Reopen debug.log on SIGHUP

The best log rotation method formerly available was to configure
logrotate with the copytruncate option.  As described in the logrotate
documentation, "there is a very small time slice between copying the
file and truncating it, so some logging data might be lost".

By sending SIGHUP to the server process, one can now reopen the debug
log file without losing any data.

3 files changed, 21 insertions, 1 deletions

diff --git a/src/init.cpp b/src/init.cpp
index b027a53d81..726950bdb6 100644
--- a/src/init.cpp
+++ b/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");
diff --git a/src/util.cpp b/src/util.cpp
index d143306aec..e3a49dcbcf 100644
--- a/src/util.cpp
+++ b/src/util.cpp
@@ -70,6 +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;
@@ -213,6 +214,14 @@ inline int OutputDebugStringF(const char* pszFormat, ...)
             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)
                 fprintf(fileout, "%s ", DateTimeStrFormat("%x %H:%M:%S", GetTime()).c_str());
diff --git a/src/util.h b/src/util.h
index f7bdaf5332..edef354443 100644
--- a/src/util.h
+++ b/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();