17 void recv_data_buf(int fd, struct readstruct *, void *buffer, int buflen);
18 int recv_data_errorcode_buf(int fd, struct readstruct *, void *buffer, int buflen);
19 void send_buf(int fd, struct writestruct * sendbuffer, void *buffer, int buflen);
20 void forcesend_buf(int fd, struct writestruct * sendbuffer, void *buffer, int buflen);