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

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

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.

Returns the system message queue identifier.
Read a message from the queue. Returns the type of the message read. See msgrcv(2). The BUF becomes tainted.
Remove and destroy the message queue from the system.
"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.

Place a message on the queue with the data from "MSG" and with type "TYPE". See msgsnd(2).
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.

2021-04-29 perl v5.32.1