1 /* -*- mode: c; c-file-style: "bsd"; indent-tabs-mode: t -*- */
2 /*
3 * Copyright (c) 1990 The Regents of the University of California.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. All advertising materials mentioning features or use of this software
15 * must display the following acknowledgement:
16 * This product includes software developed by the University of
17 * California, Berkeley and its contributors.
18 * 4. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35 #include "k5-int.h"
36 #include <fcntl.h>
37 #include <sys/types.h>
38 #include <sys/file.h>
39 #include <unistd.h>
40 #ifdef HAVE_PATHS_H
41 #include <paths.h>
42 #endif
43
44 #ifndef _PATH_DEVNULL
45 #define _PATH_DEVNULL "/dev/null"
46 #endif
47
48 int
daemon(nochdir,noclose)49 daemon(nochdir, noclose)
50 int nochdir, noclose;
51 {
52 int cpid;
53
54 if ((cpid = fork()) == -1)
55 return (-1);
56 if (cpid)
57 exit(0);
58 #ifdef HAVE_SETSID
59 (void) setsid();
60 #else
61 #ifndef TIOCNOTTY
62 setpgrp();
63 #else
64 {
65 int n;
66
67 /*
68 * The open below may hang on pseudo ttys if the person
69 * who starts named logs out before this point. Thus,
70 * the need for the timer.
71 */
72 alarm(120);
73 n = open("/dev/tty", O_RDWR);
74 alarm(0);
75 if (n > 0) {
76 (void) ioctl(n, TIOCNOTTY, (char *)NULL);
77 (void) close(n);
78 }
79 }
80 #endif
81 #endif
82 if (!nochdir)
83 (void) chdir("/");
84 if (!noclose) {
85 int devnull = open(_PATH_DEVNULL, O_RDWR, 0);
86
87 if (devnull != -1) {
88 (void) dup2(devnull, 0);
89 (void) dup2(devnull, 1);
90 (void) dup2(devnull, 2);
91 if (devnull > 2)
92 (void) close(devnull);
93 }
94 }
95 return (0);
96 }
97