HOW-TO watch log files with perl/EV for a fixed amount of time (timeout)?

Lars Holowko Lars.Holowko at
Fri May 21 01:54:05 CEST 2010

Hi everybody,


I just stumbled over EV. What I am trying to accomplish is this:


Monitor and process a couple of log files (and react on keywords) with a


I was trying to get things working with something down the line of


my $fn = "tail -f /var/log/messages";

open my $fh, '-|', $fn or croak "Can't open $fn: $::OS_ERROR";


my $watcher = EV::io $fh, EV::READ, sub {

      my ($watcher, $revents) = @_;

      warn "yeah, /var/log/messages should now be readable without

      my $fh = $watcher->fh;

      print <$fh>;

      warn "HUH\n";



my $timeout = EV::timer 20, 0, sub {

      warn "DONE after 20 secs\n";






But that didn't work.



Any hint would be highly appreciated.






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