From: Bob Gustafson <bobgus@...>
Date: 2002-05-03T00:44:38+09:00
Subject: Re: How do I use IO.ioctl(arg1, arg2..)

Thanks very much for the clue on Termios.

I was using Termios on a SerialPort derived device and then printing out
everything inside the object. Nothing seemed to be changing and I was still
getting the echo.

The last line of your echo routine:

   Termios::setattr($stdin, Termios::TCSANOW, term)

seems to be the answer to my problem.

Thanks much

BobG

On Wed, 1 May 2002 23:04:04 -0700, Ian Macdonald wrote:
>On Thu 02 May 2002 at 14:39:11 +0900, Bob Gustafson wrote:

(Hmm, I wonder how my email date got screwed up..)

>
>> 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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>                            |