use system folders if run as service

Daemon.cpp

@@ -39,6 +39,14 @@ namespace i2p
 			delete &d;
 		};
 
+		bool Daemon_Singleton::IsService () const
+		{
+#ifndef _WIN32
+			return i2p::util::config::GetArg("-service", 0);
+#else
+			return false;
+#endif
+		}
 
 		bool Daemon_Singleton::init(int argc, char* argv[])
 		{
@@ -76,11 +84,11 @@ namespace i2p
 			{
 				if (isDaemon)
 				{
-					std::string logfile_path = i2p::util::filesystem::GetDataDir().string();
+					std::string logfile_path = IsService () ? "/var/log" : i2p::util::filesystem::GetDataDir().string();
 	#ifndef _WIN32
-					logfile_path.append("/debug.log");
+					logfile_path.append("/i2pd.log");
 	#else
-					logfile_path.append("\\debug.log");
+					logfile_path.append("\\i2pd.log");
 	#endif
 					StartLog (logfile_path);
 				}

Daemon.h

@@ -28,6 +28,8 @@ namespace i2p
 			Daemon_Singleton();
 			virtual ~Daemon_Singleton();
 
+			bool IsService () const;				
+
 			// d-pointer for httpServer, httpProxy, etc.
 			class Daemon_Singleton_Private;
 			Daemon_Singleton_Private &d;

DaemonLinux.cpp

@@ -74,7 +74,7 @@ namespace i2p
 			}
 
 			// Pidfile
-			pidfile = i2p::util::filesystem::GetDataDir().string();
+			pidfile = IsService () ? "/var/run" : i2p::util::filesystem::GetDataDir().string();
 			pidfile.append("/i2pd.pid");
 			pidFilehandle = open(pidfile.c_str(), O_RDWR | O_CREAT, 0600);
 			if (pidFilehandle == -1)

README.md

@@ -49,6 +49,7 @@ Options
 * --httpport=           - The http port to listen on
 * --log=                - Enable or disable logging to file. 1 for yes, 0 for no.
 * --daemon=             - Enable or disable daemon mode. 1 for yes, 0 for no.
+* --service=            - 1 if uses system folders (/var/run/i2pd.pid, /var/log/i2pd.log, /var/lib/i2pd).
 * --unreachable=        - 1 if router is declared as unreachable and works through introducers.
 * --httpproxyport=      - The port to listen on (HTTP Proxy)
 * --socksproxyport=     - The port to listen on (SOCKS Proxy)

util.cpp

@@ -168,13 +168,15 @@ namespace filesystem
 		// Windows < Vista: C:\Documents and Settings\Username\Application Data\i2pd
 		// Windows >= Vista: C:\Users\Username\AppData\Roaming\i2pd
 		// Mac: ~/Library/Application Support/i2pd
-		// Unix: ~/.i2pd
+		// Unix: ~/.i2pd or /var/lib/i2pd is system=1
 #ifdef WIN32
 		// Windows
 		char localAppData[MAX_PATH];
 		SHGetFolderPath(NULL, CSIDL_APPDATA, 0, NULL, localAppData);
 		return boost::filesystem::path(std::string(localAppData) + "\\i2pd");
 #else
+		if (i2p::util::config::GetArg("-service", 0)) // use system folder
+			return boost::filesystem::path("/var/lib/i2pd");
 		boost::filesystem::path pathRet;
 		char* pszHome = getenv("HOME");
 		if (pszHome == NULL || strlen(pszHome) == 0)