int Hwrite( int fd , const void *buf , size_t len );
int Hwritev(int fd, const struct iovec *vector, size_t count);
int Hgettimeofday(struct timeval *tv, struct timezone *tz);
int Hwrite( int fd , const void *buf , size_t len );
int Hwritev(int fd, const struct iovec *vector, size_t count);
int Hgettimeofday(struct timeval *tv, struct timezone *tz);