IPC::Msg

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);

$msg->snd($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. 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 <[email protected]>, Marcus Holland-Moritz <[email protected]>

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.

© 1993–2016 Larry Wall and others
Licensed under the GNU General Public License version 1 or later, or the Artistic License.
The Perl logo is a trademark of the Perl Foundation.
https://perldoc.perl.org/5.20.2/IPC/Msg.html