reorganize directories

[awesomized/libmemcached] / src / util / daemon.cc

diff --git a/src/util/daemon.cc b/src/util/daemon.cc
new file mode 100644 (file)
index 0000000..90e29ef
--- /dev/null
+++ b/src/util/daemon.cc
@@ -0,0 +1,194 @@
+/*    $Header: /cvsroot/wikipedia/willow/src/bin/willow/daemon.c,v 1.1 2005/05/02 19:15:21 kateturner Exp $    */
+/*    $NetBSD: daemon.c,v 1.9 2003/08/07 16:42:46 agc Exp $    */
+/*-
+ * Copyright (c) 1990, 1993
+ *    The Regents of the University of California.  All rights reserved.
+ * Copyright (c) 2010
+ *    Stewart Smith
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <mem_config.h>
+
+#if defined __SUNPRO_C || defined __DECC || defined __HP_cc
+# pragma ident "@(#)$Header: /cvsroot/wikipedia/willow/src/bin/willow/daemon.c,v 1.1 2005/05/02 19:15:21 kateturner Exp $"
+# pragma ident "$NetBSD: daemon.c,v 1.9 2003/08/07 16:42:46 agc Exp $"
+#endif
+
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <signal.h>
+#include <unistd.h>
+#include <sys/select.h>
+
+#include <util/daemon.hpp>
+
+#include <iostream>
+
+namespace datadifferential {
+namespace util {
+
+pid_t parent_pid;
+
+extern "C"
+{
+
+static void sigusr1_handler(int sig)
+{
+  if (sig == SIGUSR1)
+  {
+    _exit(EXIT_SUCCESS);
+  }
+}
+
+}
+
+bool daemon_is_ready(bool close_io)
+{
+  if (kill(parent_pid, SIGUSR1) == -1)
+  {
+    perror("kill");
+    return false;
+  }
+
+  if (close_io == false)
+  {
+    return true;;
+  }
+
+  int fd;
+  if ((fd = open("/dev/null", O_RDWR, 0)) < 0)
+  {
+    perror("open");
+    return false;
+  }
+  else
+  {
+    if (dup2(fd, STDIN_FILENO) < 0)
+    {
+      perror("dup2 stdin");
+      return false;
+    }
+
+    if (dup2(fd, STDOUT_FILENO) < 0)
+    {
+      perror("dup2 stdout");
+      return false;
+    }
+
+    if (dup2(fd, STDERR_FILENO) < 0)
+    {
+      perror("dup2 stderr");
+      return false;
+    }
+
+    if (fd > STDERR_FILENO)
+    {
+      if (close(fd) < 0)
+      {
+        perror("close");
+        return false;
+      }
+    }
+  }
+
+  return true;
+}
+
+#ifndef __INTEL_COMPILER
+#pragma GCC diagnostic ignored "-Wold-style-cast"
+#endif
+
+bool daemonize(bool is_chdir, bool wait_sigusr1)
+{
+  struct sigaction new_action;
+
+  new_action.sa_handler= sigusr1_handler;
+  sigemptyset(&new_action.sa_mask);
+  new_action.sa_flags= 0;
+  sigaction(SIGUSR1, &new_action, NULL);
+
+  parent_pid= getpid();
+
+  pid_t child= fork();
+
+  switch (child)
+  {
+  case -1:
+    return false;
+
+  case 0:
+    break;
+
+  default:
+    if (wait_sigusr1)
+    {
+      /* parent */
+      int exit_code= EXIT_FAILURE;
+      int status;
+      while (waitpid(child, &status, 0) != child)
+      { }
+
+      if (WIFEXITED(status))
+      {
+        exit_code= WEXITSTATUS(status);
+      }
+      if (WIFSIGNALED(status))
+      {
+        exit_code= EXIT_FAILURE;
+      }
+      _exit(exit_code);
+    }
+    else
+    {
+      _exit(EXIT_SUCCESS);
+    }
+  }
+
+  /* child */
+  if (setsid() == -1)
+  {
+    perror("setsid");
+    return false;
+  }
+
+  if (is_chdir)
+  {
+    if (chdir("/") < 0)
+    {
+      perror("chdir");
+      return false;
+    }
+  }
+
+  return true; 
+}
+
+} /* namespace util */
+} /* namespace datadifferential */