Proper fix for core status setting upon shutdown

Use a lighter version of sr_set_core_status() in order to avoid any shm / locking / event related operations when setting the shutdown core status.
(see original report and workaround e7b8084)

(cherry picked from commit 49d3888)

shutdown.c

@@ -190,7 +190,7 @@ void shutdown_opensips( int status )
 	int i, n, p;
 	int chld_status;
 
-	sr_set_core_status( STATE_TERMINATING, MI_SSTR("shutting down"));
+	sr_set_core_status_terminating();
 
 	/* terminate all processes */
 

status_report.c

@@ -702,6 +702,19 @@ int sr_set_core_status(int status, char *txt_s, int txt_len)
 }
 
 
+/* light version of set_core_status, doing no shm, locking or event
+ * operations - such ops are potentially dangerous during shutdonw */
+void sr_set_core_status_terminating( void )
+{
+	sri_core->status = STATE_TERMINATING;
+	/* note: the below assigment will produce a small mem leak in shm
+	 * (for the previously allocated status), but we do not really care
+	 * as we do this only once, at shutdown */
+	sri_core->status_txt.s = "shutting down";
+	sri_core->status_txt.len = 13;
+}
+
+
 int sr_get_core_status(void)
 {
 	return sri_core->status;

status_report.h

@@ -82,6 +82,8 @@ enum sr_core_states { STATE_NONE=-100, STATE_TERMINATING=-2,
 
 int sr_set_core_status(int status, char *txt_s, int txt_len);
 
+void sr_set_core_status_terminating( void );
+
 int sr_get_core_status(void);
 
 int sr_add_core_report(char *report_s, int report_len);