#ifndef _TIME_H #define _TIME_H #include <sys/cdefs.h> #include <sys/types.h> __BEGIN_DECLS time_t time(time_t *t) __THROW; double difftime(time_t time1, time_t time0) __THROW __attribute__((__const__)); #define CLOCKS_PER_SEC 1000000l clock_t clock(void); __END_DECLS #endif