daemon.c
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上传日期:2007-01-04
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- /* $Id: daemon.c,v 1.3 1999/05/13 16:35:55 karls Exp $ */
- #ifdef HAVE_CONFIG_H
- #include "autoconf.h"
- #endif /* HAVE_CONFIG_H */
- #include "common.h"
- #if !HAVE_DAEMON
- /*-
- * Copyright (c) 1990, 1993
- * The Regents of the University of California. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
- #if defined(LIBC_SCCS) && !defined(lint)
- static char rcsid[] = "$OpenBSD: daemon.c,v 1.2 1996/08/19 08:22:13 tholo Exp $";
- #endif /* LIBC_SCCS and not lint */
- #include <fcntl.h>
- /*#include <paths.h>*/
- #if HAVE_UNISTD_H
- #include <unistd.h>
- #endif /* HAVE_UNISTD_H */
- int
- daemon(nochdir, noclose)
- int nochdir, noclose;
- {
- int fd;
- switch (fork()) {
- case -1:
- return (-1);
- case 0:
- break;
- default:
- _exit(0);
- }
- if (setsid() == -1)
- return (-1);
- if (!nochdir)
- (void)chdir("/");
- /*XXX /dev/null */
- if (!noclose && (fd = open("/dev/null", O_RDWR, 0)) != -1) {
- (void)dup2(fd, STDIN_FILENO);
- (void)dup2(fd, STDOUT_FILENO);
- (void)dup2(fd, STDERR_FILENO);
- if (fd > 2)
- (void)close (fd);
- }
- return (0);
- }
- #else
- static void avoid_error __P((void));
- static void avoid_error()
- {
- avoid_error();
- }
- #endif /* !HAVE_DAEMON */