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| LLA and DLPI Example Programs |
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| DLPI Example Program |
int |
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attach() { |
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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)) ==
}
/*
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 */
/* make sure we found at least one PPA */
printf(”error: no PPAs available\n”); exit(1);
}
/* examine the first PPA */
ppa_info = (dl_hp_ppa_info_t *)((u_char *)ctrl_area +
ppa =
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
*/
Chapter 2 | 25 |