Issues a ualarm call; interval_useconds is optional and will be 0 if
unspecified, resulting in alarm-like behaviour.
-=item tv_interval ( $ref_to_gettimeofday [, $ref_to_later_gettimeofday] )
+=item tv_interval
+
+S<tv_interval ( $ref_to_gettimeofday [, $ref_to_later_gettimeofday] )>
Returns the floating seconds between the two times, which should have been
returned by gettimeofday(). If the second argument is omitted, then the
behaviour. This function can be imported, resulting in a nice drop-in
replacement for the C<alarm> provided with perl, see the EXAMPLES below.
-=item setitimer ( $which, $floating_seconds [, $interval_floating_seconds ] )
+=item setitimer
+
+S<setitimer ( $which, $floating_seconds [, $interval_floating_seconds ] )>
Start up an interval timer: after a certain time, a signal is arrives,
and more may keep arriving at certain intervals. To disable a timer,