[core] Add SHUTDOWN_REQUESTED event. Bind to this event to know when ASAP or elegant shutdown has been requested.

src/include/switch_types.h

@@ -2048,6 +2048,7 @@ typedef uint32_t switch_io_flag_t;
     SWITCH_EVENT_CALL_SETUP_RESULT
     SWITCH_EVENT_CALL_DETAIL
     SWITCH_EVENT_DEVICE_STATE
+    SWITCH_EVENT_SHUTDOWN_REQUESTED		- Shutdown of the system has been requested
     SWITCH_EVENT_ALL				- All events at once
 </pre>
 
@@ -2143,6 +2144,7 @@ typedef enum {
 	SWITCH_EVENT_CALL_DETAIL,
 	SWITCH_EVENT_DEVICE_STATE,
 	SWITCH_EVENT_TEXT,
+	SWITCH_EVENT_SHUTDOWN_REQUESTED,
 	SWITCH_EVENT_ALL
 } switch_event_types_t;
 

src/switch_core.c

@@ -2809,7 +2809,11 @@ SWITCH_DECLARE(int32_t) switch_core_session_ctl(switch_session_ctl_t cmd, void *
 		{
 			int x = 19;
 			uint32_t count;
-
+			switch_event_t *shutdown_requested_event = NULL;
+			if (switch_event_create(&shutdown_requested_event, SWITCH_EVENT_SHUTDOWN_REQUESTED) == SWITCH_STATUS_SUCCESS) {
+				switch_event_add_header(shutdown_requested_event, SWITCH_STACK_BOTTOM, "Event-Info", "%s", cmd == SCSC_SHUTDOWN_ASAP ? "ASAP" : "elegant");
+				switch_event_fire(&shutdown_requested_event);
+			}
 			switch_set_flag((&runtime), SCF_SHUTDOWN_REQUESTED);
 			if (cmd == SCSC_SHUTDOWN_ASAP) {
 				switch_set_flag((&runtime), SCF_NO_NEW_SESSIONS);

src/switch_event.c

@@ -223,6 +223,7 @@ static char *EVENT_NAMES[] = {
 	"CALL_DETAIL",
 	"DEVICE_STATE",
 	"TEXT",
+	"SHUTDOWN_REQUESTED",
 	"ALL"
 };