Freetdm: exposed channel availability rate to user

libs/freetdm/src/ftdm_io.c

@@ -1702,6 +1702,18 @@ static ftdm_status_t __inline__ get_best_rated(ftdm_channel_t **fchan, ftdm_chan
 
 	return FTDM_SUCCESS;
 }
+
+FT_DECLARE(int) ftdm_channel_get_availability(ftdm_channel_t *ftdmchan)
+{
+	int availability = -1;
+	ftdm_channel_lock(ftdmchan);
+	if (ftdm_test_flag(ftdmchan->span, FTDM_SPAN_USE_AV_RATE)) {
+		availability = ftdmchan->availability_rate;
+	}
+	ftdm_channel_unlock(ftdmchan);
+	return availability;
+}
+
 FT_DECLARE(ftdm_status_t) ftdm_channel_open_by_group(uint32_t group_id, ftdm_direction_t direction, ftdm_caller_data_t *caller_data, ftdm_channel_t **ftdmchan)
 {
 	ftdm_status_t status = FTDM_FAIL;

libs/freetdm/src/include/freetdm.h

@@ -696,6 +696,14 @@ typedef enum {
 /*! \brief Override the default queue handler */
 FT_DECLARE(ftdm_status_t) ftdm_global_set_queue_handler(ftdm_queue_handler_t *handler);
 
+/*! \brief Return the availability rate for a channel 
+ * \param ftdmchan Channel to get the availability from
+ *
+ * \retval > 0 if availability is supported
+ * \retval -1 if availability is not supported
+ */
+FT_DECLARE(int) ftdm_channel_get_availability(ftdm_channel_t *ftdmchan);
+
 /*! \brief Answer call */
 #define ftdm_channel_call_answer(ftdmchan) _ftdm_channel_call_answer(__FILE__, __FUNCTION__, __LINE__, (ftdmchan))