Introduce new S_GLOBAL_SHUTDOWN signal

This is used to notify various parts of OpenBSC that we're shutting
down.

openbsc/include/openbsc/signal.h

@@ -40,6 +40,7 @@ enum signal_subsystems {
 	SS_LCHAN,
 	SS_SUBSCR,
 	SS_SCALL,
+	SS_GLOBAL,
 };
 
 /* SS_PAGING signals */
@@ -99,6 +100,10 @@ enum signal_scall {
 	S_SCALL_DETACHED,
 };
 
+enum signal_global {
+	S_GLOBAL_SHUTDOWN,
+};
+
 typedef int signal_cbfn(unsigned int subsys, unsigned int signal,
 			void *handler_data, void *signal_data);
 

openbsc/src/bsc_hack.c

@@ -35,6 +35,7 @@
 #include <openbsc/debug.h>
 #include <openbsc/e1_input.h>
 #include <openbsc/talloc.h>
+#include <openbsc/signal.h>
 
 /* MCC and MNC for the Location Area Identifier */
 struct gsm_network *bsc_gsmnet = 0;
@@ -143,6 +144,7 @@ static void signal_handler(int signal)
 	switch (signal) {
 	case SIGINT:
 		bsc_shutdown_net(bsc_gsmnet);
+		dispatch_signal(SS_GLOBAL, S_GLOBAL_SHUTDOWN, NULL);
 		sleep(3);
 		exit(0);
 		break;