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fix checking on_signal/3 (obs from Theo Mantadelis).

This commit is contained in:
Vitor Santos Costa 2010-09-24 12:37:36 +01:00
parent 68f49e9bdd
commit 206638e92b
1 changed files with 13 additions and 1 deletions
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14
pl/signals.yap
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@ -210,6 +210,18 @@
'$signal_def'(sig_alarm, true).
'$signal'(sig_hup).
'$signal'(sig_usr1).
'$signal'(sig_usr2).
'$signal'(sig_pipe).
'$signal'(sig_alarm).
'$signal'(sig_vtalarm).
on_signal(Signal,OldAction,NewAction) :-
var(Signal), !,
(nonvar(OldAction) -> throw(error(instantiation_error,on_signal/3)) ; true),
'$signal'(Signal),
on_signal(Signal, OldAction, NewAction).
on_signal(Signal,OldAction,default) :-
'$reset_signal'(Signal, OldAction).
on_signal(Signal,OldAction,Action) :-
@ -219,7 +231,7 @@ on_signal(Signal,OldAction,Action) :-
Action = (_:Goal),
var(Goal), !,
'$check_signal'(Signal, OldAction),
Action = OldAction.
Goal = OldAction.
on_signal(Signal,OldAction,Action) :-
'$reset_signal'(Signal, OldAction),
% 13211-2 speaks only about callable