DLPI Programmer's Guide

Appendix A 161
Sample Programs
Connectionless Mode
*/
attach_req->dl_primitive = DL_ATTACH_REQ;
attach_req->dl_ppa = ppa;
put_ctrl(fd, sizeof(dl_attach_req_t), 0);
get_msg(fd);
check_ctrl(DL_OK_ACK);
/* return the file descriptor for the stream to the caller */
return(fd);
}
/**************************************************************************
bind to a sap with a specified service mode and max_conind;
returns the local DLSAP and its length
**************************************************************************/
void
bind(fd, sap, max_conind, service_mode, dlsap, dlsap_len)
int fd; /* file descriptor */
int sap; /* 802.2 SAP to bind on */
int max_conind; /* max # of connect indications to accept */
int service_mode; /* either DL_CODLS or DL_CLDLS */
u_char *dlsap; /* return DLSAP */
int *dlsap_len; /* return length of dlsap */
{
dl_bind_req_t *bind_req = (dl_bind_req_t *)ctrl_area;
dl_bind_ack_t *bind_ack = (dl_bind_ack_t *)ctrl_area;
u_char *dlsap_addr;
/* fill in the BIND_REQ */
bind_req->dl_primitive = DL_BIND_REQ;
bind_req->dl_sap = sap;
bind_req->dl_max_conind = max_conind;
bind_req->dl_service_mode = service_mode;
bind_req->dl_conn_mgmt = 0; /* conn_mgmt is NOT supported */
bind_req->dl_xidtest_flg = 0; /* user will handle TEST & XID pkts */
/* send the BIND_REQ and wait for the OK_ACK */
put_ctrl(fd, sizeof(dl_bind_req_t), 0);
get_msg(fd);
check_ctrl(DL_BIND_ACK);
/* return the DLSAP to the caller */
*dlsap_len = bind_ack->dl_addr_length;
dlsap_addr = (u_char *)ctrl_area + bind_ack->dl_addr_offset;
memcpy(dlsap, dlsap_addr, *dlsap_len);
}
/**************************************************************************
bind to a SNAP sap via the DL_PEER_BIND, or DL_HIERARCHICAL_BIND
subsequent bind class; returns the local DLSAP and its length
**************************************************************************/
void
subs_bind(fd, snapsap, snapsap_len, subs_bind_class, dlsap, dlsap_len)
int fd;
u_char *snapsap;
int subs_bind_class;
u_char *dlsap;