IPC::Msg

Section: User Contributed Perl Documentation (3)
Updated: 2020-07-28
Page Index
 

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);

    $msg->snd($msgtype, $msgdata);

    $msg->rcv($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. 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

 

SEE ALSO

IPC::SysV, Class::Struct  

AUTHORS

Graham Barr <gbarr@pobox.com>, Marcus Holland-Moritz <mhx@cpan.org>  

COPYRIGHT

Version 2.x, Copyright (C) 2007-2013, 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.


 

Index

NAME
SYNOPSIS
DESCRIPTION
METHODS
SEE ALSO
AUTHORS
COPYRIGHT