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);
+pid_t Hgetpid(void);
void* Hmalloc(size_t sz);
void Hfree(void *ptr);
void* Hrealloc(void *op, size_t nsz);