add SIGTERM handle for brpc controller

src/brpc/controller.cpp

@@ -1374,27 +1374,46 @@ typedef sighandler_t SignalHandler;
 #endif
 
 static volatile bool s_signal_quit = false;
-static SignalHandler s_prev_handler = NULL;
+static SignalHandler s_prev_sigint_handler = NULL;
+static SignalHandler s_prev_sigterm_handler = NULL;
+
 static void quit_handler(int signo) {
     s_signal_quit = true;
-    if (s_prev_handler) {
-        s_prev_handler(signo);
+    if (SIGINT == signo && s_prev_sigint_handler) {
+        s_prev_sigint_handler(signo);
+    }
+    if (SIGTERM == signo && s_prev_sigterm_handler) {
+        s_prev_sigterm_handler(signo);
     }
 }
+
 static pthread_once_t register_quit_signal_once = PTHREAD_ONCE_INIT;
+
 static void RegisterQuitSignalOrDie() {
     // Not thread-safe.
-    const SignalHandler prev = signal(SIGINT, quit_handler);
+    SignalHandler prev = signal(SIGINT, quit_handler);
     if (prev != SIG_DFL &&
         prev != SIG_IGN) { // shell may install SIGINT of background jobs with SIG_IGN
         if (prev == SIG_ERR) {
             LOG(ERROR) << "Fail to register SIGINT, abort";
             abort();
         } else {
-            s_prev_handler = prev;
+            s_prev_sigint_handler = prev;
             LOG(WARNING) << "SIGINT was installed with " << prev;
         }
     }
+
+    prev = signal(SIGTERM, quit_handler);
+    if (prev != SIG_DFL &&
+        prev != SIG_IGN) { // shell may install SIGTERM of background jobs with SIG_IGN
+        if (prev == SIG_ERR) {
+            LOG(ERROR) << "Fail to register SIGTERM, abort";
+            abort();
+        } else {
+            s_prev_sigterm_handler = prev;
+            LOG(WARNING) << "SIGTERM was installed with " << prev;
+        }
+    }
 }
 
 bool IsAskedToQuit() {