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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);
 
     $msg->snd(pack("l! a*",$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>

COPYRIGHT

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.