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/* 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 */
#ifdef __GNUC__
#pragma implementation
#endif
#include "instance.h"
#include "mysql_manager_error.h"
#include "log.h"
#include <my_sys.h>
#include <signal.h>
#include <m_string.h>
#include <sys/wait.h>
/*
The method starts an instance.
SYNOPSYS
start()
RETURN
0 ok
ER_CANNOT_START_INSTANCE Cannot start instance
ER_INSTANCE_ALREADY_STARTED The instance on the specified port/socket
is already started
*/
int Instance::start()
{
pid_t pid;
if (!is_running())
{
log_info("trying to start 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);
}
case -1:
return ER_CANNOT_START_INSTANCE;
default:
waitpid(pid, NULL, 0);
return 0;
}
}
/* the instance is started already */
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;
}
Instance::~Instance()
{
pthread_mutex_destroy(&LOCK_instance);
}
bool Instance::is_running()
{
uint port;
const char *socket;
if (options.mysqld_port)
port= atoi(strchr(options.mysqld_port, '=') + 1);
if (options.mysqld_socket)
socket= strchr(options.mysqld_socket, '=') + 1;
pthread_mutex_lock(&LOCK_instance);
if (!is_connected)
{
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;
}
mysql_close(&mysql);
pthread_mutex_unlock(&LOCK_instance);
return FALSE;
}
else if (!mysql_ping(&mysql))
{
pthread_mutex_unlock(&LOCK_instance);
return TRUE;
}
pthread_mutex_unlock(&LOCK_instance);
return FALSE;
}
/*
Stop an instance.
SYNOPSYS
stop()
RETURN:
0 ok
ER_INSTANCE_IS_NOT_STARTED Looks like the instance it is not started
ER_STOP_INSTANCE mysql_shutdown reported an error
*/
int Instance::stop()
{
if (is_running())
{
if (mysql_shutdown(&mysql, SHUTDOWN_DEFAULT))
goto err;
mysql_close(&mysql);
is_connected= FALSE;
return 0;
}
return ER_INSTANCE_IS_NOT_STARTED;
err:
return ER_STOP_INSTANCE;
}
/*
We execute this function to initialize instance parameters.
Return value: 0 - ok. 1 - unable to init DYNAMIC_ARRAY.
*/
int Instance::init(const char *name_arg)
{
pthread_mutex_init(&LOCK_instance, 0);
return options.init(name_arg);
}
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