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-rw-r--r--threadproc/unix/procsup.c104
1 files changed, 104 insertions, 0 deletions
diff --git a/threadproc/unix/procsup.c b/threadproc/unix/procsup.c
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+/* 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)
+{
+ 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) {
+ int x;
+
+ 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
+