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(2). 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 namevalue pairs.

snd ( TYPE, MSG [, FLAGS ] )

Place a message on the queue with the data from "MSG" and with type "TYPE". See msgsnd(2).

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) 2007−2013, 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.