[windows] re-call signal in sigint_handler for Windows

Summary:
Windows requires re-setting the signal handler each time it is used
and thus ctrl-c was not behaving properly on Windows

Reviewers: jfb

Differential Revision: https://reviews.llvm.org/D64046

llvm-svn: 365868

lldb/tools/driver/Driver.cpp

@@ -706,6 +706,9 @@ void sigwinch_handler(int signo) {
 }
 
 void sigint_handler(int signo) {
+#ifdef _WIN32 // Restore handler as it is not persistent on Windows
+  signal(SIGINT, sigint_handler);
+#endif
   static std::atomic_flag g_interrupt_sent = ATOMIC_FLAG_INIT;
   if (g_driver != nullptr) {
     if (!g_interrupt_sent.test_and_set()) {