#355. reopen log file by SIGHUP

DaemonLinux.cpp

@@ -17,9 +17,9 @@ void handle_signal(int sig)
 	switch (sig)
 	{
 	case SIGHUP:
-		LogPrint(eLogInfo, "Daemon: Got SIGHUP, doing nothing");
-		// TODO:
-		break;
+		LogPrint(eLogInfo, "Daemon: Got SIGHUP, reopening log...");
+		ReopenLogFile ();
+	break;
 	case SIGABRT:
 	case SIGTERM:
 	case SIGINT:

Log.cpp

@@ -46,6 +46,7 @@ void Log::Flush ()
 
 void Log::SetLogFile (const std::string& fullFilePath)
 {
+	m_FullFilePath = fullFilePath;	
 	auto logFile = std::make_shared<std::ofstream> (fullFilePath, std::ofstream::out | std::ofstream::binary | std::ofstream::trunc);
 	if (logFile->is_open ())
 	{
@@ -54,6 +55,16 @@ void Log::SetLogFile (const std::string& fullFilePath)
 	}	
 }
 
+void Log::ReopenLogFile ()
+{
+	if (m_FullFilePath.length () > 0)
+	{
+		SetLogFile (m_FullFilePath);
+		LogPrint(eLogInfo, "Log: file ", m_FullFilePath,  " reopen");
+	}
+}
+
+
 void Log::SetLogLevel (const std::string& level)
 {
   if      (level == "error") { m_MinLevel = eLogError; }

Log.h

@@ -39,6 +39,7 @@ class Log: public i2p::util::MsgQueue<LogMsg>
 		~Log () {};
 
 		void SetLogFile (const std::string& fullFilePath);
+		void ReopenLogFile ();
 		void SetLogLevel (const std::string& level);
 		void SetLogStream (std::shared_ptr<std::ostream> logStream);
 		std::shared_ptr<std::ostream> GetLogStream () const { return m_LogStream; };	
@@ -51,6 +52,7 @@ class Log: public i2p::util::MsgQueue<LogMsg>
 
 	private:
 		
+		std::string m_FullFilePath; // empty if stream
 		std::shared_ptr<std::ostream> m_LogStream;
 		enum LogLevel m_MinLevel;
 		std::string m_Timestamp;
@@ -102,6 +104,12 @@ inline void SetLogLevel (const std::string& level)
 		g_Log->SetLogLevel(level);
 }
 
+inline void ReopenLogFile ()
+{
+	if (g_Log)	
+		g_Log->ReopenLogFile ();
+}
+
 template<typename TValue>
 void LogPrint (std::stringstream& s, TValue arg) 
 {