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Comparing AnyEvent/lib/AnyEvent.pm (file contents):
Revision 1.368 by root, Wed Aug 17 02:30:38 2011 UTC vs.
Revision 1.382 by root, Thu Sep 1 23:46:26 2011 UTC

… …
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
… …
1053 1053
1054=item AnyEvent::log $level, $msg[, @args] 1054=item AnyEvent::log $level, $msg[, @args]
1055 1055
1056Log the given C<$msg> at the given C<$level>. 1056Log the given C<$msg> at the given C<$level>.
1057 1057
1058Loads AnyEvent::Log on first use and calls C<AnyEvent::Log::log> - 1058If L<AnyEvent::Log> is not loaded then this function makes a simple test
1059to see whether the message will be logged. If the test succeeds it will
1060load AnyEvent::Log and call C<AnyEvent::Log::log> - consequently, look at
1059consequently, look at the L<AnyEvent::Log> documentation for details. 1061the L<AnyEvent::Log> documentation for details.
1062
1063If the test fails it will simply return. Right now this happens when a
1064numerical loglevel is used and it is larger than the level specified via
1065C<$ENV{PERL_ANYEVENT_VERBOSE}>.
1060 1066
1061If you want to sprinkle loads of logging calls around your code, consider 1067If you want to sprinkle loads of logging calls around your code, consider
1062creating a logger callback with the C<AnyEvent::Log::logger< function. 1068creating a logger callback with the C<AnyEvent::Log::logger> function,
1069which can reduce typing, codesize and can reduce the logging overhead
1070enourmously.
1063 1071
1064=back 1072=back
1065 1073
1066=head1 WHAT TO DO IN A MODULE 1074=head1 WHAT TO DO IN A MODULE
1067 1075
… …
1127 1135
1128The following is a non-exhaustive list of additional modules that use 1136The following is a non-exhaustive list of additional modules that use
1129AnyEvent as a client and can therefore be mixed easily with other 1137AnyEvent as a client and can therefore be mixed easily with other
1130AnyEvent modules and other event loops in the same program. Some of the 1138AnyEvent modules and other event loops in the same program. Some of the
1131modules come as part of AnyEvent, the others are available via CPAN (see 1139modules come as part of AnyEvent, the others are available via CPAN (see
1132L<http://search.cpan.org/search?m=module&q=anyevent%3A%3A*1> for 1140L<http://search.cpan.org/search?m=module&q=anyevent%3A%3A*> for
1133a longer non-exhaustive list), and the list is heavily biased towards 1141a longer non-exhaustive list), and the list is heavily biased towards
1134modules of the AnyEvent author himself :) 1142modules of the AnyEvent author himself :)
1135 1143
1136=over 4 1144=over 4
1137 1145
… …
1159=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>
1160 1168
1161Implement event-based interfaces to the protocols of the same name (for 1169Implement event-based interfaces to the protocols of the same name (for
1162the 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
1163Client Protocol). 1171Client Protocol).
1164
1165=item L<AnyEvent::Handle::UDP>
1166
1167Here be danger!
1168
1169As Pauli would put it, "Not only is it not right, it's not even wrong!" -
1170there are so many things wrong with AnyEvent::Handle::UDP, most notably
1171its use of a stream-based API with a protocol that isn't streamable, that
1172the only way to improve it is to delete it.
1173
1174It features data corruption (but typically only under load) and general
1175confusion. On top, the author is not only clueless about UDP but also
1176fact-resistant - some gems of his understanding: "connect doesn't work
1177with UDP", "UDP packets are not IP packets", "UDP only has datagrams, not
1178packets", "I don't need to implement proper error checking as UDP doesn't
1179support error checking" and so on - he doesn't even understand what's
1180wrong with his module when it is explained to him.
1181
1182=item L<AnyEvent::DBI>
1183
1184Executes L<DBI> requests asynchronously in a proxy process for you,
1185notifying you in an event-based way when the operation is finished.
1186 1172
1187=item L<AnyEvent::AIO> 1173=item L<AnyEvent::AIO>
1188 1174
1189Truly 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
1190toolbox of every event programmer. AnyEvent::AIO transparently fuses 1176toolbox of every event programmer. AnyEvent::AIO transparently fuses
1191L<IO::AIO> and AnyEvent together, giving AnyEvent access to event-based 1177L<IO::AIO> and AnyEvent together, giving AnyEvent access to event-based
1192file I/O, and much more. 1178file I/O, and much more.
1193 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
1194=item L<AnyEvent::HTTPD> 1198=item L<AnyEvent::HTTPD>
1195 1199
1196A simple embedded webserver. 1200A simple embedded webserver.
1197 1201
1198=item L<AnyEvent::FastPing> 1202=item L<AnyEvent::FastPing>
1199 1203
1200The fastest ping in the west. 1204The fastest ping in the west.
1201 1205
1202=item L<Coro> 1206=item L<Coro>
1203 1207
1204Has 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 };
1205 1221
1206=back 1222=back
1207 1223
1208=cut 1224=cut
1209 1225
… …
1219 1235
1220BEGIN { AnyEvent::common_sense } 1236BEGIN { AnyEvent::common_sense }
1221 1237
1222use Carp (); 1238use Carp ();
1223 1239
1224our $VERSION = '6.01'; 1240our $VERSION = '6.02';
1225our $MODEL; 1241our $MODEL;
1226
1227our @ISA; 1242our @ISA;
1228
1229our @REGISTRY; 1243our @REGISTRY;
1230
1231our $VERBOSE; 1244our $VERBOSE;
1245our $MAX_SIGNAL_LATENCY = 10;
1246our %PROTOCOL; # (ipv4|ipv6) => (1|2), higher numbers are preferred
1232 1247
1233BEGIN { 1248BEGIN {
1234 require "AnyEvent/constants.pl"; 1249 require "AnyEvent/constants.pl";
1235 1250
1236 eval "sub TAINT (){" . (${^TAINT}*1) . "}"; 1251 eval "sub TAINT (){" . (${^TAINT}*1) . "}";
1237 1252
1238 delete @ENV{grep /^PERL_ANYEVENT_/, keys %ENV} 1253 delete @ENV{grep /^PERL_ANYEVENT_/, keys %ENV}
1239 if ${^TAINT}; 1254 if ${^TAINT};
1240 1255
1241 $VERBOSE = $ENV{PERL_ANYEVENT_VERBOSE}*1; 1256 $ENV{"PERL_ANYEVENT_$_"} = $ENV{"AE_$_"}
1242} 1257 for grep s/^AE_// && !exists $ENV{"PERL_ANYEVENT_$_"}, keys %ENV;
1243 1258
1244our $MAX_SIGNAL_LATENCY = 10; 1259 @ENV{grep /^PERL_ANYEVENT_/, keys %ENV} = ()
1260 if ${^TAINT};
1245 1261
1246our %PROTOCOL; # (ipv4|ipv6) => (1|2), higher numbers are preferred 1262 # $ENV{PERL_ANYEVENT_xxx} now valid
1247 1263
1248{ 1264 $VERBOSE = length $ENV{PERL_ANYEVENT_VERBOSE} ? $ENV{PERL_ANYEVENT_VERBOSE}*1 : 3;
1265
1249 my $idx; 1266 my $idx;
1250 $PROTOCOL{$_} = ++$idx 1267 $PROTOCOL{$_} = ++$idx
1251 for reverse split /\s*,\s*/, 1268 for reverse split /\s*,\s*/,
1252 $ENV{PERL_ANYEVENT_PROTOCOLS} || "ipv4,ipv6"; 1269 $ENV{PERL_ANYEVENT_PROTOCOLS} || "ipv4,ipv6";
1253} 1270}
… …
1285 1302
1286 () 1303 ()
1287} 1304}
1288 1305
1289sub log($$;@) { 1306sub log($$;@) {
1307 # only load the big bloated module when we actually are about to log something
1308 if ($_[0] <= $VERBOSE) { # also catches non-numeric levels(!)
1290 require AnyEvent::Log; 1309 require AnyEvent::Log;
1291 # AnyEvent::Log overwrites this function 1310 # AnyEvent::Log overwrites this function
1292 goto &log; 1311 goto &log;
1312 }
1313
1314 0 # not logged
1315}
1316
1317if (length $ENV{PERL_ANYEVENT_LOG}) {
1318 require AnyEvent::Log; # AnyEvent::Log does the thing for us
1293} 1319}
1294 1320
1295our @models = ( 1321our @models = (
1296 [EV:: => AnyEvent::Impl::EV:: , 1], 1322 [EV:: => AnyEvent::Impl::EV:: , 1],
1297 [AnyEvent::Loop:: => AnyEvent::Impl::Perl:: , 1], 1323 [AnyEvent::Loop:: => AnyEvent::Impl::Perl:: , 1],
… …
1307 [POE::Kernel:: => AnyEvent::Impl::POE::], # lasciate ogni speranza 1333 [POE::Kernel:: => AnyEvent::Impl::POE::], # lasciate ogni speranza
1308 [Wx:: => AnyEvent::Impl::POE::], 1334 [Wx:: => AnyEvent::Impl::POE::],
1309 [Prima:: => AnyEvent::Impl::POE::], 1335 [Prima:: => AnyEvent::Impl::POE::],
1310 [IO::Async::Loop:: => AnyEvent::Impl::IOAsync::], # a bitch to autodetect 1336 [IO::Async::Loop:: => AnyEvent::Impl::IOAsync::], # a bitch to autodetect
1311 [Cocoa::EventLoop:: => AnyEvent::Impl::Cocoa::], 1337 [Cocoa::EventLoop:: => AnyEvent::Impl::Cocoa::],
1312 [FLTK:: => AnyEvent::Impl::FLTK2::], 1338 [FLTK:: => AnyEvent::Impl::FLTK::],
1313); 1339);
1314 1340
1315our @isa_hook; 1341our @isa_hook;
1316 1342
1317sub _isa_set { 1343sub _isa_set {
… …
1355 1381
1356 if ($ENV{PERL_ANYEVENT_MODEL} =~ /^([a-zA-Z0-9:]+)$/) { 1382 if ($ENV{PERL_ANYEVENT_MODEL} =~ /^([a-zA-Z0-9:]+)$/) {
1357 my $model = $1; 1383 my $model = $1;
1358 $model = "AnyEvent::Impl::$model" unless $model =~ s/::$//; 1384 $model = "AnyEvent::Impl::$model" unless $model =~ s/::$//;
1359 if (eval "require $model") { 1385 if (eval "require $model") {
1386 AnyEvent::log 7 => "loaded model '$model' (forced by \$ENV{PERL_ANYEVENT_MODEL}), using it.";
1360 $MODEL = $model; 1387 $MODEL = $model;
1361 AnyEvent::log 7 => "loaded model '$model' (forced by \$ENV{PERL_ANYEVENT_MODEL}), using it."
1362 if $VERBOSE >= 7;
1363 } else { 1388 } else {
1364 AnyEvent::log warn => "unable to load model '$model' (from \$ENV{PERL_ANYEVENT_MODEL}):\n$@"; 1389 AnyEvent::log 5 => "unable to load model '$model' (from \$ENV{PERL_ANYEVENT_MODEL}):\n$@";
1365 } 1390 }
1366 } 1391 }
1367 1392
1368 # check for already loaded models 1393 # check for already loaded models
1369 unless ($MODEL) { 1394 unless ($MODEL) {
1370 for (@REGISTRY, @models) { 1395 for (@REGISTRY, @models) {
1371 my ($package, $model) = @$_; 1396 my ($package, $model) = @$_;
1372 if (${"$package\::VERSION"} > 0) { 1397 if (${"$package\::VERSION"} > 0) {
1373 if (eval "require $model") { 1398 if (eval "require $model") {
1399 AnyEvent::log 7 => "autodetected model '$model', using it.";
1374 $MODEL = $model; 1400 $MODEL = $model;
1375 AnyEvent::log 7 => "autodetected model '$model', using it."
1376 if $VERBOSE >= 7;
1377 last; 1401 last;
1378 } 1402 }
1379 } 1403 }
1380 } 1404 }
1381 1405
… …
1387 $autoload 1411 $autoload
1388 and eval "require $package" 1412 and eval "require $package"
1389 and ${"$package\::VERSION"} > 0 1413 and ${"$package\::VERSION"} > 0
1390 and eval "require $model" 1414 and eval "require $model"
1391 ) { 1415 ) {
1416 AnyEvent::log 7 => "autoloaded model '$model', using it.";
1392 $MODEL = $model; 1417 $MODEL = $model;
1393 AnyEvent::log 7 => "autoloaded model '$model', using it."
1394 if $VERBOSE >= 7;
1395 last; 1418 last;
1396 } 1419 }
1397 } 1420 }
1398 1421
1399 $MODEL 1422 $MODEL
… …
1549 1572
1550sub time { 1573sub time {
1551 eval q{ # poor man's autoloading {} 1574 eval q{ # poor man's autoloading {}
1552 # probe for availability of Time::HiRes 1575 # probe for availability of Time::HiRes
1553 if (eval "use Time::HiRes (); Time::HiRes::time (); 1") { 1576 if (eval "use Time::HiRes (); Time::HiRes::time (); 1") {
1554 AnyEvent::log 8 => "AnyEvent: using Time::HiRes for sub-second timing accuracy."
1555 if $AnyEvent::VERBOSE >= 8;
1556 *time = sub { Time::HiRes::time () }; 1577 *time = sub { Time::HiRes::time () };
1557 *AE::time = \& Time::HiRes::time ; 1578 *AE::time = \& Time::HiRes::time ;
1579 *now = \&time;
1580 AnyEvent::log 8 => "AnyEvent: using Time::HiRes for sub-second timing accuracy.";
1558 # if (eval "use POSIX (); (POSIX::times())... 1581 # if (eval "use POSIX (); (POSIX::times())...
1559 } else { 1582 } else {
1560 AnyEvent::log critical => "using built-in time(), WARNING, no sub-second resolution!";
1561 *time = sub { CORE::time }; 1583 *time = sub { CORE::time };
1562 *AE::time = sub (){ CORE::time }; 1584 *AE::time = sub (){ CORE::time };
1585 *now = \&time;
1586 AnyEvent::log 3 => "using built-in time(), WARNING, no sub-second resolution!";
1563 } 1587 }
1564
1565 *now = \&time;
1566 }; 1588 };
1567 die if $@; 1589 die if $@;
1568 1590
1569 &time 1591 &time
1570} 1592}
… …
1663 1685
1664sub signal { 1686sub signal {
1665 eval q{ # poor man's autoloading {} 1687 eval q{ # poor man's autoloading {}
1666 # probe for availability of Async::Interrupt 1688 # probe for availability of Async::Interrupt
1667 if (_have_async_interrupt) { 1689 if (_have_async_interrupt) {
1668 AnyEvent::log 8 => "using Async::Interrupt for race-free signal handling." 1690 AnyEvent::log 8 => "using Async::Interrupt for race-free signal handling.";
1669 if $AnyEvent::VERBOSE >= 8;
1670 1691
1671 $SIGPIPE_R = new Async::Interrupt::EventPipe; 1692 $SIGPIPE_R = new Async::Interrupt::EventPipe;
1672 $SIG_IO = AE::io $SIGPIPE_R->fileno, 0, \&_signal_exec; 1693 $SIG_IO = AE::io $SIGPIPE_R->fileno, 0, \&_signal_exec;
1673 1694
1674 } else { 1695 } else {
1675 AnyEvent::log 8 => "using emulated perl signal handling with latency timer." 1696 AnyEvent::log 8 => "using emulated perl signal handling with latency timer.";
1676 if $AnyEvent::VERBOSE >= 8;
1677 1697
1678 if (AnyEvent::WIN32) { 1698 if (AnyEvent::WIN32) {
1679 require AnyEvent::Util; 1699 require AnyEvent::Util;
1680 1700
1681 ($SIGPIPE_R, $SIGPIPE_W) = AnyEvent::Util::portable_pipe (); 1701 ($SIGPIPE_R, $SIGPIPE_W) = AnyEvent::Util::portable_pipe ();
… …
1975$Event/EV::DIED->() >>, L<Glib> uses C<< install_exception_handler >> and 1995$Event/EV::DIED->() >>, L<Glib> uses C<< install_exception_handler >> and
1976so on. 1996so on.
1977 1997
1978=head1 ENVIRONMENT VARIABLES 1998=head1 ENVIRONMENT VARIABLES
1979 1999
1980The following environment variables are used by this module or its 2000AnyEvent supports a number of environment variables that tune the
1981submodules. 2001runtime behaviour. They are usually evaluated when AnyEvent is
2002loaded, initialised, or a submodule that uses them is loaded. Many of
2003them also cause AnyEvent to load additional modules - for example,
2004C<PERL_ANYEVENT_DEBUG_WRAP> causes the L<AnyEvent::Debug> module to be
2005loaded.
1982 2006
1983Note that AnyEvent will remove I<all> environment variables starting with 2007All the environment variables documented here start with
1984C<PERL_ANYEVENT_> from C<%ENV> when it is loaded while taint mode is 2008C<PERL_ANYEVENT_>, which is what AnyEvent considers its own
1985enabled. 2009namespace. Other modules are encouraged (but by no means required) to use
2010C<PERL_ANYEVENT_SUBMODULE> if they have registered the AnyEvent::Submodule
2011namespace on CPAN, for any submodule. For example, L<AnyEvent::HTTP> could
2012be expected to use C<PERL_ANYEVENT_HTTP_PROXY> (it should not access env
2013variables starting with C<AE_>, see below).
2014
2015All variables can also be set via the C<AE_> prefix, that is, instead
2016of setting C<PERL_ANYEVENT_VERBOSE> you can also set C<AE_VERBOSE>. In
2017case there is a clash btween anyevent and another program that uses
2018C<AE_something> you can set the corresponding C<PERL_ANYEVENT_something>
2019variable to the empty string, as those variables take precedence.
2020
2021When AnyEvent is first loaded, it copies all C<AE_xxx> env variables
2022to their C<PERL_ANYEVENT_xxx> counterpart unless that variable already
2023exists. If taint mode is on, then AnyEvent will remove I<all> environment
2024variables starting with C<PERL_ANYEVENT_> from C<%ENV> (or replace them
2025with C<undef> or the empty string, if the corresaponding C<AE_> variable
2026is set).
2027
2028The exact algorithm is currently:
2029
2030 1. if taint mode enabled, delete all PERL_ANYEVENT_xyz variables from %ENV
2031 2. copy over AE_xyz to PERL_ANYEVENT_xyz unless the latter alraedy exists
2032 3. if taint mode enabled, set all PERL_ANYEVENT_xyz variables to undef.
2033
2034This ensures that child processes will not see the C<AE_> variables.
2035
2036The following environment variables are currently known to AnyEvent:
1986 2037
1987=over 4 2038=over 4
1988 2039
1989=item C<PERL_ANYEVENT_VERBOSE> 2040=item C<PERL_ANYEVENT_VERBOSE>
1990 2041
1991By default, AnyEvent will be completely silent except in fatal 2042By default, AnyEvent will only log messages with loglevel C<3>
1992conditions. You can set this environment variable to make AnyEvent more 2043(C<critical>) or higher (see L<AnyEvent::Log>). You can set this
2044environment variable to a numerical loglevel to make AnyEvent more (or
1993talkative. 2045less) talkative.
1994 2046
2047If you want to do more than just set the global logging level
2048you should have a look at C<PERL_ANYEVENT_LOG>, which allows much more
2049complex specifications.
2050
2051When set to C<0> (C<off>), then no messages whatsoever will be logged with
2052the default logging settings.
2053
1995When set to C<5> or higher, causes AnyEvent to warn about unexpected 2054When set to C<5> or higher (C<warn>), causes AnyEvent to warn about
1996conditions, such as not being able to load the event model specified by 2055unexpected conditions, such as not being able to load the event model
1997C<PERL_ANYEVENT_MODEL>. 2056specified by C<PERL_ANYEVENT_MODEL>, or a guard callback throwing an
2057exception - this is the minimum recommended level.
1998 2058
1999When set to C<7> or higher, cause AnyEvent to report to STDERR which event 2059When set to C<7> or higher (info), cause AnyEvent to report which event model it
2000model it chooses. 2060chooses.
2001 2061
2002When set to C<8> or higher, then AnyEvent will report extra information on 2062When set to C<8> or higher (debug), then AnyEvent will report extra information on
2003which optional modules it loads and how it implements certain features. 2063which optional modules it loads and how it implements certain features.
2064
2065=item C<PERL_ANYEVENT_LOG>
2066
2067Accepts rather complex logging specifications. For example, you could log
2068all C<debug> messages of some module to stderr, warnings and above to
2069stderr, and errors and above to syslog, with:
2070
2071 PERL_ANYEVENT_LOG=Some::Module=debug,+log:filter=warn,+%syslog:%syslog=error,syslog
2072
2073For the rather extensive details, see L<AnyEvent::Log>.
2074
2075This variable is evaluated when AnyEvent (or L<AnyEvent::Log>) is loaded,
2076so will take effect even before AnyEvent has initialised itself.
2077
2078Note that specifying this environment variable causes the L<AnyEvent::Log>
2079module to be loaded, while C<PERL_ANYEVENT_VERBOSE> does not, so only
2080using the latter saves a few hundred kB of memory until the first message
2081is being logged.
2004 2082
2005=item C<PERL_ANYEVENT_STRICT> 2083=item C<PERL_ANYEVENT_STRICT>
2006 2084
2007AnyEvent does not do much argument checking by default, as thorough 2085AnyEvent does not do much argument checking by default, as thorough
2008argument checking is very costly. Setting this variable to a true value 2086argument checking is very costly. Setting this variable to a true value
… …
2022If this env variable is set, then its contents will be interpreted by 2100If this env variable is set, then its contents will be interpreted by
2023C<AnyEvent::Socket::parse_hostport> (after replacing every occurance of 2101C<AnyEvent::Socket::parse_hostport> (after replacing every occurance of
2024C<$$> by the process pid) and an C<AnyEvent::Debug::shell> is bound on 2102C<$$> by the process pid) and an C<AnyEvent::Debug::shell> is bound on
2025that port. The shell object is saved in C<$AnyEvent::Debug::SHELL>. 2103that port. The shell object is saved in C<$AnyEvent::Debug::SHELL>.
2026 2104
2027This takes place when the first watcher is created. 2105This happens when the first watcher is created.
2028 2106
2029For example, to bind a debug shell on a unix domain socket in 2107For example, to bind a debug shell on a unix domain socket in
2030F<< /tmp/debug<pid>.sock >>, you could use this: 2108F<< /tmp/debug<pid>.sock >>, you could use this:
2031 2109
2032 PERL_ANYEVENT_DEBUG_SHELL=/tmp/debug\$\$.sock perlprog 2110 PERL_ANYEVENT_DEBUG_SHELL=/tmp/debug\$\$.sock perlprog
… …
2078but support both and try to use both. C<PERL_ANYEVENT_PROTOCOLS=ipv4> 2156but support both and try to use both. C<PERL_ANYEVENT_PROTOCOLS=ipv4>
2079- only support IPv4, never try to resolve or contact IPv6 2157- only support IPv4, never try to resolve or contact IPv6
2080addresses. C<PERL_ANYEVENT_PROTOCOLS=ipv6,ipv4> support either IPv4 or 2158addresses. C<PERL_ANYEVENT_PROTOCOLS=ipv6,ipv4> support either IPv4 or
2081IPv6, but prefer IPv6 over IPv4. 2159IPv6, but prefer IPv6 over IPv4.
2082 2160
2161=item C<PERL_ANYEVENT_HOSTS>
2162
2163This variable, if specified, overrides the F</etc/hosts> file used by
2164L<AnyEvent::Socket>C<::resolve_sockaddr>, i.e. hosts aliases will be read
2165from that file instead.
2166
2083=item C<PERL_ANYEVENT_EDNS0> 2167=item C<PERL_ANYEVENT_EDNS0>
2084 2168
2085Used by L<AnyEvent::DNS> to decide whether to use the EDNS0 extension 2169Used by L<AnyEvent::DNS> to decide whether to use the EDNS0 extension for
2086for DNS. This extension is generally useful to reduce DNS traffic, but 2170DNS. This extension is generally useful to reduce DNS traffic, especially
2087some (broken) firewalls drop such DNS packets, which is why it is off by 2171when DNSSEC is involved, but some (broken) firewalls drop such DNS
2088default. 2172packets, which is why it is off by default.
2089 2173
2090Setting this variable to C<1> will cause L<AnyEvent::DNS> to announce 2174Setting this variable to C<1> will cause L<AnyEvent::DNS> to announce
2091EDNS0 in its DNS requests. 2175EDNS0 in its DNS requests.
2092 2176
2093=item C<PERL_ANYEVENT_MAX_FORKS> 2177=item C<PERL_ANYEVENT_MAX_FORKS>
… …
2101resolver - this is the maximum number of parallel DNS requests that are 2185resolver - this is the maximum number of parallel DNS requests that are
2102sent to the DNS server. 2186sent to the DNS server.
2103 2187
2104=item C<PERL_ANYEVENT_RESOLV_CONF> 2188=item C<PERL_ANYEVENT_RESOLV_CONF>
2105 2189
2106The file to use instead of F</etc/resolv.conf> (or OS-specific 2190The absolute path to a F<resolv.conf>-style file to use instead of
2107configuration) in the default resolver. When set to the empty string, no 2191F</etc/resolv.conf> (or the OS-specific configuration) in the default
2108default config will be used. 2192resolver, or the empty string to select the default configuration.
2109 2193
2110=item C<PERL_ANYEVENT_CA_FILE>, C<PERL_ANYEVENT_CA_PATH>. 2194=item C<PERL_ANYEVENT_CA_FILE>, C<PERL_ANYEVENT_CA_PATH>.
2111 2195
2112When neither C<ca_file> nor C<ca_path> was specified during 2196When neither C<ca_file> nor C<ca_path> was specified during
2113L<AnyEvent::TLS> context creation, and either of these environment 2197L<AnyEvent::TLS> context creation, and either of these environment
2114variables exist, they will be used to specify CA certificate locations 2198variables are nonempty, they will be used to specify CA certificate
2115instead of a system-dependent default. 2199locations instead of a system-dependent default.
2116 2200
2117=item C<PERL_ANYEVENT_AVOID_GUARD> and C<PERL_ANYEVENT_AVOID_ASYNC_INTERRUPT> 2201=item C<PERL_ANYEVENT_AVOID_GUARD> and C<PERL_ANYEVENT_AVOID_ASYNC_INTERRUPT>
2118 2202
2119When these are set to C<1>, then the respective modules are not 2203When these are set to C<1>, then the respective modules are not
2120loaded. Mostly good for testing AnyEvent itself. 2204loaded. Mostly good for testing AnyEvent itself.

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