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168 | =head2 I/O WATCHERS |
168 | =head2 I/O WATCHERS |
169 | |
169 | |
170 | You can create an I/O watcher by calling the C<< AnyEvent->io >> method |
170 | You can create an I/O watcher by calling the C<< AnyEvent->io >> method |
171 | with the following mandatory key-value pairs as arguments: |
171 | with the following mandatory key-value pairs as arguments: |
172 | |
172 | |
173 | C<fh> the Perl I<file handle> (I<not> file descriptor) to watch for events |
173 | C<fh> is the Perl I<file handle> (I<not> file descriptor) to watch |
174 | (AnyEvent might or might not keep a reference to this file handle). C<poll> |
174 | for events (AnyEvent might or might not keep a reference to this file |
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175 | handle). Note that only file handles pointing to things for which |
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176 | non-blocking operation makes sense are allowed. This includes sockets, |
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177 | most character devices, pipes, fifos and so on, but not for example files |
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178 | or block devices. |
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179 | |
175 | must be a string that is either C<r> or C<w>, which creates a watcher |
180 | C<poll> must be a string that is either C<r> or C<w>, which creates a |
176 | waiting for "r"eadable or "w"ritable events, respectively. C<cb> is the |
181 | watcher waiting for "r"eadable or "w"ritable events, respectively. |
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182 | |
177 | callback to invoke each time the file handle becomes ready. |
183 | C<cb> is the callback to invoke each time the file handle becomes ready. |
178 | |
184 | |
179 | Although the callback might get passed parameters, their value and |
185 | Although the callback might get passed parameters, their value and |
180 | presence is undefined and you cannot rely on them. Portable AnyEvent |
186 | presence is undefined and you cannot rely on them. Portable AnyEvent |
181 | callbacks cannot use arguments passed to I/O watcher callbacks. |
187 | callbacks cannot use arguments passed to I/O watcher callbacks. |
182 | |
188 | |
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867 | no warnings; |
873 | no warnings; |
868 | use strict qw(vars subs); |
874 | use strict qw(vars subs); |
869 | |
875 | |
870 | use Carp; |
876 | use Carp; |
871 | |
877 | |
872 | our $VERSION = 4.341; |
878 | our $VERSION = 4.351; |
873 | our $MODEL; |
879 | our $MODEL; |
874 | |
880 | |
875 | our $AUTOLOAD; |
881 | our $AUTOLOAD; |
876 | our @ISA; |
882 | our @ISA; |
877 | |
883 | |
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1064 | |
1070 | |
1065 | sub signal { |
1071 | sub signal { |
1066 | my (undef, %arg) = @_; |
1072 | my (undef, %arg) = @_; |
1067 | |
1073 | |
1068 | unless ($SIGPIPE_R) { |
1074 | unless ($SIGPIPE_R) { |
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1075 | require Fcntl; |
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1076 | |
1069 | if (AnyEvent::WIN32) { |
1077 | if (AnyEvent::WIN32) { |
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1078 | require AnyEvent::Util; |
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1079 | |
1070 | ($SIGPIPE_R, $SIGPIPE_W) = AnyEvent::Util::portable_pipe (); |
1080 | ($SIGPIPE_R, $SIGPIPE_W) = AnyEvent::Util::portable_pipe (); |
1071 | AnyEvent::Util::fh_nonblocking ($SIGPIPE_R) if $SIGPIPE_R; |
1081 | AnyEvent::Util::fh_nonblocking ($SIGPIPE_R) if $SIGPIPE_R; |
1072 | AnyEvent::Util::fh_nonblocking ($SIGPIPE_W) if $SIGPIPE_W; # just in case |
1082 | AnyEvent::Util::fh_nonblocking ($SIGPIPE_W) if $SIGPIPE_W; # just in case |
1073 | } else { |
1083 | } else { |
1074 | pipe $SIGPIPE_R, $SIGPIPE_W; |
1084 | pipe $SIGPIPE_R, $SIGPIPE_W; |
1075 | require Fcntl; |
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1076 | fcntl $SIGPIPE_R, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_R; |
1085 | fcntl $SIGPIPE_R, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_R; |
1077 | fcntl $SIGPIPE_W, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_W; # just in case |
1086 | fcntl $SIGPIPE_W, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_W; # just in case |
1078 | } |
1087 | } |
1079 | |
1088 | |
1080 | $SIGPIPE_R |
1089 | $SIGPIPE_R |
1081 | or Carp::croak "AnyEvent: unable to create a signal reporting pipe: $!\n"; |
1090 | or Carp::croak "AnyEvent: unable to create a signal reporting pipe: $!\n"; |
1082 | |
1091 | |
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1092 | # not strictly required, as $^F is normally 2, but let's make sure... |
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1093 | fcntl $SIGPIPE_R, &Fcntl::F_SETFD, &Fcntl::FD_CLOEXEC; |
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1094 | fcntl $SIGPIPE_W, &Fcntl::F_SETFD, &Fcntl::FD_CLOEXEC; |
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1095 | |
1083 | $SIG_IO = AnyEvent->io (fh => $SIGPIPE_R, poll => "r", cb => \&_signal_exec); |
1096 | $SIG_IO = AnyEvent->io (fh => $SIGPIPE_R, poll => "r", cb => \&_signal_exec); |
1084 | } |
1097 | } |
1085 | |
1098 | |
1086 | my $signal = uc $arg{signal} |
1099 | my $signal = uc $arg{signal} |
1087 | or Carp::croak "required option 'signal' is missing"; |
1100 | or Carp::croak "required option 'signal' is missing"; |
1088 | |
1101 | |
1089 | $SIG_CB{$signal}{$arg{cb}} = $arg{cb}; |
1102 | $SIG_CB{$signal}{$arg{cb}} = $arg{cb}; |
1090 | $SIG{$signal} ||= sub { |
1103 | $SIG{$signal} ||= sub { |
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1104 | local $!; |
1091 | syswrite $SIGPIPE_W, "\x00", 1 unless %SIG_EV; |
1105 | syswrite $SIGPIPE_W, "\x00", 1 unless %SIG_EV; |
1092 | undef $SIG_EV{$signal}; |
1106 | undef $SIG_EV{$signal}; |
1093 | }; |
1107 | }; |
1094 | |
1108 | |
1095 | bless [$signal, $arg{cb}], "AnyEvent::Base::Signal" |
1109 | bless [$signal, $arg{cb}], "AnyEvent::Base::Signal" |