1IPC::Msg(3)           User Contributed Perl Documentation          IPC::Msg(3)
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NAME

6       IPC::Msg - SysV Msg IPC object class
7

SYNOPSIS

9           use IPC::SysV qw(IPC_PRIVATE S_IRUSR S_IWUSR);
10           use IPC::Msg;
11
12           $msg = IPC::Msg->new(IPC_PRIVATE, S_IRUSR | S_IWUSR);
13
14           $msg->snd($msgtype, $msgdata);
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16           $msg->rcv($buf, 256);
17
18           $ds = $msg->stat;
19
20           $msg->remove;
21

DESCRIPTION

23       A class providing an object based interface to SysV IPC message queues.
24

METHODS

26       new ( KEY , FLAGS )
27           Creates a new message queue associated with "KEY". A new queue is
28           created if
29
30           •   "KEY" is equal to "IPC_PRIVATE"
31
32           •   "KEY" does not already have a message queue associated with it,
33               and "FLAGS & IPC_CREAT" is true.
34
35           On creation of a new message queue "FLAGS" is used to set the
36           permissions.  Be careful not to set any flags that the Sys V IPC
37           implementation does not allow: in some systems setting execute bits
38           makes the operations fail.
39
40       id  Returns the system message queue identifier.
41
42       rcv ( BUF, LEN [, TYPE [, FLAGS ]] )
43           Read a message from the queue. Returns the type of the message
44           read.  See msgrcv(2).  The BUF becomes tainted.
45
46       remove
47           Remove and destroy the message queue from the system.
48
49       set ( STAT )
50       set ( NAME => VALUE [, NAME => VALUE ...] )
51           "set" will set the following values of the "stat" structure
52           associated with the message queue.
53
54               uid
55               gid
56               mode (oly the permission bits)
57               qbytes
58
59           "set" accepts either a stat object, as returned by the "stat"
60           method, or a list of name-value pairs.
61
62       snd ( TYPE, MSG [, FLAGS ] )
63           Place a message on the queue with the data from "MSG" and with type
64           "TYPE".  See msgsnd(2).
65
66       stat
67           Returns an object of type "IPC::Msg::stat" which is a sub-class of
68           "Class::Struct". It provides the following fields. For a
69           description of these fields see you system documentation.
70
71               uid
72               gid
73               cuid
74               cgid
75               mode
76               qnum
77               qbytes
78               lspid
79               lrpid
80               stime
81               rtime
82               ctime
83

SEE ALSO

85       IPC::SysV, Class::Struct
86

AUTHORS

88       Graham Barr <gbarr@pobox.com>, Marcus Holland-Moritz <mhx@cpan.org>
89

91       Version 2.x, Copyright (C) 2007-2013, Marcus Holland-Moritz.
92
93       Version 1.x, Copyright (c) 1997, Graham Barr.
94
95       This program is free software; you can redistribute it and/or modify it
96       under the same terms as Perl itself.
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100perl v5.38.0                      2023-07-20                       IPC::Msg(3)
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