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Chapter 2 27
LLA and DLPI Example Programs
DLPI Example Program
dl_subs_bind_req_t *subs_bind_req = (dl_subs_bind_req_t*)ctrl_area;
dl_subs_bind_ack_t *subs_bind_ack = (dl_subs_bind_ack_t*)ctrl_area;
u_char *dlsap_addr;
/* Fill in Subsequent bind req */
subs_bind_req->dl_primitive = DL_SUBS_BIND_REQ;
subs_bind_req->dl_subs_sap_offset = DL_SUBS_BIND_REQ_SIZE;
subs_bind_req->dl_subs_sap_length = snapsap_len;
subs_bind_req->dl_subs_bind_class = subs_bind_class;
memcpy((caddr_t)&subs_bind_req[1], snapsap, snapsap_len);
/* send the SUBS_BIND_REQ and wait for the OK_ACK */
put_ctrl(fd, sizeof(dl_subs_bind_req_t)+snapsap_len, 0);
get_msg(fd);
check_ctrl(DL_SUBS_BIND_ACK);
/* return the DLSAP to the caller */
*dlsap_len = subs_bind_ack->dl_subs_sap_length;
dlsap_addr = (u_char *)ctrl_area +subs_bind_ack->dl_subs_sap_offset;
memcpy(dlsap, dlsap_addr, *dlsap_len);
}
/*********************************************************************
unbind, detach, and close
*********************************************************************/
void
cleanup(fd)
int fd; /* file descriptor */
{
dl_unbind_req_t*unbind_req = (dl_unbind_req_t *)ctrl_area;
dl_detach_req_t*detach_req = (dl_detach_req_t *)ctrl_area;
/* unbind */
unbind_req->dl_primitive = DL_UNBIND_REQ;
put_ctrl(fd, sizeof(dl_unbind_req_t), 0);
get_msg(fd);
check_ctrl(DL_OK_ACK);
/* detach */
detach_req->dl_primitive = DL_DETACH_REQ;
put_ctrl(fd, sizeof(dl_detach_req_t), 0);
get_msg(fd);
check_ctrl(DL_OK_ACK);
/* close */
close(fd);
}
/*********************************************************************
receive a data packet;
*********************************************************************/
int
recv_data(fd)
int fd; /* file descriptor */
{
dl_unitdata_ind_t *data_ind = (dl_unitdata_ind_t *)ctrl_area;