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Source file src/os/signal/signal_windows_test.go

Documentation: os/signal

  // Copyright 2012 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 signal
  
  import (
  	"bytes"
  	"internal/testenv"
  	"io/ioutil"
  	"os"
  	"os/exec"
  	"path/filepath"
  	"syscall"
  	"testing"
  	"time"
  )
  
  func sendCtrlBreak(t *testing.T, pid int) {
  	d, e := syscall.LoadDLL("kernel32.dll")
  	if e != nil {
  		t.Fatalf("LoadDLL: %v\n", e)
  	}
  	p, e := d.FindProc("GenerateConsoleCtrlEvent")
  	if e != nil {
  		t.Fatalf("FindProc: %v\n", e)
  	}
  	r, _, e := p.Call(syscall.CTRL_BREAK_EVENT, uintptr(pid))
  	if r == 0 {
  		t.Fatalf("GenerateConsoleCtrlEvent: %v\n", e)
  	}
  }
  
  func TestCtrlBreak(t *testing.T) {
  	// create source file
  	const source = `
  package main
  
  import (
  	"log"
  	"os"
  	"os/signal"
  	"time"
  )
  
  
  func main() {
  	c := make(chan os.Signal, 10)
  	signal.Notify(c)
  	select {
  	case s := <-c:
  		if s != os.Interrupt {
  			log.Fatalf("Wrong signal received: got %q, want %q\n", s, os.Interrupt)
  		}
  	case <-time.After(3 * time.Second):
  		log.Fatalf("Timeout waiting for Ctrl+Break\n")
  	}
  }
  `
  	tmp, err := ioutil.TempDir("", "TestCtrlBreak")
  	if err != nil {
  		t.Fatal("TempDir failed: ", err)
  	}
  	defer os.RemoveAll(tmp)
  
  	// write ctrlbreak.go
  	name := filepath.Join(tmp, "ctlbreak")
  	src := name + ".go"
  	f, err := os.Create(src)
  	if err != nil {
  		t.Fatalf("Failed to create %v: %v", src, err)
  	}
  	defer f.Close()
  	f.Write([]byte(source))
  
  	// compile it
  	exe := name + ".exe"
  	defer os.Remove(exe)
  	o, err := exec.Command(testenv.GoToolPath(t), "build", "-o", exe, src).CombinedOutput()
  	if err != nil {
  		t.Fatalf("Failed to compile: %v\n%v", err, string(o))
  	}
  
  	// run it
  	cmd := exec.Command(exe)
  	var b bytes.Buffer
  	cmd.Stdout = &b
  	cmd.Stderr = &b
  	cmd.SysProcAttr = &syscall.SysProcAttr{
  		CreationFlags: syscall.CREATE_NEW_PROCESS_GROUP,
  	}
  	err = cmd.Start()
  	if err != nil {
  		t.Fatalf("Start failed: %v", err)
  	}
  	go func() {
  		time.Sleep(1 * time.Second)
  		sendCtrlBreak(t, cmd.Process.Pid)
  	}()
  	err = cmd.Wait()
  	if err != nil {
  		t.Fatalf("Program exited with error: %v\n%v", err, string(b.Bytes()))
  	}
  }
  

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