switch runtime.GOOS {
	case "darwin", "dragonfly", "freebsd", "linux", "netbsd", "openbsd":
	default:
		t.Skipf("skipping test on %s", runtime.GOOS)
	}
	output := runTestProg(t, "testprognet", "SignalDuringExec")
	want := "OK\n"
	if output != want {
		t.Fatalf("want %s, got %s\n", want, output)
	}
}

func TestSignalM(t *testing.T) {
	r, w, errno := runtime.Pipe()
	if errno != 0 {