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. 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
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.