main.go

     1  package main
     2  
     3  import (
     4  	"fmt"
     5  	"io"
     6  	"log"
     7  	"os"
     8  	"os/signal"
     9  	"syscall"
    10  	"time"
    11  )
    12  
    13  func main() {
    14  	// Ensure that this process terminates when the test times out,
    15  	// even if the expected signal never arrives.
    16  	go func() {
    17  		io.Copy(io.Discard, os.Stdin)
    18  		log.Fatal("stdin is closed; terminating")
    19  	}()
    20  
    21  	// Register to receive all signals.
    22  	c := make(chan os.Signal, 1)
    23  	signal.Notify(c)
    24  
    25  	// Get console window handle.
    26  	kernel32 := syscall.NewLazyDLL("kernel32.dll")
    27  	getConsoleWindow := kernel32.NewProc("GetConsoleWindow")
    28  	hwnd, _, err := getConsoleWindow.Call()
    29  	if hwnd == 0 {
    30  		log.Fatal("no associated console: ", err)
    31  	}
    32  
    33  	// Send message to close the console window.
    34  	const _WM_CLOSE = 0x0010
    35  	user32 := syscall.NewLazyDLL("user32.dll")
    36  	postMessage := user32.NewProc("PostMessageW")
    37  	ok, _, err := postMessage.Call(hwnd, _WM_CLOSE, 0, 0)
    38  	if ok == 0 {
    39  		log.Fatal("post message failed: ", err)
    40  	}
    41  
    42  	sig := <-c
    43  
    44  	// Allow some time for the handler to complete if it's going to.
    45  	//
    46  	// (In https://go.dev/issue/41884 the handler returned immediately,
    47  	// which caused Windows to terminate the program before the goroutine
    48  	// that received the SIGTERM had a chance to actually clean up.)
    49  	time.Sleep(time.Second)
    50  
    51  	// Print the signal's name: "terminated" makes the test succeed.
    52  	fmt.Println(sig)
    53  }
    54
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