Add daemonize utils

daemon/daemonize.cpp

@@ -0,0 +1,49 @@
+#include "daemonize.h"
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <unistd.h>
+#include <syslog.h>
+#include <string.h>
+#include <iostream>
+
+namespace cpputils {
+
+    //TODO Test daemonize()
+
+    void daemonize() {
+            pid_t pid = fork();
+            if (pid < 0) {
+                exit(EXIT_FAILURE);
+            }
+            if (pid > 0) {
+                //We're the parent process. Exit.
+                exit(EXIT_SUCCESS);
+            }
+
+            // We're the child process.
+            umask(0);
+
+            // Create a new SID for the child process
+            pid_t sid = setsid();
+            if (sid < 0) {
+                std::cerr << "Failed to get SID for daemon process" << std::endl;
+                exit(EXIT_FAILURE);
+            }
+
+            // Change the current working directory to a directory that's always existin
+            if ((chdir("/")) < 0) {
+                std::cerr << "Failed to change working directory for daemon process" << std::endl;
+                exit(EXIT_FAILURE);
+            }
+
+            // Close out the standard file descriptors. The daemon can't use them anyhow.
+            close(STDIN_FILENO);
+            close(STDOUT_FILENO);
+            close(STDERR_FILENO);
+    };
+}

daemon/daemonize.h

@@ -0,0 +1,8 @@
+#ifndef CPPUTILS_DAEMON_DAEMONIZE_H
+#define CPPUTILS_DAEMON_DAEMONIZE_H
+
+namespace cpputils {
+    void daemonize();
+}
+
+#endif