source: branches/stable/mindi-busybox/networking/udhcp/pidfile.c @ 821

Last change on this file since 821 was 821, checked in by Bruno Cornec, 14 years ago

Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)

File size: 1.7 KB
Line 
1/* pidfile.c
2 *
3 * Functions to assist in the writing and removing of pidfiles.
4 *
5 * Russ Dill <Russ.Dill@asu.edu> September 2001
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 */
21
22#include <sys/types.h>
23#include <sys/stat.h>
24#include <fcntl.h>
25#include <unistd.h>
26#include <stdio.h>
27#include <stdlib.h>
28
29#include "common.h"
30#include "pidfile.h"
31
32static char *saved_pidfile;
33
34static void pidfile_delete(void)
35{
36    if (saved_pidfile) unlink(saved_pidfile);
37}
38
39
40int pidfile_acquire(const char *pidfile)
41{
42    int pid_fd;
43    if (!pidfile) return -1;
44
45    pid_fd = open(pidfile, O_CREAT | O_WRONLY, 0644);
46    if (pid_fd < 0) {
47        LOG(LOG_ERR, "Unable to open pidfile %s: %m\n", pidfile);
48    } else {
49        lockf(pid_fd, F_LOCK, 0);
50        if (!saved_pidfile)
51            atexit(pidfile_delete);
52        saved_pidfile = (char *) pidfile;
53    }
54
55    return pid_fd;
56}
57
58
59void pidfile_write_release(int pid_fd)
60{
61    FILE *out;
62
63    if (pid_fd < 0) return;
64
65    if ((out = fdopen(pid_fd, "w")) != NULL) {
66        fprintf(out, "%d\n", getpid());
67        fclose(out);
68    }
69    lockf(pid_fd, F_UNLCK, 0);
70    close(pid_fd);
71}
72
73
74
75
Note: See TracBrowser for help on using the repository browser.