IPC::Msg − SysV Msg IPC object class
use IPC::SysV
qw(IPC_PRIVATE S_IRUSR S_IWUSR);
use IPC::Msg;
$msg = IPC::Msg−>new(IPC_PRIVATE, S_IRUSR |
S_IWUSR);
$msg−>snd($msgtype, $msgdata);
$msg−>rcv($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
|
• |
"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(2). 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(2).
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
IPC::SysV, Class::Struct
Graham Barr <[email protected]>, Marcus Holland-Moritz <[email protected]>
Version 2.x, Copyright (C) 2007−2013, 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.