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# IPC::Msg

Perl 5 version 26.0 documentation
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# IPC::Msg

- NAME
- SYNOPSIS
- DESCRIPTION
- METHODS
- SEE ALSO
- AUTHORS
- COPYRIGHT

# 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.

Page index

- NAME
- SYNOPSIS
- DESCRIPTION
- METHODS
- SEE ALSO
- AUTHORS
- COPYRIGHT