/* Copyright 2000-2005 The Apache Software Foundation or its licensors, as * applicable. * * 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_status_t apr_proc_detach(int daemonize){#if 0    int x;    pid_t pgrp;    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 ((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#if APR_HAVE_SETSID    if ((pgrp = setsid()) == -1) {        return errno;    }#elif defined(NEXT) || defined(NEWSOS)    if (setpgrp(0, getpid()) == -1 || (pgrp = getpgrp(0)) == -1) {        return errno;    }#elif defined(OS2) || defined(TPF)    /* OS/2 don't support process group IDs */    pgrp = getpid();#elif defined(MPE)    /* MPE uses negative pid for process group */    pgrp = -getpid();#else    if ((pgrp = 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;    }#endif    return APR_SUCCESS;}#if 0#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#endif