[11500] Allow run mangos as daemon (linux/other posix)

Signed-off-by: VladimirMangos <vladimir@getmangos.com>

src/shared/PosixDaemon.cpp

@@ -0,0 +1,136 @@
+/*
+ * Copyright (C) 2005-2011 MaNGOS <http://getmangos.com/>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+
+#include "Config/Config.h"
+#include "PosixDaemon.h"
+#include <cstdio>
+#include <iostream>
+#include <fstream>
+
+pid_t parent_pid = 0, sid = 0;
+
+void daemonSignal(int s)
+{
+
+    if (getpid() != parent_pid)
+    {
+        return;
+    }
+
+    if (s == SIGUSR1)
+    {
+        exit(EXIT_SUCCESS);
+    }
+
+    if (sid) {
+        kill(sid, s);
+    }
+
+    exit(EXIT_FAILURE);
+}
+
+
+void startDaemon(uint32_t timeout)
+{
+    parent_pid = getpid();
+    pid_t pid;
+
+    signal(SIGUSR1, daemonSignal);
+    signal(SIGINT, daemonSignal);
+    signal(SIGTERM, daemonSignal);
+    signal(SIGALRM, daemonSignal);
+
+    sid = pid = fork();
+
+    if (pid < 0) {
+      exit(EXIT_FAILURE);
+    }
+
+    if (pid > 0) {
+        alarm(timeout);
+        pause();
+        exit(EXIT_FAILURE);
+    }
+
+    umask(0);
+
+    sid = setsid();
+
+    if (sid < 0) {
+      exit(EXIT_FAILURE);
+    }
+
+    if ((chdir("/")) < 0) {
+      exit(EXIT_FAILURE);
+    }
+
+    freopen("/dev/null", "rt", stdin);
+    freopen("/dev/null", "wt", stdout);
+    freopen("/dev/null", "wt", stderr);
+}
+
+void stopDaemon()
+{
+    std::string pidfile = sConfig.GetStringDefault("PidFile", "");
+    if(!pidfile.empty())
+    {
+        std::fstream pf(pidfile.c_str(), std::ios::in);
+        uint32_t pid = 0;
+        pf >> pid;
+        if (kill(pid, SIGINT) < 0)
+        {
+            std::cerr << "Unable to stop daemon" << std::endl;
+            exit(EXIT_FAILURE);
+        }
+        pf.close();
+    }
+    else
+    {
+        std::cerr << "No pid file specified" << std::endl;
+    }
+
+    exit(EXIT_SUCCESS);
+}
+
+void detachDaemon()
+{
+    if (parent_pid)
+    {
+        kill(parent_pid, SIGUSR1);
+    }
+}
+
+
+void exitDaemon()
+{
+    if (parent_pid && parent_pid != getpid())
+    {
+        kill(parent_pid, SIGTERM);
+    }
+}
+
+
+struct WatchDog
+{
+    ~WatchDog()
+    {
+        exitDaemon();
+    }
+};
+
+WatchDog dog;