/usr/share/doc/libio-async-perl/examples/echo-server.pl is in libio-async-perl 0.64-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 | #!/usr/bin/perl
use strict;
use warnings;
use Getopt::Long;
use IO::Async::Loop;
use IO::Async::Listener;
my $PORT = 12345;
my $FAMILY;
my $V6ONLY;
GetOptions(
'port|p=i' => \$PORT,
'4' => sub { $FAMILY = "inet" },
'6' => sub { $FAMILY = "inet6" },
'v6only=i' => \$V6ONLY,
) or exit 1;
my $loop = IO::Async::Loop->new;
my $listener = IO::Async::Listener->new(
on_stream => sub {
my $self = shift;
my ( $stream ) = @_;
my $socket = $stream->read_handle;
my $peeraddr = $socket->peerhost . ":" . $socket->peerport;
print STDERR "Accepted new connection from $peeraddr\n";
$stream->configure(
on_read => sub {
my ( $self, $buffref, $eof ) = @_;
while( $$buffref =~ s/^(.*\n)// ) {
# eat a line from the stream input
$self->write( $1 );
}
return 0;
},
on_closed => sub {
print STDERR "Connection from $peeraddr closed\n";
},
);
$loop->add( $stream );
},
);
$loop->add( $listener );
$listener->listen(
service => $PORT,
socktype => 'stream',
family => $FAMILY,
v6only => $V6ONLY,
on_resolve_error => sub { die "Cannot resolve - $_[0]\n"; },
on_listen_error => sub { die "Cannot listen\n"; },
);
$loop->run;
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