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