unsigned long timespec_to_jiffies(struct timespec *value);
            void jiffies_to_timespec(unsigned long jiffies, struct timespec *value);
            unsigned long timeval_to_jiffies(struct timeval *value);
            void jiffies_to_timeval(unsigned long jiffies, struct timeval *value);

struct timeval {
            time_t tv_sec; /* seconds */
            suseconds_t tv_usec; /* microseconds */
            };
            struct timespec
            {
            long int tv_sec;
            long int tv_nsec;
            };

int gettimeofday(struct timeval *tv, struct timezone *tz);