crypto/heimdal-0.6.3/lib/roken/daemon.c

   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  * 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 #if defined(LIBC_SCCS) && !defined(lint)
  35 static char sccsid[] = "@(#)daemon.c    8.1 (Berkeley) 6/4/93";
  36 #endif /* LIBC_SCCS and not lint */
  37
  38 #ifdef HAVE_CONFIG_H
  39 #include <config.h>
  40 #endif
  41
  42 RCSID("$Id: daemon.c,v 1.3 1997/10/04 21:55:48 joda Exp $");
  43
  44 #ifndef HAVE_DAEMON
  45
  46 #ifdef HAVE_FCNTL_H
  47 #include <fcntl.h>
  48 #endif
  49 #ifdef HAVE_PATHS_H
  50 #include <paths.h>
  51 #endif
  52 #ifdef HAVE_UNISTD_H
  53 #include <unistd.h>
  54 #endif
  55
  56 #include "roken.h"
  57
  58 int
  59 daemon(int nochdir, int noclose)
  60 {
  61     int fd;
  62
  63     switch (fork()) {
  64     case -1:
  65         return (-1);
  66     case 0:
  67         break;
  68     default:
  69         _exit(0);
  70     }
  71
  72     if (setsid() == -1)
  73         return (-1);
  74
  75     if (!nochdir)
  76         chdir("/");
  77
  78     if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
  79         dup2(fd, STDIN_FILENO);
  80         dup2(fd, STDOUT_FILENO);
  81         dup2(fd, STDERR_FILENO);
  82         if (fd > 2)
  83             close (fd);
  84     }
  85     return (0);
  86 }
  87
  88 #endif /* HAVE_DAEMON */