… | |
… | |
176 | =head2 I/O WATCHERS |
176 | =head2 I/O WATCHERS |
177 | |
177 | |
178 | You can create an I/O watcher by calling the C<< AnyEvent->io >> method |
178 | You can create an I/O watcher by calling the C<< AnyEvent->io >> method |
179 | with the following mandatory key-value pairs as arguments: |
179 | with the following mandatory key-value pairs as arguments: |
180 | |
180 | |
181 | C<fh> is the Perl I<file handle> (I<not> file descriptor) to watch |
181 | C<fh> is the Perl I<file handle> (or a naked file descriptor) to watch |
182 | for events (AnyEvent might or might not keep a reference to this file |
182 | for events (AnyEvent might or might not keep a reference to this file |
183 | handle). Note that only file handles pointing to things for which |
183 | handle). Note that only file handles pointing to things for which |
184 | non-blocking operation makes sense are allowed. This includes sockets, |
184 | non-blocking operation makes sense are allowed. This includes sockets, |
185 | most character devices, pipes, fifos and so on, but not for example files |
185 | most character devices, pipes, fifos and so on, but not for example files |
186 | or block devices. |
186 | or block devices. |
… | |
… | |
1123 | # allow only one watcher per fd, so we dup it to get a different one). |
1123 | # allow only one watcher per fd, so we dup it to get a different one). |
1124 | sub _dupfh($$;$$) { |
1124 | sub _dupfh($$;$$) { |
1125 | my ($poll, $fh, $r, $w) = @_; |
1125 | my ($poll, $fh, $r, $w) = @_; |
1126 | |
1126 | |
1127 | # cygwin requires the fh mode to be matching, unix doesn't |
1127 | # cygwin requires the fh mode to be matching, unix doesn't |
1128 | my ($rw, $mode) = $poll eq "r" ? ($r, "<") |
1128 | my ($rw, $mode) = $poll eq "r" ? ($r, "<") : ($w, ">"); |
1129 | : $poll eq "w" ? ($w, ">") |
|
|
1130 | : Carp::croak "AnyEvent->io requires poll set to either 'r' or 'w'"; |
|
|
1131 | |
1129 | |
1132 | open my $fh2, "$mode&" . fileno $fh |
1130 | open my $fh2, "$mode&", $fh |
1133 | or die "cannot dup() filehandle: $!,"; |
1131 | or die "AnyEvent->io: cannot dup() filehandle in mode '$poll': $!,"; |
1134 | |
1132 | |
1135 | # we assume CLOEXEC is already set by perl in all important cases |
1133 | # we assume CLOEXEC is already set by perl in all important cases |
1136 | |
1134 | |
1137 | ($fh2, $rw) |
1135 | ($fh2, $rw) |
1138 | } |
1136 | } |