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Revision 1.17 by root, Wed Oct 31 21:34:45 2007 UTC vs.
Revision 1.29 by root, Tue Nov 6 17:20:42 2007 UTC

1=head1 NAME 1=head1 NAME
2 2
3EV - perl interface to libevent, monkey.org/~provos/libevent/ 3EV - perl interface to libev, a high performance full-featured event loop
4 4
5=head1 SYNOPSIS 5=head1 SYNOPSIS
6 6
7 use EV; 7 use EV;
8 8
9 # TIMER 9 # TIMERS
10 10
11 my $w = EV::timer 2, 0, sub { 11 my $w = EV::timer 2, 0, sub {
12 warn "is called after 2s"; 12 warn "is called after 2s";
13 }; 13 };
14 14
… …
16 warn "is called roughly every 2s (repeat = 1)"; 16 warn "is called roughly every 2s (repeat = 1)";
17 }; 17 };
18 18
19 undef $w; # destroy event watcher again 19 undef $w; # destroy event watcher again
20 20
21 my $w = EV::timer_abs 0, 60, sub { 21 my $w = EV::periodic 0, 60, sub {
22 warn "is called every minute, on the minute, exactly"; 22 warn "is called every minute, on the minute, exactly";
23 }; 23 };
24 24
25 # IO 25 # IO
26 26
27 my $w = EV::io \*STDIN, EV::READ | EV::PERSIST, sub { 27 my $w = EV::io *STDIN, EV::READ, sub {
28 my ($w, $revents) = @_; # all callbacks get the watcher object and event mask 28 my ($w, $revents) = @_; # all callbacks get the watcher object and event mask
29 if ($revents & EV::TIMEOUT) {
30 warn "nothing received on stdin for 10 seconds, retrying";
31 } else {
32 warn "stdin is readable, you entered: ", <STDIN>; 29 warn "stdin is readable, you entered: ", <STDIN>;
33 }
34 };
35 $w->timeout (10);
36
37 my $w = EV::timed_io \*STDIN, EV::READ, 30, sub {
38 my ($w, $revents) = @_;
39 if ($revents & EV::TIMEOUT) {
40 warn "nothing entered within 30 seconds, bye bye.\n";
41 $w->stop;
42 } else {
43 my $line = <STDIN>;
44 warn "you entered something, you again have 30 seconds.\n";
45 }
46 }; 30 };
47 31
48 # SIGNALS 32 # SIGNALS
49 33
50 my $w = EV::signal 'QUIT', sub { 34 my $w = EV::signal 'QUIT', sub {
… …
56 }; 40 };
57 41
58 # CHILD/PID STATUS CHANGES 42 # CHILD/PID STATUS CHANGES
59 43
60 my $w = EV::child 666, sub { 44 my $w = EV::child 666, sub {
61 my ($w, $revents, $status) = @_; 45 my ($w, $revents) = @_;
46 # my $pid = $w->rpid;
47 my $status = $w->rstatus;
62 }; 48 };
63 49
64 # MAINLOOP 50 # MAINLOOP
65 EV::dispatch; # loop as long as watchers are active 51 EV::loop; # loop until EV::loop_done is called
66 EV::loop; # the same thing
67 EV::loop EV::LOOP_ONESHOT; # block until some events could be handles 52 EV::loop EV::LOOP_ONESHOT; # block until at least one event could be handled
68 EV::loop EV::LOOP_NONBLOCK; # check and handle some events, but do not wait 53 EV::loop EV::LOOP_NONBLOCK; # try to handle same events, but do not block
69 54
70=head1 DESCRIPTION 55=head1 DESCRIPTION
71 56
72This module provides an interface to libev 57This module provides an interface to libev
73(L<http://software.schmorp.de/pkg/libev.html>). You probably should 58(L<http://software.schmorp.de/pkg/libev.html>).
74acquaint yourself with its documentation and source code to be able to use
75this module fully.
76 59
77=cut 60=cut
78 61
79package EV; 62package EV;
80 63
81use strict; 64use strict;
82 65
83BEGIN { 66BEGIN {
84 our $VERSION = '0.03'; 67 our $VERSION = '0.51';
85 use XSLoader; 68 use XSLoader;
86 XSLoader::load "EV", $VERSION; 69 XSLoader::load "EV", $VERSION;
87} 70}
88 71
89@EV::Io::ISA = "EV::Watcher"; 72@EV::Io::ISA =
90@EV::Time::ISA = "EV::Watcher";
91@EV::Timer::ISA = "EV::Time"; 73@EV::Timer::ISA =
92@EV::Periodic::ISA = "EV::Time"; 74@EV::Periodic::ISA =
93@EV::Signal::ISA = "EV::Watcher"; 75@EV::Signal::ISA =
94@EV::Idle::ISA = "EV::Watcher"; 76@EV::Idle::ISA =
95@EV::Prepare::ISA = "EV::Watcher"; 77@EV::Prepare::ISA =
96@EV::Check::ISA = "EV::Watcher"; 78@EV::Check::ISA =
97@EV::Child::ISA = "EV::Watcher"; 79@EV::Child::ISA = "EV::Watcher";
98 80
99=head1 BASIC INTERFACE 81=head1 BASIC INTERFACE
100 82
101=over 4 83=over 4
102
103=item $EV::NPRI
104
105How many priority levels are available.
106 84
107=item $EV::DIED 85=item $EV::DIED
108 86
109Must contain a reference to a function that is called when a callback 87Must contain a reference to a function that is called when a callback
110throws an exception (with $@ containing thr error). The default prints an 88throws an exception (with $@ containing thr error). The default prints an
111informative message and continues. 89informative message and continues.
112 90
113If this callback throws an exception it will be silently ignored. 91If this callback throws an exception it will be silently ignored.
114 92
93=item $time = EV::time
94
95Returns the current time in (fractional) seconds since the epoch.
96
115=item $time = EV::now 97=item $time = EV::now
116 98
117Returns the time in (fractional) seconds since the epoch. 99Returns the time the last event loop iteration has been started. This
100is the time that (relative) timers are based on, and refering to it is
101usually faster then calling EV::time.
118 102
119=item $version = EV::version
120
121=item $method = EV::method 103=item $method = EV::ev_method
122 104
123Return version string and event polling method used. 105Returns an integer describing the backend used by libev (EV::METHOD_SELECT
106or EV::METHOD_EPOLL).
124 107
125=item EV::loop $flags # EV::LOOP_ONCE, EV::LOOP_ONESHOT 108=item EV::loop [$flags]
126 109
127=item EV::loopexit $after 110Begin checking for events and calling callbacks. It returns when a
111callback calls EV::loop_done.
128 112
129Exit any active loop or dispatch after C<$after> seconds or immediately if 113The $flags argument can be one of the following:
130C<$after> is missing or zero.
131 114
132=item EV::dispatch 115 0 as above
116 EV::LOOP_ONESHOT block at most once (wait, but do not loop)
117 EV::LOOP_NONBLOCK do not block at all (fetch/handle events but do not wait)
133 118
134Same as C<EV::loop 0>. 119=item EV::loop_done [$how]
135 120
136=item EV::event $callback 121When called with no arguments or an argument of 1, makes the innermost
122call to EV::loop return.
137 123
138Creates a new event watcher waiting for nothing, calling the given callback. 124When called with an agrument of 2, all calls to EV::loop will return as
125fast as possible.
139 126
127=back
128
129=head2 WATCHER
130
131A watcher is an object that gets created to record your interest in some
132event. For instance, if you want to wait for STDIN to become readable, you
133would create an EV::io watcher for that:
134
135 my $watcher = EV::io *STDIN, EV::READ, sub {
136 my ($watcher, $revents) = @_;
137 warn "yeah, STDIN should not be readable without blocking!\n"
138 };
139
140All watchers can be active (waiting for events) or inactive (paused). Only
141active watchers will have their callbacks invoked. All callbacks will be
142called with at least two arguments: the watcher and a bitmask of received
143events.
144
145Each watcher type has its associated bit in revents, so you can use the
146same callback for multiple watchers. The event mask is named after the
147type, i..e. EV::child sets EV::CHILD, EV::prepare sets EV::PREPARE,
148EV::periodic sets EV::PERIODIC and so on, with the exception of IO events
149(which can set both EV::READ and EV::WRITE bits), and EV::timer (which
150uses EV::TIMEOUT).
151
152In the rare case where one wants to create a watcher but not start it at
153the same time, each constructor has a variant with a trailing C<_ns> in
154its name, e.g. EV::io has a non-starting variant EV::io_ns and so on.
155
156Please note that a watcher will automatically be stopped when the watcher
157object is destroyed, so you I<need> to keep the watcher objects returned by
158the constructors.
159
160Also, all methods changing some aspect of a watcher (->set, ->priority,
161->fh and so on) automatically stop and start it again if it is active,
162which means pending events get lost.
163
164=head2 WATCHER TYPES
165
166Now lets move to the existing watcher types and asociated methods.
167
168The following methods are available for all watchers. Then followes a
169description of each watcher constructor (EV::io, EV::timer, EV::periodic,
170EV::signal, EV::child, EV::idle, EV::prepare and EV::check), followed by
171any type-specific methods (if any).
172
173=over 4
174
175=item $w->start
176
177Starts a watcher if it isn't active already. Does nothing to an already
178active watcher. By default, all watchers start out in the active state
179(see the description of the C<_ns> variants if you need stopped watchers).
180
181=item $w->stop
182
183Stop a watcher if it is active. Also clear any pending events (events that
184have been received but that didn't yet result in a callback invocation),
185regardless of wether the watcher was active or not.
186
187=item $bool = $w->is_active
188
189Returns true if the watcher is active, false otherwise.
190
191=item $current_cb = $w->cb
192
193=item $old_cb = $w->cb ($new_cb)
194
195Queries the callback on the watcher and optionally changes it. You can do
196this at any time without the watcher restarting.
197
198=item $current_priority = $w->priority
199
200=item $old_priority = $w->priority ($new_priority)
201
202Queries the priority on the watcher and optionally changes it. Pending
203watchers with higher priority will be invoked first. The valid range of
204priorities lies between EV::MAXPRI (default 2) and EV::MINPRI (default
205-2). If the priority is outside this range it will automatically be
206normalised to the nearest valid priority.
207
208The default priority of any newly-created weatcher is 0.
209
210=item $w->trigger ($revents)
211
212Call the callback *now* with the given event mask.
213
214
140=item my $w = EV::io $fileno_or_fh, $eventmask, $callback 215=item $w = EV::io $fileno_or_fh, $eventmask, $callback
141 216
142=item my $w = EV::io_ns $fileno_or_fh, $eventmask, $callback 217=item $w = EV::io_ns $fileno_or_fh, $eventmask, $callback
143 218
144As long as the returned watcher object is alive, call the C<$callback> 219As long as the returned watcher object is alive, call the C<$callback>
145when the events specified in C<$eventmask> happen. Initially, the timeout 220when the events specified in C<$eventmask>.
146is disabled.
147 221
148You can additionall set a timeout to occur on the watcher, but note that
149this timeout will not be reset when you get an I/O event in the EV::PERSIST
150case, and reaching a timeout will always stop the watcher even in the
151EV::PERSIST case.
152
153If you want a timeout to occur only after a specific time of inactivity, set
154a repeating timeout and do NOT use EV::PERSIST.
155
156Eventmask can be one or more of these constants ORed together: 222The $eventmask can be one or more of these constants ORed together:
157 223
158 EV::READ wait until read() wouldn't block anymore 224 EV::READ wait until read() wouldn't block anymore
159 EV::WRITE wait until write() wouldn't block anymore 225 EV::WRITE wait until write() wouldn't block anymore
160 EV::PERSIST stay active after a (non-timeout) event occured
161 226
162The C<io_ns> variant doesn't add/start the newly created watcher. 227The C<io_ns> variant doesn't start (activate) the newly created watcher.
163 228
164=item my $w = EV::timed_io $fileno_or_fh, $eventmask, $timeout, $callback 229=item $w->set ($fileno_or_fh, $eventmask)
165 230
166=item my $w = EV::timed_io_ns $fileno_or_fh, $eventmask, $timeout, $callback 231Reconfigures the watcher, see the constructor above for details. Can be
232called at any time.
167 233
168Same as C<io> and C<io_ns>, but also specifies a timeout (as if there was 234=item $current_fh = $w->fh
169a call to C<< $w->timeout ($timout, 1) >>. The persist flag is not allowed
170and will automatically be cleared. The watcher will be restarted after each event.
171 235
172If the timeout is zero or undef, no timeout will be set, and a normal 236=item $old_fh = $w->fh ($new_fh)
173watcher (with the persist flag set!) will be created.
174 237
175This has the effect of timing out after the specified period of inactivity 238Returns the previously set filehandle and optionally set a new one.
176has happened.
177 239
178Due to the design of libevent, this is also relatively inefficient, having 240=item $current_eventmask = $w->events
179one or two io watchers and a separate timeout watcher that you reset on
180activity (by calling its C<start> method) is usually more efficient.
181 241
242=item $old_eventmask = $w->events ($new_eventmask)
243
244Returns the previously set event mask and optionally set a new one.
245
246
182=item my $w = EV::timer $after, $repeat, $callback 247=item $w = EV::timer $after, $repeat, $callback
183 248
184=item my $w = EV::timer_ns $after, $repeat, $callback 249=item $w = EV::timer_ns $after, $repeat, $callback
185 250
186Calls the callback after C<$after> seconds. If C<$repeat> is true, the 251Calls the callback after C<$after> seconds. If C<$repeat> is non-zero,
187timer will be restarted after the callback returns. This means that the 252the timer will be restarted (with the $repeat value as $after) after the
188callback would be called roughly every C<$after> seconds, prolonged by the 253callback returns.
189time the callback takes.
190 254
255This means that the callback would be called roughly after C<$after>
256seconds, and then every C<$repeat> seconds. "Roughly" because the time of
257callback processing is not taken into account, so the timer will slowly
258drift. If that isn't acceptable, look at EV::periodic.
259
260The timer is based on a monotonic clock, that is if somebody is sitting
261in front of the machine while the timer is running and changes the system
262clock, the timer will nevertheless run (roughly) the same time.
263
191The C<timer_ns> variant doesn't add/start the newly created watcher. 264The C<timer_ns> variant doesn't start (activate) the newly created watcher.
192 265
266=item $w->set ($after, $repeat)
267
268Reconfigures the watcher, see the constructor above for details. Can be at
269any time.
270
271=item $w->again
272
273Similar to the C<start> method, but has special semantics for repeating timers:
274
275If the timer is active and repeating, reset the timeout to occur
276C<$repeat> seconds after now.
277
278If the timer is active and non-repeating, it will be stopped.
279
280If the timer is in active and repeating, start it.
281
282Otherwise do nothing.
283
284This behaviour is useful when you have a timeout for some IO
285operation. You create a timer object with the same value for C<$after> and
286C<$repeat>, and then, in the read/write watcher, run the C<again> method
287on the timeout.
288
289
290=item $w = EV::periodic $at, $interval, $callback
291
193=item my $w = EV::timer_abs $at, $interval, $callback 292=item $w = EV::periodic_ns $at, $interval, $callback
194
195=item my $w = EV::timer_abs_ns $at, $interval, $callback
196 293
197Similar to EV::timer, but the time is given as an absolute point in time 294Similar to EV::timer, but the time is given as an absolute point in time
198(C<$at>), plus an optional C<$interval>. 295(C<$at>), plus an optional C<$interval>.
199 296
200If the C<$interval> is zero, then the callback will be called at the time 297If the C<$interval> is zero, then the callback will be called at the time
201C<$at> if that is in the future, or as soon as possible if its in the 298C<$at> if that is in the future, or as soon as possible if it is in the
202past. It will not automatically repeat. 299past. It will not automatically repeat.
203 300
204If the C<$interval> is nonzero, then the watcher will always be scheduled 301If the C<$interval> is nonzero, then the watcher will always be scheduled
205to time out at the next C<$at + integer * $interval> time. 302to time out at the next C<$at + N * $interval> time.
206 303
207This can be used to schedule a callback to run at very regular intervals, 304This can be used to schedule a callback to run at very regular intervals,
208as long as the processing time is less then the interval (otherwise 305as long as the processing time is less then the interval (otherwise
209obviously events will be skipped). 306obviously events will be skipped).
210 307
211Another way to think about it (for the mathematically inclined) is that 308Another way to think about it (for the mathematically inclined) is that
212C<timer_abs> will try to tun the callback at the next possible time where 309EV::periodic will try to run the callback at the next possible time where
213C<$time = $at (mod $interval)>, regardless of any time jumps. 310C<$time = $at (mod $interval)>, regardless of any time jumps.
214 311
312This periodic timer is based on "wallclock time", that is, if the clock
313changes (C<ntp>, C<date -s> etc.), then the timer will nevertheless run at
314the specified time. This means it will never drift (it might jitter, but
315it will not drift).
316
215The C<timer_abs_ns> variant doesn't add/start the newly created watcher. 317The C<periodic_ns> variant doesn't start (activate) the newly created watcher.
216 318
319=item $w->set ($at, $interval)
320
321Reconfigures the watcher, see the constructor above for details. Can be at
322any time.
323
324
217=item my $w = EV::signal $signal, $callback 325=item $w = EV::signal $signal, $callback
218 326
219=item my $w = EV::signal_ns $signal, $callback 327=item $w = EV::signal_ns $signal, $callback
220 328
221Call the callback when $signal is received (the signal can be specified 329Call the callback when $signal is received (the signal can be specified
222by number or by name, just as with kill or %SIG). Signal watchers are 330by number or by name, just as with kill or %SIG).
223persistent no natter what.
224 331
225EV will grab the signal for the process (the kernel only allows one 332EV will grab the signal for the process (the kernel only allows one
226component to receive signals) when you start a signal watcher, and 333component to receive a signal at a time) when you start a signal watcher,
227removes it again when you stop it. Pelr does the same when you add/remove 334and removes it again when you stop it. Perl does the same when you
228callbacks to %SIG, so watch out. 335add/remove callbacks to %SIG, so watch out.
229 336
230Unfortunately, only one handler can be registered per signal. Screw 337You can have as many signal watchers per signal as you want.
231libevent.
232 338
233The C<signal_ns> variant doesn't add/start the newly created watcher. 339The C<signal_ns> variant doesn't start (activate) the newly created watcher.
340
341=item $w->set ($signal)
342
343Reconfigures the watcher, see the constructor above for details. Can be at
344any time.
345
346=item $current_signum = $w->signal
347
348=item $old_signum = $w->signal ($new_signal)
349
350Returns the previously set signal (always as a number not name) and
351optionally set a new one.
352
353
354=item $w = EV::child $pid, $callback
355
356=item $w = EV::child_ns $pid, $callback
357
358Call the callback when a status change for pid C<$pid> (or any pid
359if C<$pid> is 0) has been received. More precisely: when the process
360receives a SIGCHLD, EV will fetch the outstanding exit/wait status for all
361changed/zombie children and call the callback.
362
363You can access both status and pid by using the C<rstatus> and C<rpid>
364methods on the watcher object.
365
366You can have as many pid watchers per pid as you want.
367
368The C<child_ns> variant doesn't start (activate) the newly created watcher.
369
370=item $w->set ($pid)
371
372Reconfigures the watcher, see the constructor above for details. Can be at
373any time.
374
375=item $current_pid = $w->pid
376
377=item $old_pid = $w->pid ($new_pid)
378
379Returns the previously set process id and optionally set a new one.
380
381=item $exit_status = $w->rstatus
382
383Return the exit/wait status (as returned by waitpid, see the waitpid entry
384in perlfunc).
385
386=item $pid = $w->rpid
387
388Return the pid of the awaited child (useful when you have installed a
389watcher for all pids).
390
391
392=item $w = EV::idle $callback
393
394=item $w = EV::idle_ns $callback
395
396Call the callback when there are no pending io, timer/periodic, signal or
397child events, i.e. when the process is idle.
398
399The process will not block as long as any idle watchers are active, and
400they will be called repeatedly until stopped.
401
402The C<idle_ns> variant doesn't start (activate) the newly created watcher.
403
404
405=item $w = EV::prepare $callback
406
407=item $w = EV::prepare_ns $callback
408
409Call the callback just before the process would block. You can still
410create/modify any watchers at this point.
411
412See the EV::check watcher, below, for explanations and an example.
413
414The C<prepare_ns> variant doesn't start (activate) the newly created watcher.
415
416
417=item $w = EV::check $callback
418
419=item $w = EV::check_ns $callback
420
421Call the callback just after the process wakes up again (after it has
422gathered events), but before any other callbacks have been invoked.
423
424This is used to integrate other event-based software into the EV
425mainloop: You register a prepare callback and in there, you create io and
426timer watchers as required by the other software. Here is a real-world
427example of integrating Net::SNMP (with some details left out):
428
429 our @snmp_watcher;
430
431 our $snmp_prepare = EV::prepare sub {
432 # do nothing unless active
433 $dispatcher->{_event_queue_h}
434 or return;
435
436 # make the dispatcher handle any outstanding stuff
437
438 # create an IO watcher for each and every socket
439 @snmp_watcher = (
440 (map { EV::io $_, EV::READ, sub { } }
441 keys %{ $dispatcher->{_descriptors} }),
442 );
443
444 # if there are any timeouts, also create a timer
445 push @snmp_watcher, EV::timer $event->[Net::SNMP::Dispatcher::_TIME] - EV::now, 0, sub { }
446 if $event->[Net::SNMP::Dispatcher::_ACTIVE];
447 };
448
449The callbacks are irrelevant, the only purpose of those watchers is
450to wake up the process as soon as one of those events occurs (socket
451readable, or timer timed out). The corresponding EV::check watcher will then
452clean up:
453
454 our $snmp_check = EV::check sub {
455 # destroy all watchers
456 @snmp_watcher = ();
457
458 # make the dispatcher handle any new stuff
459 };
460
461The callbacks of the created watchers will not be called as the watchers
462are destroyed before this cna happen (remember EV::check gets called
463first).
464
465The C<check_ns> variant doesn't start (activate) the newly created watcher.
234 466
235=back 467=back
236 468
237=head1 THE EV::Event CLASS
238
239All EV functions creating an event watcher (designated by C<my $w =>
240above) support the following methods on the returned watcher object:
241
242=over 4
243
244=item $w->add ($timeout)
245
246Stops and (re-)starts the event watcher, setting the optional timeout to
247the given value, or clearing the timeout if none is given.
248
249=item $w->start
250
251Stops and (re-)starts the event watcher without touching the timeout.
252
253=item $w->del
254
255=item $w->stop
256
257Stop the event watcher if it was started.
258
259=item $current_callback = $w->cb
260
261=item $old_callback = $w->cb ($new_callback)
262
263Return the previously set callback and optionally set a new one.
264
265=item $current_fh = $w->fh
266
267=item $old_fh = $w->fh ($new_fh)
268
269Returns the previously set filehandle and optionally set a new one (also
270clears the EV::SIGNAL flag when setting a filehandle).
271
272=item $current_signal = $w->signal
273
274=item $old_signal = $w->signal ($new_signal)
275
276Returns the previously set signal number and optionally set a new one (also sets
277the EV::SIGNAL flag when setting a signal).
278
279=item $current_eventmask = $w->events
280
281=item $old_eventmask = $w->events ($new_eventmask)
282
283Returns the previously set event mask and optionally set a new one.
284
285=item $w->timeout ($after, $repeat)
286
287Resets the timeout (see C<EV::timer> for details).
288
289=item $w->timeout_abs ($at, $interval)
290
291Resets the timeout (see C<EV::timer_abs> for details).
292
293=item $w->priority_set ($priority)
294
295Set the priority of the watcher to C<$priority> (0 <= $priority < $EV::NPRI).
296
297=back
298
299=head1 THREADS 469=head1 THREADS
300 470
301Threads are not supported by this in any way. Perl pseudo-threads is evil 471Threads are not supported by this in any way. Perl pseudo-threads is evil
302and must die. 472stuff and must die.
303
304=head1 BUGS
305
306Lots. Libevent itself isn't well tested and rather buggy, and this module
307is quite new at the moment.
308
309Please note that the epoll method is not, in general, reliable in programs
310that use fork (even if no libveent calls are being made in the forked
311process). If your program behaves erratically, try setting the environment
312variable C<EVENT_NOEPOLL> first when running the program.
313
314In general, if you fork, then you can only use the EV module in one of the
315children.
316 473
317=cut 474=cut
318 475
319our $DIED = sub { 476our $DIED = sub {
320 warn "EV: error in callback (ignoring): $@"; 477 warn "EV: error in callback (ignoring): $@";
321}; 478};
322 479
323init; 480default_loop
481 or die 'EV: cannot initialise libev backend. bad $ENV{LIBEV_METHODS}?';
324 482
325push @AnyEvent::REGISTRY, [EV => "EV::AnyEvent"]; 483push @AnyEvent::REGISTRY, [EV => "EV::AnyEvent"];
326 484
3271; 4851;
328 486
329=head1 SEE ALSO 487=head1 SEE ALSO
330 488
331 L<EV::DNS>, L<event(3)>, L<event.h>, L<evdns.h>.
332 L<EV::AnyEvent>. 489 L<EV::DNS>, L<EV::AnyEvent>.
333 490
334=head1 AUTHOR 491=head1 AUTHOR
335 492
336 Marc Lehmann <schmorp@schmorp.de> 493 Marc Lehmann <schmorp@schmorp.de>
337 http://home.schmorp.de/ 494 http://home.schmorp.de/

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