SHOW TABLE STATUS now prints create_time, update_time and check_time

for InnoDB tables. Note that these times may always be correct ones,
because for example ALTER TABLE creates a table again.



innobase/include/os0file.h:
  Added information of file timestamps and a function os_file_get_status
  to get that information using stat().
innobase/os/os0file.c:
  Added function that return information obout the specified file.
sql/ha_innodb.cc:
  Get timestamps for the file where the table is stored.

innobase/include/os0file.h

@@ -14,6 +14,7 @@ Created 10/21/1995 Heikki Tuuri
 #ifndef __WIN__
 #include <dirent.h>
 #include <sys/stat.h>
+#include <time.h>
 #endif
 
 extern ibool	os_do_not_call_flush_at_each_write;
@@ -142,12 +143,15 @@ bigger than 4000 bytes */
 #define OS_FILE_MAX_PATH	4000
 
 /* Struct used in fetching information of a file in a directory */
-typedef struct os_file_stat_struct	os_file_stat_t;
 struct os_file_stat_struct{
-       char		name[OS_FILE_MAX_PATH];	/* path to a file */
-       os_file_type_t	type;			/* file type */       
-       ib_longlong	size;			/* file size */
+	char		name[OS_FILE_MAX_PATH];	/* path to a file */
+	os_file_type_t	type;			/* file type */
+	ib_longlong	size;			/* file size */
+	time_t          ctime;			/* creation time */
+	time_t		mtime;			/* modification time */
+	time_t		atime;			/* access time */
 };
+typedef struct os_file_stat_struct	os_file_stat_t;
 
 #ifdef __WIN__
 typedef HANDLE  os_file_dir_t;	/* directory stream */
@@ -686,5 +690,14 @@ no pending io operations. */
 ibool
 os_aio_all_slots_free(void);
 /*=======================*/
-				/* out: TRUE if all free */
+
+/***********************************************************************
+This function returns information about the specified file */
+ibool
+os_file_get_status(
+/*===============*/
+					/* out: TRUE if stat information found */
+	const char*     path,		/* in:  pathname of the file */
+	os_file_stat_t* stat_info);	/* information of a file in a directory */
+
 #endif 

innobase/os/os0file.c

@@ -2359,6 +2359,83 @@ os_file_status(
 #endif
 }
 
+/***********************************************************************
+This function returns information about the specified file */
+
+ibool
+os_file_get_status(
+/*===========*/
+				/* out: TRUE if stat information found */
+	const char*	path,	/* in:  pathname of the file */
+	os_file_stat_t* stat_info) /* information of a file in a directory */
+{
+#ifdef __WIN__
+	int		ret;
+	struct _stat	statinfo;
+	
+	ret = _stat(path, &statinfo);
+	if (ret && (errno == ENOENT || errno == ENOTDIR)) {
+		/* file does not exist */
+
+		return(FALSE);
+	} else if (ret) {
+		/* file exists, but stat call failed */
+		
+		os_file_handle_error_no_exit(0, path, "stat");
+		
+		return(FALSE);
+	}
+	if (_S_IFDIR & statinfo.st_mode) {
+		stat_info->type = OS_FILE_TYPE_DIR;
+	} else if (_S_IFREG & statinfo.st_mode) {
+	        stat_info->type = OS_FILE_TYPE_FILE;
+	} else {
+	        stat_info_>type = OS_FILE_TYPE_UNKNOWN;
+	}
+
+	stat_info->ctime = statinfo.st_ctime;
+	stat_info->atime = statinfo.st_atime;
+	stat_info->mtime = statinfo.st_mtime;
+	stat_info->size  = statinfo.st_size;
+	
+	return(TRUE);
+#else
+	int		ret;
+	struct stat	statinfo;
+	
+	ret = stat(path, &statinfo);
+
+	if (ret && (errno == ENOENT || errno == ENOTDIR)) {
+		/* file does not exist */
+
+		return(FALSE);
+	} else if (ret) {
+		/* file exists, but stat call failed */
+		
+		os_file_handle_error_no_exit(0, path, "stat");
+		
+		return(FALSE);
+	}
+	    
+	if (S_ISDIR(statinfo.st_mode)) {
+		stat_info->type = OS_FILE_TYPE_DIR;
+	} else if (S_ISLNK(statinfo.st_mode)) {
+	        stat_info->type = OS_FILE_TYPE_LINK;
+	} else if (S_ISREG(statinfo.st_mode)) {
+	        stat_info->type = OS_FILE_TYPE_FILE;
+	} else {
+	        stat_info->type = OS_FILE_TYPE_UNKNOWN;
+	}
+
+	stat_info->ctime = statinfo.st_ctime;
+	stat_info->atime = statinfo.st_atime;
+	stat_info->mtime = statinfo.st_mtime;
+	stat_info->size  = statinfo.st_size;
+	
+	return(TRUE);
+#endif
+}
+
 /* path name separator character */
 #ifdef __WIN__
 #  define OS_FILE_PATH_SEPARATOR	'\\'

sql/ha_innodb.cc

@@ -4337,6 +4337,8 @@ ha_innobase::info(
 	ha_rows		rec_per_key;
 	ulong		j;
 	ulong		i;
+	char		path[FN_REFLEN];
+	os_file_stat_t  stat_info;
 
  	DBUG_ENTER("info");
 
@@ -4374,6 +4376,25 @@ ha_innobase::info(
 
 		prebuilt->trx->op_info = (char*)
 		                          "returning various info to MySQL";
+
+		if (ib_table->space != 0) {
+			my_snprintf(path, sizeof(path), "%s/%s%s",
+				    mysql_data_home, ib_table->name,
+				    ".ibd");
+			unpack_filename(path,path);
+		} else {
+			my_snprintf(path, sizeof(path), "%s/%s%s", 
+				    mysql_data_home, ib_table->name,
+				    reg_ext);
+		
+			unpack_filename(path,path);
+		}
+
+		if (os_file_get_status(path,&stat_info)) {
+			create_time = stat_info.ctime;
+			check_time  = stat_info.atime;
+			update_time = stat_info.mtime;
+		}
  	}
 
 	if (flag & HA_STATUS_VARIABLE) {