The Quake III Arena sources as originally released under the GPL license on August 20, 2005.

lcc/src/event.c

@@ -0,0 +1,28 @@
+#include "c.h"
+
+
+struct entry {
+	Apply func;
+	void *cl;
+};
+
+Events events;
+void attach(Apply func, void *cl, List *list) {
+	struct entry *p;
+
+	NEW(p, PERM);
+	p->func = func;
+	p->cl = cl;
+	*list = append(p, *list);
+}
+void apply(List event, void *arg1, void *arg2) {
+	if (event) {
+		List lp = event;
+		do {
+			struct entry *p = lp->x;
+			(*p->func)(p->cl, arg1, arg2);
+			lp = lp->link;
+		} while (lp != event);
+	}
+}
+