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Comparing AnyEvent/lib/AnyEvent.pm (file contents):
Revision 1.370 by root, Wed Aug 17 02:50:35 2011 UTC vs.
Revision 1.381 by root, Thu Sep 1 22:09:25 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
… …
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 1172
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
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 $MODEL;
1226 1242
1227our @ISA; 1243our @ISA;
1228 1244
1229our @REGISTRY; 1245our @REGISTRY;
… …
1236 eval "sub TAINT (){" . (${^TAINT}*1) . "}"; 1252 eval "sub TAINT (){" . (${^TAINT}*1) . "}";
1237 1253
1238 delete @ENV{grep /^PERL_ANYEVENT_/, keys %ENV} 1254 delete @ENV{grep /^PERL_ANYEVENT_/, keys %ENV}
1239 if ${^TAINT}; 1255 if ${^TAINT};
1240 1256
1241 $VERBOSE = $ENV{PERL_ANYEVENT_VERBOSE}*1; 1257 $ENV{"PERL_ANYEVENT_$_"} = $ENV{"AE_$_"}
1258 for grep s/^AE_// && !exists $ENV{"PERL_ANYEVENT_$_"}, keys %ENV;
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;
1242} 1266}
1243 1267
1244our $MAX_SIGNAL_LATENCY = 10; 1268our $MAX_SIGNAL_LATENCY = 10;
1245 1269
1246our %PROTOCOL; # (ipv4|ipv6) => (1|2), higher numbers are preferred 1270our %PROTOCOL; # (ipv4|ipv6) => (1|2), higher numbers are preferred
… …
1285 1309
1286 () 1310 ()
1287} 1311}
1288 1312
1289sub log($$;@) { 1313sub log($$;@) {
1314 # only load the big bloated module when we actually are about to log something
1315 if ($_[0] <= $VERBOSE) { # also catches non-numeric levels(!)
1290 require AnyEvent::Log; 1316 require AnyEvent::Log;
1291 # AnyEvent::Log overwrites this function 1317 # AnyEvent::Log overwrites this function
1292 goto &log; 1318 goto &log;
1319 }
1320
1321 0 # not logged
1322}
1323
1324if (length $ENV{PERL_ANYEVENT_LOG}) {
1325 require AnyEvent::Log; # AnyEvent::Log does the thing for us
1293} 1326}
1294 1327
1295our @models = ( 1328our @models = (
1296 [EV:: => AnyEvent::Impl::EV:: , 1], 1329 [EV:: => AnyEvent::Impl::EV:: , 1],
1297 [AnyEvent::Loop:: => AnyEvent::Impl::Perl:: , 1], 1330 [AnyEvent::Loop:: => AnyEvent::Impl::Perl:: , 1],
… …
1307 [POE::Kernel:: => AnyEvent::Impl::POE::], # lasciate ogni speranza 1340 [POE::Kernel:: => AnyEvent::Impl::POE::], # lasciate ogni speranza
1308 [Wx:: => AnyEvent::Impl::POE::], 1341 [Wx:: => AnyEvent::Impl::POE::],
1309 [Prima:: => AnyEvent::Impl::POE::], 1342 [Prima:: => AnyEvent::Impl::POE::],
1310 [IO::Async::Loop:: => AnyEvent::Impl::IOAsync::], # a bitch to autodetect 1343 [IO::Async::Loop:: => AnyEvent::Impl::IOAsync::], # a bitch to autodetect
1311 [Cocoa::EventLoop:: => AnyEvent::Impl::Cocoa::], 1344 [Cocoa::EventLoop:: => AnyEvent::Impl::Cocoa::],
1312 [FLTK:: => AnyEvent::Impl::FLTK2::], 1345 [FLTK:: => AnyEvent::Impl::FLTK::],
1313); 1346);
1314 1347
1315our @isa_hook; 1348our @isa_hook;
1316 1349
1317sub _isa_set { 1350sub _isa_set {
… …
1355 1388
1356 if ($ENV{PERL_ANYEVENT_MODEL} =~ /^([a-zA-Z0-9:]+)$/) { 1389 if ($ENV{PERL_ANYEVENT_MODEL} =~ /^([a-zA-Z0-9:]+)$/) {
1357 my $model = $1; 1390 my $model = $1;
1358 $model = "AnyEvent::Impl::$model" unless $model =~ s/::$//; 1391 $model = "AnyEvent::Impl::$model" unless $model =~ s/::$//;
1359 if (eval "require $model") { 1392 if (eval "require $model") {
1393 AnyEvent::log 7 => "loaded model '$model' (forced by \$ENV{PERL_ANYEVENT_MODEL}), using it.";
1360 $MODEL = $model; 1394 $MODEL = $model;
1361 AnyEvent::log 7 => "loaded model '$model' (forced by \$ENV{PERL_ANYEVENT_MODEL}), using it."
1362 if $VERBOSE >= 7;
1363 } else { 1395 } else {
1364 AnyEvent::log warn => "unable to load model '$model' (from \$ENV{PERL_ANYEVENT_MODEL}):\n$@"; 1396 AnyEvent::log 5 => "unable to load model '$model' (from \$ENV{PERL_ANYEVENT_MODEL}):\n$@";
1365 } 1397 }
1366 } 1398 }
1367 1399
1368 # check for already loaded models 1400 # check for already loaded models
1369 unless ($MODEL) { 1401 unless ($MODEL) {
1370 for (@REGISTRY, @models) { 1402 for (@REGISTRY, @models) {
1371 my ($package, $model) = @$_; 1403 my ($package, $model) = @$_;
1372 if (${"$package\::VERSION"} > 0) { 1404 if (${"$package\::VERSION"} > 0) {
1373 if (eval "require $model") { 1405 if (eval "require $model") {
1406 AnyEvent::log 7 => "autodetected model '$model', using it.";
1374 $MODEL = $model; 1407 $MODEL = $model;
1375 AnyEvent::log 7 => "autodetected model '$model', using it."
1376 if $VERBOSE >= 7;
1377 last; 1408 last;
1378 } 1409 }
1379 } 1410 }
1380 } 1411 }
1381 1412
… …
1387 $autoload 1418 $autoload
1388 and eval "require $package" 1419 and eval "require $package"
1389 and ${"$package\::VERSION"} > 0 1420 and ${"$package\::VERSION"} > 0
1390 and eval "require $model" 1421 and eval "require $model"
1391 ) { 1422 ) {
1423 AnyEvent::log 7 => "autoloaded model '$model', using it.";
1392 $MODEL = $model; 1424 $MODEL = $model;
1393 AnyEvent::log 7 => "autoloaded model '$model', using it."
1394 if $VERBOSE >= 7;
1395 last; 1425 last;
1396 } 1426 }
1397 } 1427 }
1398 1428
1399 $MODEL 1429 $MODEL
… …
1549 1579
1550sub time { 1580sub time {
1551 eval q{ # poor man's autoloading {} 1581 eval q{ # poor man's autoloading {}
1552 # probe for availability of Time::HiRes 1582 # probe for availability of Time::HiRes
1553 if (eval "use Time::HiRes (); Time::HiRes::time (); 1") { 1583 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 () }; 1584 *time = sub { Time::HiRes::time () };
1557 *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.";
1558 # if (eval "use POSIX (); (POSIX::times())... 1588 # if (eval "use POSIX (); (POSIX::times())...
1559 } else { 1589 } else {
1560 AnyEvent::log critical => "using built-in time(), WARNING, no sub-second resolution!";
1561 *time = sub { CORE::time }; 1590 *time = sub { CORE::time };
1562 *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!";
1563 } 1594 }
1564
1565 *now = \&time;
1566 }; 1595 };
1567 die if $@; 1596 die if $@;
1568 1597
1569 &time 1598 &time
1570} 1599}
… …
1663 1692
1664sub signal { 1693sub signal {
1665 eval q{ # poor man's autoloading {} 1694 eval q{ # poor man's autoloading {}
1666 # probe for availability of Async::Interrupt 1695 # probe for availability of Async::Interrupt
1667 if (_have_async_interrupt) { 1696 if (_have_async_interrupt) {
1668 AnyEvent::log 8 => "using Async::Interrupt for race-free signal handling." 1697 AnyEvent::log 8 => "using Async::Interrupt for race-free signal handling.";
1669 if $AnyEvent::VERBOSE >= 8;
1670 1698
1671 $SIGPIPE_R = new Async::Interrupt::EventPipe; 1699 $SIGPIPE_R = new Async::Interrupt::EventPipe;
1672 $SIG_IO = AE::io $SIGPIPE_R->fileno, 0, \&_signal_exec; 1700 $SIG_IO = AE::io $SIGPIPE_R->fileno, 0, \&_signal_exec;
1673 1701
1674 } else { 1702 } else {
1675 AnyEvent::log 8 => "using emulated perl signal handling with latency timer." 1703 AnyEvent::log 8 => "using emulated perl signal handling with latency timer.";
1676 if $AnyEvent::VERBOSE >= 8;
1677 1704
1678 if (AnyEvent::WIN32) { 1705 if (AnyEvent::WIN32) {
1679 require AnyEvent::Util; 1706 require AnyEvent::Util;
1680 1707
1681 ($SIGPIPE_R, $SIGPIPE_W) = AnyEvent::Util::portable_pipe (); 1708 ($SIGPIPE_R, $SIGPIPE_W) = AnyEvent::Util::portable_pipe ();
… …
1975$Event/EV::DIED->() >>, L<Glib> uses C<< install_exception_handler >> and 2002$Event/EV::DIED->() >>, L<Glib> uses C<< install_exception_handler >> and
1976so on. 2003so on.
1977 2004
1978=head1 ENVIRONMENT VARIABLES 2005=head1 ENVIRONMENT VARIABLES
1979 2006
1980The following environment variables are used by this module or its 2007AnyEvent supports a number of environment variables that tune the
1981submodules. 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.
1982 2013
1983Note that AnyEvent will remove I<all> environment variables starting with 2014All the environment variables documented here start with
1984C<PERL_ANYEVENT_> from C<%ENV> when it is loaded while taint mode is 2015C<PERL_ANYEVENT_>, which is what AnyEvent considers its own
1985enabled. 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:
1986 2044
1987=over 4 2045=over 4
1988 2046
1989=item C<PERL_ANYEVENT_VERBOSE> 2047=item C<PERL_ANYEVENT_VERBOSE>
1990 2048
1991By default, AnyEvent will be completely silent except in fatal 2049By default, AnyEvent will only log messages with loglevel C<3>
1992conditions. 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
1993talkative. 2052less) talkative.
1994 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
1995When set to C<5> or higher, causes AnyEvent to warn about unexpected 2061When 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 2062unexpected conditions, such as not being able to load the event model
1997C<PERL_ANYEVENT_MODEL>. 2063specified by C<PERL_ANYEVENT_MODEL>, or a guard callback throwing an
2064exception - this is the minimum recommended level.
1998 2065
1999When set to C<7> 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
2000model it chooses. 2067chooses.
2001 2068
2002When 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
2003which 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.
2004 2089
2005=item C<PERL_ANYEVENT_STRICT> 2090=item C<PERL_ANYEVENT_STRICT>
2006 2091
2007AnyEvent does not do much argument checking by default, as thorough 2092AnyEvent does not do much argument checking by default, as thorough
2008argument checking is very costly. Setting this variable to a true value 2093argument checking is very costly. Setting this variable to a true value
… …
2022If 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
2023C<AnyEvent::Socket::parse_hostport> (after replacing every occurance of 2108C<AnyEvent::Socket::parse_hostport> (after replacing every occurance of
2024C<$$> by the process pid) and an C<AnyEvent::Debug::shell> is bound on 2109C<$$> by the process pid) and an C<AnyEvent::Debug::shell> is bound on
2025that port. The shell object is saved in C<$AnyEvent::Debug::SHELL>. 2110that port. The shell object is saved in C<$AnyEvent::Debug::SHELL>.
2026 2111
2027This takes place when the first watcher is created. 2112This happens when the first watcher is created.
2028 2113
2029For 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
2030F<< /tmp/debug<pid>.sock >>, you could use this: 2115F<< /tmp/debug<pid>.sock >>, you could use this:
2031 2116
2032 PERL_ANYEVENT_DEBUG_SHELL=/tmp/debug\$\$.sock perlprog 2117 PERL_ANYEVENT_DEBUG_SHELL=/tmp/debug\$\$.sock perlprog
… …
2078but 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>
2079- only support IPv4, never try to resolve or contact IPv6 2164- only support IPv4, never try to resolve or contact IPv6
2080addresses. C<PERL_ANYEVENT_PROTOCOLS=ipv6,ipv4> support either IPv4 or 2165addresses. C<PERL_ANYEVENT_PROTOCOLS=ipv6,ipv4> support either IPv4 or
2081IPv6, but prefer IPv6 over IPv4. 2166IPv6, but prefer IPv6 over IPv4.
2082 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
2083=item C<PERL_ANYEVENT_EDNS0> 2174=item C<PERL_ANYEVENT_EDNS0>
2084 2175
2085Used 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
2086for DNS. This extension is generally useful to reduce DNS traffic, but 2177DNS. This extension is generally useful to reduce DNS traffic, especially
2087some (broken) firewalls drop such DNS packets, which is why it is off by 2178when DNSSEC is involved, but some (broken) firewalls drop such DNS
2088default. 2179packets, which is why it is off by default.
2089 2180
2090Setting 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
2091EDNS0 in its DNS requests. 2182EDNS0 in its DNS requests.
2092 2183
2093=item C<PERL_ANYEVENT_MAX_FORKS> 2184=item C<PERL_ANYEVENT_MAX_FORKS>
… …
2101resolver - this is the maximum number of parallel DNS requests that are 2192resolver - this is the maximum number of parallel DNS requests that are
2102sent to the DNS server. 2193sent to the DNS server.
2103 2194
2104=item C<PERL_ANYEVENT_RESOLV_CONF> 2195=item C<PERL_ANYEVENT_RESOLV_CONF>
2105 2196
2106The 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
2107configuration) in the default resolver. When set to the empty string, no 2198F</etc/resolv.conf> (or the OS-specific configuration) in the default
2108default config will be used. 2199resolver, or the empty string to select the default configuration.
2109 2200
2110=item C<PERL_ANYEVENT_CA_FILE>, C<PERL_ANYEVENT_CA_PATH>. 2201=item C<PERL_ANYEVENT_CA_FILE>, C<PERL_ANYEVENT_CA_PATH>.
2111 2202
2112When neither C<ca_file> nor C<ca_path> was specified during 2203When neither C<ca_file> nor C<ca_path> was specified during
2113L<AnyEvent::TLS> context creation, and either of these environment 2204L<AnyEvent::TLS> context creation, and either of these environment
2114variables exist, they will be used to specify CA certificate locations 2205variables are nonempty, they will be used to specify CA certificate
2115instead of a system-dependent default. 2206locations instead of a system-dependent default.
2116 2207
2117=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>
2118 2209
2119When 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
2120loaded. Mostly good for testing AnyEvent itself. 2211loaded. Mostly good for testing AnyEvent itself.

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