static int sendRequest(int socket_to_server, struct reg_request *reg_request) {
DPRINTF("Sending the following request:\n");
dprint_req(reg_request);
if(writen(socket_to_server,
(const char *) reg_request,
sizeof (struct reg_request)) < sizeof(struct reg_request)) {
perror("write");
DPRINTF("Error on write\n");
return -1;
}
if(readn(socket_to_server, (char *) reg_request, sizeof(struct reg_request)) < sizeof(struct reg_request)) {
perror("read");
DPRINTF("Error on read\n");
return -1;
}
DPRINTF("Received the following response:\n");
dprint_req(reg_request);
return 0;
}
/* Implements the register protocol:
* - Read which device
* - Read request (struct reg_request)
* - Return result
*/
int parse_request(int socket_to_client, struct nf2device **nf2devices,
int num_netfpgas) {
int nread;
struct reg_request req;
/* Read the request struct */
while ( (nread=readn(socket_to_client, (char *)&req,
sizeof(struct reg_request))) == sizeof(struct reg_request)) {
DPRINTF("Received reg_request:\n");
dprint_req(&req);
/* execute request */
if (req.device_num < num_netfpgas) {
DPRINTF("Device num checks out.\n");
if (req.type == READ_REQ) {
DPRINTF("Executing read.\n");
readReg(nf2devices[req.device_num], req.address, &req.data);
} else if (req.type == WRITE_REQ) {
DPRINTF("Executing write.\n");
writeReg(nf2devices[req.device_num], req.address, req.data);
} else if (req.type == CHECK_REQ) {
DPRINTF("Executing check.\n");
req.data = 1;
} else if (req.type == OPEN_REQ) {
DPRINTF("Executing open.\n");
req.data = 1;
} else if (req.type == CLOSE_REQ) {
DPRINTF("Executing close.\n");
DPRINTF("Sending response:\n");
dprint_req(&req);
if (writen(socket_to_client, (const char *)&req,
sizeof(struct reg_request))
< sizeof(struct reg_request)) {
fprintf(stderr, "Error: could not write to client.\n");
return -1;
}
return 0;
} else {
fprintf(stderr, "Error: Unknown request type %u.\n", req.type);
req.error = -1;
}
} else {
DPRINTF("Device number bad.\n");
if (req.type == CHECK_REQ) {
DPRINTF("Executing check_req.\n");
req.data = 0;
} else {
DPRINTF("Executing else.\n");
req.error = -1;
}
}
/* send response */
DPRINTF("Sending response:\n");
dprint_req(&req);
if (writen(socket_to_client, (const char *)&req,
sizeof(struct reg_request)) < sizeof(struct reg_request)) {
fprintf(stderr, "Error: could not write to client.\n");
return -1;
}
}
if (nread == 0) {
return 0;
} else if (nread < 0) {
fprintf(stderr, "Error reading the reg_request struct.\n");
return -1;
} else if (nread < sizeof(struct reg_request)) {
fprintf(stderr, "Error: Did not read full reg_request struct.\n");
return -1;
}
return 0;
}
