From fe30ed2dcf2392f50b9305863d73fe2909567b8d Mon Sep 17 00:00:00 2001
From: Brad Fitzpatrick <bradfitz@golang.org>
Date: Tue, 24 Jan 2012 14:06:12 -0800
Subject: [PATCH] net: actually reset deadline when time is zero

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/5570056
---
 src/pkg/net/sockopt.go      | 12 ++++++++++--
 src/pkg/net/timeout_test.go | 27 +++++++++++++++++++++++++++
 2 files changed, 37 insertions(+), 2 deletions(-)

diff --git a/src/pkg/net/sockopt.go b/src/pkg/net/sockopt.go
index 59f9af5f30..3d0f8dd7a8 100644
--- a/src/pkg/net/sockopt.go
+++ b/src/pkg/net/sockopt.go
@@ -117,12 +117,20 @@ func setWriteBuffer(fd *netFD, bytes int) error {
 }
 
 func setReadDeadline(fd *netFD, t time.Time) error {
-	fd.rdeadline = t.UnixNano()
+	if t.IsZero() {
+		fd.rdeadline = 0
+	} else {
+		fd.rdeadline = t.UnixNano()
+	}
 	return nil
 }
 
 func setWriteDeadline(fd *netFD, t time.Time) error {
-	fd.wdeadline = t.UnixNano()
+	if t.IsZero() {
+		fd.wdeadline = 0
+	} else {
+		fd.wdeadline = t.UnixNano()
+	}
 	return nil
 }
 
diff --git a/src/pkg/net/timeout_test.go b/src/pkg/net/timeout_test.go
index 11db012ff5..bae37c86b2 100644
--- a/src/pkg/net/timeout_test.go
+++ b/src/pkg/net/timeout_test.go
@@ -77,3 +77,30 @@ func TestTimeoutTCP(t *testing.T) {
 	testTimeout(t, "tcp", addr, false)
 	<-done
 }
+
+func TestDeadlineReset(t *testing.T) {
+	if runtime.GOOS == "plan9" {
+		return
+	}
+	ln, err := Listen("tcp", "127.0.0.1:0")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer ln.Close()
+	tl := ln.(*TCPListener)
+	tl.SetDeadline(time.Now().Add(1 * time.Minute))
+	tl.SetDeadline(time.Time{}) // reset it
+	errc := make(chan error, 1)
+	go func() {
+		_, err := ln.Accept()
+		errc <- err
+	}()
+	select {
+	case <-time.After(50 * time.Millisecond):
+		// Pass.
+	case err := <-errc:
+		// Accept should never return; we never
+		// connected to it.
+		t.Errorf("unexpected return from Accept; err=%v", err)
+	}
+}
-- 
2.50.0