Reopen log file on SIGHUP

src/init.cpp

@@ -80,6 +80,10 @@ void HandleSIGTERM(int)
     fRequestShutdown = true;
 }
 
+void HandleSIGHUP(int)
+{
+    fReopenDebugLog = true;
+}
 
 
 
@@ -285,7 +289,13 @@ bool AppInit2()
     sa.sa_flags = 0;
     sigaction(SIGTERM, &sa, NULL);
     sigaction(SIGINT, &sa, NULL);
-    sigaction(SIGHUP, &sa, NULL);
+
+    // Reopen debug.log on SIGHUP
+    struct sigaction sa_hup;
+    sa_hup.sa_handler = HandleSIGHUP;
+    sigemptyset(&sa_hup.sa_mask);
+    sa_hup.sa_flags = 0;
+    sigaction(SIGHUP, &sa_hup, NULL);
 #endif
 
     fTestNet = GetBoolArg("-testnet");

src/util.cpp

@@ -25,6 +25,7 @@ namespace boost {
 #include <boost/filesystem.hpp>
 #include <boost/filesystem/fstream.hpp>
 #include <boost/foreach.hpp>
+#include <boost/thread.hpp>
 #include <openssl/crypto.h>
 #include <openssl/rand.h>
 #include <stdarg.h>
@@ -69,6 +70,7 @@ bool fTestNet = false;
 bool fNoListen = false;
 bool fLogTimestamps = false;
 CMedianFilter<int64> vTimeOffsets(200,0);
+bool fReopenDebugLog = false;
 
 // Init openssl library multithreading support
 static CCriticalSection** ppmutexOpenSSL;
@@ -209,6 +211,16 @@ inline int OutputDebugStringF(const char* pszFormat, ...)
         if (fileout)
         {
             static bool fStartedNewLine = true;
+            static boost::mutex mutexDebugLog;
+            boost::mutex::scoped_lock scoped_lock(mutexDebugLog);
+
+            // reopen the log file, if requested
+            if (fReopenDebugLog) {
+                fReopenDebugLog = false;
+                boost::filesystem::path pathDebug = GetDataDir() / "debug.log";
+                if (freopen(pathDebug.string().c_str(),"a",fileout) != NULL)
+                    setbuf(fileout, NULL); // unbuffered
+            }
 
             // Debug print useful for profiling
             if (fLogTimestamps && fStartedNewLine)

src/util.h

@@ -121,6 +121,7 @@ extern std::string strMiscWarning;
 extern bool fTestNet;
 extern bool fNoListen;
 extern bool fLogTimestamps;
+extern bool fReopenDebugLog;
 
 void RandAddSeed();
 void RandAddSeedPerfmon();