os: add handling of os.Interrupt for windows

Add GenerateConsoleCtrlEvent call to internal syscall package.
Define ErrProcessDone while reviewing handling of os.Signal().
Update test to run for windows using the added call.

Fixes #42311
Fixes #46354

Change-Id: I460955efc76c4febe04b612ac9a0670e62ba5ff3
Reviewed-on: https://go-review.googlesource.com/c/go/+/367495
Trust: Patrik Nyblom <pnyb@google.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

1 files changed, 18 insertions, 0 deletions

diff --git a/src/os/exec/exec_windows_test.go b/src/os/exec/exec_windows_test.go
index 8e31e47190..503867f9c8 100644
--- a/src/os/exec/exec_windows_test.go
+++ b/src/os/exec/exec_windows_test.go
@@ -7,6 +7,7 @@
 package exec_test
 
 import (
+	"internal/testenv"
 	"io"
 	"os"
 	"os/exec"
@@ -54,3 +55,20 @@ func TestNoInheritHandles(t *testing.T) {
 		t.Fatalf("got exit code %d; want 88", exitError.ExitCode())
 	}
 }
+
+func TestErrProcessDone(t *testing.T) {
+	testenv.MustHaveGoBuild(t)
+	// On Windows, ProcAttr cannot be empty
+	p, err := os.StartProcess(testenv.GoToolPath(t), []string{""},
+		&os.ProcAttr{Dir: "", Env: nil, Files: []*os.File{os.Stdin, os.Stdout, os.Stderr}, Sys: nil})
+	if err != nil {
+		t.Errorf("starting test process: %v", err)
+	}
+	_, err = p.Wait()
+	if err != nil {
+		t.Errorf("Wait: %v", err)
+	}
+	if got := p.Signal(os.Kill); got != os.ErrProcessDone {
+		t.Fatalf("got %v want %v", got, os.ErrProcessDone)
+	}
+}