mixer_plugin: get_volume() may return -1 if unavailable

If the method get_volume() returns -1 and no error object is set, then the volume is currently unavailable, but the mixer should not be closed immediately.

mixer_plugin: get_volume() may return -1 if unavailable
c4f895da · Max Kellermann · ede828c9 · c4f895da · c4f895da
Commit c4f895da authored Oct 23, 2009 by Max Kellermann
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Showing with 8 additions and 4 deletions

mixer_control.c src/mixer_control.c +6 -2

mixer_plugin.h src/mixer_plugin.h +2 -2

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--- a/src/mixer_control.c
+++ b/src/mixer_control.c
@@ -140,9 +140,13 @@ mixer_get_volume(struct mixer *mixer, GError **error_r)
 	g_mutex_lock(mixer->mutex);
 	if (mixer->open) {
-		volume = mixer->plugin->get_volume(mixer, error_r);
+		GError *error = NULL;
-		if (volume < 0)
+		volume = mixer->plugin->get_volume(mixer, &error);
+		if (volume < 0 && error != NULL) {
+			g_propagate_error(error_r, error);
 			mixer_failed(mixer);
+		}
 	} else
 		volume = -1;

--- a/src/mixer_plugin.h
+++ b/src/mixer_plugin.h
@@ -72,8 +72,8 @@ struct mixer_plugin {
 	 *
 	 * @param error_r location to store the error occuring, or
 	 * NULL to ignore errors
-	 * @return the current volume (0..100 including) or -1 on
+	 * @return the current volume (0..100 including) or -1 if
-	 * error
+	 * unavailable or on error (error_r set, mixer will be closed)
 	 */
 	int (*get_volume)(struct mixer *mixer, GError **error_r);