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Watchdog callback, receives AnyEvent::Process::Job instance as its argument.
If it returns false value, the watched process is killed (see on_kill). 

=item kill_interval (in seconds, optional)

Maximum time the process can run. After this time expires, the process is 
killed.

=item on_kill (optional, sends SIGKILL by default)

Called, when the process shall be killed. Receives AnyEvent::Process::Job 
instance as its argument.

=back

=head2 run

Run a process. Any argument specified to the constructor can be overridden here.
Returns AnyEvent::Process::Job, which represents the new process, or undef on an
error.

=over 4

=item Returned AnyEvent::Process::Job instance has following methods:

=over 4

=item pid

Returns PID of the process.

=item kill

Send signal specified as the argument to the process.

=item close

Close all pipes and socketpairs between this process and the child.

=back

=back

=head2 kill

Run the kill method of the latest created AnyEvent::Process::Job - sends signal
specified as its argument to the process.

=head2 pid

Run the pid method of the latest created AnyEvent::Process::Job - returns PID of
the process.

=head2 close

Run the close method of the latest created AnyEvent::Process::Job.

=head1 SEE ALSO

L<AnyEvent> - Event framework for PERL.

L<AnyEvent::Subprocess> - Similar module, but with more dependencies and a little
more complicated usage.

=head1 AUTHOR

Petr Malat E<lt>oss@malat.bizE<gt> L<http://malat.biz/>

=head1 COPYRIGHT

Copyright (c) 2012 by Petr Malat E<lt>oss@malat.bizE<gt>

This program is free software; you can redistribute it and/or modify it under 
the same terms as Perl itself.
See F<http://www.perl.com/perl/misc/Artistic.html>.