Copyright 1999-2003 John D. Polstra.
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* This product includes software developed by John D. Polstra.
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The SigHandler interface allows Unix signals to be serviced in
normal application code, where all the facilities of the thread
scheduler and garbage collector are available.
INTERFACE SigHandler;
TYPE
T = OBJECT METHODS
apply(sig: INTEGER);
END;
SigNum = [1..255];
PROCEDURE Register(sig: SigNum;
handler: T);
Registers a handler for the signal sig. If handler is NIL,
restores the default action for sig.
PROCEDURE Block();
Suspends the handling of signals.
PROCEDURE Unblock();
Resumes handling signals.
PROCEDURE ShutDown();
Kills off the SigHandler.T.
END SigHandler.