From 0f6efc26f6331bacf76c76ef1376d3cc6e450418 Mon Sep 17 00:00:00 2001
From: Michael Krelin <hacker@klever.net>
Date: Fri, 14 Feb 2014 21:25:33 +0000
Subject: Merge pull request #2 from older/master

Add command line option to daemonize iiid process
---
diff --git a/src/iiid.cc b/src/iiid.cc
index b3dd3bf..29acd06 100644
--- a/src/iiid.cc
+++ b/src/iiid.cc
@@ -19,6 +19,7 @@
 int main(int argc,char **argv) try {
 
     int port = 59278;
+    bool daemon_mode = false;
 
     while(true) {
 	static struct option opts[] = {
@@ -27,9 +28,10 @@ int main(int argc,char **argv) try {
 	    { "version", no_argument, 0, 'V' },
 	    { "license", no_argument, 0, 'L' },
 	    { "port", required_argument, 0, 'p' },
+	    { "daemon", no_argument, 0, 'd' },
 	    { NULL, 0, 0, 0 }
 	};
-	int c = getopt_long(argc,argv,"hVLp:",opts,NULL);
+	int c = getopt_long(argc,argv,"hVLp:d",opts,NULL);
 	if(c==-1) break;
 	switch(c) {
 	    case 'h':
@@ -42,6 +44,7 @@ int main(int argc,char **argv) try {
 		    " -L, --license              show license\n"
 		    " -p <port>, --port=<port>   port to listen to\n"
 		    "           (you're not likely to ever need it)\n"
+		    " -d, --daemon               run as daemon\n"
 		    << std::endl << std::endl;
 		exit(0);
 		break;
@@ -61,6 +64,9 @@ int main(int argc,char **argv) try {
 		    exit(1);
 		}
 		break;
+	    case 'd':
+		daemon_mode = true;
+		break;
 	    default:
 		std::cerr << "Huh?" << std::endl;
 		exit(1);
@@ -74,7 +80,7 @@ int main(int argc,char **argv) try {
     else
 	ident = *argv;
     openlog(ident,LOG_PERROR|LOG_PID,LOG_DAEMON);
-    syslog(LOG_INFO,"Starting iii eye-fi manager");
+    syslog(LOG_INFO,"Starting iii eye-fi manager on port %d", port);
 
     struct stat st;
     if(stat(EYEKIN_CONF_DIR,&st) || !S_ISDIR(st.st_mode))
@@ -85,6 +91,40 @@ int main(int argc,char **argv) try {
     else
 	globfree(&g);
 
+    if(daemon_mode) {
+	pid_t pid, sid;
+        
+	/* Fork off the parent process */
+	pid = fork();
+	if (pid < 0) {
+	    syslog(LOG_ERR, "Error forking the parent process");
+	    exit(EXIT_FAILURE);
+	}
+
+	/* If we got a good PID, then we can exit the parent process. */
+	if (pid > 0) {
+	    exit(EXIT_SUCCESS);
+	}
+
+	/* Create a new SID for the child process */
+	sid = setsid();
+	if (sid < 0) {
+	    syslog(LOG_ERR, "Error creating a new SID for the child process");
+	    exit(EXIT_FAILURE);
+	}
+        
+	/* Change the current working directory */
+	if ((chdir("/")) < 0) {
+	    syslog(LOG_ERR, "Error changing current working directory to /");
+	    exit(EXIT_FAILURE);
+	}
+        
+	/* Close out the standard file descriptors */
+	close(STDIN_FILENO);
+	close(STDOUT_FILENO);
+	close(STDERR_FILENO);		
+    }
+
     eyefiworker().run(port);
 
     closelog();
--
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