homepage

Modules/signalmodule.c contains this code:
 if (handler == IgnoreHandler)
 func = SIG_IGN;
 else if (handler == DefaultHandler)
 func = SIG_DFL;
 ...
Here IgnoreHandler and DefaultHandler are ints. The code above effectively does an "is" comparison with those ints, assuming that SIG_IGN and SIG_DFL are amongst the small interned ints.