process_windows.go

//go:build windows

package main

import (
	"errors"
	"fmt"
	"os/exec"
	"syscall"

	"golang.org/x/sys/windows"
)

const windowsCreateNoWindow = 0x08000000

func hideSubprocessWindow(cmd *exec.Cmd) {
	if cmd == nil {
		return
	}
	if cmd.SysProcAttr == nil {
		cmd.SysProcAttr = &syscall.SysProcAttr{}
	}
	cmd.SysProcAttr.CreationFlags |= windowsCreateNoWindow
}

func processIDRunning(pid int) (bool, error) {
	handle, err := windows.OpenProcess(windows.SYNCHRONIZE, false, uint32(pid))
	if err != nil {
		switch {
		case errors.Is(err, windows.ERROR_INVALID_PARAMETER):
			return false, nil
		case errors.Is(err, windows.ERROR_ACCESS_DENIED):
			return true, nil
		default:
			return false, err
		}
	}
	defer windows.CloseHandle(handle)
	state, err := windows.WaitForSingleObject(handle, 0)
	if err != nil {
		return false, err
	}
	switch state {
	case uint32(windows.WAIT_TIMEOUT):
		return true, nil
	case windows.WAIT_OBJECT_0:
		return false, nil
	default:
		return false, fmt.Errorf("unexpected process wait state %d", state)
	}
}