contrib/bind-9.2.4rc7/lib/bind/bsd/daemon.c

   1 #if defined(LIBC_SCCS) && !defined(lint)
   2 static const char sccsid[] = "@(#)daemon.c      8.1 (Berkeley) 6/4/93";
   3 static const char rcsid[] = "$Id: daemon.c,v 1.1 2001/03/29 06:30:31 marka Exp $";
   4 #endif /* LIBC_SCCS and not lint */
   5
   6 /*
   7  * Copyright (c) 1990, 1993
   8  *      The Regents of the University of California.  All rights reserved.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. All advertising materials mentioning features or use of this software
  19  *    must display the following acknowledgement:
  20  *      This product includes software developed by the University of
  21  *      California, Berkeley and its contributors.
  22  * 4. Neither the name of the University nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  */
  38
  39 #include "port_before.h"
  40
  41 #include <fcntl.h>
  42 #include <paths.h>
  43 #include <unistd.h>
  44
  45 #include "port_after.h"
  46
  47 #ifndef NEED_DAEMON
  48 int __bind_daemon__;
  49 #else
  50
  51 int
  52 daemon(int nochdir, int noclose) {
  53         int fd;
  54
  55         switch (fork()) {
  56         case -1:
  57                 return (-1);
  58         case 0:
  59                 break;
  60         default:
  61                 _exit(0);
  62         }
  63
  64         if (setsid() == -1)
  65                 return (-1);
  66
  67         if (!nochdir)
  68                 (void)chdir("/");
  69
  70         if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
  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         }
  77         return (0);
  78 }
  79 #endif