The event management commands can also deal with signals as events. These two commands have the same effect:
(dbx) stop sig signal (dbx) catch signal
Having the signal event is more useful if you need to associate some pre-programmed action:
(dbx) when sig SIGCLD {echo Got $sig $signame;}
In this case make sure to first move SIGCLD to the ignore list:
(dbx) ignore SIGCLD