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  my $r = run_forked("some external command", {
	  'wait_loop_callback' => sub {
          if (condition) {
              kill(1, $$);
          }
	  },
	  'terminate_on_signal' => 'HUP',
	  });

Combined with C<stdout_handler> and C<stderr_handler> allows terminating
external command based on its output. Could also be used as a timer
without engaging with L<alarm> (signals).

Remember that this code could be called every millisecond (depending
on the output which external command generates), so try to make it
as lightweight as possible.

=item C<discard_output>

Discards the buffering of the standard output and standard errors for return by run_forked().
With this option you have to use the std*_handlers to read what the command outputs.