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.\"
.IX Title "IPC::Msg 3pm"
.TH IPC::Msg 3pm 2023-11-28 "perl v5.38.2" "Perl Programmers Reference Guide"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.nh
.SH NAME
IPC::Msg \- SysV Msg IPC object class
.SH SYNOPSIS
.IX Header "SYNOPSIS"
.Vb 2
\&    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;
.Ve
.SH DESCRIPTION
.IX Header "DESCRIPTION"
A class providing an object based interface to SysV IPC message queues.
.SH METHODS
.IX Header "METHODS"
.IP "new ( KEY , FLAGS )" 4
.IX Item "new ( KEY , FLAGS )"
Creates a new message queue associated with \f(CW\*(C`KEY\*(C'\fR. A new queue is
created if
.RS 4
.IP \(bu 4
\&\f(CW\*(C`KEY\*(C'\fR is equal to \f(CW\*(C`IPC_PRIVATE\*(C'\fR
.IP \(bu 4
\&\f(CW\*(C`KEY\*(C'\fR does not already have a message queue associated with
it, and \f(CW\*(C`\fR\f(CIFLAGS\fR\f(CW & IPC_CREAT\*(C'\fR is true.
.RE
.RS 4
.Sp
On creation of a new message queue \f(CW\*(C`FLAGS\*(C'\fR 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.
.RE
.IP id 4
.IX Item "id"
Returns the system message queue identifier.
.IP "rcv ( BUF, LEN [, TYPE [, FLAGS ]] )" 4
.IX Item "rcv ( BUF, LEN [, TYPE [, FLAGS ]] )"
Read a message from the queue. Returns the type of the message read.
See \fBmsgrcv\fR\|(2).  The BUF becomes tainted.
.IP remove 4
.IX Item "remove"
Remove and destroy the message queue from the system.
.IP "set ( STAT )" 4
.IX Item "set ( STAT )"
.PD 0
.IP "set ( NAME => VALUE [, NAME => VALUE ...] )" 4
.IX Item "set ( NAME => VALUE [, NAME => VALUE ...] )"
.PD
\&\f(CW\*(C`set\*(C'\fR will set the following values of the \f(CW\*(C`stat\*(C'\fR structure associated
with the message queue.
.Sp
.Vb 4
\&    uid
\&    gid
\&    mode (oly the permission bits)
\&    qbytes
.Ve
.Sp
\&\f(CW\*(C`set\*(C'\fR accepts either a stat object, as returned by the \f(CW\*(C`stat\*(C'\fR method,
or a list of \fIname\fR\-\fIvalue\fR pairs.
.IP "snd ( TYPE, MSG [, FLAGS ] )" 4
.IX Item "snd ( TYPE, MSG [, FLAGS ] )"
Place a message on the queue with the data from \f(CW\*(C`MSG\*(C'\fR and with type \f(CW\*(C`TYPE\*(C'\fR.
See \fBmsgsnd\fR\|(2).
.IP stat 4
.IX Item "stat"
Returns an object of type \f(CW\*(C`IPC::Msg::stat\*(C'\fR which is a sub-class of
\&\f(CW\*(C`Class::Struct\*(C'\fR. It provides the following fields. For a description
of these fields see you system documentation.
.Sp
.Vb 12
\&    uid
\&    gid
\&    cuid
\&    cgid
\&    mode
\&    qnum
\&    qbytes
\&    lspid
\&    lrpid
\&    stime
\&    rtime
\&    ctime
.Ve
.SH "SEE ALSO"
.IX Header "SEE ALSO"
IPC::SysV, Class::Struct
.SH AUTHORS
.IX Header "AUTHORS"
Graham Barr <gbarr@pobox.com>,
Marcus Holland-Moritz <mhx@cpan.org>
.SH COPYRIGHT
.IX Header "COPYRIGHT"
Version 2.x, Copyright (C) 2007\-2013, Marcus Holland-Moritz.
.PP
Version 1.x, Copyright (c) 1997, Graham Barr.
.PP
This program is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.