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28f540f4 RM |
1 | /*- |
2 | * Copyright (c) 1990, 1993 | |
3 | * The Regents of the University of California. All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
28f540f4 RM |
13 | * 4. Neither the name of the University nor the names of its contributors |
14 | * may be used to endorse or promote products derived from this software | |
15 | * without specific prior written permission. | |
16 | * | |
17 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
27 | * SUCH DAMAGE. | |
28 | */ | |
29 | ||
30 | #if defined(LIBC_SCCS) && !defined(lint) | |
31 | static char sccsid[] = "@(#)daemon.c 8.1 (Berkeley) 6/4/93"; | |
32 | #endif /* LIBC_SCCS and not lint */ | |
33 | ||
34 | #include <fcntl.h> | |
35 | #include <paths.h> | |
36 | #include <unistd.h> | |
316ca440 UD |
37 | #include <sys/stat.h> |
38 | ||
39 | #include <device-nrs.h> | |
28f540f4 RM |
40 | |
41 | int | |
42 | daemon(nochdir, noclose) | |
43 | int nochdir, noclose; | |
44 | { | |
45 | int fd; | |
46 | ||
0bb258e3 | 47 | switch (__fork()) { |
28f540f4 RM |
48 | case -1: |
49 | return (-1); | |
50 | case 0: | |
51 | break; | |
52 | default: | |
53 | _exit(0); | |
54 | } | |
55 | ||
50304ef0 | 56 | if (__setsid() == -1) |
28f540f4 RM |
57 | return (-1); |
58 | ||
59 | if (!nochdir) | |
50304ef0 | 60 | (void)__chdir("/"); |
28f540f4 | 61 | |
50304ef0 | 62 | if (!noclose && (fd = __open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { |
316ca440 UD |
63 | struct stat64 st; |
64 | ||
65 | if (__builtin_expect (__fxstat64 (_STAT_VER, fd, &st), 0) == 0 | |
66 | && __builtin_expect (S_ISCHR (st.st_mode), 1) != 0 | |
67 | #if defined DEV_NULL_MAJOR && defined DEV_NULL_MINOR | |
68 | && st.st_rdev == makedev (DEV_NULL_MAJOR, DEV_NULL_MINOR) | |
69 | #endif | |
70 | ) { | |
71 | (void)__dup2(fd, STDIN_FILENO); | |
72 | (void)__dup2(fd, STDOUT_FILENO); | |
73 | (void)__dup2(fd, STDERR_FILENO); | |
74 | if (fd > 2) | |
75 | (void)__close (fd); | |
76 | } else { | |
50304ef0 | 77 | (void)__close (fd); |
316ca440 UD |
78 | return -1; |
79 | } | |
28f540f4 RM |
80 | } |
81 | return (0); | |
82 | } |