From 9b1587f837f8b80f9aab41dc9ba4becce9d08268 Mon Sep 17 00:00:00 2001
From: Tobias Klauser <tklauser@distanz.ch>
Date: Thu, 5 Oct 2023 16:07:22 +0200
Subject: [PATCH] agent: check listener instead of portfile in Listen

After #213 the portfile might no longer be written, thus check the
listener to determine whether the agent is already listening.
---
 agent/agent.go | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/agent/agent.go b/agent/agent.go
index c35702d5..39bcbd51 100644
--- a/agent/agent.go
+++ b/agent/agent.go
@@ -79,7 +79,7 @@ func Listen(opts Options) (err error) {
 	mu.Lock()
 	defer mu.Unlock()
 
-	if portfile != "" {
+	if listener != nil {
 		return fmt.Errorf("gops: agent already listening at: %v", listener.Addr())
 	}
 
@@ -192,6 +192,7 @@ func Close() {
 	}
 	if listener != nil {
 		listener.Close()
+		listener = nil
 	}
 }