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Revision 1.362 by root, Sun Aug 14 01:57:18 2011 UTC vs.
Revision 1.381 by root, Thu Sep 1 22:09:25 2011 UTC

1=head1 NAME 1=head1 NAME
2 2
3AnyEvent - the DBI of event loop programming 3AnyEvent - the DBI of event loop programming
4 4
5EV, Event, Glib, Tk, Perl, Event::Lib, Irssi, rxvt-unicode, IO::Async, Qt 5EV, Event, Glib, Tk, Perl, Event::Lib, Irssi, rxvt-unicode, IO::Async, Qt,
6and POE are various supported event loops/environments. 6FLTK and POE are various supported event loops/environments.
7 7
8=head1 SYNOPSIS 8=head1 SYNOPSIS
9 9
10 use AnyEvent; 10 use AnyEvent;
11 11
… …
878 AnyEvent::Impl::EventLib based on Event::Lib, leaks memory and worse. 878 AnyEvent::Impl::EventLib based on Event::Lib, leaks memory and worse.
879 AnyEvent::Impl::POE based on POE, very slow, some limitations. 879 AnyEvent::Impl::POE based on POE, very slow, some limitations.
880 AnyEvent::Impl::Irssi used when running within irssi. 880 AnyEvent::Impl::Irssi used when running within irssi.
881 AnyEvent::Impl::IOAsync based on IO::Async. 881 AnyEvent::Impl::IOAsync based on IO::Async.
882 AnyEvent::Impl::Cocoa based on Cocoa::EventLoop. 882 AnyEvent::Impl::Cocoa based on Cocoa::EventLoop.
883 AnyEvent::Impl::FLTK2 based on FLTK (fltk 2 binding). 883 AnyEvent::Impl::FLTK based on FLTK (fltk 2 binding).
884 884
885=item Backends with special needs. 885=item Backends with special needs.
886 886
887Qt requires the Qt::Application to be instantiated first, but will 887Qt requires the Qt::Application to be instantiated first, but will
888otherwise be picked up automatically. As long as the main program 888otherwise be picked up automatically. As long as the main program
… …
1049It should use C<postpone>: 1049It should use C<postpone>:
1050 1050
1051 AnyEvent::postpone { $cb->(undef) }, return # signal error to callback, later 1051 AnyEvent::postpone { $cb->(undef) }, return # signal error to callback, later
1052 if $some_error_condition; 1052 if $some_error_condition;
1053 1053
1054=item AnyEvent::log $level, $msg[, @args]
1055
1056Log the given C<$msg> at the given C<$level>.
1057
1058If L<AnyEvent::Log> is not loaded then this function makes a simple test
1059to see whether the message will be logged. If the test succeeds it will
1060load AnyEvent::Log and call C<AnyEvent::Log::log> - consequently, look at
1061the L<AnyEvent::Log> documentation for details.
1062
1063If the test fails it will simply return. Right now this happens when a
1064numerical loglevel is used and it is larger than the level specified via
1065C<$ENV{PERL_ANYEVENT_VERBOSE}>.
1066
1067If you want to sprinkle loads of logging calls around your code, consider
1068creating a logger callback with the C<AnyEvent::Log::logger> function,
1069which can reduce typing, codesize and can reduce the logging overhead
1070enourmously.
1071
1054=back 1072=back
1055 1073
1056=head1 WHAT TO DO IN A MODULE 1074=head1 WHAT TO DO IN A MODULE
1057 1075
1058As a module author, you should C<use AnyEvent> and call AnyEvent methods 1076As a module author, you should C<use AnyEvent> and call AnyEvent methods
… …
1114 1132
1115 1133
1116=head1 OTHER MODULES 1134=head1 OTHER MODULES
1117 1135
1118The following is a non-exhaustive list of additional modules that use 1136The following is a non-exhaustive list of additional modules that use
1119AnyEvent as a client and can therefore be mixed easily with other AnyEvent 1137AnyEvent as a client and can therefore be mixed easily with other
1120modules and other event loops in the same program. Some of the modules 1138AnyEvent modules and other event loops in the same program. Some of the
1121come as part of AnyEvent, the others are available via CPAN. 1139modules come as part of AnyEvent, the others are available via CPAN (see
1140L<http://search.cpan.org/search?m=module&q=anyevent%3A%3A*> for
1141a longer non-exhaustive list), and the list is heavily biased towards
1142modules of the AnyEvent author himself :)
1122 1143
1123=over 4 1144=over 4
1124 1145
1125=item L<AnyEvent::Util> 1146=item L<AnyEvent::Util>
1126 1147
… …
1146=item L<AnyEvent::HTTP>, L<AnyEvent::IRC>, L<AnyEvent::XMPP>, L<AnyEvent::GPSD>, L<AnyEvent::IGS>, L<AnyEvent::FCP> 1167=item L<AnyEvent::HTTP>, L<AnyEvent::IRC>, L<AnyEvent::XMPP>, L<AnyEvent::GPSD>, L<AnyEvent::IGS>, L<AnyEvent::FCP>
1147 1168
1148Implement event-based interfaces to the protocols of the same name (for 1169Implement event-based interfaces to the protocols of the same name (for
1149the curious, IGS is the International Go Server and FCP is the Freenet 1170the curious, IGS is the International Go Server and FCP is the Freenet
1150Client Protocol). 1171Client Protocol).
1151
1152=item L<AnyEvent::Handle::UDP>
1153
1154Here be danger!
1155
1156As Pauli would put it, "Not only is it not right, it's not even wrong!" -
1157there are so many things wrong with AnyEvent::Handle::UDP, most notably
1158its use of a stream-based API with a protocol that isn't streamable, that
1159the only way to improve it is to delete it.
1160
1161It features data corruption (but typically only under load) and general
1162confusion. On top, the author is not only clueless about UDP but also
1163fact-resistant - some gems of his understanding: "connect doesn't work
1164with UDP", "UDP packets are not IP packets", "UDP only has datagrams, not
1165packets", "I don't need to implement proper error checking as UDP doesn't
1166support error checking" and so on - he doesn't even understand what's
1167wrong with his module when it is explained to him.
1168
1169=item L<AnyEvent::DBI>
1170
1171Executes L<DBI> requests asynchronously in a proxy process for you,
1172notifying you in an event-based way when the operation is finished.
1173 1172
1174=item L<AnyEvent::AIO> 1173=item L<AnyEvent::AIO>
1175 1174
1176Truly asynchronous (as opposed to non-blocking) I/O, should be in the 1175Truly asynchronous (as opposed to non-blocking) I/O, should be in the
1177toolbox of every event programmer. AnyEvent::AIO transparently fuses 1176toolbox of every event programmer. AnyEvent::AIO transparently fuses
1178L<IO::AIO> and AnyEvent together, giving AnyEvent access to event-based 1177L<IO::AIO> and AnyEvent together, giving AnyEvent access to event-based
1179file I/O, and much more. 1178file I/O, and much more.
1180 1179
1180=item L<AnyEvent::Filesys::Notify>
1181
1182AnyEvent is good for non-blocking stuff, but it can't detect file or
1183path changes (e.g. "watch this directory for new files", "watch this
1184file for changes"). The L<AnyEvent::Filesys::Notify> module promises to
1185do just that in a portbale fashion, supporting inotify on GNU/Linux and
1186some weird, without doubt broken, stuff on OS X to monitor files. It can
1187fall back to blocking scans at regular intervals transparently on other
1188platforms, so it's about as portable as it gets.
1189
1190(I haven't used it myself, but I haven't heard anybody complaining about
1191it yet).
1192
1193=item L<AnyEvent::DBI>
1194
1195Executes L<DBI> requests asynchronously in a proxy process for you,
1196notifying you in an event-based way when the operation is finished.
1197
1181=item L<AnyEvent::HTTPD> 1198=item L<AnyEvent::HTTPD>
1182 1199
1183A simple embedded webserver. 1200A simple embedded webserver.
1184 1201
1185=item L<AnyEvent::FastPing> 1202=item L<AnyEvent::FastPing>
1186 1203
1187The fastest ping in the west. 1204The fastest ping in the west.
1188 1205
1189=item L<Coro> 1206=item L<Coro>
1190 1207
1191Has special support for AnyEvent via L<Coro::AnyEvent>. 1208Has special support for AnyEvent via L<Coro::AnyEvent>, which allows you
1209to simply invert the flow control - don't call us, we will call you:
1210
1211 async {
1212 Coro::AnyEvent::sleep 5; # creates a 5s timer and waits for it
1213 print "5 seconds later!\n";
1214
1215 Coro::AnyEvent::readable *STDIN; # uses an I/O watcher
1216 my $line = <STDIN>; # works for ttys
1217
1218 AnyEvent::HTTP::http_get "url", Coro::rouse_cb;
1219 my ($body, $hdr) = Coro::rouse_wait;
1220 };
1192 1221
1193=back 1222=back
1194 1223
1195=cut 1224=cut
1196 1225
… …
1206 1235
1207BEGIN { AnyEvent::common_sense } 1236BEGIN { AnyEvent::common_sense }
1208 1237
1209use Carp (); 1238use Carp ();
1210 1239
1211our $VERSION = '6.01'; 1240our $VERSION = '6.02';
1212our $MODEL; 1241our $MODEL;
1213 1242
1214our @ISA; 1243our @ISA;
1215 1244
1216our @REGISTRY; 1245our @REGISTRY;
… …
1223 eval "sub TAINT (){" . (${^TAINT}*1) . "}"; 1252 eval "sub TAINT (){" . (${^TAINT}*1) . "}";
1224 1253
1225 delete @ENV{grep /^PERL_ANYEVENT_/, keys %ENV} 1254 delete @ENV{grep /^PERL_ANYEVENT_/, keys %ENV}
1226 if ${^TAINT}; 1255 if ${^TAINT};
1227 1256
1228 $VERBOSE = $ENV{PERL_ANYEVENT_VERBOSE}*1; 1257 $ENV{"PERL_ANYEVENT_$_"} = $ENV{"AE_$_"}
1258 for grep s/^AE_// && !exists $ENV{"PERL_ANYEVENT_$_"}, keys %ENV;
1229 1259
1260 @ENV{grep /^PERL_ANYEVENT_/, keys %ENV} = ()
1261 if ${^TAINT};
1262
1263 # $ENV{PERL_ANYEVENT_xxx} now valid
1264
1265 $VERBOSE = length $ENV{PERL_ANYEVENT_VERBOSE} ? $ENV{PERL_ANYEVENT_VERBOSE}*1 : 3;
1230} 1266}
1231 1267
1232our $MAX_SIGNAL_LATENCY = 10; 1268our $MAX_SIGNAL_LATENCY = 10;
1233 1269
1234our %PROTOCOL; # (ipv4|ipv6) => (1|2), higher numbers are preferred 1270our %PROTOCOL; # (ipv4|ipv6) => (1|2), higher numbers are preferred
… …
1270 push @POSTPONE, shift; 1306 push @POSTPONE, shift;
1271 1307
1272 $POSTPONE_W ||= AE::timer (0, 0, \&_postpone_exec); 1308 $POSTPONE_W ||= AE::timer (0, 0, \&_postpone_exec);
1273 1309
1274 () 1310 ()
1311}
1312
1313sub log($$;@) {
1314 # only load the big bloated module when we actually are about to log something
1315 if ($_[0] <= $VERBOSE) { # also catches non-numeric levels(!)
1316 require AnyEvent::Log;
1317 # AnyEvent::Log overwrites this function
1318 goto &log;
1319 }
1320
1321 0 # not logged
1322}
1323
1324if (length $ENV{PERL_ANYEVENT_LOG}) {
1325 require AnyEvent::Log; # AnyEvent::Log does the thing for us
1275} 1326}
1276 1327
1277our @models = ( 1328our @models = (
1278 [EV:: => AnyEvent::Impl::EV:: , 1], 1329 [EV:: => AnyEvent::Impl::EV:: , 1],
1279 [AnyEvent::Loop:: => AnyEvent::Impl::Perl:: , 1], 1330 [AnyEvent::Loop:: => AnyEvent::Impl::Perl:: , 1],
… …
1289 [POE::Kernel:: => AnyEvent::Impl::POE::], # lasciate ogni speranza 1340 [POE::Kernel:: => AnyEvent::Impl::POE::], # lasciate ogni speranza
1290 [Wx:: => AnyEvent::Impl::POE::], 1341 [Wx:: => AnyEvent::Impl::POE::],
1291 [Prima:: => AnyEvent::Impl::POE::], 1342 [Prima:: => AnyEvent::Impl::POE::],
1292 [IO::Async::Loop:: => AnyEvent::Impl::IOAsync::], # a bitch to autodetect 1343 [IO::Async::Loop:: => AnyEvent::Impl::IOAsync::], # a bitch to autodetect
1293 [Cocoa::EventLoop:: => AnyEvent::Impl::Cocoa::], 1344 [Cocoa::EventLoop:: => AnyEvent::Impl::Cocoa::],
1294 [FLTK:: => AnyEvent::Impl::FLTK2::], 1345 [FLTK:: => AnyEvent::Impl::FLTK::],
1295); 1346);
1296 1347
1297our @isa_hook; 1348our @isa_hook;
1298 1349
1299sub _isa_set { 1350sub _isa_set {
… …
1318# all autoloaded methods reserve the complete glob, not just the method slot. 1369# all autoloaded methods reserve the complete glob, not just the method slot.
1319# due to bugs in perls method cache implementation. 1370# due to bugs in perls method cache implementation.
1320our @methods = qw(io timer time now now_update signal child idle condvar); 1371our @methods = qw(io timer time now now_update signal child idle condvar);
1321 1372
1322sub detect() { 1373sub detect() {
1374 return $MODEL if $MODEL; # some programs keep references to detect
1375
1323 local $!; # for good measure 1376 local $!; # for good measure
1324 local $SIG{__DIE__}; # we use eval 1377 local $SIG{__DIE__}; # we use eval
1325 1378
1326 # free some memory 1379 # free some memory
1327 *detect = sub () { $MODEL }; 1380 *detect = sub () { $MODEL };
… …
1335 1388
1336 if ($ENV{PERL_ANYEVENT_MODEL} =~ /^([a-zA-Z0-9:]+)$/) { 1389 if ($ENV{PERL_ANYEVENT_MODEL} =~ /^([a-zA-Z0-9:]+)$/) {
1337 my $model = $1; 1390 my $model = $1;
1338 $model = "AnyEvent::Impl::$model" unless $model =~ s/::$//; 1391 $model = "AnyEvent::Impl::$model" unless $model =~ s/::$//;
1339 if (eval "require $model") { 1392 if (eval "require $model") {
1393 AnyEvent::log 7 => "loaded model '$model' (forced by \$ENV{PERL_ANYEVENT_MODEL}), using it.";
1340 $MODEL = $model; 1394 $MODEL = $model;
1341 warn "AnyEvent: loaded model '$model' (forced by \$ENV{PERL_ANYEVENT_MODEL}), using it.\n" if $VERBOSE >= 2;
1342 } else { 1395 } else {
1343 warn "AnyEvent: unable to load model '$model' (from \$ENV{PERL_ANYEVENT_MODEL}):\n$@" if $VERBOSE; 1396 AnyEvent::log 5 => "unable to load model '$model' (from \$ENV{PERL_ANYEVENT_MODEL}):\n$@";
1344 } 1397 }
1345 } 1398 }
1346 1399
1347 # check for already loaded models 1400 # check for already loaded models
1348 unless ($MODEL) { 1401 unless ($MODEL) {
1349 for (@REGISTRY, @models) { 1402 for (@REGISTRY, @models) {
1350 my ($package, $model) = @$_; 1403 my ($package, $model) = @$_;
1351 if (${"$package\::VERSION"} > 0) { 1404 if (${"$package\::VERSION"} > 0) {
1352 if (eval "require $model") { 1405 if (eval "require $model") {
1406 AnyEvent::log 7 => "autodetected model '$model', using it.";
1353 $MODEL = $model; 1407 $MODEL = $model;
1354 warn "AnyEvent: autodetected model '$model', using it.\n" if $VERBOSE >= 2;
1355 last; 1408 last;
1356 } 1409 }
1357 } 1410 }
1358 } 1411 }
1359 1412
… …
1365 $autoload 1418 $autoload
1366 and eval "require $package" 1419 and eval "require $package"
1367 and ${"$package\::VERSION"} > 0 1420 and ${"$package\::VERSION"} > 0
1368 and eval "require $model" 1421 and eval "require $model"
1369 ) { 1422 ) {
1423 AnyEvent::log 7 => "autoloaded model '$model', using it.";
1370 $MODEL = $model; 1424 $MODEL = $model;
1371 warn "AnyEvent: autoloaded model '$model', using it.\n" if $VERBOSE >= 2;
1372 last; 1425 last;
1373 } 1426 }
1374 } 1427 }
1375 1428
1376 $MODEL 1429 $MODEL
1377 or die "AnyEvent: backend autodetection failed - did you properly install AnyEvent?\n"; 1430 or die "AnyEvent: backend autodetection failed - did you properly install AnyEvent?";
1378 } 1431 }
1379 } 1432 }
1380 1433
1381 # free memory only needed for probing 1434 # free memory only needed for probing
1382 undef @models; 1435 undef @models;
… …
1391 if defined &{"$MODEL\::$_"}; 1444 if defined &{"$MODEL\::$_"};
1392 } 1445 }
1393 1446
1394 _isa_set; 1447 _isa_set;
1395 1448
1449 # we're officially open!
1450
1396 if ($ENV{PERL_ANYEVENT_STRICT}) { 1451 if ($ENV{PERL_ANYEVENT_STRICT}) {
1397 require AnyEvent::Strict; 1452 require AnyEvent::Strict;
1398 } 1453 }
1399 1454
1400 if ($ENV{PERL_ANYEVENT_DEBUG_WRAP}) { 1455 if ($ENV{PERL_ANYEVENT_DEBUG_WRAP}) {
1401 require AnyEvent::Debug; 1456 require AnyEvent::Debug;
1402 AnyEvent::Debug::wrap ($ENV{PERL_ANYEVENT_DEBUG_WRAP}); 1457 AnyEvent::Debug::wrap ($ENV{PERL_ANYEVENT_DEBUG_WRAP});
1403 } 1458 }
1404 1459
1405 if (exists $ENV{PERL_ANYEVENT_DEBUG_SHELL}) { 1460 if (length $ENV{PERL_ANYEVENT_DEBUG_SHELL}) {
1406 require AnyEvent::Socket; 1461 require AnyEvent::Socket;
1407 require AnyEvent::Debug; 1462 require AnyEvent::Debug;
1408 1463
1409 my $shell = $ENV{PERL_ANYEVENT_DEBUG_SHELL}; 1464 my $shell = $ENV{PERL_ANYEVENT_DEBUG_SHELL};
1410 $shell =~ s/\$\$/$$/g; 1465 $shell =~ s/\$\$/$$/g;
1411 1466
1412 my ($host, $service) = AnyEvent::Socket::parse_hostport ($shell); 1467 my ($host, $service) = AnyEvent::Socket::parse_hostport ($shell);
1413 $AnyEvent::Debug::SHELL = AnyEvent::Debug::shell ($host, $service); 1468 $AnyEvent::Debug::SHELL = AnyEvent::Debug::shell ($host, $service);
1414 } 1469 }
1470
1471 # now the anyevent environment is set up as the user told us to, so
1472 # call the actual user code - post detects
1415 1473
1416 (shift @post_detect)->() while @post_detect; 1474 (shift @post_detect)->() while @post_detect;
1417 undef @post_detect; 1475 undef @post_detect;
1418 1476
1419 *post_detect = sub(&) { 1477 *post_detect = sub(&) {
… …
1506 sub time() { 1564 sub time() {
1507 AnyEvent->time 1565 AnyEvent->time
1508 } 1566 }
1509 1567
1510 *postpone = \&AnyEvent::postpone; 1568 *postpone = \&AnyEvent::postpone;
1569 *log = \&AnyEvent::log;
1511 }; 1570 };
1512 die if $@; 1571 die if $@;
1513} 1572}
1514 1573
1515BEGIN { _reset } 1574BEGIN { _reset }
… …
1520 1579
1521sub time { 1580sub time {
1522 eval q{ # poor man's autoloading {} 1581 eval q{ # poor man's autoloading {}
1523 # probe for availability of Time::HiRes 1582 # probe for availability of Time::HiRes
1524 if (eval "use Time::HiRes (); Time::HiRes::time (); 1") { 1583 if (eval "use Time::HiRes (); Time::HiRes::time (); 1") {
1525 warn "AnyEvent: using Time::HiRes for sub-second timing accuracy.\n" if $VERBOSE >= 8;
1526 *time = sub { Time::HiRes::time () }; 1584 *time = sub { Time::HiRes::time () };
1527 *AE::time = \& Time::HiRes::time ; 1585 *AE::time = \& Time::HiRes::time ;
1586 *now = \&time;
1587 AnyEvent::log 8 => "AnyEvent: using Time::HiRes for sub-second timing accuracy.";
1528 # if (eval "use POSIX (); (POSIX::times())... 1588 # if (eval "use POSIX (); (POSIX::times())...
1529 } else { 1589 } else {
1530 warn "AnyEvent: using built-in time(), WARNING, no sub-second resolution!\n" if $VERBOSE;
1531 *time = sub { CORE::time }; 1590 *time = sub { CORE::time };
1532 *AE::time = sub (){ CORE::time }; 1591 *AE::time = sub (){ CORE::time };
1592 *now = \&time;
1593 AnyEvent::log 3 => "using built-in time(), WARNING, no sub-second resolution!";
1533 } 1594 }
1534
1535 *now = \&time;
1536 }; 1595 };
1537 die if $@; 1596 die if $@;
1538 1597
1539 &time 1598 &time
1540} 1599}
… …
1633 1692
1634sub signal { 1693sub signal {
1635 eval q{ # poor man's autoloading {} 1694 eval q{ # poor man's autoloading {}
1636 # probe for availability of Async::Interrupt 1695 # probe for availability of Async::Interrupt
1637 if (_have_async_interrupt) { 1696 if (_have_async_interrupt) {
1638 warn "AnyEvent: using Async::Interrupt for race-free signal handling.\n" if $VERBOSE >= 8; 1697 AnyEvent::log 8 => "using Async::Interrupt for race-free signal handling.";
1639 1698
1640 $SIGPIPE_R = new Async::Interrupt::EventPipe; 1699 $SIGPIPE_R = new Async::Interrupt::EventPipe;
1641 $SIG_IO = AE::io $SIGPIPE_R->fileno, 0, \&_signal_exec; 1700 $SIG_IO = AE::io $SIGPIPE_R->fileno, 0, \&_signal_exec;
1642 1701
1643 } else { 1702 } else {
1644 warn "AnyEvent: using emulated perl signal handling with latency timer.\n" if $VERBOSE >= 8; 1703 AnyEvent::log 8 => "using emulated perl signal handling with latency timer.";
1645 1704
1646 if (AnyEvent::WIN32) { 1705 if (AnyEvent::WIN32) {
1647 require AnyEvent::Util; 1706 require AnyEvent::Util;
1648 1707
1649 ($SIGPIPE_R, $SIGPIPE_W) = AnyEvent::Util::portable_pipe (); 1708 ($SIGPIPE_R, $SIGPIPE_W) = AnyEvent::Util::portable_pipe ();
… …
1943$Event/EV::DIED->() >>, L<Glib> uses C<< install_exception_handler >> and 2002$Event/EV::DIED->() >>, L<Glib> uses C<< install_exception_handler >> and
1944so on. 2003so on.
1945 2004
1946=head1 ENVIRONMENT VARIABLES 2005=head1 ENVIRONMENT VARIABLES
1947 2006
1948The following environment variables are used by this module or its 2007AnyEvent supports a number of environment variables that tune the
1949submodules. 2008runtime behaviour. They are usually evaluated when AnyEvent is
2009loaded, initialised, or a submodule that uses them is loaded. Many of
2010them also cause AnyEvent to load additional modules - for example,
2011C<PERL_ANYEVENT_DEBUG_WRAP> causes the L<AnyEvent::Debug> module to be
2012loaded.
1950 2013
1951Note that AnyEvent will remove I<all> environment variables starting with 2014All the environment variables documented here start with
1952C<PERL_ANYEVENT_> from C<%ENV> when it is loaded while taint mode is 2015C<PERL_ANYEVENT_>, which is what AnyEvent considers its own
1953enabled. 2016namespace. Other modules are encouraged (but by no means required) to use
2017C<PERL_ANYEVENT_SUBMODULE> if they have registered the AnyEvent::Submodule
2018namespace on CPAN, for any submodule. For example, L<AnyEvent::HTTP> could
2019be expected to use C<PERL_ANYEVENT_HTTP_PROXY> (it should not access env
2020variables starting with C<AE_>, see below).
2021
2022All variables can also be set via the C<AE_> prefix, that is, instead
2023of setting C<PERL_ANYEVENT_VERBOSE> you can also set C<AE_VERBOSE>. In
2024case there is a clash btween anyevent and another program that uses
2025C<AE_something> you can set the corresponding C<PERL_ANYEVENT_something>
2026variable to the empty string, as those variables take precedence.
2027
2028When AnyEvent is first loaded, it copies all C<AE_xxx> env variables
2029to their C<PERL_ANYEVENT_xxx> counterpart unless that variable already
2030exists. If taint mode is on, then AnyEvent will remove I<all> environment
2031variables starting with C<PERL_ANYEVENT_> from C<%ENV> (or replace them
2032with C<undef> or the empty string, if the corresaponding C<AE_> variable
2033is set).
2034
2035The exact algorithm is currently:
2036
2037 1. if taint mode enabled, delete all PERL_ANYEVENT_xyz variables from %ENV
2038 2. copy over AE_xyz to PERL_ANYEVENT_xyz unless the latter alraedy exists
2039 3. if taint mode enabled, set all PERL_ANYEVENT_xyz variables to undef.
2040
2041This ensures that child processes will not see the C<AE_> variables.
2042
2043The following environment variables are currently known to AnyEvent:
1954 2044
1955=over 4 2045=over 4
1956 2046
1957=item C<PERL_ANYEVENT_VERBOSE> 2047=item C<PERL_ANYEVENT_VERBOSE>
1958 2048
1959By default, AnyEvent will be completely silent except in fatal 2049By default, AnyEvent will only log messages with loglevel C<3>
1960conditions. You can set this environment variable to make AnyEvent more 2050(C<critical>) or higher (see L<AnyEvent::Log>). You can set this
2051environment variable to a numerical loglevel to make AnyEvent more (or
1961talkative. 2052less) talkative.
1962 2053
2054If you want to do more than just set the global logging level
2055you should have a look at C<PERL_ANYEVENT_LOG>, which allows much more
2056complex specifications.
2057
2058When set to C<0> (C<off>), then no messages whatsoever will be logged with
2059the default logging settings.
2060
1963When set to C<1> or higher, causes AnyEvent to warn about unexpected 2061When set to C<5> or higher (C<warn>), causes AnyEvent to warn about
1964conditions, such as not being able to load the event model specified by 2062unexpected conditions, such as not being able to load the event model
1965C<PERL_ANYEVENT_MODEL>. 2063specified by C<PERL_ANYEVENT_MODEL>, or a guard callback throwing an
2064exception - this is the minimum recommended level.
1966 2065
1967When set to C<2> or higher, cause AnyEvent to report to STDERR which event 2066When set to C<7> or higher (info), cause AnyEvent to report which event model it
1968model it chooses. 2067chooses.
1969 2068
1970When set to C<8> or higher, then AnyEvent will report extra information on 2069When set to C<8> or higher (debug), then AnyEvent will report extra information on
1971which optional modules it loads and how it implements certain features. 2070which optional modules it loads and how it implements certain features.
2071
2072=item C<PERL_ANYEVENT_LOG>
2073
2074Accepts rather complex logging specifications. For example, you could log
2075all C<debug> messages of some module to stderr, warnings and above to
2076stderr, and errors and above to syslog, with:
2077
2078 PERL_ANYEVENT_LOG=Some::Module=debug,+log:filter=warn,+%syslog:%syslog=error,syslog
2079
2080For the rather extensive details, see L<AnyEvent::Log>.
2081
2082This variable is evaluated when AnyEvent (or L<AnyEvent::Log>) is loaded,
2083so will take effect even before AnyEvent has initialised itself.
2084
2085Note that specifying this environment variable causes the L<AnyEvent::Log>
2086module to be loaded, while C<PERL_ANYEVENT_VERBOSE> does not, so only
2087using the latter saves a few hundred kB of memory until the first message
2088is being logged.
1972 2089
1973=item C<PERL_ANYEVENT_STRICT> 2090=item C<PERL_ANYEVENT_STRICT>
1974 2091
1975AnyEvent does not do much argument checking by default, as thorough 2092AnyEvent does not do much argument checking by default, as thorough
1976argument checking is very costly. Setting this variable to a true value 2093argument checking is very costly. Setting this variable to a true value
… …
1990If this env variable is set, then its contents will be interpreted by 2107If this env variable is set, then its contents will be interpreted by
1991C<AnyEvent::Socket::parse_hostport> (after replacing every occurance of 2108C<AnyEvent::Socket::parse_hostport> (after replacing every occurance of
1992C<$$> by the process pid) and an C<AnyEvent::Debug::shell> is bound on 2109C<$$> by the process pid) and an C<AnyEvent::Debug::shell> is bound on
1993that port. The shell object is saved in C<$AnyEvent::Debug::SHELL>. 2110that port. The shell object is saved in C<$AnyEvent::Debug::SHELL>.
1994 2111
1995This takes place when the first watcher is created. 2112This happens when the first watcher is created.
1996 2113
1997For example, to bind a debug shell on a unix domain socket in 2114For example, to bind a debug shell on a unix domain socket in
1998F<< /tmp/debug<pid>.sock >>, you could use this: 2115F<< /tmp/debug<pid>.sock >>, you could use this:
1999 2116
2000 PERL_ANYEVENT_DEBUG_SHELL=unix/:/tmp/debug\$\$.sock perlprog 2117 PERL_ANYEVENT_DEBUG_SHELL=/tmp/debug\$\$.sock perlprog
2001 2118
2002Note that creating sockets in F</tmp> is very unsafe on multiuser 2119Note that creating sockets in F</tmp> is very unsafe on multiuser
2003systems. 2120systems.
2004 2121
2005=item C<PERL_ANYEVENT_DEBUG_WRAP> 2122=item C<PERL_ANYEVENT_DEBUG_WRAP>
… …
2046but support both and try to use both. C<PERL_ANYEVENT_PROTOCOLS=ipv4> 2163but support both and try to use both. C<PERL_ANYEVENT_PROTOCOLS=ipv4>
2047- only support IPv4, never try to resolve or contact IPv6 2164- only support IPv4, never try to resolve or contact IPv6
2048addresses. C<PERL_ANYEVENT_PROTOCOLS=ipv6,ipv4> support either IPv4 or 2165addresses. C<PERL_ANYEVENT_PROTOCOLS=ipv6,ipv4> support either IPv4 or
2049IPv6, but prefer IPv6 over IPv4. 2166IPv6, but prefer IPv6 over IPv4.
2050 2167
2168=item C<PERL_ANYEVENT_HOSTS>
2169
2170This variable, if specified, overrides the F</etc/hosts> file used by
2171L<AnyEvent::Socket>C<::resolve_sockaddr>, i.e. hosts aliases will be read
2172from that file instead.
2173
2051=item C<PERL_ANYEVENT_EDNS0> 2174=item C<PERL_ANYEVENT_EDNS0>
2052 2175
2053Used by L<AnyEvent::DNS> to decide whether to use the EDNS0 extension 2176Used by L<AnyEvent::DNS> to decide whether to use the EDNS0 extension for
2054for DNS. This extension is generally useful to reduce DNS traffic, but 2177DNS. This extension is generally useful to reduce DNS traffic, especially
2055some (broken) firewalls drop such DNS packets, which is why it is off by 2178when DNSSEC is involved, but some (broken) firewalls drop such DNS
2056default. 2179packets, which is why it is off by default.
2057 2180
2058Setting this variable to C<1> will cause L<AnyEvent::DNS> to announce 2181Setting this variable to C<1> will cause L<AnyEvent::DNS> to announce
2059EDNS0 in its DNS requests. 2182EDNS0 in its DNS requests.
2060 2183
2061=item C<PERL_ANYEVENT_MAX_FORKS> 2184=item C<PERL_ANYEVENT_MAX_FORKS>
… …
2069resolver - this is the maximum number of parallel DNS requests that are 2192resolver - this is the maximum number of parallel DNS requests that are
2070sent to the DNS server. 2193sent to the DNS server.
2071 2194
2072=item C<PERL_ANYEVENT_RESOLV_CONF> 2195=item C<PERL_ANYEVENT_RESOLV_CONF>
2073 2196
2074The file to use instead of F</etc/resolv.conf> (or OS-specific 2197The absolute path to a F<resolv.conf>-style file to use instead of
2075configuration) in the default resolver. When set to the empty string, no 2198F</etc/resolv.conf> (or the OS-specific configuration) in the default
2076default config will be used. 2199resolver, or the empty string to select the default configuration.
2077 2200
2078=item C<PERL_ANYEVENT_CA_FILE>, C<PERL_ANYEVENT_CA_PATH>. 2201=item C<PERL_ANYEVENT_CA_FILE>, C<PERL_ANYEVENT_CA_PATH>.
2079 2202
2080When neither C<ca_file> nor C<ca_path> was specified during 2203When neither C<ca_file> nor C<ca_path> was specified during
2081L<AnyEvent::TLS> context creation, and either of these environment 2204L<AnyEvent::TLS> context creation, and either of these environment
2082variables exist, they will be used to specify CA certificate locations 2205variables are nonempty, they will be used to specify CA certificate
2083instead of a system-dependent default. 2206locations instead of a system-dependent default.
2084 2207
2085=item C<PERL_ANYEVENT_AVOID_GUARD> and C<PERL_ANYEVENT_AVOID_ASYNC_INTERRUPT> 2208=item C<PERL_ANYEVENT_AVOID_GUARD> and C<PERL_ANYEVENT_AVOID_ASYNC_INTERRUPT>
2086 2209
2087When these are set to C<1>, then the respective modules are not 2210When these are set to C<1>, then the respective modules are not
2088loaded. Mostly good for testing AnyEvent itself. 2211loaded. Mostly good for testing AnyEvent itself.
… …
2805 2928
2806Tutorial/Introduction: L<AnyEvent::Intro>. 2929Tutorial/Introduction: L<AnyEvent::Intro>.
2807 2930
2808FAQ: L<AnyEvent::FAQ>. 2931FAQ: L<AnyEvent::FAQ>.
2809 2932
2810Utility functions: L<AnyEvent::Util>. 2933Utility functions: L<AnyEvent::Util> (misc. grab-bag), L<AnyEvent::Log>
2934(simply logging).
2811 2935
2936Development/Debugging: L<AnyEvent::Strict> (stricter checking),
2937L<AnyEvent::Debug> (interactive shell, watcher tracing).
2938
2812Event modules: L<AnyEvent::Loop>, L<EV>, L<EV::Glib>, L<Glib::EV>, 2939Supported event modules: L<AnyEvent::Loop>, L<EV>, L<EV::Glib>,
2813L<Event>, L<Glib::Event>, L<Glib>, L<Tk>, L<Event::Lib>, L<Qt>, L<POE>. 2940L<Glib::EV>, L<Event>, L<Glib::Event>, L<Glib>, L<Tk>, L<Event::Lib>,
2941L<Qt>, L<POE>, L<FLTK>.
2814 2942
2815Implementations: L<AnyEvent::Impl::EV>, L<AnyEvent::Impl::Event>, 2943Implementations: L<AnyEvent::Impl::EV>, L<AnyEvent::Impl::Event>,
2816L<AnyEvent::Impl::Glib>, L<AnyEvent::Impl::Tk>, L<AnyEvent::Impl::Perl>, 2944L<AnyEvent::Impl::Glib>, L<AnyEvent::Impl::Tk>, L<AnyEvent::Impl::Perl>,
2817L<AnyEvent::Impl::EventLib>, L<AnyEvent::Impl::Qt>, 2945L<AnyEvent::Impl::EventLib>, L<AnyEvent::Impl::Qt>,
2818L<AnyEvent::Impl::POE>, L<AnyEvent::Impl::IOAsync>, L<Anyevent::Impl::Irssi>. 2946L<AnyEvent::Impl::POE>, L<AnyEvent::Impl::IOAsync>, L<Anyevent::Impl::Irssi>,
2947L<AnyEvent::Impl::FLTK>.
2819 2948
2820Non-blocking file handles, sockets, TCP clients and 2949Non-blocking handles, pipes, stream sockets, TCP clients and
2821servers: L<AnyEvent::Handle>, L<AnyEvent::Socket>, L<AnyEvent::TLS>. 2950servers: L<AnyEvent::Handle>, L<AnyEvent::Socket>, L<AnyEvent::TLS>.
2822 2951
2823Asynchronous DNS: L<AnyEvent::DNS>. 2952Asynchronous DNS: L<AnyEvent::DNS>.
2824 2953
2825Thread support: L<Coro>, L<Coro::AnyEvent>, L<Coro::EV>, L<Coro::Event>. 2954Thread support: L<Coro>, L<Coro::AnyEvent>, L<Coro::EV>, L<Coro::Event>.

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