time limited STDIN

[Saurabh Singhvi]

Hi all,

I wanted to know a way of taking a time limited STDIN. Say for eg
after 3 seconds, the STDIN should stop waiting and move forward.

How do I do this??

I was trying with

unless ($child) {
       sleep($waittime);
       `echo "\n"`;
       exit 0;
   }
$ans = <STDIN>;

but this didn't work out. So please help me

thanks
Saurabh