Merge pull request #2 from older/masterHEADmaster

Add command line option to daemonize iiid process

1 files changed, 42 insertions, 2 deletions

diff --git a/src/iiid.cc b/src/iiid.cc
index b3dd3bf..29acd06 100644
--- a/src/iiid.cc
+++ b/src/iiid.cc
@@ -1,99 +1,139 @@
 #include <syslog.h>
 #include <getopt.h>
 #include <sys/stat.h>
 #include <glob.h>
 #include <iostream>
 #include <cassert>
 #include <stdexcept>
 #include "eyetil.h"
 #include "eyefiworker.h"
 
 #include "config.h"
 
 #include "eyefi.nsmap"
 
 #define PHEADER \
 	PACKAGE " Version " VERSION "\n" \
 	"Copyright (c) 2009 Klever Group"
 
 int main(int argc,char **argv) try {
 
     int port = 59278;
+    bool daemon_mode = false;
 
     while(true) {
 	static struct option opts[] = {
 	    { "help", no_argument, 0, 'h' },
 	    { "usage", no_argument, 0, 'h' },
 	    { "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':
 		std::cerr << PHEADER << std::endl << std::endl
 		    << " " << argv[0] << " [options]" << std::endl
 		    << std::endl <<
 		    " -h, --help,\n"
 		    " --usage                    display this text\n"
 		    " -V, --version              display version information\n"
 		    " -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;
 	    case 'V':
 		std::cerr << VERSION << std::endl;
 		exit(0);
 		break;
 	    case 'L':
 		extern const char *COPYING;
 		std::cerr << COPYING << std::endl;
 		exit(0);
 		break;
 	    case 'p':
 		port = 0xffff&strtol(optarg,0,0);
 		if(errno) {
 		    std::cerr << "Failed to parse port number" << std::endl;
 		    exit(1);
 		}
 		break;
+	    case 'd':
+		daemon_mode = true;
+		break;
 	    default:
 		std::cerr << "Huh?" << std::endl;
 		exit(1);
 		break;
 	}
     }
 
     const char *ident = rindex(*argv,'/');
     if(ident)
 	++ident;
     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))
 	syslog(LOG_WARNING,"configuration directory '%s' does not exist or is not a directory",EYEKIN_CONF_DIR);
     glob_t g; int rg = glob(EYEKIN_CONF_DIR"/????????????.conf",GLOB_NOSORT,NULL,&g);
     if(rg || !g.gl_pathc)
 	syslog(LOG_WARNING,"I see nothing resembling a card config in '%s'",EYEKIN_CONF_DIR);
     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();
     return 0;
 } catch(const throwable_exit& e) {
     return e.rc;
 } catch(const std::exception& e) {
     syslog(LOG_CRIT,"Exiting iii daemon, because of error condition");
     syslog(LOG_CRIT,"Exception: %s",e.what());
     return 1;
 }