# IPC::Msg - man - phpman

## NAME
    [IPC::Msg](https://www.chedong.com/phpMan.php/perldoc/IPC%3A%3AMsg/markdown) - SysV Msg IPC object class

## SYNOPSIS
        use [IPC::SysV](https://www.chedong.com/phpMan.php/perldoc/IPC%3A%3ASysV/markdown) qw(IPC_PRIVATE S_IRUSR S_IWUSR);
        use [IPC::Msg](https://www.chedong.com/phpMan.php/perldoc/IPC%3A%3AMsg/markdown);

        $msg = [IPC::Msg](https://www.chedong.com/phpMan.php/perldoc/IPC%3A%3AMsg/markdown)->new(IPC_PRIVATE, S_IRUSR | S_IWUSR);

        $msg->snd($msgtype, $msgdata);

        $msg->rcv($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(2)](https://www.chedong.com/phpMan.php/man/msgrcv/2/markdown). 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(2)](https://www.chedong.com/phpMan.php/man/msgsnd/2/markdown).

    stat
        Returns an object of type "[IPC::Msg::stat](https://www.chedong.com/phpMan.php/perldoc/IPC%3A%3AMsg%3A%3Astat/markdown)" which is a sub-class of "[Class::Struct](https://www.chedong.com/phpMan.php/perldoc/Class%3A%3AStruct/markdown)". 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](https://www.chedong.com/phpMan.php/perldoc/IPC%3A%3ASysV/markdown), [Class::Struct](https://www.chedong.com/phpMan.php/perldoc/Class%3A%3AStruct/markdown)

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

## COPYRIGHT
    Version 2.x, Copyright (C) 2007-2013, 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.