IPC::Msg.3pm

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Version: 2010-09-06 (fedora - 01/12/10)

Section: 3 (Bibliothèques de fonctions)

Sommaire

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);
 
     $msg->snd(pack("l! a*",$msgtype,$msg));
 
     $msg->rcv($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> Version 2.x, Copyright (C) 2007, 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.