fReopenDebugLog and fRequestShutdown should be type sig_atomic_t

This allows access as an atomic variable in the presence
of async interrupts.

See issue #7433 for more details
fixes: #7433

src/init.cpp

@@ -111,7 +111,7 @@ CClientUIInterface uiInterface; // Declared but not defined in ui_interface.h
 // shutdown thing.
 //
 
-volatile bool fRequestShutdown = false;
+volatile sig_atomic_t fRequestShutdown = false;
 
 void StartShutdown()
 {

src/util.cpp

@@ -107,9 +107,10 @@ bool fPrintToDebugLog = true;
 bool fDaemon = false;
 bool fServer = false;
 string strMiscWarning;
-bool fLogTimestamps = false;
+bool fLogTimestamps = DEFAULT_LOGTIMESTAMPS;
-bool fLogIPs = false;
+bool fLogTimeMicros = DEFAULT_LOGTIMEMICROS;
-volatile bool fReopenDebugLog = false;
+bool fLogIPs = DEFAULT_LOGIPS;
+volatile sig_atomic_t fReopenDebugLog = false;
 CTranslationInterface translationInterface;
 
 /** Init OpenSSL library multithreading support */

src/util.h

@@ -28,6 +28,14 @@
 #include <boost/signals2/signal.hpp>
 #include <boost/thread/exceptions.hpp>
 
+#ifndef WIN32
+#include <signal.h>
+#endif
+
+static const bool DEFAULT_LOGTIMEMICROS = false;
+static const bool DEFAULT_LOGIPS        = false;
+static const bool DEFAULT_LOGTIMESTAMPS = true;
+
 /** Signals for translation. */
 class CTranslationInterface
 {
@@ -45,7 +53,7 @@ extern bool fServer;
 extern std::string strMiscWarning;
 extern bool fLogTimestamps;
 extern bool fLogIPs;
-extern volatile bool fReopenDebugLog;
+extern volatile sig_atomic_t fReopenDebugLog;
 extern CTranslationInterface translationInterface;
 
 /**