mirror of
https://github.com/topjohnwu/ndk-busybox.git
synced 2024-12-14 07:18:29 +00:00
77 lines
1.7 KiB
C
77 lines
1.7 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/* pidfile.c
|
|
*
|
|
* Functions to assist in the writing and removing of pidfiles.
|
|
*
|
|
* Russ Dill <Russ.Dill@asu.edu> September 2001
|
|
*
|
|
* 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 <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <fcntl.h>
|
|
#include <unistd.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
|
|
#include "common.h"
|
|
#include "pidfile.h"
|
|
|
|
static char *saved_pidfile;
|
|
|
|
static void pidfile_delete(void)
|
|
{
|
|
if (saved_pidfile) unlink(saved_pidfile);
|
|
}
|
|
|
|
|
|
int pidfile_acquire(const char *pidfile)
|
|
{
|
|
int pid_fd;
|
|
if (!pidfile) return -1;
|
|
|
|
pid_fd = open(pidfile, O_CREAT | O_WRONLY, 0644);
|
|
if (pid_fd < 0) {
|
|
LOG(LOG_ERR, "Unable to open pidfile %s: %m\n", pidfile);
|
|
} else {
|
|
lockf(pid_fd, F_LOCK, 0);
|
|
if (!saved_pidfile)
|
|
atexit(pidfile_delete);
|
|
saved_pidfile = (char *) pidfile;
|
|
}
|
|
|
|
return pid_fd;
|
|
}
|
|
|
|
|
|
void pidfile_write_release(int pid_fd)
|
|
{
|
|
FILE *out;
|
|
|
|
if (pid_fd < 0) return;
|
|
|
|
if ((out = fdopen(pid_fd, "w")) != NULL) {
|
|
fprintf(out, "%d\n", getpid());
|
|
fclose(out);
|
|
}
|
|
lockf(pid_fd, F_UNLCK, 0);
|
|
close(pid_fd);
|
|
}
|
|
|
|
|
|
|
|
|