1 /* vi: set sw=4 ts=4: */
4 * Functions to assist in the writing and removing of pidfiles.
6 * Russ Dill <Russ.Dill@asu.edu> September 2001
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 #include <sys/types.h>
33 static char *saved_pidfile;
35 static void pidfile_delete(void)
37 if (saved_pidfile) unlink(saved_pidfile);
41 int pidfile_acquire(const char *pidfile)
44 if (!pidfile) return -1;
46 pid_fd = open(pidfile, O_CREAT | O_WRONLY, 0644);
48 bb_perror_msg("Unable to open pidfile %s", pidfile);
50 lockf(pid_fd, F_LOCK, 0);
52 atexit(pidfile_delete);
53 saved_pidfile = (char *) pidfile;
60 void pidfile_write_release(int pid_fd)
64 if (pid_fd < 0) return;
66 if ((out = fdopen(pid_fd, "w")) != NULL) {
67 fprintf(out, "%d\n", getpid());
70 lockf(pid_fd, F_UNLCK, 0);