added SIGINT and SIGTERM handling to unix client and server.

either signal causes the main thread to be cancelled.  added
necessary code to make main thread cancellation clean up
nicely.

client/client.cpp

@@ -5,6 +5,7 @@
 #include "CNetwork.h"
 #include "CNetworkAddress.h"
 #include "CThread.h"
+#include "XThread.h"
 #include <assert.h>
 
 //
@@ -42,20 +43,24 @@ void					realMain(const CString& name,
 	s_logMutex = &logMutex;
 	CLog::setLock(&logLock);
 
-	// initialize network library
-	CNetwork::init();
-
 	CClient* client = NULL;
 	try {
+		// initialize network library
+		CNetwork::init();
+
+		// run client
 		CNetworkAddress addr(hostname, port);
 		client = new CClient(name);
 		client->run(addr);
+
+		// clean up
 		delete client;
 		CNetwork::cleanup();
 		CLog::setLock(NULL);
 		s_logMutex = NULL;
 	}
 	catch (...) {
+		// clean up
 		delete client;
 		CNetwork::cleanup();
 		CLog::setLock(NULL);
@@ -93,6 +98,10 @@ int WINAPI WinMain(HINSTANCE instance, HINSTANCE, LPSTR, int)
 		MessageBox(NULL, msg.c_str(), "error", MB_OK | MB_ICONERROR);
 		return 1;
 	}
+	catch (XThread&) {
+		// terminated
+		return 1;
+	}
 }
 
 #else
@@ -114,6 +123,10 @@ int main(int argc, char** argv)
 		fprintf(stderr, "failed: %s\n", e.what());
 		return 1;
 	}
+	catch (XThread&) {
+		// terminated
+		return 1;
+	}
 }
 
 #endif