HP B2355-90138 manual Dlpi Example Program

		LLA and DLPI Example Programs
		DLPI Example Program
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;

case DL_FDDI:

mac_name = ”FDDI”; break;

default:

printf(”error: unknown MAC type in ppa_info\n”); exit(1);

}

printf(”attaching to %s media on PPA %d\n”, mac_name, ppa);

/*

fill in ATTACH_REQ with the PPA we found, send the ATTACH_REQ, and wait for the OK_ACK

*/

attach_req->dl_primitive = DL_ATTACH_REQ;

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