source:
MondoRescue/branches/2.2.9/mindi-busybox/libbb/pidfile.c@
3834
Last change on this file since 3834 was 3320, checked in by , 10 years ago | |
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File size: 893 bytes |
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[3320] | 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 source tree. | |
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 | } |
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