signal_windows_test.go

Documentation: os/signal

     1  // Copyright 2012 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package signal
     6  
     7  import (
     8  	"bytes"
     9  	"internal/testenv"
    10  	"os"
    11  	"os/exec"
    12  	"path/filepath"
    13  	"syscall"
    14  	"testing"
    15  	"time"
    16  )
    17  
    18  func sendCtrlBreak(t *testing.T, pid int) {
    19  	d, e := syscall.LoadDLL("kernel32.dll")
    20  	if e != nil {
    21  		t.Fatalf("LoadDLL: %v\n", e)
    22  	}
    23  	p, e := d.FindProc("GenerateConsoleCtrlEvent")
    24  	if e != nil {
    25  		t.Fatalf("FindProc: %v\n", e)
    26  	}
    27  	r, _, e := p.Call(syscall.CTRL_BREAK_EVENT, uintptr(pid))
    28  	if r == 0 {
    29  		t.Fatalf("GenerateConsoleCtrlEvent: %v\n", e)
    30  	}
    31  }
    32  
    33  func TestCtrlBreak(t *testing.T) {
    34  	// create source file
    35  	const source = `
    36  package main
    37  
    38  import (
    39  	"log"
    40  	"os"
    41  	"os/signal"
    42  	"time"
    43  )
    44  
    45  
    46  func main() {
    47  	c := make(chan os.Signal, 10)
    48  	signal.Notify(c)
    49  	select {
    50  	case s := <-c:
    51  		if s != os.Interrupt {
    52  			log.Fatalf("Wrong signal received: got %q, want %q\n", s, os.Interrupt)
    53  		}
    54  	case <-time.After(3 * time.Second):
    55  		log.Fatalf("Timeout waiting for Ctrl+Break\n")
    56  	}
    57  }
    58  `
    59  	tmp := t.TempDir()
    60  
    61  	// write ctrlbreak.go
    62  	name := filepath.Join(tmp, "ctlbreak")
    63  	src := name + ".go"
    64  	f, err := os.Create(src)
    65  	if err != nil {
    66  		t.Fatalf("Failed to create %v: %v", src, err)
    67  	}
    68  	defer f.Close()
    69  	f.Write([]byte(source))
    70  
    71  	// compile it
    72  	exe := name + ".exe"
    73  	defer os.Remove(exe)
    74  	o, err := exec.Command(testenv.GoToolPath(t), "build", "-o", exe, src).CombinedOutput()
    75  	if err != nil {
    76  		t.Fatalf("Failed to compile: %v\n%v", err, string(o))
    77  	}
    78  
    79  	// run it
    80  	cmd := exec.Command(exe)
    81  	var b bytes.Buffer
    82  	cmd.Stdout = &b
    83  	cmd.Stderr = &b
    84  	cmd.SysProcAttr = &syscall.SysProcAttr{
    85  		CreationFlags: syscall.CREATE_NEW_PROCESS_GROUP,
    86  	}
    87  	err = cmd.Start()
    88  	if err != nil {
    89  		t.Fatalf("Start failed: %v", err)
    90  	}
    91  	go func() {
    92  		time.Sleep(1 * time.Second)
    93  		sendCtrlBreak(t, cmd.Process.Pid)
    94  	}()
    95  	err = cmd.Wait()
    96  	if err != nil {
    97  		t.Fatalf("Program exited with error: %v\n%v", err, string(b.Bytes()))
    98  	}
    99  }
   100
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