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// Copyright 2014 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package net
import (
"bufio"
"fmt"
"io"
"os"
"os/exec"
"syscall"
"testing"
"time"
)
func TestAcceptIgnoreSomeErrors(t *testing.T) {
recv := func(ln Listener) (string, error) {
c, err := ln.Accept()
if err != nil {
// Display windows errno in error message.
operr, ok := err.(*OpError)
if !ok {
return "", err
}
errno, ok := operr.Err.(syscall.Errno)
if !ok {
return "", err
}
return "", fmt.Errorf("%v (windows errno=%d)", err, errno)
}
defer c.Close()
b := make([]byte, 100)
n, err := c.Read(b)
if err != nil && err != io.EOF {
return "", err
}
return string(b[:n]), nil
}
send := func(addr string, data string) error {
c, err := Dial("tcp", addr)
if err != nil {
return err
}
defer c.Close()
b := []byte(data)
n, err := c.Write(b)
if err != nil {
return err
}
if n != len(b) {
return fmt.Errorf(`Only %d chars of string "%s" sent`, n, data)
}
return nil
}
if envaddr := os.Getenv("GOTEST_DIAL_ADDR"); envaddr != "" {
// In child process.
c, err := Dial("tcp", envaddr)
if err != nil {
t.Fatalf("Dial failed: %v", err)
}
fmt.Printf("sleeping\n")
time.Sleep(time.Minute) // process will be killed here
c.Close()
}
ln, err := Listen("tcp", "127.0.0.1:0")
if err != nil {
t.Fatalf("Listen failed: %v", err)
}
defer ln.Close()
// Start child process that connects to our listener.
cmd := exec.Command(os.Args[0], "-test.run=TestAcceptIgnoreSomeErrors")
cmd.Env = append(os.Environ(), "GOTEST_DIAL_ADDR="+ln.Addr().String())
stdout, err := cmd.StdoutPipe()
if err != nil {
t.Fatalf("cmd.StdoutPipe failed: %v", err)
}
err = cmd.Start()
if err != nil {
t.Fatalf("cmd.Start failed: %v\n", err)
}
outReader := bufio.NewReader(stdout)
for {
s, err := outReader.ReadString('\n')
if err != nil {
t.Fatalf("reading stdout failed: %v", err)
}
if s == "sleeping\n" {
break
}
}
defer cmd.Wait() // ignore error - we know it is getting killed
const alittle = 100 * time.Millisecond
time.Sleep(alittle)
cmd.Process.Kill() // the only way to trigger the errors
time.Sleep(alittle)
// Send second connection data (with delay in a separate goroutine).
result := make(chan error)
go func() {
time.Sleep(alittle)
err := send(ln.Addr().String(), "abc")
if err != nil {
result <- err
}
result <- nil
}()
defer func() {
err := <-result
if err != nil {
t.Fatalf("send failed: %v", err)
}
}()
// Receive first or second connection.
s, err := recv(ln)
if err != nil {
t.Fatalf("recv failed: %v", err)
}
switch s {
case "":
// First connection data is received, lets get second connection data.
case "abc":
// First connection is lost forever, but that is ok.
return
default:
t.Fatalf(`"%s" received from recv, but "" or "abc" expected`, s)
}
// Get second connection data.
s, err = recv(ln)
if err != nil {
t.Fatalf("recv failed: %v", err)
}
if s != "abc" {
t.Fatalf(`"%s" received from recv, but "abc" expected`, s)
}
}
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