[ViewVC] Diff of: cvs/AnyEvent/lib/AnyEvent/Handle.pm

Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents):
Revision 1.41 by root, Tue May 27 05:47:36 2008 UTC vs.
Revision 1.80 by root, Sun Jul 27 08:43:32 2008 UTC

…		…
1	package AnyEvent::Handle;	1	package AnyEvent::Handle;
2		2
3	no warnings;	3	no warnings;
4	use strict;	4	use strict qw(subs vars);
5		5
6	use AnyEvent ();	6	use AnyEvent ();
7	use AnyEvent::Util qw(WSAWOULDBLOCK);	7	use AnyEvent::Util qw(WSAEWOULDBLOCK);
8	use Scalar::Util ();	8	use Scalar::Util ();
9	use Carp ();	9	use Carp ();
10	use Fcntl ();	10	use Fcntl ();
11	use Errno qw/EAGAIN EINTR/;	11	use Errno qw(EAGAIN EINTR);
12		12
13	=head1 NAME	13	=head1 NAME
14		14
15	AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent	15	AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent
16		16
17	=cut	17	=cut
18		18
19	our $VERSION = '0.04';	19	our $VERSION = 4.22;
20		20
21	=head1 SYNOPSIS	21	=head1 SYNOPSIS
22		22
23	use AnyEvent;	23	use AnyEvent;
24	use AnyEvent::Handle;	24	use AnyEvent::Handle;
75	NOTE: The filehandle will be set to non-blocking (using	75	NOTE: The filehandle will be set to non-blocking (using
76	AnyEvent::Util::fh_nonblocking).	76	AnyEvent::Util::fh_nonblocking).
77		77
78	=item on_eof => $cb->($handle)	78	=item on_eof => $cb->($handle)
79		79
80	Set the callback to be called on EOF.	80	Set the callback to be called when an end-of-file condition is detected,
		81	i.e. in the case of a socket, when the other side has closed the
		82	connection cleanly.
81		83
82	While not mandatory, it is highly recommended to set an eof callback,	84	While not mandatory, it is I<highly> recommended to set an eof callback,
83	otherwise you might end up with a closed socket while you are still	85	otherwise you might end up with a closed socket while you are still
84	waiting for data.	86	waiting for data.
85		87
		88	If an EOF condition has been detected but no C<on_eof> callback has been
		89	set, then a fatal error will be raised with C<$!> set to <0>.
		90
86	=item on_error => $cb->($handle)	91	=item on_error => $cb->($handle, $fatal)
87		92
88	This is the fatal error callback, that is called when, well, a fatal error	93	This is the error callback, which is called when, well, some error
89	occurs, such as not being able to resolve the hostname, failure to connect	94	occured, such as not being able to resolve the hostname, failure to
90	or a read error.	95	connect or a read error.
91		96
92	The object will not be in a usable state when this callback has been	97	Some errors are fatal (which is indicated by C<$fatal> being true). On
93	called.	98	fatal errors the handle object will be shut down and will not be
		99	usable. Non-fatal errors can be retried by simply returning, but it is
		100	recommended to simply ignore this parameter and instead abondon the handle
		101	object when this callback is invoked.
94		102
95	On callback entrance, the value of C<$!> contains the operating system	103	On callback entrance, the value of C<$!> contains the operating system
96	error (or C<ENOSPC>, C<EPIPE> or C<EBADMSG>).	104	error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>).
97
98	The callback should throw an exception. If it returns, then
99	AnyEvent::Handle will C<croak> for you.
100		105
101	While not mandatory, it is I<highly> recommended to set this callback, as	106	While not mandatory, it is I<highly> recommended to set this callback, as
102	you will not be notified of errors otherwise. The default simply calls	107	you will not be notified of errors otherwise. The default simply calls
103	die.	108	C<croak>.
104		109
105	=item on_read => $cb->($handle)	110	=item on_read => $cb->($handle)
106		111
107	This sets the default read callback, which is called when data arrives	112	This sets the default read callback, which is called when data arrives
108	and no read request is in the queue.	113	and no read request is in the queue (unlike read queue callbacks, this
		114	callback will only be called when at least one octet of data is in the
		115	read buffer).
109		116
110	To access (and remove data from) the read buffer, use the C<< ->rbuf >>	117	To access (and remove data from) the read buffer, use the C<< ->rbuf >>
111	method or access the C<$handle->{rbuf}> member directly.	118	method or access the C<$handle->{rbuf}> member directly.
112		119
113	When an EOF condition is detected then AnyEvent::Handle will first try to	120	When an EOF condition is detected then AnyEvent::Handle will first try to
…		…
119		126
120	This sets the callback that is called when the write buffer becomes empty	127	This sets the callback that is called when the write buffer becomes empty
121	(or when the callback is set and the buffer is empty already).	128	(or when the callback is set and the buffer is empty already).
122		129
123	To append to the write buffer, use the C<< ->push_write >> method.	130	To append to the write buffer, use the C<< ->push_write >> method.
		131
		132	This callback is useful when you don't want to put all of your write data
		133	into the queue at once, for example, when you want to write the contents
		134	of some file to the socket you might not want to read the whole file into
		135	memory and push it into the queue, but instead only read more data from
		136	the file when the write queue becomes empty.
		137
		138	=item timeout => $fractional_seconds
		139
		140	If non-zero, then this enables an "inactivity" timeout: whenever this many
		141	seconds pass without a successful read or write on the underlying file
		142	handle, the C<on_timeout> callback will be invoked (and if that one is
		143	missing, an C<ETIMEDOUT> error will be raised).
		144
		145	Note that timeout processing is also active when you currently do not have
		146	any outstanding read or write requests: If you plan to keep the connection
		147	idle then you should disable the timout temporarily or ignore the timeout
		148	in the C<on_timeout> callback.
		149
		150	Zero (the default) disables this timeout.
		151
		152	=item on_timeout => $cb->($handle)
		153
		154	Called whenever the inactivity timeout passes. If you return from this
		155	callback, then the timeout will be reset as if some activity had happened,
		156	so this condition is not fatal in any way.
124		157
125	=item rbuf_max => <bytes>	158	=item rbuf_max => <bytes>
126		159
127	If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>)	160	If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>)
128	when the read buffer ever (strictly) exceeds this size. This is useful to	161	when the read buffer ever (strictly) exceeds this size. This is useful to
…		…
132	be configured to accept only so-and-so much data that it cannot act on	165	be configured to accept only so-and-so much data that it cannot act on
133	(for example, when expecting a line, an attacker could send an unlimited	166	(for example, when expecting a line, an attacker could send an unlimited
134	amount of data without a callback ever being called as long as the line	167	amount of data without a callback ever being called as long as the line
135	isn't finished).	168	isn't finished).
136		169
		170	=item autocork => <boolean>
		171
		172	When disabled (the default), then C<push_write> will try to immediately
		173	write the data to the handle if possible. This avoids having to register
		174	a write watcher and wait for the next event loop iteration, but can be
		175	inefficient if you write multiple small chunks (this disadvantage is
		176	usually avoided by your kernel's nagle algorithm, see C<low_delay>).
		177
		178	When enabled, then writes will always be queued till the next event loop
		179	iteration. This is efficient when you do many small writes per iteration,
		180	but less efficient when you do a single write only.
		181
		182	=item no_delay => <boolean>
		183
		184	When doing small writes on sockets, your operating system kernel might
		185	wait a bit for more data before actually sending it out. This is called
		186	the Nagle algorithm, and usually it is beneficial.
		187
		188	In some situations you want as low a delay as possible, which cna be
		189	accomplishd by setting this option to true.
		190
		191	The default is your opertaing system's default behaviour, this option
		192	explicitly enables or disables it, if possible.
		193
137	=item read_size => <bytes>	194	=item read_size => <bytes>
138		195
139	The default read block size (the amount of bytes this module will try to read	196	The default read block size (the amount of bytes this module will try to read
140	on each [loop iteration). Default: C<4096>.	197	during each (loop iteration). Default: C<8192>.
141		198
142	=item low_water_mark => <bytes>	199	=item low_water_mark => <bytes>
143		200
144	Sets the amount of bytes (default: C<0>) that make up an "empty" write	201	Sets the amount of bytes (default: C<0>) that make up an "empty" write
145	buffer: If the write reaches this size or gets even samller it is	202	buffer: If the write reaches this size or gets even samller it is
146	considered empty.	203	considered empty.
		204
		205	=item linger => <seconds>
		206
		207	If non-zero (default: C<3600>), then the destructor of the
		208	AnyEvent::Handle object will check wether there is still outstanding write
		209	data and will install a watcher that will write out this data. No errors
		210	will be reported (this mostly matches how the operating system treats
		211	outstanding data at socket close time).
		212
		213	This will not work for partial TLS data that could not yet been
		214	encoded. This data will be lost.
147		215
148	=item tls => "accept" \| "connect" \| Net::SSLeay::SSL object	216	=item tls => "accept" \| "connect" \| Net::SSLeay::SSL object
149		217
150	When this parameter is given, it enables TLS (SSL) mode, that means it	218	When this parameter is given, it enables TLS (SSL) mode, that means it
151	will start making tls handshake and will transparently encrypt/decrypt	219	will start making tls handshake and will transparently encrypt/decrypt
…		…
160	You can also provide your own TLS connection object, but you have	228	You can also provide your own TLS connection object, but you have
161	to make sure that you call either C<Net::SSLeay::set_connect_state>	229	to make sure that you call either C<Net::SSLeay::set_connect_state>
162	or C<Net::SSLeay::set_accept_state> on it before you pass it to	230	or C<Net::SSLeay::set_accept_state> on it before you pass it to
163	AnyEvent::Handle.	231	AnyEvent::Handle.
164		232
165	See the C<starttls> method if you need to start TLs negotiation later.	233	See the C<starttls> method if you need to start TLS negotiation later.
166		234
167	=item tls_ctx => $ssl_ctx	235	=item tls_ctx => $ssl_ctx
168		236
169	Use the given Net::SSLeay::CTX object to create the new TLS connection	237	Use the given Net::SSLeay::CTX object to create the new TLS connection
170	(unless a connection object was specified directly). If this parameter is	238	(unless a connection object was specified directly). If this parameter is
…		…
202	if ($self->{tls}) {	270	if ($self->{tls}) {
203	require Net::SSLeay;	271	require Net::SSLeay;
204	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx});	272	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx});
205	}	273	}
206		274
207	$self->on_eof (delete $self->{on_eof} ) if $self->{on_eof};	275	$self->{_activity} = AnyEvent->now;
208	$self->on_error (delete $self->{on_error}) if $self->{on_error};	276	$self->_timeout;
		277
209	$self->on_drain (delete $self->{on_drain}) if $self->{on_drain};	278	$self->on_drain (delete $self->{on_drain}) if exists $self->{on_drain};
210	$self->on_read (delete $self->{on_read} ) if $self->{on_read};	279	$self->no_delay (delete $self->{no_delay}) if exists $self->{no_delay};
211		280
212	$self->start_read;	281	$self->start_read
		282	if $self->{on_read};
213		283
214	$self	284	$self
215	}	285	}
216		286
217	sub _shutdown {	287	sub _shutdown {
218	my ($self) = @_;	288	my ($self) = @_;
219		289
		290	delete $self->{_tw};
220	delete $self->{_rw};	291	delete $self->{_rw};
221	delete $self->{_ww};	292	delete $self->{_ww};
222	delete $self->{fh};	293	delete $self->{fh};
223	}
224		294
		295	$self->stoptls;
		296	}
		297
225	sub error {	298	sub _error {
226	my ($self) = @_;	299	my ($self, $errno, $fatal) = @_;
227		300
228	{
229	local $!;
230	$self->_shutdown;	301	$self->_shutdown
231	}	302	if $fatal;
232		303
233	$self->{on_error}($self)	304	$! = $errno;
		305
234	if $self->{on_error};	306	if ($self->{on_error}) {
235		307	$self->{on_error}($self, $fatal);
		308	} else {
236	Carp::croak "AnyEvent::Handle uncaught fatal error: $!";	309	Carp::croak "AnyEvent::Handle uncaught error: $!";
		310	}
237	}	311	}
238		312
239	=item $fh = $handle->fh	313	=item $fh = $handle->fh
240		314
241	This method returns the file handle of the L<AnyEvent::Handle> object.	315	This method returns the file handle of the L<AnyEvent::Handle> object.
…		…
260		334
261	=cut	335	=cut
262		336
263	sub on_eof {	337	sub on_eof {
264	$_[0]{on_eof} = $_[1];	338	$_[0]{on_eof} = $_[1];
		339	}
		340
		341	=item $handle->on_timeout ($cb)
		342
		343	Replace the current C<on_timeout> callback, or disables the callback
		344	(but not the timeout) if C<$cb> = C<undef>. See C<timeout> constructor
		345	argument.
		346
		347	=cut
		348
		349	sub on_timeout {
		350	$_[0]{on_timeout} = $_[1];
		351	}
		352
		353	=item $handle->autocork ($boolean)
		354
		355	Enables or disables the current autocork behaviour (see C<autocork>
		356	constructor argument).
		357
		358	=cut
		359
		360	=item $handle->no_delay ($boolean)
		361
		362	Enables or disables the C<no_delay> setting (see constructor argument of
		363	the same name for details).
		364
		365	=cut
		366
		367	sub no_delay {
		368	$_[0]{no_delay} = $_[1];
		369
		370	eval {
		371	local $SIG{__DIE__};
		372	setsockopt $_[0]{fh}, &Socket::IPPROTO_TCP, &Socket::TCP_NODELAY, int $_[1];
		373	};
		374	}
		375
		376	#############################################################################
		377
		378	=item $handle->timeout ($seconds)
		379
		380	Configures (or disables) the inactivity timeout.
		381
		382	=cut
		383
		384	sub timeout {
		385	my ($self, $timeout) = @_;
		386
		387	$self->{timeout} = $timeout;
		388	$self->_timeout;
		389	}
		390
		391	# reset the timeout watcher, as neccessary
		392	# also check for time-outs
		393	sub _timeout {
		394	my ($self) = @_;
		395
		396	if ($self->{timeout}) {
		397	my $NOW = AnyEvent->now;
		398
		399	# when would the timeout trigger?
		400	my $after = $self->{_activity} + $self->{timeout} - $NOW;
		401
		402	# now or in the past already?
		403	if ($after <= 0) {
		404	$self->{_activity} = $NOW;
		405
		406	if ($self->{on_timeout}) {
		407	$self->{on_timeout}($self);
		408	} else {
		409	$self->_error (&Errno::ETIMEDOUT);
		410	}
		411
		412	# callback could have changed timeout value, optimise
		413	return unless $self->{timeout};
		414
		415	# calculate new after
		416	$after = $self->{timeout};
		417	}
		418
		419	Scalar::Util::weaken $self;
		420	return unless $self; # ->error could have destroyed $self
		421
		422	$self->{_tw} \|\|= AnyEvent->timer (after => $after, cb => sub {
		423	delete $self->{_tw};
		424	$self->_timeout;
		425	});
		426	} else {
		427	delete $self->{_tw};
		428	}
265	}	429	}
266		430
267	#############################################################################	431	#############################################################################
268		432
269	=back	433	=back
…		…
316	my $len = syswrite $self->{fh}, $self->{wbuf};	480	my $len = syswrite $self->{fh}, $self->{wbuf};
317		481
318	if ($len >= 0) {	482	if ($len >= 0) {
319	substr $self->{wbuf}, 0, $len, "";	483	substr $self->{wbuf}, 0, $len, "";
320		484
		485	$self->{_activity} = AnyEvent->now;
		486
321	$self->{on_drain}($self)	487	$self->{on_drain}($self)
322	if $self->{low_water_mark} >= length $self->{wbuf}	488	if $self->{low_water_mark} >= length $self->{wbuf}
323	&& $self->{on_drain};	489	&& $self->{on_drain};
324		490
325	delete $self->{_ww} unless length $self->{wbuf};	491	delete $self->{_ww} unless length $self->{wbuf};
326	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAWOULDBLOCK) {	492	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
327	$self->error;	493	$self->_error ($!, 1);
328	}	494	}
329	};	495	};
330		496
331	# try to write data immediately	497	# try to write data immediately
332	$cb->();	498	$cb->() unless $self->{autocork};
333		499
334	# if still data left in wbuf, we need to poll	500	# if still data left in wbuf, we need to poll
335	$self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb)	501	$self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb)
336	if length $self->{wbuf};	502	if length $self->{wbuf};
337	};	503	};
…		…
352	@_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write")	518	@_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write")
353	->($self, @_);	519	->($self, @_);
354	}	520	}
355		521
356	if ($self->{filter_w}) {	522	if ($self->{filter_w}) {
357	$self->{filter_w}->($self, \$_[0]);	523	$self->{filter_w}($self, \$_[0]);
358	} else {	524	} else {
359	$self->{wbuf} .= $_[0];	525	$self->{wbuf} .= $_[0];
360	$self->_drain_wbuf;	526	$self->_drain_wbuf;
361	}	527	}
362	}	528	}
363		529
364	=item $handle->push_write (type => @args)	530	=item $handle->push_write (type => @args)
365		531
366	=item $handle->unshift_write (type => @args)
367
368	Instead of formatting your data yourself, you can also let this module do	532	Instead of formatting your data yourself, you can also let this module do
369	the job by specifying a type and type-specific arguments.	533	the job by specifying a type and type-specific arguments.
370		534
371	Predefined types are (if you have ideas for additional types, feel free to	535	Predefined types are (if you have ideas for additional types, feel free to
372	drop by and tell us):	536	drop by and tell us):
…		…
376	=item netstring => $string	540	=item netstring => $string
377		541
378	Formats the given value as netstring	542	Formats the given value as netstring
379	(http://cr.yp.to/proto/netstrings.txt, this is not a recommendation to use them).	543	(http://cr.yp.to/proto/netstrings.txt, this is not a recommendation to use them).
380		544
381	=back
382
383	=cut	545	=cut
384		546
385	register_write_type netstring => sub {	547	register_write_type netstring => sub {
386	my ($self, $string) = @_;	548	my ($self, $string) = @_;
387		549
388	sprintf "%d:%s,", (length $string), $string	550	sprintf "%d:%s,", (length $string), $string
		551	};
		552
		553	=item packstring => $format, $data
		554
		555	An octet string prefixed with an encoded length. The encoding C<$format>
		556	uses the same format as a Perl C<pack> format, but must specify a single
		557	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an
		558	optional C<!>, C<< < >> or C<< > >> modifier).
		559
		560	=cut
		561
		562	register_write_type packstring => sub {
		563	my ($self, $format, $string) = @_;
		564
		565	pack "$format/a*", $string
389	};	566	};
390		567
391	=item json => $array_or_hashref	568	=item json => $array_or_hashref
392		569
393	Encodes the given hash or array reference into a JSON object. Unless you	570	Encodes the given hash or array reference into a JSON object. Unless you
…		…
427		604
428	$self->{json} ? $self->{json}->encode ($ref)	605	$self->{json} ? $self->{json}->encode ($ref)
429	: JSON::encode_json ($ref)	606	: JSON::encode_json ($ref)
430	};	607	};
431		608
		609	=item storable => $reference
		610
		611	Freezes the given reference using L<Storable> and writes it to the
		612	handle. Uses the C<nfreeze> format.
		613
		614	=cut
		615
		616	register_write_type storable => sub {
		617	my ($self, $ref) = @_;
		618
		619	require Storable;
		620
		621	pack "w/a*", Storable::nfreeze ($ref)
		622	};
		623
		624	=back
		625
432	=item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args)	626	=item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args)
433		627
434	This function (not method) lets you add your own types to C<push_write>.	628	This function (not method) lets you add your own types to C<push_write>.
435	Whenever the given C<type> is used, C<push_write> will invoke the code	629	Whenever the given C<type> is used, C<push_write> will invoke the code
436	reference with the handle object and the remaining arguments.	630	reference with the handle object and the remaining arguments.
…		…
456	ways, the "simple" way, using only C<on_read> and the "complex" way, using	650	ways, the "simple" way, using only C<on_read> and the "complex" way, using
457	a queue.	651	a queue.
458		652
459	In the simple case, you just install an C<on_read> callback and whenever	653	In the simple case, you just install an C<on_read> callback and whenever
460	new data arrives, it will be called. You can then remove some data (if	654	new data arrives, it will be called. You can then remove some data (if
461	enough is there) from the read buffer (C<< $handle->rbuf >>) if you want	655	enough is there) from the read buffer (C<< $handle->rbuf >>). Or you cna
462	or not.	656	leave the data there if you want to accumulate more (e.g. when only a
		657	partial message has been received so far).
463		658
464	In the more complex case, you want to queue multiple callbacks. In this	659	In the more complex case, you want to queue multiple callbacks. In this
465	case, AnyEvent::Handle will call the first queued callback each time new	660	case, AnyEvent::Handle will call the first queued callback each time new
466	data arrives and removes it when it has done its job (see C<push_read>,	661	data arrives (also the first time it is queued) and removes it when it has
467	below).	662	done its job (see C<push_read>, below).
468		663
469	This way you can, for example, push three line-reads, followed by reading	664	This way you can, for example, push three line-reads, followed by reading
470	a chunk of data, and AnyEvent::Handle will execute them in order.	665	a chunk of data, and AnyEvent::Handle will execute them in order.
471		666
472	Example 1: EPP protocol parser. EPP sends 4 byte length info, followed by	667	Example 1: EPP protocol parser. EPP sends 4 byte length info, followed by
473	the specified number of bytes which give an XML datagram.	668	the specified number of bytes which give an XML datagram.
474		669
475	# in the default state, expect some header bytes	670	# in the default state, expect some header bytes
476	$handle->on_read (sub {	671	$handle->on_read (sub {
477	# some data is here, now queue the length-header-read (4 octets)	672	# some data is here, now queue the length-header-read (4 octets)
478	shift->unshift_read_chunk (4, sub {	673	shift->unshift_read (chunk => 4, sub {
479	# header arrived, decode	674	# header arrived, decode
480	my $len = unpack "N", $_[1];	675	my $len = unpack "N", $_[1];
481		676
482	# now read the payload	677	# now read the payload
483	shift->unshift_read_chunk ($len, sub {	678	shift->unshift_read (chunk => $len, sub {
484	my $xml = $_[1];	679	my $xml = $_[1];
485	# handle xml	680	# handle xml
486	});	681	});
487	});	682	});
488	});	683	});
489		684
490	Example 2: Implement a client for a protocol that replies either with	685	Example 2: Implement a client for a protocol that replies either with "OK"
491	"OK" and another line or "ERROR" for one request, and 64 bytes for the	686	and another line or "ERROR" for the first request that is sent, and 64
492	second request. Due tot he availability of a full queue, we can just	687	bytes for the second request. Due to the availability of a queue, we can
493	pipeline sending both requests and manipulate the queue as necessary in	688	just pipeline sending both requests and manipulate the queue as necessary
494	the callbacks:	689	in the callbacks.
495		690
496	# request one	691	When the first callback is called and sees an "OK" response, it will
		692	C<unshift> another line-read. This line-read will be queued I<before> the
		693	64-byte chunk callback.
		694
		695	# request one, returns either "OK + extra line" or "ERROR"
497	$handle->push_write ("request 1\015\012");	696	$handle->push_write ("request 1\015\012");
498		697
499	# we expect "ERROR" or "OK" as response, so push a line read	698	# we expect "ERROR" or "OK" as response, so push a line read
500	$handle->push_read_line (sub {	699	$handle->push_read (line => sub {
501	# if we got an "OK", we have to _prepend_ another line,	700	# if we got an "OK", we have to _prepend_ another line,
502	# so it will be read before the second request reads its 64 bytes	701	# so it will be read before the second request reads its 64 bytes
503	# which are already in the queue when this callback is called	702	# which are already in the queue when this callback is called
504	# we don't do this in case we got an error	703	# we don't do this in case we got an error
505	if ($_[1] eq "OK") {	704	if ($_[1] eq "OK") {
506	$_[0]->unshift_read_line (sub {	705	$_[0]->unshift_read (line => sub {
507	my $response = $_[1];	706	my $response = $_[1];
508	...	707	...
509	});	708	});
510	}	709	}
511	});	710	});
512		711
513	# request two	712	# request two, simply returns 64 octets
514	$handle->push_write ("request 2\015\012");	713	$handle->push_write ("request 2\015\012");
515		714
516	# simply read 64 bytes, always	715	# simply read 64 bytes, always
517	$handle->push_read_chunk (64, sub {	716	$handle->push_read (chunk => 64, sub {
518	my $response = $_[1];	717	my $response = $_[1];
519	...	718	...
520	});	719	});
521		720
522	=over 4	721	=over 4
523		722
524	=cut	723	=cut
525		724
526	sub _drain_rbuf {	725	sub _drain_rbuf {
527	my ($self) = @_;	726	my ($self) = @_;
		727
		728	local $self->{_in_drain} = 1;
528		729
529	if (	730	if (
530	defined $self->{rbuf_max}	731	defined $self->{rbuf_max}
531	&& $self->{rbuf_max} < length $self->{rbuf}	732	&& $self->{rbuf_max} < length $self->{rbuf}
532	) {	733	) {
533	$! = &Errno::ENOSPC;	734	return $self->_error (&Errno::ENOSPC, 1);
534	$self->error;
535	}	735	}
536		736
537	return if $self->{in_drain};	737	while () {
538	local $self->{in_drain} = 1;
539
540	while (my $len = length $self->{rbuf}) {	738	my $len = length $self->{rbuf};
541	no strict 'refs';	739
542	if (my $cb = shift @{ $self->{_queue} }) {	740	if (my $cb = shift @{ $self->{_queue} }) {
543	unless ($cb->($self)) {	741	unless ($cb->($self)) {
544	if ($self->{_eof}) {	742	if ($self->{_eof}) {
545	# no progress can be made (not enough data and no data forthcoming)	743	# no progress can be made (not enough data and no data forthcoming)
546	$! = &Errno::EPIPE;	744	$self->_error (&Errno::EPIPE, 1), last;
547	$self->error;
548	}	745	}
549		746
550	unshift @{ $self->{_queue} }, $cb;	747	unshift @{ $self->{_queue} }, $cb;
551	return;	748	last;
552	}	749	}
553	} elsif ($self->{on_read}) {	750	} elsif ($self->{on_read}) {
		751	last unless $len;
		752
554	$self->{on_read}($self);	753	$self->{on_read}($self);
555		754
556	if (	755	if (
557	$self->{_eof} # if no further data will arrive
558	&& $len == length $self->{rbuf} # and no data has been consumed	756	$len == length $self->{rbuf} # if no data has been consumed
559	&& !@{ $self->{_queue} } # and the queue is still empty	757	&& !@{ $self->{_queue} } # and the queue is still empty
560	&& $self->{on_read} # and we still want to read data	758	&& $self->{on_read} # but we still have on_read
561	) {	759	) {
		760	# no further data will arrive
562	# then no progress can be made	761	# so no progress can be made
563	$! = &Errno::EPIPE;	762	$self->_error (&Errno::EPIPE, 1), last
564	$self->error;	763	if $self->{_eof};
		764
		765	last; # more data might arrive
565	}	766	}
566	} else {	767	} else {
567	# read side becomes idle	768	# read side becomes idle
568	delete $self->{_rw};	769	delete $self->{_rw};
569	return;	770	last;
570	}	771	}
571	}	772	}
572		773
573	if ($self->{_eof}) {	774	if ($self->{_eof}) {
574	$self->_shutdown;	775	if ($self->{on_eof}) {
575	$self->{on_eof}($self)	776	$self->{on_eof}($self)
576	if $self->{on_eof};	777	} else {
		778	$self->_error (0, 1);
		779	}
		780	}
		781
		782	# may need to restart read watcher
		783	unless ($self->{_rw}) {
		784	$self->start_read
		785	if $self->{on_read} \|\| @{ $self->{_queue} };
577	}	786	}
578	}	787	}
579		788
580	=item $handle->on_read ($cb)	789	=item $handle->on_read ($cb)
581		790
…		…
587		796
588	sub on_read {	797	sub on_read {
589	my ($self, $cb) = @_;	798	my ($self, $cb) = @_;
590		799
591	$self->{on_read} = $cb;	800	$self->{on_read} = $cb;
		801	$self->_drain_rbuf if $cb && !$self->{_in_drain};
592	}	802	}
593		803
594	=item $handle->rbuf	804	=item $handle->rbuf
595		805
596	Returns the read buffer (as a modifiable lvalue).	806	Returns the read buffer (as a modifiable lvalue).
…		…
645	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read")	855	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read")
646	->($self, $cb, @_);	856	->($self, $cb, @_);
647	}	857	}
648		858
649	push @{ $self->{_queue} }, $cb;	859	push @{ $self->{_queue} }, $cb;
650	$self->_drain_rbuf;	860	$self->_drain_rbuf unless $self->{_in_drain};
651	}	861	}
652		862
653	sub unshift_read {	863	sub unshift_read {
654	my $self = shift;	864	my $self = shift;
655	my $cb = pop;	865	my $cb = pop;
…		…
661	->($self, $cb, @_);	871	->($self, $cb, @_);
662	}	872	}
663		873
664		874
665	unshift @{ $self->{_queue} }, $cb;	875	unshift @{ $self->{_queue} }, $cb;
666	$self->_drain_rbuf;	876	$self->_drain_rbuf unless $self->{_in_drain};
667	}	877	}
668		878
669	=item $handle->push_read (type => @args, $cb)	879	=item $handle->push_read (type => @args, $cb)
670		880
671	=item $handle->unshift_read (type => @args, $cb)	881	=item $handle->unshift_read (type => @args, $cb)
…		…
701	$cb->($_[0], substr $_[0]{rbuf}, 0, $len, "");	911	$cb->($_[0], substr $_[0]{rbuf}, 0, $len, "");
702	1	912	1
703	}	913	}
704	};	914	};
705		915
706	# compatibility with older API
707	sub push_read_chunk {
708	$_[0]->push_read (chunk => $_[1], $_[2]);
709	}
710
711	sub unshift_read_chunk {
712	$_[0]->unshift_read (chunk => $_[1], $_[2]);
713	}
714
715	=item line => [$eol, ]$cb->($handle, $line, $eol)	916	=item line => [$eol, ]$cb->($handle, $line, $eol)
716		917
717	The callback will be called only once a full line (including the end of	918	The callback will be called only once a full line (including the end of
718	line marker, C<$eol>) has been read. This line (excluding the end of line	919	line marker, C<$eol>) has been read. This line (excluding the end of line
719	marker) will be passed to the callback as second argument (C<$line>), and	920	marker) will be passed to the callback as second argument (C<$line>), and
…		…
734	=cut	935	=cut
735		936
736	register_read_type line => sub {	937	register_read_type line => sub {
737	my ($self, $cb, $eol) = @_;	938	my ($self, $cb, $eol) = @_;
738		939
739	$eol = qr\|(\015?\012)\| if @_ < 3;	940	if (@_ < 3) {
		941	# this is more than twice as fast as the generic code below
		942	sub {
		943	$_[0]{rbuf} =~ s/^([^\015\012]*)(\015?\012)// or return;
		944
		945	$cb->($_[0], $1, $2);
		946	1
		947	}
		948	} else {
740	$eol = quotemeta $eol unless ref $eol;	949	$eol = quotemeta $eol unless ref $eol;
741	$eol = qr\|^(.*?)($eol)\|s;	950	$eol = qr\|^(.*?)($eol)\|s;
742		951
743	sub {	952	sub {
744	$_[0]{rbuf} =~ s/$eol// or return;	953	$_[0]{rbuf} =~ s/$eol// or return;
745		954
746	$cb->($_[0], $1, $2);	955	$cb->($_[0], $1, $2);
747	1
748	}
749	};
750
751	# compatibility with older API
752	sub push_read_line {
753	my $self = shift;
754	$self->push_read (line => @_);
755	}
756
757	sub unshift_read_line {
758	my $self = shift;
759	$self->unshift_read (line => @_);
760	}
761
762	=item netstring => $cb->($handle, $string)
763
764	A netstring (http://cr.yp.to/proto/netstrings.txt, this is not an endorsement).
765
766	Throws an error with C<$!> set to EBADMSG on format violations.
767
768	=cut
769
770	register_read_type netstring => sub {
771	my ($self, $cb) = @_;
772
773	sub {
774	unless ($_[0]{rbuf} =~ s/^(0\|[1-9][0-9]*)://) {
775	if ($_[0]{rbuf} =~ /[^0-9]/) {
776	$! = &Errno::EBADMSG;
777	$self->error;
778	}	956	1
779	return;
780	}
781
782	my $len = $1;
783
784	$self->unshift_read (chunk => $len, sub {
785	my $string = $_[1];
786	$_[0]->unshift_read (chunk => 1, sub {
787	if ($_[1] eq ",") {
788	$cb->($_[0], $string);
789	} else {
790	$! = &Errno::EBADMSG;
791	$self->error;
792	}
793	});
794	});	957	}
795
796	1
797	}	958	}
798	};	959	};
799		960
800	=item regex => $accept[, $reject[, $skip], $cb->($handle, $data)	961	=item regex => $accept[, $reject[, $skip], $cb->($handle, $data)
801		962
…		…
853	return 1;	1014	return 1;
854	}	1015	}
855		1016
856	# reject	1017	# reject
857	if ($reject && $$rbuf =~ $reject) {	1018	if ($reject && $$rbuf =~ $reject) {
858	$! = &Errno::EBADMSG;	1019	$self->_error (&Errno::EBADMSG);
859	$self->error;
860	}	1020	}
861		1021
862	# skip	1022	# skip
863	if ($skip && $$rbuf =~ $skip) {	1023	if ($skip && $$rbuf =~ $skip) {
864	$data .= substr $$rbuf, 0, $+[0], "";	1024	$data .= substr $$rbuf, 0, $+[0], "";
865	}	1025	}
866		1026
867	()	1027	()
		1028	}
		1029	};
		1030
		1031	=item netstring => $cb->($handle, $string)
		1032
		1033	A netstring (http://cr.yp.to/proto/netstrings.txt, this is not an endorsement).
		1034
		1035	Throws an error with C<$!> set to EBADMSG on format violations.
		1036
		1037	=cut
		1038
		1039	register_read_type netstring => sub {
		1040	my ($self, $cb) = @_;
		1041
		1042	sub {
		1043	unless ($_[0]{rbuf} =~ s/^(0\|[1-9][0-9]*)://) {
		1044	if ($_[0]{rbuf} =~ /[^0-9]/) {
		1045	$self->_error (&Errno::EBADMSG);
		1046	}
		1047	return;
		1048	}
		1049
		1050	my $len = $1;
		1051
		1052	$self->unshift_read (chunk => $len, sub {
		1053	my $string = $_[1];
		1054	$_[0]->unshift_read (chunk => 1, sub {
		1055	if ($_[1] eq ",") {
		1056	$cb->($_[0], $string);
		1057	} else {
		1058	$self->_error (&Errno::EBADMSG);
		1059	}
		1060	});
		1061	});
		1062
		1063	1
		1064	}
		1065	};
		1066
		1067	=item packstring => $format, $cb->($handle, $string)
		1068
		1069	An octet string prefixed with an encoded length. The encoding C<$format>
		1070	uses the same format as a Perl C<pack> format, but must specify a single
		1071	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an
		1072	optional C<!>, C<< < >> or C<< > >> modifier).
		1073
		1074	DNS over TCP uses a prefix of C<n>, EPP uses a prefix of C<N>.
		1075
		1076	Example: read a block of data prefixed by its length in BER-encoded
		1077	format (very efficient).
		1078
		1079	$handle->push_read (packstring => "w", sub {
		1080	my ($handle, $data) = @_;
		1081	});
		1082
		1083	=cut
		1084
		1085	register_read_type packstring => sub {
		1086	my ($self, $cb, $format) = @_;
		1087
		1088	sub {
		1089	# when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method
		1090	defined (my $len = eval { unpack $format, $_[0]{rbuf} })
		1091	or return;
		1092
		1093	$format = length pack $format, $len;
		1094
		1095	# bypass unshift if we already have the remaining chunk
		1096	if ($format + $len <= length $_[0]{rbuf}) {
		1097	my $data = substr $_[0]{rbuf}, $format, $len;
		1098	substr $_[0]{rbuf}, 0, $format + $len, "";
		1099	$cb->($_[0], $data);
		1100	} else {
		1101	# remove prefix
		1102	substr $_[0]{rbuf}, 0, $format, "";
		1103
		1104	# read remaining chunk
		1105	$_[0]->unshift_read (chunk => $len, $cb);
		1106	}
		1107
		1108	1
868	}	1109	}
869	};	1110	};
870		1111
871	=item json => $cb->($handle, $hash_or_arrayref)	1112	=item json => $cb->($handle, $hash_or_arrayref)
872		1113
…		…
885	the C<json> write type description, above, for an actual example.	1126	the C<json> write type description, above, for an actual example.
886		1127
887	=cut	1128	=cut
888		1129
889	register_read_type json => sub {	1130	register_read_type json => sub {
890	my ($self, $cb, $accept, $reject, $skip) = @_;	1131	my ($self, $cb) = @_;
891		1132
892	require JSON;	1133	require JSON;
893		1134
894	my $data;	1135	my $data;
895	my $rbuf = \$self->{rbuf};	1136	my $rbuf = \$self->{rbuf};
…		…
910	()	1151	()
911	}	1152	}
912	}	1153	}
913	};	1154	};
914		1155
		1156	=item storable => $cb->($handle, $ref)
		1157
		1158	Deserialises a L<Storable> frozen representation as written by the
		1159	C<storable> write type (BER-encoded length prefix followed by nfreeze'd
		1160	data).
		1161
		1162	Raises C<EBADMSG> error if the data could not be decoded.
		1163
		1164	=cut
		1165
		1166	register_read_type storable => sub {
		1167	my ($self, $cb) = @_;
		1168
		1169	require Storable;
		1170
		1171	sub {
		1172	# when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method
		1173	defined (my $len = eval { unpack "w", $_[0]{rbuf} })
		1174	or return;
		1175
		1176	my $format = length pack "w", $len;
		1177
		1178	# bypass unshift if we already have the remaining chunk
		1179	if ($format + $len <= length $_[0]{rbuf}) {
		1180	my $data = substr $_[0]{rbuf}, $format, $len;
		1181	substr $_[0]{rbuf}, 0, $format + $len, "";
		1182	$cb->($_[0], Storable::thaw ($data));
		1183	} else {
		1184	# remove prefix
		1185	substr $_[0]{rbuf}, 0, $format, "";
		1186
		1187	# read remaining chunk
		1188	$_[0]->unshift_read (chunk => $len, sub {
		1189	if (my $ref = eval { Storable::thaw ($_[1]) }) {
		1190	$cb->($_[0], $ref);
		1191	} else {
		1192	$self->_error (&Errno::EBADMSG);
		1193	}
		1194	});
		1195	}
		1196
		1197	1
		1198	}
		1199	};
		1200
915	=back	1201	=back
916		1202
917	=item AnyEvent::Handle::register_read_type type => $coderef->($handle, $cb, @args)	1203	=item AnyEvent::Handle::register_read_type type => $coderef->($handle, $cb, @args)
918		1204
919	This function (not method) lets you add your own types to C<push_read>.	1205	This function (not method) lets you add your own types to C<push_read>.
…		…
937	=item $handle->stop_read	1223	=item $handle->stop_read
938		1224
939	=item $handle->start_read	1225	=item $handle->start_read
940		1226
941	In rare cases you actually do not want to read anything from the	1227	In rare cases you actually do not want to read anything from the
942	socket. In this case you can call C<stop_read>. Neither C<on_read> no	1228	socket. In this case you can call C<stop_read>. Neither C<on_read> nor
943	any queued callbacks will be executed then. To start reading again, call	1229	any queued callbacks will be executed then. To start reading again, call
944	C<start_read>.	1230	C<start_read>.
		1231
		1232	Note that AnyEvent::Handle will automatically C<start_read> for you when
		1233	you change the C<on_read> callback or push/unshift a read callback, and it
		1234	will automatically C<stop_read> for you when neither C<on_read> is set nor
		1235	there are any read requests in the queue.
945		1236
946	=cut	1237	=cut
947		1238
948	sub stop_read {	1239	sub stop_read {
949	my ($self) = @_;	1240	my ($self) = @_;
…		…
960	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {	1251	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {
961	my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf};	1252	my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf};
962	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} \|\| 8192, length $$rbuf;	1253	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} \|\| 8192, length $$rbuf;
963		1254
964	if ($len > 0) {	1255	if ($len > 0) {
		1256	$self->{_activity} = AnyEvent->now;
		1257
965	$self->{filter_r}	1258	$self->{filter_r}
966	? $self->{filter_r}->($self, $rbuf)	1259	? $self->{filter_r}($self, $rbuf)
967	: $self->_drain_rbuf;	1260	: $self->{_in_drain} \|\| $self->_drain_rbuf;
968		1261
969	} elsif (defined $len) {	1262	} elsif (defined $len) {
970	delete $self->{_rw};	1263	delete $self->{_rw};
971	$self->{_eof} = 1;	1264	$self->{_eof} = 1;
972	$self->_drain_rbuf;	1265	$self->_drain_rbuf unless $self->{_in_drain};
973		1266
974	} elsif ($! != EAGAIN && $! != EINTR && $! != &AnyEvent::Util::WSAWOULDBLOCK) {	1267	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
975	return $self->error;	1268	return $self->_error ($!, 1);
976	}	1269	}
977	});	1270	});
978	}	1271	}
979	}	1272	}
980		1273
981	sub _dotls {	1274	sub _dotls {
982	my ($self) = @_;	1275	my ($self) = @_;
		1276
		1277	my $buf;
983		1278
984	if (length $self->{_tls_wbuf}) {	1279	if (length $self->{_tls_wbuf}) {
985	while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {	1280	while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {
986	substr $self->{_tls_wbuf}, 0, $len, "";	1281	substr $self->{_tls_wbuf}, 0, $len, "";
987	}	1282	}
988	}	1283	}
989		1284
990	if (defined (my $buf = Net::SSLeay::BIO_read ($self->{_wbio}))) {	1285	if (length ($buf = Net::SSLeay::BIO_read ($self->{_wbio}))) {
991	$self->{wbuf} .= $buf;	1286	$self->{wbuf} .= $buf;
992	$self->_drain_wbuf;	1287	$self->_drain_wbuf;
993	}	1288	}
994		1289
995	while (defined (my $buf = Net::SSLeay::read ($self->{tls}))) {	1290	while (defined ($buf = Net::SSLeay::read ($self->{tls}))) {
		1291	if (length $buf) {
996	$self->{rbuf} .= $buf;	1292	$self->{rbuf} .= $buf;
997	$self->_drain_rbuf;	1293	$self->_drain_rbuf unless $self->{_in_drain};
		1294	} else {
		1295	# let's treat SSL-eof as we treat normal EOF
		1296	$self->{_eof} = 1;
		1297	$self->_shutdown;
		1298	return;
		1299	}
998	}	1300	}
999		1301
1000	my $err = Net::SSLeay::get_error ($self->{tls}, -1);	1302	my $err = Net::SSLeay::get_error ($self->{tls}, -1);
1001		1303
1002	if ($err!= Net::SSLeay::ERROR_WANT_READ ()) {	1304	if ($err!= Net::SSLeay::ERROR_WANT_READ ()) {
1003	if ($err == Net::SSLeay::ERROR_SYSCALL ()) {	1305	if ($err == Net::SSLeay::ERROR_SYSCALL ()) {
1004	$self->error;	1306	return $self->_error ($!, 1);
1005	} elsif ($err == Net::SSLeay::ERROR_SSL ()) {	1307	} elsif ($err == Net::SSLeay::ERROR_SSL ()) {
1006	$! = &Errno::EIO;	1308	return $self->_error (&Errno::EIO, 1);
1007	$self->error;
1008	}	1309	}
1009		1310
1010	# all others are fine for our purposes	1311	# all others are fine for our purposes
1011	}	1312	}
1012	}	1313	}
…		…
1027	call and can be used or changed to your liking. Note that the handshake	1328	call and can be used or changed to your liking. Note that the handshake
1028	might have already started when this function returns.	1329	might have already started when this function returns.
1029		1330
1030	=cut	1331	=cut
1031		1332
1032	# TODO: maybe document...
1033	sub starttls {	1333	sub starttls {
1034	my ($self, $ssl, $ctx) = @_;	1334	my ($self, $ssl, $ctx) = @_;
1035		1335
1036	$self->stoptls;	1336	$self->stoptls;
1037		1337
…		…
1090		1390
1091	sub DESTROY {	1391	sub DESTROY {
1092	my $self = shift;	1392	my $self = shift;
1093		1393
1094	$self->stoptls;	1394	$self->stoptls;
		1395
		1396	my $linger = exists $self->{linger} ? $self->{linger} : 3600;
		1397
		1398	if ($linger && length $self->{wbuf}) {
		1399	my $fh = delete $self->{fh};
		1400	my $wbuf = delete $self->{wbuf};
		1401
		1402	my @linger;
		1403
		1404	push @linger, AnyEvent->io (fh => $fh, poll => "w", cb => sub {
		1405	my $len = syswrite $fh, $wbuf, length $wbuf;
		1406
		1407	if ($len > 0) {
		1408	substr $wbuf, 0, $len, "";
		1409	} else {
		1410	@linger = (); # end
		1411	}
		1412	});
		1413	push @linger, AnyEvent->timer (after => $linger, cb => sub {
		1414	@linger = ();
		1415	});
		1416	}
1095	}	1417	}
1096		1418
1097	=item AnyEvent::Handle::TLS_CTX	1419	=item AnyEvent::Handle::TLS_CTX
1098		1420
1099	This function creates and returns the Net::SSLeay::CTX object used by	1421	This function creates and returns the Net::SSLeay::CTX object used by
…		…
1141	=over 4	1463	=over 4
1142		1464
1143	=item * all constructor arguments become object members.	1465	=item * all constructor arguments become object members.
1144		1466
1145	At least initially, when you pass a C<tls>-argument to the constructor it	1467	At least initially, when you pass a C<tls>-argument to the constructor it
1146	will end up in C<< $handle->{tls} >>. Those members might be changes or	1468	will end up in C<< $handle->{tls} >>. Those members might be changed or
1147	mutated later on (for example C<tls> will hold the TLS connection object).	1469	mutated later on (for example C<tls> will hold the TLS connection object).
1148		1470
1149	=item * other object member names are prefixed with an C<_>.	1471	=item * other object member names are prefixed with an C<_>.
1150		1472
1151	All object members not explicitly documented (internal use) are prefixed	1473	All object members not explicitly documented (internal use) are prefixed

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Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents): Revision 1.41 by root, Tue May 27 05:47:36 2008 UTC vs. Revision 1.80 by root, Sun Jul 27 08:43:32 2008 UTC

Diff Legend

Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents):
Revision 1.41 by root, Tue May 27 05:47:36 2008 UTC vs.
Revision 1.80 by root, Sun Jul 27 08:43:32 2008 UTC