
 private:
   int add_to_argv(const char *option);
+  int get_default_option(char *result, const char *option_name,
+                           size_t result_len);
 private:
   uint filled_default_options;
   MEM_ROOT alloc;

server-tools/instance-manager/manager.cc

@@ -16,12 +16,6 @@
 
 #include "manager.h"
 
-#include <my_global.h>
-#include <my_sys.h>
-#include <m_string.h>
-#include <signal.h>
-#include <thr_alarm.h>
-
 #include "thread_registry.h"
 #include "listener.h"
 #include "instance_map.h"
@@ -30,6 +24,14 @@
 #include "log.h"
 #include "guardian.h"
 
+#include <my_global.h>
+#include <my_sys.h>
+#include <m_string.h>
+#include <signal.h>
+#include <thr_alarm.h>
+#include <sys/wait.h>
+
+
 static int create_pid_file(const char *pid_file_name)
 {
   if (FILE *pid_file= my_fopen(pid_file_name,
@@ -90,6 +92,7 @@ void manager(const Options &options)
   sigemptyset(&mask);
   sigaddset(&mask, SIGINT);
   sigaddset(&mask, SIGTERM);
+  sigaddset(&mask, SIGCHLD);
   sigaddset(&mask, SIGPIPE);
   sigaddset(&mask, SIGHUP);
   /*
@@ -170,6 +173,13 @@ void manager(const Options &options)
       case THR_SERVER_ALARM:
         process_alarm(signo);
       break;
+      case SIGCHLD:
+        wait(NULL);
+        /* wake threads waiting for an instance to shutdown */
+        pthread_cond_broadcast(&instance_map.pid_cond.COND_pid);
+        /* wake guardian */
+        pthread_cond_broadcast(&guardian_thread.COND_guardian);
+      break;
       default:
         thread_registry.deliver_shutdown();
         shutdown_complete= TRUE;

server-tools/instance-manager/parse_output.cc

+/* Copyright (C) 2004 MySQL AB
+
+   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.
+
+   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.
+
+   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 */
+
+#include <stdio.h>
+#include <my_global.h>
+#include <my_sys.h>
+#include <string.h>
+
+/* buf should be of appropriate size. Otherwise the word will be truncated */
+static int get_word(FILE *file, char *buf, size_t size)
+{
+  int currchar;
+
+  currchar= getc(file);
+
+  /* skip space */
+  while (my_isspace(default_charset_info, (char) currchar) &&
+         currchar != EOF && size > 1)
+  {
+    currchar= getc(file);
+  }
+
+  while (!my_isspace(default_charset_info, (char) currchar) &&
+         currchar != EOF && size > 1)
+  {
+    *buf++= (char) currchar;
+    currchar= getc(file);
+    size--;
+  }
+
+  *buf= '\0';
+  return 0;
+}
+
+
+int parse_output_and_get_value(const char *command, const char *word,
+                               char *result, size_t result_len)
+{
+  FILE *output;
+  int wordlen;
+
+  wordlen= strlen(word);
+
+  output= popen(command, "r");
+
+  /*
+    We want fully buffered stream. We also want system to
+    allocate appropriate buffer.
+  */
+  setvbuf(output, NULL, _IOFBF, 0);
+
+  get_word(output, result, result_len);
+  while (strncmp(word, result, wordlen) && *result != '\0')
+  {
+    get_word(output, result, result_len);
+  }
+
+  /*
+    If we have found the word, return the next one. This is usually
+    an option value.
+  */
+  if (*result != '\0')
+    get_word(output, result, result_len);
+
+  if (pclose(output))
+    return 1;
+
+  return 0;
+}

server-tools/instance-manager/parse_output.h

+/* Copyright (C) 2004 MySQL AB
+
+   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.
+
+   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.
+
+   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 */
+
+int parse_output_and_get_value(const char *command, const char *word,
+                               char *result, size_t result_len);
+