op-geth/vendor/github.com/mattn/go-isatty/isatty_windows.go

// +build windows
// +build !appengine

package isatty

import (
	"syscall"
	"unsafe"
)

var kernel32 = syscall.NewLazyDLL("kernel32.dll")
var procGetConsoleMode = kernel32.NewProc("GetConsoleMode")

// IsTerminal return true if the file descriptor is terminal.
func IsTerminal(fd uintptr) bool {
	var st uint32
	r, _, e := syscall.Syscall(procGetConsoleMode.Addr(), 2, fd, uintptr(unsafe.Pointer(&st)), 0)
	return r != 0 && e == 0
}