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/* Copyright 2000-2004 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "apr_arch_threadproc.h"
APR_DECLARE(apr_status_t) apr_proc_detach(int daemonize)
{
int x;
chdir("/");
#if !defined(MPE) && !defined(OS2) && !defined(TPF) && !defined(BEOS)
/* Don't detach for MPE because child processes can't survive the death of
* the parent. */
if (daemonize) {
if ((x = fork()) > 0) {
exit(0);
}
else if (x == -1) {
perror("fork");
fprintf(stderr, "unable to fork new process\n");
exit(1); /* we can't do anything here, so just exit. */
}
/* RAISE_SIGSTOP(DETACH); */
}
#endif
#ifdef HAVE_SETSID
/* A setsid() failure is not fatal if we didn't just fork().
* The calling process may be the process group leader, in
* which case setsid() will fail with EPERM.
*/
if (setsid() == -1 && daemonize) {
return errno;
}
#elif defined(NEXT) || defined(NEWSOS)
if (setpgrp(0, getpid()) == -1) {
return errno;
}
#elif defined(OS2) || defined(TPF) || defined(MPE)
/* do nothing */
#else
if (setpgid(0, 0) == -1) {
return errno;
}
#endif
/* close out the standard file descriptors */
if (freopen("/dev/null", "r", stdin) == NULL) {
return errno;
/* continue anyhow -- note we can't close out descriptor 0 because we
* have nothing to replace it with, and if we didn't have a descriptor
* 0 the next file would be created with that value ... leading to
* havoc.
*/
}
if (freopen("/dev/null", "w", stdout) == NULL) {
return errno;
}
/* We are going to reopen this again in a little while to the error
* log file, but better to do it twice and suffer a small performance
* hit for consistancy than not reopen it here.
*/
if (freopen("/dev/null", "w", stderr) == NULL) {
return errno;
}
return APR_SUCCESS;
}
#if (!HAVE_WAITPID)
/* From ikluft@amdahl.com
* this is not ideal but it works for SVR3 variants
* Modified by dwd@bell-labs.com to call wait3 instead of wait because
* apache started to use the WNOHANG option.
*/
int waitpid(pid_t pid, int *statusp, int options)
{
int tmp_pid;
if (kill(pid, 0) == -1) {
errno = ECHILD;
return -1;
}
while (((tmp_pid = wait3(statusp, options, 0)) != pid) &&
(tmp_pid != -1) && (tmp_pid != 0) && (pid != -1))
;
return tmp_pid;
}
#endif
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