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