implement ext-idle-notify-v1

src/call-idle-handler.c

@@ -0,0 +1,36 @@
+#include <libguile.h>
+
+#include "seat.h"
+#include "call-idle-handler.h"
+
+static void *call_idle_handler_inner (void *data)
+{
+	struct Call_idle_handler_parameters *params =
+		(struct Call_idle_handler_parameters *)data;
+
+	SCM event;
+	switch (params->event)
+	{
+		case IDLE:   event = scm_from_utf8_symbol("idle");   break;
+		case RESUME: event = scm_from_utf8_symbol("resume"); break;
+	}
+
+	return scm_call_1(params->idle->handler, event);
+}
+
+void *call_idle_handler (void *data)
+{
+	/* Continuation barrier causes stack unwind on exceptions (i.e. errors
+	 * in the user defined ide handler) to stop here. Otherwise the entire
+         * stack created by scm_with_guile() would be unwound. This makes
+         * responding to exceptions nicer.
+	 */
+	SCM call_result = scm_c_with_continuation_barrier(
+		call_idle_handler_inner, data
+	);
+
+	if ( call_result == NULL )
+		return (void *)"ERROR: An exception occured while calling the user-command handler.\n";
+
+	return NULL;
+}