Contents of /tags/mkinitrd-6_2_1/busybox/libbb/pidfile.c
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Sun May 30 12:16:23 2010 UTC (14 years, 4 months ago) by niro
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Sun May 30 12:16:23 2010 UTC (14 years, 4 months ago) by niro
File MIME type: text/plain
File size: 901 byte(s)
tagged 'mkinitrd-6_2_1'
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 | |
14 | smallint wrote_pidfile; |
15 | |
16 | void FAST_FUNC 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 | } |