The following perl script takes a long time in the 'getc' function while executing in an HP-UX 11i v2 (Itanium) machine.

*** BEGIN SCRIPT ***

#! /usr/local/bin/perl -w
use strict;
use DBI;
use POSIX qw(strftime);
use IO::Handle;


$_=`uname -s -r`; chomp; tr/ /_/;
my $sttycooked = `/bin/stty -g`;

sub prompt {
    # print string $_[0], and look for one of the chars in $[1 .. $#_]
    return (-1) unless (@_ > 1);
    while (1){
        print "$_[0] ";
        system "/bin/stty -icanon eol \001";
        my $x = getc(STDIN);
        system "/bin/stty $sttycooked";
        for my $i (1 .. $#_){
            return( -1) if (length( $_[$i]) > 1);
            return( $x) if ($x eq $_[$i]);
        }
    }
}

# main
$_ = prompt ("Build 64bit version? (y/n)","y","n");

if (/[yY]/) {
        print "You have choosen 64bit version\n";
}
else {
        print "You have choosen 32bit version\n";
}
[download]

*** END SCRIPT ***

Is there any known performance problem about it?

Thanks in advance!

20060719 Janitored by Corion: Added formatting, code tags, as per Writeup Formatting Tips