IPC::Msg(3perl) Perl Programmers Reference Guide IPC::Msg(3perl)
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 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
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.
perl v5.34.0 2023-11-23 IPC::Msg(3perl)
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