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authorJarkko Hietaniemi <jhi@iki.fi>1998-07-07 05:32:53 +0300
committerGurusamy Sarathy <gsar@cpan.org>1998-07-08 07:12:47 +0000
commit0ade19845bc827615a636e5c073d498c2244ec07 (patch)
treeb25ebb72b2e377b5783ce95110d54bd7c6bfc6c5 /ext/IPC/SysV/Msg.pm
parent569536030df0016c037f85e8e6d3ef93f000c47a (diff)
downloadperl-0ade19845bc827615a636e5c073d498c2244ec07.tar.gz
add extension to support SysV IPC
Message-Id: <199807062332.CAA25792@alpha.hut.fi> Subject: [PATCH] 5.004_70: IPC::SysV p4raw-id: //depot/perl@1372
Diffstat (limited to 'ext/IPC/SysV/Msg.pm')
-rw-r--r--ext/IPC/SysV/Msg.pm223
1 files changed, 223 insertions, 0 deletions
diff --git a/ext/IPC/SysV/Msg.pm b/ext/IPC/SysV/Msg.pm
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+# IPC::Msg.pm
+#
+# Copyright (c) 1997 Graham Barr <gbarr@pobox.com>. All rights reserved.
+# This program is free software; you can redistribute it and/or
+# modify it under the same terms as Perl itself.
+
+package IPC::Msg;
+
+use IPC::SysV qw(IPC_STAT IPC_SET IPC_RMID);
+use strict;
+use vars qw($VERSION);
+use Carp;
+
+$VERSION = "1.00";
+
+{
+ package IPC::Msg::stat;
+
+ use Class::Struct qw(struct);
+
+ struct 'IPC::Msg::stat' => [
+ uid => '$',
+ gid => '$',
+ cuid => '$',
+ cgid => '$',
+ mode => '$',
+ qnum => '$',
+ qbytes => '$',
+ lspid => '$',
+ lrpid => '$',
+ stime => '$',
+ rtime => '$',
+ ctime => '$',
+ ];
+}
+
+sub new {
+ @_ == 3 || croak 'new IPC::Msg ( KEY , FLAGS )';
+ my $class = shift;
+
+ my $id = msgget($_[0],$_[1]);
+
+ defined($id)
+ ? bless \$id, $class
+ : undef;
+}
+
+sub id {
+ my $self = shift;
+ $$self;
+}
+
+sub stat {
+ my $self = shift;
+ my $data = "";
+ msgctl($$self,IPC_STAT,$data) or
+ return undef;
+ IPC::Msg::stat->new->unpack($data);
+}
+
+sub set {
+ my $self = shift;
+ my $ds;
+
+ if(@_ == 1) {
+ $ds = shift;
+ }
+ else {
+ croak 'Bad arg count' if @_ % 2;
+ my %arg = @_;
+ my $ds = $self->stat
+ or return undef;
+ my($key,$val);
+ $ds->$key($val)
+ while(($key,$val) = each %arg);
+ }
+
+ msgctl($$self,IPC_SET,$ds->pack);
+}
+
+sub remove {
+ my $self = shift;
+ (msgctl($$self,IPC_RMID,0), undef $$self)[0];
+}
+
+sub rcv {
+ @_ == 5 || croak '$msg->rcv( BUF, LEN, TYPE, FLAGS )';
+ my $self = shift;
+ my $buf = "";
+ msgrcv($$self,$buf,$_[1],$_[2] || 0, $_[3] || 0) or
+ return;
+ my $type;
+ ($type,$_[0]) = unpack("L a*",$buf);
+ $type;
+}
+
+sub snd {
+ @_ == 4 || croak '$msg->snd( TYPE, BUF, FLAGS )';
+ my $self = shift;
+ msgsnd($$self,pack("L a*",$_[0],$_[1]), $_[2] || 0);
+}
+
+
+1;
+
+__END__
+
+=head1 NAME
+
+IPC::Msg - SysV Msg IPC object class
+
+=head1 SYNOPSIS
+
+ 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;
+
+=head1 DESCRIPTION
+
+=head1 METHODS
+
+=over 4
+
+=item new ( KEY , FLAGS )
+
+Creates a new message queue associated with C<KEY>. A new queue is
+created if
+
+=over 4
+
+=item *
+
+C<KEY> is equal to C<IPC_PRIVATE>
+
+=item *
+
+C<KEY> does not already have a message queue
+associated with it, and C<I<FLAGS> & IPC_CREAT> is true.
+
+=back
+
+On creation of a new message queue C<FLAGS> is used to set the
+permissions.
+
+=item id
+
+Returns the system message queue identifier.
+
+=item rcv ( BUF, LEN [, TYPE [, FLAGS ]] )
+
+Read a message from the queue. Returns the type of the message read. See
+L<msgrcv>
+
+=item remove
+
+Remove and destroy the message queue from the system.
+
+=item set ( STAT )
+
+=item set ( NAME => VALUE [, NAME => VALUE ...] )
+
+C<set> will set the following values of the C<stat> structure associated
+with the message queue.
+
+ uid
+ gid
+ mode (oly the permission bits)
+ qbytes
+
+C<set> accepts either a stat object, as returned by the C<stat> method,
+or a list of I<name>-I<value> pairs.
+
+=item snd ( TYPE, MSG [, FLAGS ] )
+
+Place a message on the queue with the data from C<MSG> and with type C<TYPE>.
+See L<msgsnd>.
+
+=item stat
+
+Returns an object of type C<IPC::Msg::stat> which is a sub-class of
+C<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
+
+=back
+
+=head1 SEE ALSO
+
+L<IPC::SysV> L<Class::Struct>
+
+=head1 AUTHOR
+
+Graham Barr <gbarr@pobox.com>
+
+=head1 COPYRIGHT
+
+Copyright (c) 1997 Graham Barr. All rights reserved.
+This program is free software; you can redistribute it and/or modify it
+under the same terms as Perl itself.
+
+=cut
+