1 /* $Header: /cvsroot/wikipedia/willow/src/bin/willow/daemon.c,v 1.1 2005/05/02 19:15:21 kateturner Exp $ */ 2 /* $NetBSD: daemon.c,v 1.9 2003/08/07 16:42:46 agc Exp $ */ 3 /*- 4 * Copyright (c) 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #if defined __SUNPRO_C || defined __DECC || defined __HP_cc 33 # pragma ident "@(#)$Header: /cvsroot/wikipedia/willow/src/bin/willow/daemon.c,v 1.1 2005/05/02 19:15:21 kateturner Exp $" 34 # pragma ident "$NetBSD: daemon.c,v 1.9 2003/08/07 16:42:46 agc Exp $" 35 #endif 36 37 #include <fcntl.h> 38 #include <stdlib.h> 39 #include <unistd.h> 40 41 int daemon(int nochdir, int noclose) 42 { 43 int fd; 44 45 switch (fork()) { 46 case -1: 47 return (-1); 48 case 0: 49 break; 50 default: 51 _exit(EXIT_SUCCESS); 52 } 53 54 if (setsid() == -1) 55 return (-1); 56 57 if (nochdir == 0) 58 (void)chdir("/"); 59 60 if (noclose == 0 && (fd = open("/dev/null", O_RDWR, 0)) != -1) { 61 (void)dup2(fd, STDIN_FILENO); 62 (void)dup2(fd, STDOUT_FILENO); 63 (void)dup2(fd, STDERR_FILENO); 64 if (fd > STDERR_FILENO) 65 (void)close(fd); 66 } 67 return (0); 68 } 69