HP UX 11i v2 Networking Software manual 148

Sample Programs

Connection Mode

int dlsap_len; /* length of dlsap */

{

int i;

printf(”%s0x”, string);

for(i = 0; i < dlsap_len; i++) { printf(”%02x”, dlsap[i]);

}

printf(”\n”);

}

/************************************************************************** open the DLPI cloneable device file, get a list of available PPAs, and attach to the first PPA; returns a file descriptor for the stream

**************************************************************************/

int
attach() {
int	fd;	/* file descriptor */
int	ppa;	/* PPA to attach to */

dl_hp_ppa_req_t *ppa_req = (dl_attach_req_t *)ctrl_area; dl_hp_ppa_ack_t *ppa_ack = (dl_hp_ppa_ack_t *)ctrl_area; dl_hp_ppa_info_t *ppa_info;

dl_attach_req_t *attach_req = (dl_attach_req_t *)ctrl_area; char *mac_name;

/* open the device file */

if((fd = open(”/dev/dlpi”, O_RDWR)) == -1) { printf(”error: open failed, errno = %d\n”, errno); exit(1);

}

/*

find a PPA to attach to; we assume that the first PPA on the remote is on the same media as the first local PPA

*/

/* send a PPA_REQ and wait for the PPA_ACK */ ppa_req->dl_primitive = DL_HP_PPA_REQ; put_ctrl(fd, sizeof(dl_hp_ppa_req_t), 0); get_msg(fd); check_ctrl(DL_HP_PPA_ACK);

/* make sure we found at least one PPA */ if(ppa_ack->dl_length == 0) {

printf(”error: no PPAs available\n”); exit(1);

}

/* examine the first PPA */

ppa_info = (dl_hp_ppa_info_t *)((u_char *)ctrl_area + ppa_ack->dl_offset);

ppa = ppa_info->dl_ppa; switch(ppa_info->dl_mac_type) {

case DL_CSMACD: case DL_ETHER:

mac_name = ”Ethernet”; break;

case DL_TPR:

mac_name = ”Token Ring”; break;

148 Appendix A