Manpages - IPC_Msg.3perl

IPC::Msg - SysV Msg IPC object class

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;

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

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 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).

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

IPC::SysV, Class::Struct

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

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.