


IPC::Msg(3p)     Perl Programmers Reference Guide    IPC::Msg(3p)


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

           o   "KEY" is equal to "IPC_PRIVATE"

           o   "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.






perl v5.10.1                2009-10-12                          1





IPC::Msg(3p)     Perl Programmers Reference Guide    IPC::Msg(3p)


               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.












perl v5.10.1                2009-10-12                          2


