Bareword "WNOHANG" not allowed while "strict subs" in use 

##</code><code>##

#!/usr/bin/perl

# always uses these;
use strict;
use warnings;

# and detect errors 
use autodie;

pipe(READER, WRITE);
my $pid =fork();
if ($pid)
{
        print "In parent\n";
        close WRITE;
        my $val1 = 100;
        while(my $num = <READER>)
        {
                print "in while; $num\n";
        }
        close(READER);
        wait;
}
else
{
        print "In child\n";
        my $val2 = 150;
        print WRITE "$val2\n";
        close(WRITE);
        print "Child closed write\n";
}