text: /* Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You 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;
  
      if (chdir("/") == -1) {
          return errno;
      }
  
  #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
  
  