Fix puglSendEvent() error handling on X11

2 files changed, 13 insertions, 2 deletions

diff --git a/pugl/detail/x11.c b/pugl/detail/x11.c
index 6958785..fd76606 100644
--- a/pugl/detail/x11.c
+++ b/pugl/detail/x11.c
@@ -859,6 +859,8 @@ puglSendEvent(PuglView* view, const PuglEvent* event)
 	if (xev.type) {
 		if (XSendEvent(view->impl->display, view->impl->win, False, 0, &xev)) {
 			return PUGL_SUCCESS;
+		} else {
+			return PUGL_UNKNOWN_ERROR;
 		}
 	}
 
diff --git a/pugl/pugl.h b/pugl/pugl.h
index a665721..9c7ad26 100644
--- a/pugl/pugl.h
+++ b/pugl/pugl.h
@@ -1275,8 +1275,17 @@ puglStopTimer(PuglView* view, uintptr_t id);
 
    If supported, the event will be delivered to the view via the event loop
    like other events.  Note that this function only works for certain event
-   types, and will return PUGL_UNSUPPORTED_TYPE for events that are not
-   supported.
+   types.
+
+   Currently, only #PUGL_CLIENT events are supported on all platforms.
+
+   X11: A #PUGL_EXPOSE event can be sent, which is similar to calling
+   puglPostRedisplayRect(), but will always send a message to the X server,
+   even when called in an event handler.
+
+   @return
+   - #PUGL_UNSUPPORTED_TYPE if sending events of this type is not supported.
+   - #PUGL_UNKNOWN_ERROR if sending the event failed.
 */
 PUGL_API PuglStatus
 puglSendEvent(PuglView* view, const PuglEvent* event);