while ( defined( my $line = <STDIN> ) ) {

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Just a quick side note:  you don't need the defined here. Perl has some DWIMmery in place for this case, to always act as if the defined was there, even if you don't write it: 

$ perl -MO=Deparse -e 'while ( my $line = <STDIN> ) { print $line }'

while (defined(my $line = <STDIN>)) {
    do {
        print $line
    };
}
-e syntax OK

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In reply to Re^2: How to read pcap data from stream not from files. by almut
in thread How to read pcap data from stream not from files. by darcy95

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