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/*
** ZABBIX
** Copyright (C) 2000-2005 SIA Zabbix
**
** 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., 675 Mass Ave, Cambridge, MA 02139, USA.
**/
#include "common.h"
#include "pid.h"
#include "log.h"
#include "threads.h"
#include <sysinc.h>
static FILE *fpid = NULL;
static int fdpid = -1;
int create_pid_file(const char *pidfile)
{
struct stat buf;
int fd = 0;
#ifdef HAVE_FCNTL_H
struct flock fl;
fl.l_type = F_WRLCK; /* F_RDLCK, F_WRLCK, F_UNLCK */
fl.l_whence = SEEK_SET; /* SEEK_SET, SEEK_CUR, SEEK_END */
fl.l_start = 0; /* Offset from l_whence */
fl.l_len = 0; /* length, 0 = to EOF */
fl.l_pid = zbx_get_thread_id(); /* our PID */
#endif /* HAVE_FCNTL_H */
/* check if pid file already exists */
if(stat(pidfile,&buf) == 0)
{
#ifdef HAVE_FCNTL_H
if( -1 == (fd = open(pidfile, O_WRONLY | O_APPEND)))
#else
if( -1 == (fd = open(pidfile, O_APPEND)))
#endif /* HAVE_FCNTL_H */
{
zbx_error("Cannot open PID file [%s] [%s]", pidfile, strerror(errno));
zabbix_log( LOG_LEVEL_CRIT, "Cannot open PID file [%s] [%s]", pidfile, strerror(errno));
return FAIL;
}
#ifdef HAVE_FCNTL_H
if(-1 == fcntl(fd, F_SETLK, &fl) && EAGAIN == errno)
#else
if(-1 == flock(fd, LOCK_EX | LOCK_NB) && EWOULDBLOCK == errno)
#endif /* HAVE_FCNTL_H */
{
zbx_error("File [%s] exists and locked. Is this process already running ?", pidfile);
zabbix_log( LOG_LEVEL_CRIT, "File [%s] exists and locked. Is this process already running ?", pidfile);
return FAIL;
}
close(fd);
}
/* open pid file */
if( NULL == (fpid = fopen(pidfile, "w")))
{
zbx_error("Cannot create PID file [%s] [%s]", pidfile, strerror(errno));
zabbix_log( LOG_LEVEL_CRIT, "Cannot create PID file [%s] [%s]", pidfile, strerror(errno));
return FAIL;
}
/* lock file */
fdpid = fileno(fpid);
#ifdef HAVE_FCNTL_H
if(-1 != fdpid) fcntl(fdpid, F_SETLK, &fl);
#else
if(-1 != fdpid) flock(fdpid, LOCK_EX);
#endif /* HAVE_FCNTL_H */
/* frite pid to file */
fprintf(fpid, "%li", zbx_get_thread_id());
fflush(fpid);
return SUCCEED;
}
void drop_pid_file(const char *pidfile)
{
#ifdef HAVE_FCNTL_H
struct flock fl;
fl.l_type = F_UNLCK; /* tell it to unlock the region */
fl.l_whence = SEEK_SET; /* SEEK_SET, SEEK_CUR, SEEK_END */
fl.l_start = 0; /* Offset from l_whence */
fl.l_len = 0; /* length, 0 = to EOF */
fl.l_pid = zbx_get_thread_id(); /* our PID */
#endif /* HAVE_FCNTL_H */
/* unlock file */
#ifdef HAVE_FCNTL_H
if(-1 != fdpid) fcntl(fdpid, F_SETLK, &fl);
#else
if(-1 != fdpid) flock(fdpid, LOCK_UN);
#endif /* HAVE_FCNTL_H */
/* close pid file */
zbx_fclose(fpid);
if(-1 == unlink(pidfile))
{
zabbix_log( LOG_LEVEL_DEBUG, "Cannot remove PID file [%s] [%s]", pidfile, strerror(errno));
}
}
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