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#include <time.h> #include <limits.h> int __clock_gettime(clockid_t, struct timespec *); clock_t clock() { struct timespec ts; if (__clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts)) return -1; if (ts.tv_sec > LONG_MAX/1000000 || ts.tv_nsec/1000 > LONG_MAX-1000000*ts.tv_sec) return -1; return ts.tv_sec*1000000 + ts.tv_nsec/1000; } |