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IO::Socket::UNIX(3perl) Perl Programmers Reference Guide IO::Socket::UNIX(3perl)


IO::Socket::UNIX - Object interface for AF_UNIX domain sockets


    use IO::Socket::UNIX;
    my $SOCK_PATH = "$ENV{HOME}/unix-domain-socket-test.sock";
    # Server:
    my $server = IO::Socket::UNIX->new(
        Type => SOCK_STREAM(),
        Local => $SOCK_PATH,
        Listen => 1,
    my $count = 1;
    while (my $conn = $server->accept()) {
        $conn->print("Hello " . ($count++) . "\n");
    # Client:
    my $client = IO::Socket::UNIX->new(
        Type => SOCK_STREAM(),
        Peer => $SOCK_PATH,
    # Now read and write from $client


"IO::Socket::UNIX" provides an object interface to creating and using sockets in the AF_UNIX domain. It is built upon the IO::Socket interface and inherits all the methods defined by IO::Socket.


Creates an "IO::Socket::UNIX" object, which is a reference to a newly created symbol (see the "Symbol" package). "new" optionally takes arguments, these arguments are in key-value pairs.

In addition to the key-value pairs accepted by IO::Socket, "IO::Socket::UNIX" provides.

    Type        Type of socket (eg SOCK_STREAM or SOCK_DGRAM)
    Local       Path to local fifo
    Peer        Path to peer fifo
    Listen      Queue size for listen

If the constructor is only passed a single argument, it is assumed to be a "Peer" specification.

If the "Listen" argument is given, but false, the queue size will be set to 5.


Returns the pathname to the fifo at the local end
Returns the pathanme to the fifo at the peer end


Socket, IO::Socket


Graham Barr. Currently maintained by the Perl Porters. Please report all bugs to <>.


Copyright (c) 1996-8 Graham Barr <>. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

2021-09-24 perl v5.32.1