IPC::Msg3pm

Sysv msg ipc object class

Usage

    use IPC::SysV qw(IPC_PRIVATE S_IRWXU S_IRWXG S_IRWXO);
    use IPC::Msg;
    
    $msg = new IPC::Msg(IPC_PRIVATE, S_IRWXU ⎪ S_IRWXG ⎪ S_IRWXO);
    
    $msg->snd(pack("L a*",$msgtype,$msg));
    
    $msg->rcv($buf,256);
    
    $ds = $msg->stat;
    
    $msg->remove;

Overview

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.

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 the msgrcv manpage

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 the msgsnd manpage.

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