1 files changed, 104 insertions, 0 deletions
diff --git a/threadproc/unix/procsup.c b/threadproc/unix/procsup.c
new file mode 100644
index 0000000..94177f9
--- /dev/null
+++ b/threadproc/unix/procsup.c
@@ -0,0 +1,104 @@
+/* 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
+