1 /*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * 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 34 #if defined(LIBC_SCCS) && !defined(lint) 35 /*static char sccsid[] = "from: @(#)daemon.c 5.3 (Berkeley) 12/28/90";*/ 36 static char rcsid[] = "$Id: daemon.c,v 1.3 1993/12/19 08:44:42 pk Exp $"; 37 #endif /* LIBC_SCCS and not lint */ 38 39 #include <sys/fcntl.h> 40 #include <unistd.h> 41 #include <paths.h> 42 43 daemon(nochdir, noclose) 44 int nochdir, noclose; 45 { 46 int cpid; 47 48 if ((cpid = fork()) == -1) 49 return (-1); 50 if (cpid) 51 exit(0); 52 (void) setsid(); 53 if (!nochdir) 54 (void) chdir("/"); 55 if (!noclose) { 56 int devnull = open(_PATH_DEVNULL, O_RDWR, 0); 57 58 if (devnull != -1) { 59 (void) dup2(devnull, STDIN_FILENO); 60 (void) dup2(devnull, STDOUT_FILENO); 61 (void) dup2(devnull, STDERR_FILENO); 62 if (devnull > 2) 63 (void) close(devnull); 64 } 65 } 66 return (0); 67 } 68