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/* pidfile.c
* A module of J-Pilot http://jpilot.org
*
* Copyright (C) 2005 by Jason Day
*
* 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; version 2 of the License.
*
* 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 "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <signal.h>
#include "log.h"
#include "utils.h"
#define JPILOT_PIDFILE "jpilot.pid"
static char pidfile[FILENAME_MAX];
void setup_pidfile(void)
{
bzero (pidfile, FILENAME_MAX);
get_home_file_name (JPILOT_PIDFILE, pidfile, FILENAME_MAX);
}
pid_t check_for_jpilot(void)
{
FILE *pidfp;
int pid;
pid = 0;
if ((pidfp = fopen (pidfile, "r")) != NULL) {
fscanf (pidfp, "%d", &pid);
if (kill (pid, 0) == -1) {
jp_logf (JP_LOG_WARN, "removing stale pidfile\n");
pid = 0;
unlink (pidfile);
}
fclose (pidfp);
}
return pid;
}
void write_pid(void)
{
char tmp[20];
int fd;
#ifndef O_SYNC
#define O_SYNC 0 /* use it if we have it */
#endif
jp_logf (JP_LOG_DEBUG, "pidfile: %s\n", pidfile);
if ((fd = open (pidfile, O_WRONLY|O_CREAT|O_EXCL|O_SYNC, S_IRUSR|S_IWUSR)) != -1)
{
g_snprintf (tmp, sizeof(tmp), "%d\n", getpid());
write (fd, tmp, strlen (tmp));
close (fd);
}
else {
jp_logf (JP_LOG_FATAL, "create pidfile failed: %s\n", strerror(errno));
jp_logf (JP_LOG_WARN, "Warning: hotplug syncing disabled.\n");
}
}
void cleanup_pidfile(void)
{
if (getpid() == check_for_jpilot())
unlink (pidfile);
}
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