Include "libc-internal.h" for __get_clockfreq declaration.
[glibc.git] / misc / daemon.c
blob8cffdde1ce6cf5ab5febdd144a286e2b2322bfd3
1 /*-
2 * Copyright (c) 1990, 1993
3 * The Regents of the University of California. All rights reserved.
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.
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.
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.
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 */
34 #include <fcntl.h>
35 #include <paths.h>
36 #include <unistd.h>
37 #include <sys/stat.h>
39 #include <device-nrs.h>
41 int
42 daemon(nochdir, noclose)
43 int nochdir, noclose;
45 int fd;
47 switch (__fork()) {
48 case -1:
49 return (-1);
50 case 0:
51 break;
52 default:
53 _exit(0);
56 if (__setsid() == -1)
57 return (-1);
59 if (!nochdir)
60 (void)__chdir("/");
62 if (!noclose && (fd = __open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
63 struct stat64 st;
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 {
77 (void)__close (fd);
78 return -1;
81 return (0);