signal_windows_test.go

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