NAME

Net::EmptyPort - find a free TCP/UDP port

SYNOPSIS

use Net::EmptyPort qw(empty_port check_port);

# get a random free port
my $port = empty_port();

# check if a port is already used
if (check_port(5000)) {
    say "Port 5000 already in use";
}

DESCRIPTION

Net::EmptyPort helps finding an empty TCP/UDP port.

METHODS

empty_port

my $port = empty_port();

Get the available port number, you can use.

Normally, empty_port() finds empty port number from 49152..65535. See http://www.iana.org/assignments/port-numbers

But you want to use another range, use a following form:

# 5963..65535
my $port = empty_port(5963);

You can also find an empty UDP port by specifying the protocol as the second parameter:

my $port = empty_port(1024, 'udp');
# use 49152..65535 range
my $port = empty_port(undef, 'udp');

check_port

my $true_or_false = check_port(5000);

Checks if the given port is already in use. Returns true if it is in use (i.e. if the port is NOT free). Returns false if the port is free.

Also works for UDP:

my $true_or_false = check_port(5000, 'udp');

wait_port($port:Int[, $sleep:Number, $retry:Int, $proto:String])

Waits for a particular port is available for connect.

This method waits the $port number is ready to accept a request.

$port is a port number to check.

Sleep $sleep seconds after check the port. You can specify $sleep in floating number.

And, retry $retry times.

Return value : Return true if the port is available, false otherwise.

AUTHOR

Tokuhiro Matsuno <tokuhirom@gmail.com>

THANKS TO

kazuhooku

dragon3

charsbar

Tatsuhiko Miyagawa

lestrrat

SEE ALSO

LICENSE

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.