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 * $FreeBSD: src/lib/libc/gen/daemon.c,v 1.3 2000/01/27 23:06:14 jasone Exp $ 34 * $DragonFly: src/lib/libc/gen/daemon.c,v 1.3 2005/01/31 22:29:15 dillon Exp $ 35 * 36 * @(#)daemon.c 8.1 (Berkeley) 6/4/93 37 */ 38 39 #include "namespace.h" 40 #include <fcntl.h> 41 #include <paths.h> 42 #include <unistd.h> 43 #include "un-namespace.h" 44 45 int 46 daemon(nochdir, noclose) 47 int nochdir, noclose; 48 { 49 int fd; 50 51 switch (fork()) { 52 case -1: 53 return (-1); 54 case 0: 55 break; 56 default: 57 _exit(0); 58 } 59 60 if (setsid() == -1) 61 return (-1); 62 63 if (!nochdir) 64 (void)chdir("/"); 65 66 if (!noclose && (fd = _open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 67 (void)_dup2(fd, STDIN_FILENO); 68 (void)_dup2(fd, STDOUT_FILENO); 69 (void)_dup2(fd, STDERR_FILENO); 70 if (fd > 2) 71 (void)_close(fd); 72 } 73 return (0); 74 } 75