localhost$ perl d.pl
  child starting
  SIGARLM: main handler
  SIGARLM: main handler
  SIGARLM: main handler
  Maximal count of pending signals (120) exceeded at d.pl line 14.
localhost$ perl d.pl 
  child starting
  Alarm clock
localhost$ perl d.pl 
  child starting
  Maximal count of pending signals (120) exceeded at d.pl line 9.
  SIGARLM: main handler
localhost$ perl d.pl 
  child starting
  Alarm clock