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IPC::Msg

Section: Perl Programmers Reference Guide (3)
Updated: 2001-09-21
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NAME

IPC::Msg - SysV Msg IPC object class  

SYNOPSIS

    use IPC::SysV qw(IPC_PRIVATE S_IRWXU);
    use IPC::Msg;

    $msg = new IPC::Msg(IPC_PRIVATE, S_IRWXU);

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

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  

AUTHOR

Graham Barr <gbarr@pobox.com>  

COPYRIGHT

Copyright (c) 1997 Graham Barr. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.


 

Index

NAME
SYNOPSIS
DESCRIPTION
METHODS
SEE ALSO
AUTHOR
COPYRIGHT