NAME

IPC::Msg - SysV Msg IPC object class

SYNOPSIS

use IPC::SysV qw(IPC_PRIVATE S_IRWXU);
use IPC::Msg;

$msg = new IPC::Msg(IPC_PRIVATE, S_IRWXU);

$msg->snd(pack("l! a*",$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.

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

AUTHOR

Graham Barr <gbarr@pobox.com>

COPYRIGHT

Copyright (c) 1997 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.