IPC::Msg(3p)

NAME
IPC::Msg - SysV Msg IPC object class

SYNOPSIS
    use IPC::SysV qw(IPC_PRIVATE S_IRUSR S_IWUSR);
    use IPC::Msg;

    $msg = IPC::Msg->new(IPC_PRIVATE, S_IRUSR | S_IWUSR);

    $msg->snd(pack("l! a*",$msgtype,$msg));

    $msg->rcv($buf,256);

    $ds = $msg->stat;

    $msg->remove;

DESCRIPTION
A class providing an object based interface to SysV IPC message queues.

METHODS

new ( KEY , FLAGS )
    Creates a new message queue associated with "KEY". A new queue is created if

    •   "KEY" is equal to "IPC_PRIVATE"

    •   "KEY" does not already have a message queue associated with it, and "FLAGS & IPC_CREAT" is true.

    On creation of a new message queue "FLAGS" is used to set the permissions. Be careful not to set any flags that the Sys V IPC implementation does not allow: in some systems setting execute bits makes the operations fail.

id  Returns the system message queue identifier.

rcv ( BUF, LEN [, TYPE [, FLAGS ]] )
    Read a message from the queue. Returns the type of the message read. See msgrcv. The BUF becomes tainted.

remove
    Remove and destroy the message queue from the system.

set ( STAT )
set ( NAME => VALUE [, NAME => VALUE ...] )
    "set" will set the following values of the "stat" structure associated with the message queue.

        uid
        gid
        mode (oly the permission bits)
        qbytes

    "set" accepts either a stat object, as returned by the "stat" method, or a list of name-value pairs.

snd ( TYPE, MSG [, FLAGS ] )
    Place a message on the queue with the data from "MSG" and with type "TYPE". See msgsnd.

stat
    Returns an object of type "IPC::Msg::stat" which is a sub-class of "Class::Struct". It provides the following fields. For a description of these fields see you system documentation.

        uid
        gid
        cuid
        cgid
        mode
        qnum
        qbytes
        lspid
        lrpid
        stime
        rtime
        ctime

SEE ALSO
IPC::SysV, Class::Struct

AUTHORS
Graham Barr <gbarr@pobox.com>, Marcus Holland-Moritz <mhx@cpan.org>

COPYRIGHT
Version 2.x, Copyright (C) 2007, Marcus Holland-Moritz.

Version 1.x, Copyright (c) 1997, Graham Barr.

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