From: Ian Macdonald <ian@...>
Date: 2002-05-02T15:04:10+09:00
Subject: Re: How do I use IO.ioctl(arg1, arg2..)

On Thu 02 May 2002 at 14:39:11 +0900, Bob Gustafson wrote:

> The pickaxe book is a bit sparse on documentation for using the method
> ioctl for IO class objects.
> 
> Is there a guide somewhere?
> 
> I want to turn echo on and off on an IO object.
> 
> I guess I could use system("stty -F /dev/ttyS1 echo"), if I knew which
> physical device was inside a particular IO object.

You can also use the termios module for this, although documentation
is rather sparse there, too.

Here's how you would turn echo on/off for $stdin:

def echo(on)
  term = Termios::getattr($stdin)
  if on
    term.c_lflag |= Termios::ECHO
  else # off
    term.c_lflag &= ~Termios::ECHO
  end
  Termios::setattr($stdin, Termios::TCSANOW, term)
end

def get_passwd
  begin
    echo(false)
    print "Password: "
    $stdin.gets.chomp
  ensure
    echo(true)
    print "\n"
  end
end

Ian
-- 
Ian Macdonald               | A good plan today is better than a perfect 
ian@caliban.org             | plan tomorrow.   -- Patton 
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