daemon.c revision 71579
11573Srgrimes/*- 21573Srgrimes * Copyright (c) 1990, 1993 31573Srgrimes * The Regents of the University of California. All rights reserved. 41573Srgrimes * 51573Srgrimes * Redistribution and use in source and binary forms, with or without 61573Srgrimes * modification, are permitted provided that the following conditions 71573Srgrimes * are met: 81573Srgrimes * 1. Redistributions of source code must retain the above copyright 91573Srgrimes * notice, this list of conditions and the following disclaimer. 101573Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 111573Srgrimes * notice, this list of conditions and the following disclaimer in the 121573Srgrimes * documentation and/or other materials provided with the distribution. 131573Srgrimes * 3. All advertising materials mentioning features or use of this software 141573Srgrimes * must display the following acknowledgement: 151573Srgrimes * This product includes software developed by the University of 161573Srgrimes * California, Berkeley and its contributors. 171573Srgrimes * 4. Neither the name of the University nor the names of its contributors 181573Srgrimes * may be used to endorse or promote products derived from this software 191573Srgrimes * without specific prior written permission. 201573Srgrimes * 211573Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 221573Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 231573Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 241573Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 251573Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 261573Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 271573Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 281573Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 291573Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 301573Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 311573Srgrimes * SUCH DAMAGE. 3255837Sjasone * 3355837Sjasone * $FreeBSD: head/lib/libc/gen/daemon.c 71579 2001-01-24 13:01:12Z deischen $ 341573Srgrimes */ 351573Srgrimes 361573Srgrimes#if defined(LIBC_SCCS) && !defined(lint) 371573Srgrimesstatic char sccsid[] = "@(#)daemon.c 8.1 (Berkeley) 6/4/93"; 381573Srgrimes#endif /* LIBC_SCCS and not lint */ 391573Srgrimes 4071579Sdeischen#include "namespace.h" 411573Srgrimes#include <fcntl.h> 421573Srgrimes#include <paths.h> 431573Srgrimes#include <unistd.h> 4471579Sdeischen#include "un-namespace.h" 451573Srgrimes 461573Srgrimesint 471573Srgrimesdaemon(nochdir, noclose) 481573Srgrimes int nochdir, noclose; 491573Srgrimes{ 501573Srgrimes int fd; 511573Srgrimes 521573Srgrimes switch (fork()) { 531573Srgrimes case -1: 541573Srgrimes return (-1); 551573Srgrimes case 0: 561573Srgrimes break; 571573Srgrimes default: 581573Srgrimes _exit(0); 591573Srgrimes } 601573Srgrimes 611573Srgrimes if (setsid() == -1) 621573Srgrimes return (-1); 631573Srgrimes 641573Srgrimes if (!nochdir) 651573Srgrimes (void)chdir("/"); 661573Srgrimes 6756698Sjasone if (!noclose && (fd = _open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 6871579Sdeischen (void)_dup2(fd, STDIN_FILENO); 6971579Sdeischen (void)_dup2(fd, STDOUT_FILENO); 7071579Sdeischen (void)_dup2(fd, STDERR_FILENO); 711573Srgrimes if (fd > 2) 7256698Sjasone (void)_close(fd); 731573Srgrimes } 741573Srgrimes return (0); 751573Srgrimes} 76