source: branches/2.2.5/mindi-busybox/libbb/pidfile.c @ 1765

Last change on this file since 1765 was 1765, checked in by Bruno Cornec, 13 years ago

Update to busybox 1.7.2

  • Property svn:eol-style set to native
File size: 891 bytes
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * pid file routines
4 *
5 * Copyright (C) 2007 by Stephane Billiart <stephane.billiart@gmail.com>
6 *
7 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
8 */
9
10/* Override ENABLE_FEATURE_PIDFILE */
11#define WANT_PIDFILE 1
12#include "libbb.h"
13
14smallint wrote_pidfile;
15
16void write_pidfile(const char *path)
17{
18    int pid_fd;
19    char *end;
20    char buf[sizeof(int)*3 + 2];
21    struct stat sb;
22
23    if (!path)
24        return;
25    /* we will overwrite stale pidfile */
26    pid_fd = open(path, O_WRONLY|O_CREAT|O_TRUNC, 0666);
27    if (pid_fd < 0)
28        return;
29
30    /* path can be "/dev/null"! Test for such cases */
31    wrote_pidfile = (fstat(pid_fd, &sb) == 0) && S_ISREG(sb.st_mode);
32
33    if (wrote_pidfile) {
34        /* few bytes larger, but doesn't use stdio */
35        end = utoa_to_buf(getpid(), buf, sizeof(buf));
36        *end = '\n';
37        full_write(pid_fd, buf, end - buf + 1);
38    }
39    close(pid_fd);
40}
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