source: subversion/applications/utils/mod_tile/daemon_compat.c @ 28681

Last change on this file since 28681 was 28681, checked in by apmon, 7 years ago

[renderd] Some operating systems don't have the "daemon" function

Include a compatibility version of the daemon function for these cases

File size: 2.5 KB
Line 
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.
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#include "config.h"
31#ifndef HAVE_DAEMON
32
33#include <sys/cdefs.h>
34
35#include <errno.h>
36#include <fcntl.h>
37#include <paths.h>
38#include <stdlib.h>
39#include <signal.h>
40#include <unistd.h>
41
42int
43daemon(nochdir, noclose)
44     int nochdir, noclose;
45{
46  struct sigaction osa, sa;
47  int fd;
48  pid_t newgrp;
49  int oerrno;
50  int osa_ok;
51
52  /* A SIGHUP may be thrown when the parent exits below. */
53  sigemptyset(&sa.sa_mask);
54  sa.sa_handler = SIG_IGN;
55  sa.sa_flags = 0;
56  osa_ok = sigaction(SIGHUP, &sa, &osa);
57
58  switch (fork()) {
59  case -1:
60    return (-1);
61  case 0:
62    break;
63  default:
64    exit(0);
65  }
66
67  newgrp = setsid();
68  oerrno = errno;
69  if (osa_ok != -1)
70    sigaction(SIGHUP, &osa, NULL);
71
72  if (newgrp == -1) {
73    errno = oerrno;
74    return (-1);
75  }
76
77  if (!nochdir)
78    (void)chdir("/");
79
80  if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
81    dup2(fd, STDIN_FILENO);
82    dup2(fd, STDOUT_FILENO);
83    dup2(fd, STDERR_FILENO);
84    if (fd > 2)
85      close(fd);
86  }
87  return (0);
88}
89#endif
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