… | |
… | |
340 | =head2 CHILD PROCESS WATCHERS |
340 | =head2 CHILD PROCESS WATCHERS |
341 | |
341 | |
342 | You can also watch on a child process exit and catch its exit status. |
342 | You can also watch on a child process exit and catch its exit status. |
343 | |
343 | |
344 | The child process is specified by the C<pid> argument (if set to C<0>, it |
344 | The child process is specified by the C<pid> argument (if set to C<0>, it |
345 | watches for any child process exit). The watcher will trigger as often |
345 | watches for any child process exit). The watcher will triggered only when |
346 | as status change for the child are received. This works by installing a |
346 | the child process has finished and an exit status is available, not on |
347 | signal handler for C<SIGCHLD>. The callback will be called with the pid |
347 | any trace events (stopped/continued). |
348 | and exit status (as returned by waitpid), so unlike other watcher types, |
348 | |
349 | you I<can> rely on child watcher callback arguments. |
349 | The callback will be called with the pid and exit status (as returned by |
|
|
350 | waitpid), so unlike other watcher types, you I<can> rely on child watcher |
|
|
351 | callback arguments. |
|
|
352 | |
|
|
353 | This watcher type works by installing a signal handler for C<SIGCHLD>, |
|
|
354 | and since it cannot be shared, nothing else should use SIGCHLD or reap |
|
|
355 | random child processes (waiting for specific child processes, e.g. inside |
|
|
356 | C<system>, is just fine). |
350 | |
357 | |
351 | There is a slight catch to child watchers, however: you usually start them |
358 | There is a slight catch to child watchers, however: you usually start them |
352 | I<after> the child process was created, and this means the process could |
359 | I<after> the child process was created, and this means the process could |
353 | have exited already (and no SIGCHLD will be sent anymore). |
360 | have exited already (and no SIGCHLD will be sent anymore). |
354 | |
361 | |
… | |
… | |
850 | =cut |
857 | =cut |
851 | |
858 | |
852 | package AnyEvent; |
859 | package AnyEvent; |
853 | |
860 | |
854 | no warnings; |
861 | no warnings; |
855 | use strict; |
862 | use strict qw(vars subs); |
856 | |
863 | |
857 | use Carp; |
864 | use Carp; |
858 | |
865 | |
859 | our $VERSION = 4.23; |
866 | our $VERSION = 4.3; |
860 | our $MODEL; |
867 | our $MODEL; |
861 | |
868 | |
862 | our $AUTOLOAD; |
869 | our $AUTOLOAD; |
863 | our @ISA; |
870 | our @ISA; |
864 | |
871 | |
… | |
… | |
1016 | |
1023 | |
1017 | package AnyEvent::Base; |
1024 | package AnyEvent::Base; |
1018 | |
1025 | |
1019 | # default implementation for now and time |
1026 | # default implementation for now and time |
1020 | |
1027 | |
1021 | use Time::HiRes (); |
1028 | BEGIN { |
|
|
1029 | if (eval "use Time::HiRes (); time (); 1") { |
|
|
1030 | *_time = \&Time::HiRes::time; |
|
|
1031 | # if (eval "use POSIX (); (POSIX::times())... |
|
|
1032 | } else { |
|
|
1033 | *_time = sub { time }; # epic fail |
|
|
1034 | } |
|
|
1035 | } |
1022 | |
1036 | |
1023 | sub time { Time::HiRes::time } |
1037 | sub time { _time } |
1024 | sub now { Time::HiRes::time } |
1038 | sub now { _time } |
1025 | |
1039 | |
1026 | # default implementation for ->condvar |
1040 | # default implementation for ->condvar |
1027 | |
1041 | |
1028 | sub condvar { |
1042 | sub condvar { |
1029 | bless { @_ == 3 ? (_ae_cb => $_[2]) : () }, AnyEvent::CondVar:: |
1043 | bless { @_ == 3 ? (_ae_cb => $_[2]) : () }, AnyEvent::CondVar:: |
… | |
… | |
1168 | |
1182 | |
1169 | # undocumented/compatibility with pre-3.4 |
1183 | # undocumented/compatibility with pre-3.4 |
1170 | *broadcast = \&send; |
1184 | *broadcast = \&send; |
1171 | *wait = \&_wait; |
1185 | *wait = \&_wait; |
1172 | |
1186 | |
|
|
1187 | =head1 ERROR AND EXCEPTION HANDLING |
|
|
1188 | |
|
|
1189 | In general, AnyEvent does not do any error handling - it relies on the |
|
|
1190 | caller to do that if required. The L<AnyEvent::Strict> module (see also |
|
|
1191 | the C<PERL_ANYEVENT_STRICT> environment variable, below) provides strict |
|
|
1192 | checking of all AnyEvent methods, however, which is highly useful during |
|
|
1193 | development. |
|
|
1194 | |
|
|
1195 | As for exception handling (i.e. runtime errors and exceptions thrown while |
|
|
1196 | executing a callback), this is not only highly event-loop specific, but |
|
|
1197 | also not in any way wrapped by this module, as this is the job of the main |
|
|
1198 | program. |
|
|
1199 | |
|
|
1200 | The pure perl event loop simply re-throws the exception (usually |
|
|
1201 | within C<< condvar->recv >>), the L<Event> and L<EV> modules call C<< |
|
|
1202 | $Event/EV::DIED->() >>, L<Glib> uses C<< install_exception_handler >> and |
|
|
1203 | so on. |
|
|
1204 | |
|
|
1205 | =head1 ENVIRONMENT VARIABLES |
|
|
1206 | |
|
|
1207 | The following environment variables are used by this module or its |
|
|
1208 | submodules: |
|
|
1209 | |
|
|
1210 | =over 4 |
|
|
1211 | |
|
|
1212 | =item C<PERL_ANYEVENT_VERBOSE> |
|
|
1213 | |
|
|
1214 | By default, AnyEvent will be completely silent except in fatal |
|
|
1215 | conditions. You can set this environment variable to make AnyEvent more |
|
|
1216 | talkative. |
|
|
1217 | |
|
|
1218 | When set to C<1> or higher, causes AnyEvent to warn about unexpected |
|
|
1219 | conditions, such as not being able to load the event model specified by |
|
|
1220 | C<PERL_ANYEVENT_MODEL>. |
|
|
1221 | |
|
|
1222 | When set to C<2> or higher, cause AnyEvent to report to STDERR which event |
|
|
1223 | model it chooses. |
|
|
1224 | |
|
|
1225 | =item C<PERL_ANYEVENT_STRICT> |
|
|
1226 | |
|
|
1227 | AnyEvent does not do much argument checking by default, as thorough |
|
|
1228 | argument checking is very costly. Setting this variable to a true value |
|
|
1229 | will cause AnyEvent to load C<AnyEvent::Strict> and then to thoroughly |
|
|
1230 | check the arguments passed to most method calls. If it finds any problems |
|
|
1231 | it will croak. |
|
|
1232 | |
|
|
1233 | In other words, enables "strict" mode. |
|
|
1234 | |
|
|
1235 | Unlike C<use strict>, it is definitely recommended ot keep it off in |
|
|
1236 | production. Keeping C<PERL_ANYEVENT_STRICT=1> in your environment while |
|
|
1237 | developing programs can be very useful, however. |
|
|
1238 | |
|
|
1239 | =item C<PERL_ANYEVENT_MODEL> |
|
|
1240 | |
|
|
1241 | This can be used to specify the event model to be used by AnyEvent, before |
|
|
1242 | auto detection and -probing kicks in. It must be a string consisting |
|
|
1243 | entirely of ASCII letters. The string C<AnyEvent::Impl::> gets prepended |
|
|
1244 | and the resulting module name is loaded and if the load was successful, |
|
|
1245 | used as event model. If it fails to load AnyEvent will proceed with |
|
|
1246 | auto detection and -probing. |
|
|
1247 | |
|
|
1248 | This functionality might change in future versions. |
|
|
1249 | |
|
|
1250 | For example, to force the pure perl model (L<AnyEvent::Impl::Perl>) you |
|
|
1251 | could start your program like this: |
|
|
1252 | |
|
|
1253 | PERL_ANYEVENT_MODEL=Perl perl ... |
|
|
1254 | |
|
|
1255 | =item C<PERL_ANYEVENT_PROTOCOLS> |
|
|
1256 | |
|
|
1257 | Used by both L<AnyEvent::DNS> and L<AnyEvent::Socket> to determine preferences |
|
|
1258 | for IPv4 or IPv6. The default is unspecified (and might change, or be the result |
|
|
1259 | of auto probing). |
|
|
1260 | |
|
|
1261 | Must be set to a comma-separated list of protocols or address families, |
|
|
1262 | current supported: C<ipv4> and C<ipv6>. Only protocols mentioned will be |
|
|
1263 | used, and preference will be given to protocols mentioned earlier in the |
|
|
1264 | list. |
|
|
1265 | |
|
|
1266 | This variable can effectively be used for denial-of-service attacks |
|
|
1267 | against local programs (e.g. when setuid), although the impact is likely |
|
|
1268 | small, as the program has to handle connection errors already- |
|
|
1269 | |
|
|
1270 | Examples: C<PERL_ANYEVENT_PROTOCOLS=ipv4,ipv6> - prefer IPv4 over IPv6, |
|
|
1271 | but support both and try to use both. C<PERL_ANYEVENT_PROTOCOLS=ipv4> |
|
|
1272 | - only support IPv4, never try to resolve or contact IPv6 |
|
|
1273 | addresses. C<PERL_ANYEVENT_PROTOCOLS=ipv6,ipv4> support either IPv4 or |
|
|
1274 | IPv6, but prefer IPv6 over IPv4. |
|
|
1275 | |
|
|
1276 | =item C<PERL_ANYEVENT_EDNS0> |
|
|
1277 | |
|
|
1278 | Used by L<AnyEvent::DNS> to decide whether to use the EDNS0 extension |
|
|
1279 | for DNS. This extension is generally useful to reduce DNS traffic, but |
|
|
1280 | some (broken) firewalls drop such DNS packets, which is why it is off by |
|
|
1281 | default. |
|
|
1282 | |
|
|
1283 | Setting this variable to C<1> will cause L<AnyEvent::DNS> to announce |
|
|
1284 | EDNS0 in its DNS requests. |
|
|
1285 | |
|
|
1286 | =item C<PERL_ANYEVENT_MAX_FORKS> |
|
|
1287 | |
|
|
1288 | The maximum number of child processes that C<AnyEvent::Util::fork_call> |
|
|
1289 | will create in parallel. |
|
|
1290 | |
|
|
1291 | =back |
|
|
1292 | |
1173 | =head1 SUPPLYING YOUR OWN EVENT MODEL INTERFACE |
1293 | =head1 SUPPLYING YOUR OWN EVENT MODEL INTERFACE |
1174 | |
1294 | |
1175 | This is an advanced topic that you do not normally need to use AnyEvent in |
1295 | This is an advanced topic that you do not normally need to use AnyEvent in |
1176 | a module. This section is only of use to event loop authors who want to |
1296 | a module. This section is only of use to event loop authors who want to |
1177 | provide AnyEvent compatibility. |
1297 | provide AnyEvent compatibility. |
… | |
… | |
1210 | |
1330 | |
1211 | I<rxvt-unicode> also cheats a bit by not providing blocking access to |
1331 | I<rxvt-unicode> also cheats a bit by not providing blocking access to |
1212 | condition variables: code blocking while waiting for a condition will |
1332 | condition variables: code blocking while waiting for a condition will |
1213 | C<die>. This still works with most modules/usages, and blocking calls must |
1333 | C<die>. This still works with most modules/usages, and blocking calls must |
1214 | not be done in an interactive application, so it makes sense. |
1334 | not be done in an interactive application, so it makes sense. |
1215 | |
|
|
1216 | =head1 ENVIRONMENT VARIABLES |
|
|
1217 | |
|
|
1218 | The following environment variables are used by this module: |
|
|
1219 | |
|
|
1220 | =over 4 |
|
|
1221 | |
|
|
1222 | =item C<PERL_ANYEVENT_VERBOSE> |
|
|
1223 | |
|
|
1224 | By default, AnyEvent will be completely silent except in fatal |
|
|
1225 | conditions. You can set this environment variable to make AnyEvent more |
|
|
1226 | talkative. |
|
|
1227 | |
|
|
1228 | When set to C<1> or higher, causes AnyEvent to warn about unexpected |
|
|
1229 | conditions, such as not being able to load the event model specified by |
|
|
1230 | C<PERL_ANYEVENT_MODEL>. |
|
|
1231 | |
|
|
1232 | When set to C<2> or higher, cause AnyEvent to report to STDERR which event |
|
|
1233 | model it chooses. |
|
|
1234 | |
|
|
1235 | =item C<PERL_ANYEVENT_STRICT> |
|
|
1236 | |
|
|
1237 | AnyEvent does not do much argument checking by default, as thorough |
|
|
1238 | argument checking is very costly. Setting this variable to a true value |
|
|
1239 | will cause AnyEvent to load C<AnyEvent::Strict> and then to thoroughly |
|
|
1240 | check the arguments passed to most method calls. If it finds any problems |
|
|
1241 | it will croak. |
|
|
1242 | |
|
|
1243 | In other words, enables "strict" mode. |
|
|
1244 | |
|
|
1245 | Unlike C<use strict> it is definitely recommended ot keep it off in |
|
|
1246 | production. |
|
|
1247 | |
|
|
1248 | =item C<PERL_ANYEVENT_MODEL> |
|
|
1249 | |
|
|
1250 | This can be used to specify the event model to be used by AnyEvent, before |
|
|
1251 | auto detection and -probing kicks in. It must be a string consisting |
|
|
1252 | entirely of ASCII letters. The string C<AnyEvent::Impl::> gets prepended |
|
|
1253 | and the resulting module name is loaded and if the load was successful, |
|
|
1254 | used as event model. If it fails to load AnyEvent will proceed with |
|
|
1255 | auto detection and -probing. |
|
|
1256 | |
|
|
1257 | This functionality might change in future versions. |
|
|
1258 | |
|
|
1259 | For example, to force the pure perl model (L<AnyEvent::Impl::Perl>) you |
|
|
1260 | could start your program like this: |
|
|
1261 | |
|
|
1262 | PERL_ANYEVENT_MODEL=Perl perl ... |
|
|
1263 | |
|
|
1264 | =item C<PERL_ANYEVENT_PROTOCOLS> |
|
|
1265 | |
|
|
1266 | Used by both L<AnyEvent::DNS> and L<AnyEvent::Socket> to determine preferences |
|
|
1267 | for IPv4 or IPv6. The default is unspecified (and might change, or be the result |
|
|
1268 | of auto probing). |
|
|
1269 | |
|
|
1270 | Must be set to a comma-separated list of protocols or address families, |
|
|
1271 | current supported: C<ipv4> and C<ipv6>. Only protocols mentioned will be |
|
|
1272 | used, and preference will be given to protocols mentioned earlier in the |
|
|
1273 | list. |
|
|
1274 | |
|
|
1275 | This variable can effectively be used for denial-of-service attacks |
|
|
1276 | against local programs (e.g. when setuid), although the impact is likely |
|
|
1277 | small, as the program has to handle connection errors already- |
|
|
1278 | |
|
|
1279 | Examples: C<PERL_ANYEVENT_PROTOCOLS=ipv4,ipv6> - prefer IPv4 over IPv6, |
|
|
1280 | but support both and try to use both. C<PERL_ANYEVENT_PROTOCOLS=ipv4> |
|
|
1281 | - only support IPv4, never try to resolve or contact IPv6 |
|
|
1282 | addresses. C<PERL_ANYEVENT_PROTOCOLS=ipv6,ipv4> support either IPv4 or |
|
|
1283 | IPv6, but prefer IPv6 over IPv4. |
|
|
1284 | |
|
|
1285 | =item C<PERL_ANYEVENT_EDNS0> |
|
|
1286 | |
|
|
1287 | Used by L<AnyEvent::DNS> to decide whether to use the EDNS0 extension |
|
|
1288 | for DNS. This extension is generally useful to reduce DNS traffic, but |
|
|
1289 | some (broken) firewalls drop such DNS packets, which is why it is off by |
|
|
1290 | default. |
|
|
1291 | |
|
|
1292 | Setting this variable to C<1> will cause L<AnyEvent::DNS> to announce |
|
|
1293 | EDNS0 in its DNS requests. |
|
|
1294 | |
|
|
1295 | =item C<PERL_ANYEVENT_MAX_FORKS> |
|
|
1296 | |
|
|
1297 | The maximum number of child processes that C<AnyEvent::Util::fork_call> |
|
|
1298 | will create in parallel. |
|
|
1299 | |
|
|
1300 | =back |
|
|
1301 | |
1335 | |
1302 | =head1 EXAMPLE PROGRAM |
1336 | =head1 EXAMPLE PROGRAM |
1303 | |
1337 | |
1304 | The following program uses an I/O watcher to read data from STDIN, a timer |
1338 | The following program uses an I/O watcher to read data from STDIN, a timer |
1305 | to display a message once per second, and a condition variable to quit the |
1339 | to display a message once per second, and a condition variable to quit the |