IPC::Msg - SysV Msg IPC object class
use IPC::SysV qw(IPC_PRIVATE S_IRUSR S_IWUSR); use IPC::Msg; $msg = new IPC::Msg(IPC_PRIVATE, S_IRUSR | S_IWUSR); $msg->snd(pack("l! a*",$msgtype,$msg)); $msg->rcv($buf,256); $ds = $msg->stat; $msg->remove;
A class providing an object based interface to SysV IPC message queues.
- new ( KEY , FLAGS )
Creates a new message queue associated with
KEY. A new queue is created if
KEYis equal to
KEYdoes not already have a message queue associated with it, and
FLAGS & IPC_CREATis true.
On creation of a new message queue
FLAGSis 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.
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 and destroy the message queue from the system.
- set ( STAT )
- set ( NAME => VALUE [, NAME => VALUE ...] )
setwill set the following values of the
statstructure associated with the message queue.
uid gid mode (oly the permission bits) qbytes
setaccepts either a stat object, as returned by the
statmethod, or a list of name-value pairs.
- snd ( TYPE, MSG [, FLAGS ] )
Place a message on the queue with the data from
MSGand with type
TYPE. See msgsnd.
Returns an object of type
IPC::Msg::statwhich 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
Graham Barr <email@example.com>
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.