105 lines
3.2 KiB
C
105 lines
3.2 KiB
C
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/* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "apr_arch_threadproc.h"
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APR_DECLARE(apr_status_t) apr_proc_detach(int daemonize)
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{
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if (chdir("/") == -1) {
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return errno;
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}
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#if !defined(MPE) && !defined(OS2) && !defined(TPF) && !defined(BEOS)
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/* Don't detach for MPE because child processes can't survive the death of
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* the parent. */
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if (daemonize) {
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int x;
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if ((x = fork()) > 0) {
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exit(0);
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}
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else if (x == -1) {
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perror("fork");
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fprintf(stderr, "unable to fork new process\n");
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exit(1); /* we can't do anything here, so just exit. */
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}
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/* RAISE_SIGSTOP(DETACH); */
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}
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#endif
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#ifdef HAVE_SETSID
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/* A setsid() failure is not fatal if we didn't just fork().
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* The calling process may be the process group leader, in
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* which case setsid() will fail with EPERM.
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*/
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if (setsid() == -1 && daemonize) {
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return errno;
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}
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#elif defined(NEXT) || defined(NEWSOS)
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if (setpgrp(0, getpid()) == -1) {
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return errno;
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}
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#elif defined(OS2) || defined(TPF) || defined(MPE)
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/* do nothing */
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#else
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if (setpgid(0, 0) == -1) {
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return errno;
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}
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#endif
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/* close out the standard file descriptors */
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if (freopen("/dev/null", "r", stdin) == NULL) {
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return errno;
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/* continue anyhow -- note we can't close out descriptor 0 because we
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* have nothing to replace it with, and if we didn't have a descriptor
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* 0 the next file would be created with that value ... leading to
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* havoc.
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*/
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}
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if (freopen("/dev/null", "w", stdout) == NULL) {
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return errno;
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}
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/* We are going to reopen this again in a little while to the error
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* log file, but better to do it twice and suffer a small performance
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* hit for consistancy than not reopen it here.
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*/
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if (freopen("/dev/null", "w", stderr) == NULL) {
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return errno;
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}
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return APR_SUCCESS;
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}
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#if (!HAVE_WAITPID)
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/* From ikluft@amdahl.com
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* this is not ideal but it works for SVR3 variants
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* Modified by dwd@bell-labs.com to call wait3 instead of wait because
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* apache started to use the WNOHANG option.
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*/
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int waitpid(pid_t pid, int *statusp, int options)
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{
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int tmp_pid;
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if (kill(pid, 0) == -1) {
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errno = ECHILD;
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return -1;
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}
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while (((tmp_pid = wait3(statusp, options, 0)) != pid) &&
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(tmp_pid != -1) && (tmp_pid != 0) && (pid != -1))
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;
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return tmp_pid;
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}
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#endif
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