static void handle_sigpoll(int signal_num)
{
fprintf(stderr, "*** Received SIGPOL event\n");
gDevPollArray[0].events = POLLIN;
poll(gDevPollArray, 1, 1000);
if (gDevPollArray[0].revents | POLLERR)
{
fprintf(stderr, " POLLERR occurred\n");
SKU_close(gDevPollArray[0].fd);
open_net(Ip_address, Port);
}
if (gDevPollArray[0].revents | POLLHUP)
{
fprintf(stderr, " POLLHUP occurred\n");
SKU_close(gDevPollArray[0].fd);
open_net(Ip_address, Port);
}
if (gDevPollArray[0].revents | POLLNVAL)
{
fprintf(stderr, " POLLNVAL occurred\n");
SKU_close(gDevPollArray[0].fd);
open_net(Ip_address, Port);
}
PORTsignal(signal_num, handle_sigpoll);
}
/*
* function do_bind(): open block devicename, bind network, do handshake,
* set block device configuration (size, blocksize),
* start session, fork and go to background
* returns: 1 when session finished, otherwise POSIX error code
*/
int do_bind(client_t * client)
{
struct dnbd_file cfile;
/* open block device */
if ((client->dnbd = open_dnbd(client)) < 0)
return -EINVAL;
printf("DNBD device successfully set.\n");
/* bind network */
if ((client->sock = open_net(client)) < 0)
return -EINVAL;
fprintf(stdout, "Socket successfully opened.\n");
/* configure block device */
if (ioctl(client->dnbd, DNBD_SET_SOCK, client->sock) < 0) {
close(client->sock);
fprintf(stderr, "ERROR: ioctl DNBD_SET_SOCKET failed!\n");
return -EINVAL;
}
if (ioctl(client->dnbd, DNBD_SET_GROUPNET, &client->mca_adr) < 0) {
fprintf(stderr,
"ERROR: ioctl DNBD_SET_GROUPNET failed!\n");
return -EINVAL;
}
fprintf(stdout, "Multicast address successfully set to %s.\n",
inet_ntoa(client->mca_adr.sin_addr));
/* start handshake */
if (do_handshake(client) < 0)
return -EINVAL;
/* set block size and capacity of device */
if (ioctl(client->dnbd, DNBD_SET_BLKSIZE, client->blksize) < 0) {
fprintf(stderr, "ERROR: ioctl DNBD_SET_BLKSIZE failed!\n");
return -EINVAL;
}
if (ioctl(client->dnbd, DNBD_SET_CAPACITY, &client->capacity) < 0) {
fprintf(stderr, "ERROR: ioctl DNBD_SET_SIZE failed!\n");
return -EINVAL;
}
/* activate cache, if necessary */
if (client->cachefile) {
cfile.name = client->cachefile;
cfile.len = strlen(client->cachefile);
if (ioctl(client->dnbd, DNBD_SET_CACHE, &cfile) < 0) {
fprintf(stderr,
"ERROR: ioctl DNBD_SET_CACHE failed!\n");
return -EINVAL;
}
printf("Cachefile successfully set.\n");
}
/* go to background */
if (!daemonize())
return -ECHILD;
if (ioctl(client->dnbd, DNBD_DO_IT) < 0) {
fprintf(stderr,
"ERROR: ioctl DNBD_DO_IT terminated unexpected!\n");
} else {
fprintf(stdout, "dnbd terminated.\n");
}
return 1;
}
int NetIORead(ui08 *pBuf, int count)
{
int chCount, lenmsg, nread, nbyts;
PMU_auto_register("Getting network data");
chCount = count;
if (count > byteCount)
{
if (byteCount)
{
memcpy( pBuf, pExtract, byteCount);
pBuf += byteCount;
chCount -= byteCount;
}
pExtract = buffer;
for (byteCount = 0; lenmsg = kNetRdSz, byteCount < kNetRdSz; /* NULL increment */)
{
nread = kNetRdSz;
if (nread > (lenmsg - byteCount))
nread = lenmsg - byteCount;
do
{
/* if (Params.debug_level >= DEBUG_EXTRA)
* fprintf(stderr,
* "Trying to read %d bytes from socket\n",
* nread);
*/
nbyts = SKU_read_timed_hb(gDevPollArray[0].fd,
(void *)&buffer[byteCount], nread,
READ_RETRIES, WAIT_MSECS,
1, PMU_auto_register);
/* if (Params.debug_level >= DEBUG_EXTRA)
* fprintf(stderr,
* " %d bytes read\n", nbyts);
*/
} while (nbyts == -1);
if (nread > 0 && nbyts <= 0)
{
/*
* Try to reconnect to the socket in case it died
*/
fprintf(stderr,
"*** Error %d returned from SKU_read_timed_hb(), reconnecting...\n",
nbyts);
SKU_close(gDevPollArray[0].fd);
open_net(Ip_address, Port);
perror("receive");
return(nbyts);
}
byteCount += nbyts;
}
if (chCount > byteCount)
{
fprintf(stderr, "\nNetIORead Size Exceeded!\n");
return( -1);
}
}
memcpy(pBuf, pExtract, chCount);
pExtract += chCount;
byteCount -= chCount;
return(count);
}