more error info

cheng-zhongliang · Aug 12, 2023 · dbaf213 · dbaf213
1 parent d18ba0f
commit dbaf213
Showing 1 changed file with 4 additions and 3 deletions.
diff --git a/epoll.go b/epoll.go
@@ -69,14 +69,15 @@ func (ep *epoll) add(ev *Event) error {
 	es, ok := ep.fdEvs[ev.fd]
 	if ok {
 		op = syscall.EPOLL_CTL_MOD
-		if es.events&ev.events != 0 {
-			return ErrEventExists
-		}
 	} else {
 		es = &fdEvent{}
 		ep.fdEvs[ev.fd] = es
 	}
 
+	if es.events&ev.events != 0 {
+		return ErrEventExists
+	}
+
 	es.events |= ev.events
 
 	if ev.events&EvRead != 0 {