Deliantra-Client/DC/DB.pm

=head1 NAME

DC::DB - async. database and filesystem access for deliantra

=head1 SYNOPSIS

 use DC::DB;

=head1 DESCRIPTION

=over 4

=cut

package DC::DB;

use strict;
use utf8;

use File::Path ();
use Carp ();
use Storable ();
use Config;
use BDB;

use DC;

our $ODBDIR  = "cfplus-" . BDB::VERSION_MAJOR . "." . BDB::VERSION_MINOR . "-$Config{archname}";
our $DBDIR   = "client-" . BDB::VERSION_MAJOR . "." . BDB::VERSION_MINOR . "-$Config{archname}";
our $DB_HOME = "$Deliantra::VARDIR/$DBDIR";

unless (-d $DB_HOME) {
   if (-d "$Deliantra::VARDIR/$ODBDIR") {
      rename "$Deliantra::VARDIR/$ODBDIR", $DB_HOME;
      print STDERR "INFO: moved old database from $Deliantra::VARDIR/$ODBDIR to $DB_HOME\n";
   } elsif (-d "$Deliantra::OLDDIR/$ODBDIR") {
      rename "$Deliantra::OLDDIR/$DBDIR", $DB_HOME;
      print STDERR "INFO: moved old database from $Deliantra::OLDDIR/$ODBDIR to $DB_HOME\n";
   } else {
      File::Path::mkpath [$DB_HOME]
         or die "unable to create database directory $DB_HOME: $!";
   }
}

BDB::max_poll_time 0.03;
BDB::max_parallel 1;

our $DB_ENV;
our $DB_STATE;
our %DB_TABLE;
our $TILE_SEQ;

sub try_open_db {
   File::Path::mkpath [$DB_HOME];

   my $env = db_env_create;

   $env->set_errfile (\*STDERR);
   $env->set_msgfile (\*STDERR);
   $env->set_verbose (-1, 1);

   $env->set_flags (BDB::AUTO_COMMIT | BDB::REGION_INIT);
   $env->set_flags      (&BDB::LOG_AUTOREMOVE ) if BDB::VERSION v0, v4.7;
   $env->log_set_config (&BDB::LOG_AUTO_REMOVE) if BDB::VERSION v4.7;

   $env->set_timeout (3, BDB::SET_TXN_TIMEOUT);
   $env->set_timeout (3, BDB::SET_LOCK_TIMEOUT);

   $env->set_cachesize (0, 2048 * 1024, 0);

   db_env_open $env, $DB_HOME,
               BDB::CREATE | BDB::REGISTER | BDB::RECOVER | BDB::INIT_MPOOL | BDB::INIT_LOCK | BDB::INIT_TXN,
               0666;

   $! and die "cannot open database environment $DB_HOME: " . BDB::strerror;

   $DB_ENV = $env;

   1
}

sub table($) {
   $DB_TABLE{$_[0]} ||= do {
      my ($table) = @_;

      $table =~ s/([^a-zA-Z0-9_\-])/sprintf "=%x=", ord $1/ge;

      my $db = db_create $DB_ENV;
      $db->set_flags (BDB::CHKSUM);

      db_open $db, undef, $table, undef, BDB::BTREE,
              BDB::AUTO_COMMIT | BDB::CREATE | BDB::READ_UNCOMMITTED, 0666;

      $! and "unable to open/create database table $_[0]: ". BDB::strerror;

      $db
   }
}

#############################################################################

our $WATCHER;
our $SYNC;
our $facemap;

sub exists($$$) {
   my ($db, $key, $cb) = @_;

   my $data;
   db_get table $db, undef, $key, $data, 0, sub {
      $cb->($! ? () : length $data);
   };
}

sub get($$$) {
   my ($db, $key, $cb) = @_;

   my $data;
   db_get table $db, undef, $key, $data, 0, sub {
      $cb->($! ? () : $data);
   };
}

sub put($$$$) {
   my ($db, $key, $data, $cb) = @_;

   db_put table $db, undef, $key, $data, 0, sub {
      $cb->($!);
      $SYNC->again unless $SYNC->is_active;
   };
}

sub do_table {
   my ($db, $cb) = @_;

   $db = table $db;

   my $cursor = $db->cursor;
   my %kv;

   for (;;) {
      db_c_get $cursor, my $k, my $v, BDB::NEXT;
      last if $!;
      $kv{$k} = $v;
   }

   $cb->(\%kv);
}

sub do_get_tile_id {
   my ($name, $cb) = @_;

   my $table = table "facemap";
   my $id;

   db_get $table, undef, $name => $id, 0;
   $! or return $cb->($id);

   unless ($TILE_SEQ) {
      $TILE_SEQ = $table->sequence;
      $TILE_SEQ->initial_value (64);
      $TILE_SEQ->set_cachesize (0);
      db_sequence_open $TILE_SEQ, undef, "id", BDB::CREATE;
   }

   db_sequence_get $TILE_SEQ, undef, 1, my $id;

   die "unable to allocate tile id: $!"
      if $!;
   
   db_put $table, undef, $name => $id, 0;
   $cb->($id);

}

sub get_tile_id_sync($) {
   my ($name) = @_;

   $facemap->{$name} ||= do {
      my $id;
      do_get_tile_id $name, sub {
         $id = $_[0];
      };
      BDB::flush;
      $id
   }
}

#############################################################################

sub path_of_res($) {
   utf8::downgrade $_[0]; # bug in unpack "H*"
   "$DB_HOME/res-data-" . unpack "H*", $_[0]
}

sub sync {
   # for debugging
   #DC::DB::Server::req (sync => sub { });
   DC::DB::Server::sync ();
}

sub unlink($$) {
   DC::DB::Server::req (unlink => @_);
}

sub read_file($$) {
   DC::DB::Server::req (read_file => @_);
}

sub write_file($$$) {
   DC::DB::Server::req (write_file => @_);
}

sub prefetch_file($$$) {
   DC::DB::Server::req (prefetch_file => @_);
}

sub logprint($$$) {
   DC::DB::Server::req (logprint => @_);
}

#############################################################################

package DC::DB::Server;

use strict;

use EV ();
use Fcntl;

our %CB;
our $FH;
our $ID = "aaa0";
our ($fh_r_watcher, $fh_w_watcher);
our $sync_timer;
our $write_buf;
our $read_buf;

sub fh_write {
   my $len = syswrite $FH, $write_buf;

   substr $write_buf, 0, $len, "";

   $fh_w_watcher->stop
      unless length $write_buf;
}

sub fh_read {
   my $status = sysread $FH, $read_buf, 16384, length $read_buf;

   die "FATAL: database process died\n"
      if $status == 0 && defined $status;

   while () {
      return if 4 > length $read_buf;
      my $len = unpack "N", $read_buf;

      return if $len + 4 > length $read_buf;

      substr $read_buf, 0, 4, "";
      my $res = Storable::thaw substr $read_buf, 0, $len, "";

      my ($id, @args) = @$res;
      (delete $CB{$id})->(@args);
   }
}

sub sync {
   # biggest mess evarr
   my $fds; (vec $fds, fileno $FH, 1) =  1;

   while (1 < scalar keys %CB) {
      my $r = $fds;
      my $w = length $write_buf ? $fds : undef;
      select $r, $w, undef, undef;

      fh_write if vec $w, fileno $FH, 1;
      fh_read  if vec $r, fileno $FH, 1;
   }
}

sub req {
   my ($type, @args) = @_;
   my $cb = pop @args;

   my $id = ++$ID;
   $write_buf .= pack "N/a*", Storable::freeze [$id, $type, @args];
   $CB{$id} = $cb;

   $fh_w_watcher->start;
}

sub do_unlink {
   unlink $_[0];
}

sub do_read_file {
   my ($path) = @_;

   utf8::downgrade $path;
   open my $fh, "<:raw", $path
      or return;
   sysread $fh, my $buf, -s $fh;

   $buf
}

sub do_write_file {
   my ($path, $data) = @_;

   utf8::downgrade $path;
   utf8::downgrade $data;
   open my $fh, ">:raw", $path
      or return;
   syswrite $fh, $data;
   close $fh;

   1
}

sub do_prefetch_file {
   my ($path, $size) = @_;

   utf8::downgrade $path;
   open my $fh, "<:raw", $path
      or return;
   sysread $fh, my $buf, $size;

   1
}

our %LOG_FH;

sub do_logprint {
   my ($path, $line) = @_;

   $LOG_FH{$path} ||= do {
      open my $fh, ">>:utf8", $path
         or warn "Couldn't open logfile $path: $!";

      $fh->autoflush (1);

      $fh
   };

   my ($sec, $min, $hour, $mday, $mon, $year) = localtime time;

   my $ts = sprintf "%04d-%02d-%02d %02d:%02d:%02d",
               $year + 1900, $mon + 1, $mday, $hour, $min, $sec;

   print { $LOG_FH{$path} } "$ts $line\n"
}

sub run {
   ($FH, my $fh) = DC::socketpipe;

   my $oldfh = select $FH; $| = 1; select $oldfh;
   my $oldfh = select $fh; $| = 1; select $oldfh;

   my $pid = fork;
   
   if (defined $pid && !$pid) {
      local $SIG{QUIT} = "IGNORE";
      local $SIG{__DIE__};
      local $SIG{__WARN__};
      eval {
         close $FH;

         while () {
            4 == read $fh, my $len, 4
               or last;
            $len = unpack "N", $len;
            $len == read $fh, my $req, $len
               or die "unexpected eof while reading request";

            $req = Storable::thaw $req;

            my ($id, $type, @args) = @$req;
            my $cb = DC::DB::Server->can ("do_$type")
               or die "$type: unknown database request type\n";
            my $res = pack "N/a*", Storable::freeze [$id, $cb->(@args)];
            (syswrite $fh, $res) == length $res
               or die "DB::write: $!";
         }
      };

      my $error = $@;

      eval {
         Storable::store_fd [die => $error], $fh;
      };

      warn $error
         if $error;

      DC::_exit 0;
   }

   close $fh;
   DC::fh_nonblocking $FH, 1;

   $CB{die} = sub { die shift };

   $fh_r_watcher = EV::io $FH, EV::READ , \&fh_read;
   $fh_w_watcher = EV::io $FH, EV::WRITE, \&fh_write;
}

sub stop {
   close $FH;
}

package DC::DB;

sub nuke_db {
   File::Path::mkpath [$DB_HOME];
   eval { File::Path::rmtree $DB_HOME };
}

sub open_db {
   unless (eval { try_open_db }) {
      warn "$@";#d#
      eval { nuke_db };
      try_open_db;
   }

   # fetch the full face table first
   unless ($facemap) {
      do_table facemap => sub {
         $facemap = $_[0];
         delete $facemap->{id};
         my %maptile = reverse %$facemap;#d#
         if ((scalar keys %$facemap) != (scalar keys %maptile)) {#d#
            $facemap = { };#d#
            DC::error "FATAL: facemap is not a 1:1 mapping, please report this and delete your $DB_HOME directory!\n";#d#
         }#d#
      };
   }

   $WATCHER = EV::io BDB::poll_fileno, EV::READ, \&BDB::poll_cb;
   $SYNC = EV::timer_ns 0, 60, sub {
      $_[0]->stop;
      db_env_txn_checkpoint $DB_ENV, 0, 0, 0, sub { };
   };
}

END {
   db_env_txn_checkpoint $DB_ENV, 0, 0, 0
      if $DB_ENV;

   undef $TILE_SEQ;
   %DB_TABLE = ();
   undef $DB_ENV;
}

1;

=back

=head1 AUTHOR

 Marc Lehmann <schmorp@schmorp.de>
 http://home.schmorp.de/

=cut

Revision:	1.39
Committed:	Tue Sep 2 04:38:23 2008 UTC (15 years, 8 months ago) by root
Branch:	MAIN
CVS Tags:	rel-0_9976, rel-0_9977, rel-0_9978
Changes since 1.38:	+7 -1 lines
Log Message:	* empty log message *
#	Content
1	=head1 NAME
2
3	DC::DB - async. database and filesystem access for deliantra
4
5	=head1 SYNOPSIS
6
7	use DC::DB;
8
9	=head1 DESCRIPTION
10
11	=over 4
12
13	=cut
14
15	package DC::DB;
16
17	use strict;
18	use utf8;
19
20	use File::Path ();
21	use Carp ();
22	use Storable ();
23	use Config;
24	use BDB;
25
26	use DC;
27
28	our $ODBDIR = "cfplus-" . BDB::VERSION_MAJOR . "." . BDB::VERSION_MINOR . "-$Config{archname}";
29	our $DBDIR = "client-" . BDB::VERSION_MAJOR . "." . BDB::VERSION_MINOR . "-$Config{archname}";
30	our $DB_HOME = "$Deliantra::VARDIR/$DBDIR";
31
32	unless (-d $DB_HOME) {
33	if (-d "$Deliantra::VARDIR/$ODBDIR") {
34	rename "$Deliantra::VARDIR/$ODBDIR", $DB_HOME;
35	print STDERR "INFO: moved old database from $Deliantra::VARDIR/$ODBDIR to $DB_HOME\n";
36	} elsif (-d "$Deliantra::OLDDIR/$ODBDIR") {
37	rename "$Deliantra::OLDDIR/$DBDIR", $DB_HOME;
38	print STDERR "INFO: moved old database from $Deliantra::OLDDIR/$ODBDIR to $DB_HOME\n";
39	} else {
40	File::Path::mkpath [$DB_HOME]
41	or die "unable to create database directory $DB_HOME: $!";
42	}
43	}
44
45	BDB::max_poll_time 0.03;
46	BDB::max_parallel 1;
47
48	our $DB_ENV;
49	our $DB_STATE;
50	our %DB_TABLE;
51	our $TILE_SEQ;
52
53	sub try_open_db {
54	File::Path::mkpath [$DB_HOME];
55
56	my $env = db_env_create;
57
58	$env->set_errfile (\*STDERR);
59	$env->set_msgfile (\*STDERR);
60	$env->set_verbose (-1, 1);
61
62	$env->set_flags (BDB::AUTO_COMMIT \| BDB::REGION_INIT);
63	$env->set_flags (&BDB::LOG_AUTOREMOVE ) if BDB::VERSION v0, v4.7;
64	$env->log_set_config (&BDB::LOG_AUTO_REMOVE) if BDB::VERSION v4.7;
65
66	$env->set_timeout (3, BDB::SET_TXN_TIMEOUT);
67	$env->set_timeout (3, BDB::SET_LOCK_TIMEOUT);
68
69	$env->set_cachesize (0, 2048 * 1024, 0);
70
71	db_env_open $env, $DB_HOME,
72	BDB::CREATE \| BDB::REGISTER \| BDB::RECOVER \| BDB::INIT_MPOOL \| BDB::INIT_LOCK \| BDB::INIT_TXN,
73	0666;
74
75	$! and die "cannot open database environment $DB_HOME: " . BDB::strerror;
76
77	$DB_ENV = $env;
78
79	1
80	}
81
82	sub table($) {
83	$DB_TABLE{$_[0]} \|\|= do {
84	my ($table) = @_;
85
86	$table =~ s/([^a-zA-Z0-9_\-])/sprintf "=%x=", ord $1/ge;
87
88	my $db = db_create $DB_ENV;
89	$db->set_flags (BDB::CHKSUM);
90
91	db_open $db, undef, $table, undef, BDB::BTREE,
92	BDB::AUTO_COMMIT \| BDB::CREATE \| BDB::READ_UNCOMMITTED, 0666;
93
94	$! and "unable to open/create database table $_[0]: ". BDB::strerror;
95
96	$db
97	}
98	}
99
100	#############################################################################
101
102	our $WATCHER;
103	our $SYNC;
104	our $facemap;
105
106	sub exists($$$) {
107	my ($db, $key, $cb) = @_;
108
109	my $data;
110	db_get table $db, undef, $key, $data, 0, sub {
111	$cb->($! ? () : length $data);
112	};
113	}
114
115	sub get($$$) {
116	my ($db, $key, $cb) = @_;
117
118	my $data;
119	db_get table $db, undef, $key, $data, 0, sub {
120	$cb->($! ? () : $data);
121	};
122	}
123
124	sub put($$$$) {
125	my ($db, $key, $data, $cb) = @_;
126
127	db_put table $db, undef, $key, $data, 0, sub {
128	$cb->($!);
129	$SYNC->again unless $SYNC->is_active;
130	};
131	}
132
133	sub do_table {
134	my ($db, $cb) = @_;
135
136	$db = table $db;
137
138	my $cursor = $db->cursor;
139	my %kv;
140
141	for (;;) {
142	db_c_get $cursor, my $k, my $v, BDB::NEXT;
143	last if $!;
144	$kv{$k} = $v;
145	}
146
147	$cb->(\%kv);
148	}
149
150	sub do_get_tile_id {
151	my ($name, $cb) = @_;
152
153	my $table = table "facemap";
154	my $id;
155
156	db_get $table, undef, $name => $id, 0;
157	$! or return $cb->($id);
158
159	unless ($TILE_SEQ) {
160	$TILE_SEQ = $table->sequence;
161	$TILE_SEQ->initial_value (64);
162	$TILE_SEQ->set_cachesize (0);
163	db_sequence_open $TILE_SEQ, undef, "id", BDB::CREATE;
164	}
165
166	db_sequence_get $TILE_SEQ, undef, 1, my $id;
167
168	die "unable to allocate tile id: $!"
169	if $!;
170
171	db_put $table, undef, $name => $id, 0;
172	$cb->($id);
173
174	}
175
176	sub get_tile_id_sync($) {
177	my ($name) = @_;
178
179	$facemap->{$name} \|\|= do {
180	my $id;
181	do_get_tile_id $name, sub {
182	$id = $_[0];
183	};
184	BDB::flush;
185	$id
186	}
187	}
188
189	#############################################################################
190
191	sub path_of_res($) {
192	utf8::downgrade $_[0]; # bug in unpack "H*"
193	"$DB_HOME/res-data-" . unpack "H*", $_[0]
194	}
195
196	sub sync {
197	# for debugging
198	#DC::DB::Server::req (sync => sub { });
199	DC::DB::Server::sync ();
200	}
201
202	sub unlink($$) {
203	DC::DB::Server::req (unlink => @_);
204	}
205
206	sub read_file($$) {
207	DC::DB::Server::req (read_file => @_);
208	}
209
210	sub write_file($$$) {
211	DC::DB::Server::req (write_file => @_);
212	}
213
214	sub prefetch_file($$$) {
215	DC::DB::Server::req (prefetch_file => @_);
216	}
217
218	sub logprint($$$) {
219	DC::DB::Server::req (logprint => @_);
220	}
221
222	#############################################################################
223
224	package DC::DB::Server;
225
226	use strict;
227
228	use EV ();
229	use Fcntl;
230
231	our %CB;
232	our $FH;
233	our $ID = "aaa0";
234	our ($fh_r_watcher, $fh_w_watcher);
235	our $sync_timer;
236	our $write_buf;
237	our $read_buf;
238
239	sub fh_write {
240	my $len = syswrite $FH, $write_buf;
241
242	substr $write_buf, 0, $len, "";
243
244	$fh_w_watcher->stop
245	unless length $write_buf;
246	}
247
248	sub fh_read {
249	my $status = sysread $FH, $read_buf, 16384, length $read_buf;
250
251	die "FATAL: database process died\n"
252	if $status == 0 && defined $status;
253
254	while () {
255	return if 4 > length $read_buf;
256	my $len = unpack "N", $read_buf;
257
258	return if $len + 4 > length $read_buf;
259
260	substr $read_buf, 0, 4, "";
261	my $res = Storable::thaw substr $read_buf, 0, $len, "";
262
263	my ($id, @args) = @$res;
264	(delete $CB{$id})->(@args);
265	}
266	}
267
268	sub sync {
269	# biggest mess evarr
270	my $fds; (vec $fds, fileno $FH, 1) = 1;
271
272	while (1 < scalar keys %CB) {
273	my $r = $fds;
274	my $w = length $write_buf ? $fds : undef;
275	select $r, $w, undef, undef;
276
277	fh_write if vec $w, fileno $FH, 1;
278	fh_read if vec $r, fileno $FH, 1;
279	}
280	}
281
282	sub req {
283	my ($type, @args) = @_;
284	my $cb = pop @args;
285
286	my $id = ++$ID;
287	$write_buf .= pack "N/a*", Storable::freeze [$id, $type, @args];
288	$CB{$id} = $cb;
289
290	$fh_w_watcher->start;
291	}
292
293	sub do_unlink {
294	unlink $_[0];
295	}
296
297	sub do_read_file {
298	my ($path) = @_;
299
300	utf8::downgrade $path;
301	open my $fh, "<:raw", $path
302	or return;
303	sysread $fh, my $buf, -s $fh;
304
305	$buf
306	}
307
308	sub do_write_file {
309	my ($path, $data) = @_;
310
311	utf8::downgrade $path;
312	utf8::downgrade $data;
313	open my $fh, ">:raw", $path
314	or return;
315	syswrite $fh, $data;
316	close $fh;
317
318	1
319	}
320
321	sub do_prefetch_file {
322	my ($path, $size) = @_;
323
324	utf8::downgrade $path;
325	open my $fh, "<:raw", $path
326	or return;
327	sysread $fh, my $buf, $size;
328
329	1
330	}
331
332	our %LOG_FH;
333
334	sub do_logprint {
335	my ($path, $line) = @_;
336
337	$LOG_FH{$path} \|\|= do {
338	open my $fh, ">>:utf8", $path
339	or warn "Couldn't open logfile $path: $!";
340
341	$fh->autoflush (1);
342
343	$fh
344	};
345
346	my ($sec, $min, $hour, $mday, $mon, $year) = localtime time;
347
348	my $ts = sprintf "%04d-%02d-%02d %02d:%02d:%02d",
349	$year + 1900, $mon + 1, $mday, $hour, $min, $sec;
350
351	print { $LOG_FH{$path} } "$ts $line\n"
352	}
353
354	sub run {
355	($FH, my $fh) = DC::socketpipe;
356
357	my $oldfh = select $FH; $\| = 1; select $oldfh;
358	my $oldfh = select $fh; $\| = 1; select $oldfh;
359
360	my $pid = fork;
361
362	if (defined $pid && !$pid) {
363	local $SIG{QUIT} = "IGNORE";
364	local $SIG{__DIE__};
365	local $SIG{__WARN__};
366	eval {
367	close $FH;
368
369	while () {
370	4 == read $fh, my $len, 4
371	or last;
372	$len = unpack "N", $len;
373	$len == read $fh, my $req, $len
374	or die "unexpected eof while reading request";
375
376	$req = Storable::thaw $req;
377
378	my ($id, $type, @args) = @$req;
379	my $cb = DC::DB::Server->can ("do_$type")
380	or die "$type: unknown database request type\n";
381	my $res = pack "N/a*", Storable::freeze [$id, $cb->(@args)];
382	(syswrite $fh, $res) == length $res
383	or die "DB::write: $!";
384	}
385	};
386
387	my $error = $@;
388
389	eval {
390	Storable::store_fd [die => $error], $fh;
391	};
392
393	warn $error
394	if $error;
395
396	DC::_exit 0;
397	}
398
399	close $fh;
400	DC::fh_nonblocking $FH, 1;
401
402	$CB{die} = sub { die shift };
403
404	$fh_r_watcher = EV::io $FH, EV::READ , \&fh_read;
405	$fh_w_watcher = EV::io $FH, EV::WRITE, \&fh_write;
406	}
407
408	sub stop {
409	close $FH;
410	}
411
412	package DC::DB;
413
414	sub nuke_db {
415	File::Path::mkpath [$DB_HOME];
416	eval { File::Path::rmtree $DB_HOME };
417	}
418
419	sub open_db {
420	unless (eval { try_open_db }) {
421	warn "$@";#d#
422	eval { nuke_db };
423	try_open_db;
424	}
425
426	# fetch the full face table first
427	unless ($facemap) {
428	do_table facemap => sub {
429	$facemap = $_[0];
430	delete $facemap->{id};
431	my %maptile = reverse %$facemap;#d#
432	if ((scalar keys %$facemap) != (scalar keys %maptile)) {#d#
433	$facemap = { };#d#
434	DC::error "FATAL: facemap is not a 1:1 mapping, please report this and delete your $DB_HOME directory!\n";#d#
435	}#d#
436	};
437	}
438
439	$WATCHER = EV::io BDB::poll_fileno, EV::READ, \&BDB::poll_cb;
440	$SYNC = EV::timer_ns 0, 60, sub {
441	$_[0]->stop;
442	db_env_txn_checkpoint $DB_ENV, 0, 0, 0, sub { };
443	};
444	}
445
446	END {
447	db_env_txn_checkpoint $DB_ENV, 0, 0, 0
448	if $DB_ENV;
449
450	undef $TILE_SEQ;
451	%DB_TABLE = ();
452	undef $DB_ENV;
453	}
454
455	1;
456
457	=back
458
459	=head1 AUTHOR
460
461	Marc Lehmann <schmorp@schmorp.de>
462	http://home.schmorp.de/
463
464	=cut
465