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      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 1.2 2005/04/27 04:56:10 sra 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
     80 
     81 /*! \file */
     82