89 lines
2.2 KiB
Go
89 lines
2.2 KiB
Go
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// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package net
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import (
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"runtime"
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"testing"
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"time"
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)
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func newLocalListener(t *testing.T) Listener {
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ln, err := Listen("tcp", "127.0.0.1:0")
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if err != nil {
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ln, err = Listen("tcp6", "[::1]:0")
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}
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if err != nil {
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t.Fatal(err)
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}
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return ln
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}
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func TestDialTimeout(t *testing.T) {
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ln := newLocalListener(t)
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defer ln.Close()
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errc := make(chan error)
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const SOMAXCONN = 0x80 // copied from syscall, but not always available
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const numConns = SOMAXCONN + 10
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// TODO(bradfitz): It's hard to test this in a portable
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// way. This is unforunate, but works for now.
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switch runtime.GOOS {
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case "linux":
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// The kernel will start accepting TCP connections before userspace
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// gets a chance to not accept them, so fire off a bunch to fill up
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// the kernel's backlog. Then we test we get a failure after that.
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for i := 0; i < numConns; i++ {
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go func() {
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_, err := DialTimeout("tcp", ln.Addr().String(), 200*time.Millisecond)
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errc <- err
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}()
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}
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case "darwin":
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// At least OS X 10.7 seems to accept any number of
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// connections, ignoring listen's backlog, so resort
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// to connecting to a hopefully-dead 127/8 address.
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go func() {
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_, err := DialTimeout("tcp", "127.0.71.111:80", 200*time.Millisecond)
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errc <- err
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}()
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default:
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// TODO(bradfitz): this probably doesn't work on
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// Windows? SOMAXCONN is huge there. I'm not sure how
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// listen works there.
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// OpenBSD may have a reject route to 10/8.
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// FreeBSD likely works, but is untested.
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t.Logf("skipping test on %q; untested.", runtime.GOOS)
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return
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}
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connected := 0
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for {
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select {
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case <-time.After(15 * time.Second):
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t.Fatal("too slow")
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case err := <-errc:
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if err == nil {
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connected++
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if connected == numConns {
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t.Fatal("all connections connected; expected some to time out")
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}
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} else {
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terr, ok := err.(timeout)
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if !ok {
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t.Fatalf("got error %q; want error with timeout interface", err)
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}
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if !terr.Timeout() {
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t.Fatalf("got error %q; not a timeout", err)
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}
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// Pass. We saw a timeout error.
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return
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}
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}
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}
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}
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