1*9e66e6d7Sabs /* $NetBSD: daemon.c,v 1.10 2012/06/25 22:32:43 abs Exp $ */
26e6a4e85Scgd
361f28255Scgd /*-
46e6a4e85Scgd * Copyright (c) 1990, 1993
56e6a4e85Scgd * The Regents of the University of California. All rights reserved.
661f28255Scgd *
761f28255Scgd * Redistribution and use in source and binary forms, with or without
861f28255Scgd * modification, are permitted provided that the following conditions
961f28255Scgd * are met:
1061f28255Scgd * 1. Redistributions of source code must retain the above copyright
1161f28255Scgd * notice, this list of conditions and the following disclaimer.
1261f28255Scgd * 2. Redistributions in binary form must reproduce the above copyright
1361f28255Scgd * notice, this list of conditions and the following disclaimer in the
1461f28255Scgd * documentation and/or other materials provided with the distribution.
15eb7c1594Sagc * 3. Neither the name of the University nor the names of its contributors
1661f28255Scgd * may be used to endorse or promote products derived from this software
1761f28255Scgd * without specific prior written permission.
1861f28255Scgd *
1961f28255Scgd * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
2061f28255Scgd * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
2161f28255Scgd * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
2261f28255Scgd * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
2361f28255Scgd * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
2461f28255Scgd * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
2561f28255Scgd * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
2661f28255Scgd * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
2761f28255Scgd * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
2861f28255Scgd * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
2961f28255Scgd * SUCH DAMAGE.
3061f28255Scgd */
3161f28255Scgd
3229189e2bSchristos #include <sys/cdefs.h>
3361f28255Scgd #if defined(LIBC_SCCS) && !defined(lint)
346e6a4e85Scgd #if 0
356e6a4e85Scgd static char sccsid[] = "@(#)daemon.c 8.1 (Berkeley) 6/4/93";
366e6a4e85Scgd #else
37*9e66e6d7Sabs __RCSID("$NetBSD: daemon.c,v 1.10 2012/06/25 22:32:43 abs Exp $");
386e6a4e85Scgd #endif
3961f28255Scgd #endif /* LIBC_SCCS and not lint */
4061f28255Scgd
4143fa6fe3Sjtc #include "namespace.h"
426e6a4e85Scgd #include <fcntl.h>
4361f28255Scgd #include <paths.h>
4429189e2bSchristos #include <stdlib.h>
45d77864a2Skleink #include <unistd.h>
4661f28255Scgd
4743fa6fe3Sjtc #ifdef __weak_alias
__weak_alias(daemon,_daemon)4860549036Smycroft __weak_alias(daemon,_daemon)
4943fa6fe3Sjtc #endif
5043fa6fe3Sjtc
516e6a4e85Scgd int
52*9e66e6d7Sabs daemon(int nochdir, int noclose)
5361f28255Scgd {
546e6a4e85Scgd int fd;
5561f28255Scgd
566e6a4e85Scgd switch (fork()) {
576e6a4e85Scgd case -1:
5861f28255Scgd return (-1);
596e6a4e85Scgd case 0:
606e6a4e85Scgd break;
616e6a4e85Scgd default:
626e6a4e85Scgd _exit(0);
636e6a4e85Scgd }
646e6a4e85Scgd
656e6a4e85Scgd if (setsid() == -1)
666e6a4e85Scgd return (-1);
676e6a4e85Scgd
6861f28255Scgd if (!nochdir)
6961f28255Scgd (void)chdir("/");
7061f28255Scgd
716e6a4e85Scgd if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
726e6a4e85Scgd (void)dup2(fd, STDIN_FILENO);
736e6a4e85Scgd (void)dup2(fd, STDOUT_FILENO);
746e6a4e85Scgd (void)dup2(fd, STDERR_FILENO);
75d77864a2Skleink if (fd > STDERR_FILENO)
766e6a4e85Scgd (void)close(fd);
7761f28255Scgd }
7847b4886aSpk return (0);
7961f28255Scgd }
80