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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 | ||
2c008571 | 34 | #include <errno.h> |
28f540f4 RM |
35 | #include <fcntl.h> |
36 | #include <paths.h> | |
37 | #include <unistd.h> | |
316ca440 UD |
38 | #include <sys/stat.h> |
39 | ||
40 | #include <device-nrs.h> | |
2c008571 | 41 | #include <not-cancel.h> |
28f540f4 RM |
42 | |
43 | int | |
41075ae3 | 44 | daemon (int nochdir, int noclose) |
28f540f4 RM |
45 | { |
46 | int fd; | |
47 | ||
0bb258e3 | 48 | switch (__fork()) { |
28f540f4 RM |
49 | case -1: |
50 | return (-1); | |
51 | case 0: | |
52 | break; | |
53 | default: | |
54 | _exit(0); | |
55 | } | |
56 | ||
50304ef0 | 57 | if (__setsid() == -1) |
28f540f4 RM |
58 | return (-1); |
59 | ||
60 | if (!nochdir) | |
50304ef0 | 61 | (void)__chdir("/"); |
28f540f4 | 62 | |
51499423 | 63 | if (!noclose) { |
316ca440 UD |
64 | struct stat64 st; |
65 | ||
c2284574 | 66 | if ((fd = __open_nocancel(_PATH_DEVNULL, O_RDWR, 0)) != -1 |
51499423 UD |
67 | && (__builtin_expect (__fxstat64 (_STAT_VER, fd, &st), 0) |
68 | == 0)) { | |
267a7a9e | 69 | if (__builtin_expect (S_ISCHR (st.st_mode), 1) != 0 |
316ca440 | 70 | #if defined DEV_NULL_MAJOR && defined DEV_NULL_MINOR |
267a7a9e UD |
71 | && (st.st_rdev |
72 | == makedev (DEV_NULL_MAJOR, DEV_NULL_MINOR)) | |
316ca440 | 73 | #endif |
267a7a9e UD |
74 | ) { |
75 | (void)__dup2(fd, STDIN_FILENO); | |
76 | (void)__dup2(fd, STDOUT_FILENO); | |
77 | (void)__dup2(fd, STDERR_FILENO); | |
78 | if (fd > 2) | |
79 | (void)__close (fd); | |
80 | } else { | |
81 | /* We must set an errno value since no | |
82 | function call actually failed. */ | |
c181840c | 83 | __close_nocancel_nostatus (fd); |
267a7a9e UD |
84 | __set_errno (ENODEV); |
85 | return -1; | |
86 | } | |
316ca440 | 87 | } else { |
c181840c | 88 | __close_nocancel_nostatus (fd); |
316ca440 UD |
89 | return -1; |
90 | } | |
28f540f4 RM |
91 | } |
92 | return (0); | |
93 | } |