| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 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 | } |