text: // +build linux
  // +build !appengine
  
  package isatty
  
  import (
  	"syscall"
  	"unsafe"
  )
  
  const ioctlReadTermios = syscall.TCGETS
  
  // IsTerminal return true if the file descriptor is terminal.
  func IsTerminal(fd uintptr) bool {
  	var termios syscall.Termios
  	_, _, err := syscall.Syscall6(syscall.SYS_IOCTL, fd, ioctlReadTermios, uintptr(unsafe.Pointer(&termios)), 0, 0, 0)
  	return err == 0
  }
  