Added FTDM_SPAN_NON_STOPPABLE flag for signalling modules that do not support individual start/stop

libs/freetdm/src/ftdm_io.c

@@ -634,6 +634,10 @@ static ftdm_status_t ftdm_span_destroy(ftdm_span_t *span)
 	ftdm_mutex_lock(span->mutex);
 
 	/* stop the signaling */
+
+	/* This is a forced stopped */
+	ftdm_clear_flag(span, FTDM_SPAN_NON_STOPPABLE);
+	
 	ftdm_span_stop(span);
 
 	/* destroy the channels */
@@ -739,6 +743,11 @@ FT_DECLARE(ftdm_status_t) ftdm_span_stop(ftdm_span_t *span)
 	ftdm_status_t status =  FTDM_SUCCESS;
 	
 	ftdm_mutex_lock(span->mutex);
+	
+	if (ftdm_test_flag(span, FTDM_SPAN_NON_STOPPABLE)) {
+		status = FTDM_NOTIMPL;
+		goto done;
+	}
 
 	if (!ftdm_test_flag(span, FTDM_SPAN_STARTED)) {
 		status = FTDM_EINVAL;

libs/freetdm/src/ftmod/ftmod_sangoma_isdn/ftmod_sangoma_isdn.c

@@ -1094,6 +1094,7 @@ static FIO_CONFIGURE_SPAN_SIGNALING_FUNCTION(ftdm_sangoma_isdn_span_config)
 	ftdm_set_flag(span, FTDM_SPAN_USE_SIGNALS_QUEUE);
 	ftdm_set_flag(span, FTDM_SPAN_USE_PROCEED_STATE);
 	ftdm_set_flag(span, FTDM_SPAN_USE_SKIP_STATES);
+	ftdm_set_flag(span, FTDM_SPAN_NON_STOPPABLE);
 
 	if (span->trunk_type == FTDM_TRUNK_BRI_PTMP ||
 		span->trunk_type == FTDM_TRUNK_BRI) {

libs/freetdm/src/include/private/ftdm_types.h

@@ -186,6 +186,9 @@ typedef enum {
 	/* If this flag is set, the signalling module supports jumping directly to state up, without
 		going through PROGRESS/PROGRESS_MEDIA */
 	FTDM_SPAN_USE_SKIP_STATES = (1 << 12),
+	/* If this flag is set, then this span cannot be stopped individually, it can only be stopped
+		on freetdm unload */
+	FTDM_SPAN_NON_STOPPABLE = (1 << 13),
 } ftdm_span_flag_t;
 
 /*! \brief Channel supported features */