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/*
* This file is part of libdaemon.
*
* libdaemon 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.
*
* libdaemon 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 libdaemon; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "dpid.h"
#include "dlog.h"
#define VARRUN "/var/run"
const char *daemon_pid_file_ident = 0;
daemon_pid_file_proc_t daemon_pid_file_proc = daemon_pid_file_proc_default;
const char *daemon_pid_file_proc_default(void) {
static char fn[PATH_MAX];
snprintf(fn, sizeof(fn), "%s/%s.pid", VARRUN, daemon_pid_file_ident ? daemon_pid_file_ident : "unknown");
return fn;
}
pid_t daemon_pid_file_is_running(void) {
const char *fn;
static char txt[256];
FILE *f;
pid_t pid;
if (!(fn = daemon_pid_file_proc()))
return (pid_t) -1;
if (!(f = fopen(fn, "r")))
return (pid_t) -1;
if (!(fgets(txt, sizeof(txt), f))) {
daemon_log(LOG_WARNING, "PID file corrupt, removing. (%s)", fn);
unlink(fn);
fclose(f);
return (pid_t) -1;
}
fclose(f);
if ((pid = (pid_t) atoi(txt)) <= 0) {
daemon_log(LOG_WARNING, "PID file corrupt, removing. (%s)", fn);
unlink(fn);
return (pid_t) -1;
}
if (kill(pid, 0) != 0 && errno != EPERM) {
daemon_log(LOG_WARNING, "Daemon %u killed: %s; removing PID file. (%s)", pid, strerror(errno), fn);
unlink(fn);
return (pid_t) -1;
}
return pid;
}
int daemon_pid_file_kill(int s) {
pid_t pid;
if ((pid = daemon_pid_file_is_running()) < 0)
return -1;
if (kill(pid, s) < 0)
return -1;
return 0;
}
int daemon_pid_file_create(void) {
const char *fn;
FILE *f;
mode_t save;
if (!(fn = daemon_pid_file_proc()))
return -1;
save = umask(022);
if (!(f = fopen(fn, "w")))
return -1;
fprintf(f, "%u\n", getpid());
fclose(f);
umask(save);
return 0;
}
int daemon_pid_file_remove(void) {
const char *fn;
if (!(fn = daemon_pid_file_proc()))
return -1;
if (unlink(fn) < 0)
return -1;
return 0;
}
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