1 #ifndef hertz_h 2 #define hertz_h 3 4 #define HZ_WRONG 0 /* impossible clock frequency */ 5 6 /* 7 * Discover the tick frequency of the machine if something goes wrong, 8 * we return HZ_WRONG, an impossible sampling frequency. 9 */ 10 11 extern int hertz PARAMS ((void)); 12 13 #endif /* hertz_h */ 14