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.

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.

2021-05-23 perl v5.34.0