use strict; use warnings; use IO::Select qw( ); use IO::Socket qw( ); my $lsn = IO::Socket::INET->new(Listen => 1, LocalPort => 8080); my $sel = IO::Select->new( $lsn ); my ($r_ready, $w_ready, $e_ready) = IO::Select->select($sel, undef, undef, 2.2) or die("Can't select: (" . (0+$!) . ") $!\n"); if (@$r_ready + @$w_ready + @$e_ready == 0) { print("Timeout\n"); } else { print("Num readers ready: ", 0+@$r_ready, "\n"); print("Num writers ready: ", 0+@$w_ready, "\n"); print("Num errors ready: ", 0+@$e_ready, "\n"); }