IPC::Msg(3perl) Perl Programmers Reference Guide 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.

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.

Returns the system message queue identifier.
Read a message from the queue. Returns the type of the message read. See msgrcv(2). The BUF becomes tainted.
Remove and destroy the message queue from the system.
"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.

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

2022-05-29 perl v5.36.0