Add fsctl shutdown_check to see if we're currently shutting down

src/include/switch_types.h

@@ -1539,7 +1539,8 @@ typedef enum {
 	SCSC_SAVE_HISTORY,
 	SCSC_CRASH,
 	SCSC_MIN_IDLE_CPU,
-	SCSC_VERBOSE_EVENTS
+	SCSC_VERBOSE_EVENTS,
+	SCSC_SHUTDOWN_CHECK
 } switch_session_ctl_t;
 
 typedef enum {

src/mod/applications/mod_commands/mod_commands.c

@@ -1563,6 +1563,9 @@ SWITCH_STANDARD_API(ctl_function)
 		} else if (!strcasecmp(argv[0], "save_history")) {
 			switch_core_session_ctl(SCSC_SAVE_HISTORY, NULL);
 			stream->write_function(stream, "+OK\n");
+		} else if (!strcasecmp(argv[0], "shutdown_check")) {
+			switch_core_session_ctl(SCSC_SHUTDOWN_CHECK, &arg);
+			stream->write_function(stream, arg ? "true" : "false");
 		} else if (!strcasecmp(argv[0], "shutdown")) {
 			switch_session_ctl_t command = SCSC_SHUTDOWN;
 			int x = 0;

src/switch_core.c

@@ -1772,6 +1772,9 @@ SWITCH_DECLARE(int32_t) switch_core_session_ctl(switch_session_ctl_t cmd, void *
 			}
 		}
 		break;
+	case SCSC_SHUTDOWN_CHECK:
+		newintval = !!switch_test_flag((&runtime), SCF_SHUTDOWN_REQUESTED);
+		break;
 	case SCSC_SHUTDOWN:
 
 #ifdef _MSC_VER