IPC::Msg(3pm)

NAME

IPC::Msg - SysV Msg IPC object class

SYNOPSIS

    use IPC::SysV qw(IPC_PRIVATE S_IRWXU S_IRWXG S_IRWXO);
    use IPC::Msg;
    
    $msg = new IPC::Msg(IPC_PRIVATE, S_IRWXU ⎪ S_IRWXG ⎪ S_IRWXO);
    
    $msg->snd(pack("L a*",$msgtype,$msg));
    
    $msg->rcv($buf,256);
    
    $ds = $msg->stat;
    
    $msg->remove;

DESCRIPTION

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 the msgrcv manpage

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 the msgsnd manpage.

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

the IPC::SysV manpage the Class::Struct manpage

AUTHOR

Graham Barr <[email protected]>

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.