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
write_pidfile(const char * path)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 }
41
write_pidfile_std_path_and_ext(const char * name)42 void FAST_FUNC write_pidfile_std_path_and_ext(const char *name)
43 {
44 char buf[sizeof(CONFIG_PID_FILE_PATH) + 64];
45
46 snprintf(buf, sizeof(buf), CONFIG_PID_FILE_PATH"/%s.pid", name);
47 write_pidfile(buf);
48 }
49
remove_pidfile_std_path_and_ext(const char * name)50 void FAST_FUNC remove_pidfile_std_path_and_ext(const char *name)
51 {
52 char buf[sizeof(CONFIG_PID_FILE_PATH) + 64];
53
54 if (!wrote_pidfile)
55 return;
56 snprintf(buf, sizeof(buf), CONFIG_PID_FILE_PATH"/%s.pid", name);
57 unlink(buf);
58 }
59