From 61675c20d81a318e214a0e1a2cfc90c6c11527eb Mon Sep 17 00:00:00 2001
From: orignal <i2porignal@yandex.ru>
Date: Mon, 29 Feb 2016 11:02:55 -0500
Subject: [PATCH] don't delete log file upon HUP

---
 Log.cpp | 8 +++++---
 Log.h   | 2 +-
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/Log.cpp b/Log.cpp
index 6391bcae..6bba1b62 100644
--- a/Log.cpp
+++ b/Log.cpp
@@ -44,10 +44,12 @@ void Log::Flush ()
 		m_LogStream->flush();
 }
 
-void Log::SetLogFile (const std::string& fullFilePath)
+void Log::SetLogFile (const std::string& fullFilePath, bool truncate)
 {
 	m_FullFilePath = fullFilePath;	
-	auto logFile = std::make_shared<std::ofstream> (fullFilePath, std::ofstream::out | std::ofstream::binary | std::ofstream::trunc);
+	auto mode = std::ofstream::out | std::ofstream::binary;
+	mode |= truncate ? std::ofstream::trunc : std::ofstream::app;
+	auto logFile = std::make_shared<std::ofstream> (fullFilePath, mode);
 	if (logFile->is_open ())
 	{
 		SetLogStream (logFile);
@@ -59,7 +61,7 @@ void Log::ReopenLogFile ()
 {
 	if (m_FullFilePath.length () > 0)
 	{
-		SetLogFile (m_FullFilePath);
+		SetLogFile (m_FullFilePath, false); // don't truncate
 		LogPrint(eLogInfo, "Log: file ", m_FullFilePath,  " reopen");
 	}
 }
diff --git a/Log.h b/Log.h
index 05bae7d9..5b07e2c9 100644
--- a/Log.h
+++ b/Log.h
@@ -38,7 +38,7 @@ class Log: public i2p::util::MsgQueue<LogMsg>
 		Log () { SetOnEmpty (std::bind (&Log::Flush, this)); };
 		~Log () {};
 
-		void SetLogFile (const std::string& fullFilePath);
+		void SetLogFile (const std::string& fullFilePath, bool truncate = true);
 		void ReopenLogFile ();
 		void SetLogLevel (const std::string& level);
 		void SetLogStream (std::shared_ptr<std::ostream> logStream);