1/* Licensed to the Apache Software Foundation (ASF) under one or more 2 * contributor license agreements. See the NOTICE file distributed with 3 * this work for additional information regarding copyright ownership. 4 * The ASF licenses this file to You under the Apache License, Version 2.0 5 * (the "License"); you may not use this file except in compliance with 6 * the License. You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#include "apr_arch_threadproc.h" 18 19APR_DECLARE(apr_status_t) apr_proc_detach(int daemonize) 20{ 21 if (chdir("/") == -1) { 22 return errno; 23 } 24 25#if !defined(MPE) && !defined(OS2) && !defined(TPF) && !defined(BEOS) 26 /* Don't detach for MPE because child processes can't survive the death of 27 * the parent. */ 28 if (daemonize) { 29 int x; 30 31 if ((x = fork()) > 0) { 32 exit(0); 33 } 34 else if (x == -1) { 35 perror("fork"); 36 fprintf(stderr, "unable to fork new process\n"); 37 exit(1); /* we can't do anything here, so just exit. */ 38 } 39 /* RAISE_SIGSTOP(DETACH); */ 40 } 41#endif 42 43#ifdef HAVE_SETSID 44 /* A setsid() failure is not fatal if we didn't just fork(). 45 * The calling process may be the process group leader, in 46 * which case setsid() will fail with EPERM. 47 */ 48 if (setsid() == -1 && daemonize) { 49 return errno; 50 } 51#elif defined(NEXT) || defined(NEWSOS) 52 if (setpgrp(0, getpid()) == -1) { 53 return errno; 54 } 55#elif defined(OS2) || defined(TPF) || defined(MPE) 56 /* do nothing */ 57#else 58 if (setpgid(0, 0) == -1) { 59 return errno; 60 } 61#endif 62 63 /* close out the standard file descriptors */ 64 if (freopen("/dev/null", "r", stdin) == NULL) { 65 return errno; 66 /* continue anyhow -- note we can't close out descriptor 0 because we 67 * have nothing to replace it with, and if we didn't have a descriptor 68 * 0 the next file would be created with that value ... leading to 69 * havoc. 70 */ 71 } 72 if (freopen("/dev/null", "w", stdout) == NULL) { 73 return errno; 74 } 75 /* We are going to reopen this again in a little while to the error 76 * log file, but better to do it twice and suffer a small performance 77 * hit for consistancy than not reopen it here. 78 */ 79 if (freopen("/dev/null", "w", stderr) == NULL) { 80 return errno; 81 } 82 return APR_SUCCESS; 83} 84 85#if (!HAVE_WAITPID) 86/* From ikluft@amdahl.com 87 * this is not ideal but it works for SVR3 variants 88 * Modified by dwd@bell-labs.com to call wait3 instead of wait because 89 * apache started to use the WNOHANG option. 90 */ 91int waitpid(pid_t pid, int *statusp, int options) 92{ 93 int tmp_pid; 94 if (kill(pid, 0) == -1) { 95 errno = ECHILD; 96 return -1; 97 } 98 while (((tmp_pid = wait3(statusp, options, 0)) != pid) && 99 (tmp_pid != -1) && (tmp_pid != 0) && (pid != -1)) 100 ; 101 return tmp_pid; 102} 103#endif 104 105