pdp11v/usr/include/nan.h

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/*	@(#)nan.h	1.2	*/
/* Handling of Not_a_Number's (only in IEEE floating-point standard) */

#define KILLFPE()	(void) kill(getpid(), 8)
#if u3b
#define NaN(X)	(((union { double d; struct { unsigned :1, e:11; } s; } \
			*)&X)->s.e == 0x7ff)
#define KILLNaN(X)	if (NaN(X)) KILLFPE()
#else
#define Nan(X)	0
#define KILLNaN(X)
#endif