AsyncStatus
asyncConnector_run(AsyncConnector* ac)
{
switch (ac->state) {
case CONNECT_ERROR:
errno = ac->error;
return ASYNC_ERROR;
case CONNECT_CONNECTING:
loopIo_dontWantWrite(ac->io);
/* We need to read the socket error to determine if
* the connection was really succesful or not. This
* is optional, because in case of error a future
* socket_recv() or socket_send() will fail anyway, but this
* allows us to get a better error value as soon as
* possible.
*/
ac->error = socket_get_error(ac->io->fd);
if (ac->error == 0) {
ac->state = CONNECT_COMPLETED;
return ASYNC_COMPLETE;
}
ac->state = CONNECT_ERROR;
errno = ac->error;
return ASYNC_ERROR;
default:
return ASYNC_COMPLETE;
}
}
GError*
gridd_client_step(struct client_s *client)
{
struct pollfd pfd = {-1, 0, 0};
if (!_client_to_pollfd(client, &pfd)) {
return NULL;
}
int rc = metautils_syscall_poll(&pfd, 1, 1000);
if (rc == 0) {
GTimeVal now;
g_get_current_time(&now);
gridd_client_expire(client, &now);
return NULL;
}
if (rc < 0)
return NEWERROR(errno, "poll errno=%d %s", errno, strerror(errno));
if (pfd.revents & POLLERR) {
GError *err = socket_get_error(pfd.fd);
g_prefix_error(&err, "%s: ", gridd_client_url(client));
gridd_client_fail(client, err);
g_clear_error(&err);
}
else
gridd_client_react(client);
return NULL;
}
GError*
gridd_client_step(struct gridd_client_s *client)
{
int rc;
struct pollfd pfd = {-1, 0, 0};
if (!_client_to_pollfd(client, &pfd))
return NULL;
retry:
rc = metautils_syscall_poll(&pfd, 1, 1000);
if (rc == 0) {
gridd_client_expire(client, oio_ext_monotonic_time ());
return NULL;
}
if (rc < 0) {
if (errno == EINTR) goto retry;
return NEWERROR(errno, "poll errno=%d %s", errno, strerror(errno));
}
if (pfd.revents & POLLERR) {
GError *err = socket_get_error(pfd.fd);
g_prefix_error(&err, "%s: ", gridd_client_url(client));
gridd_client_fail(client, err);
g_clear_error(&err);
}
else if (pfd.revents & (POLLIN|POLLOUT)) {
gridd_client_react(client);
}
return NULL;
}
static void tcp_wait_for_connect(void *opaque)
{
FdMigrationState *s = opaque;
int ret;
dprintf("connect completed\n");
ret = socket_get_error(s->fd);
if (ret < 0) {
dprintf("error connecting %d\n", val);
migrate_fd_error(s);
return;
}
qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL);
migrate_fd_connect(s);
}
int Socket::read(char* buffer, int nbytes) {
int err;
int r;
int chunk_size = 1024;
if (NULL == buffer) {
RX_ERROR("Trying to read into NULL buffer.");
return -1;
}
if (0 == nbytes) {
RX_ERROR("Buffer size is 0. No way we can read into that.");
return -2;
}
if (0 != isConnected()) {
return -3;
}
r = recv(handle, buffer, nbytes, 0);
if (r < 0) {
err = socket_get_error();
if (0 == socket_is_recoverable_error(err)) {
return 0;
}
RX_ERROR("Could not read data from socket: %s", strerror(errno));
close();
return -4;
}
if (0 == r) {
close();
return -5;
}
// if (NULL != listener) {
// listener->onSocketRead(buffer, r);
// }
return r;
}
int Socket::close() {
/* Already closed? */
if (0 != isConnected()) {
return 0;
}
/* Close */
if (-1 != handle) {
errno = EINTR;
#if defined(_WIN32)
int result = -1;
int err = 0;
do {
result = ::closesocket(handle);
handle = -1; /* event when closesocket returns < 0, we unset the handle so we can reuse it. */
if (0 != result) {
err = socket_get_error();
switch(err) {
case WSANOTINITIALISED: {
RX_ERROR("Socket not initialized.");
return 0;
}
case WSAENETDOWN: {
RX_ERROR("Network is down. Socket closed");
return 0;
}
case WSAENOTSOCK: {
RX_ERROR("The `sock` member is not a real socket. This is not supposed to happen but occurs when connect() fails.");
return 0;
}
case WSAEINPROGRESS: {
RX_VERBOSE("We're in the process of closing the socket; continuing.");
return 0;
}
case WSAEINTR: {
RX_VERBOSE("Call was interrupted.");
return 0;
}
case WSAEWOULDBLOCK: {
RX_ERROR("WSAWOULDBLOCK");
return 0;
}
default: {
RX_ERROR("Unhandled error in close(), error: %d", err);
return 0;
}
}
}
} while (0 != result);
#else
while (::close(handle) != 0 && EINTR == errno) { }
#endif
handle = -1;
}
return 0;
}
int Socket::send(const char* data, int nbytes) {
int err = 0;
int done = 0;
if (NULL == data) {
RX_ERROR("Trying to send NULL data.");
return -1;
}
if (0 == nbytes) {
RX_ERROR("Trying to send 0 bytes.");
return -2;
}
if (0 != isConnected()) {
RX_ERROR("Cannot send because we're not connected.");
return -3;
}
while (nbytes > 0 && 0 == isConnected()) {
#if defined(_WIN32)
done = ::send(handle, (const char*) data, nbytes, 0);
#else
done = ::send(handle, (const void*) data, nbytes, 0);
#endif
if (done != nbytes) {
/* @todo implement the situation where we couldn't send all bytes. */
RX_ERROR("Failed to send all bytes, this is a situation we need to handle correctly. We sent: %d, but should: %lu.", done, nbytes);
err = socket_get_error();
if (0 == socket_is_recoverable_error(err)) {
RX_ERROR("The error is recoverable.");
return -4;
}
else {
close();
return -5;
}
}
if (done < 0) {
err = socket_get_error();
if (0 == socket_is_recoverable_error(err)) {
return 0;
}
RX_ERROR("Error while sending data over socket: %s", strerror(errno));
if (0 != close()) {
RX_ERROR("Failed to cleanly close the socket after being disconnected.");
}
if (NULL != listener) {
listener->onSocketDisconnected();
}
return -3;
}
nbytes -= done;
}
return 0;
}
GError *
gridd_clients_step(struct client_s **clients)
{
struct client_s ** _lookup_client(int fd, struct client_s **ppc) {
struct client_s *c;
for (; (c = *ppc) ;ppc++) {
if (gridd_client_fd(c) == fd)
return ppc;
}
return ppc;
}
guint i, j;
int rc;
struct client_s *last, **plast;
GTimeVal now;
guint nbclients;
EXTRA_ASSERT(clients != NULL);
nbclients = g_strv_length((gchar**)clients);
EXTRA_ASSERT(nbclients > 0);
struct pollfd pfd[nbclients];
for (j=0,plast=clients; NULL != (last = *plast) ;plast++) {
if (_client_to_pollfd(last, pfd+j))
j++;
}
if (!j)
return NULL;
/* Wait for an event to happen */
if (!(rc = poll(pfd, j, 100))) {
g_get_current_time(&now);
_clients_expire(clients, &now);
return NULL;
}
if (rc < 0)
return NEWERROR(errno, "poll error (%s)", strerror(errno));
/* Then manage each event */
for (plast=clients,i=0; i<j ;i++) {
if (!pfd[i].revents)
continue;
/* Find the client for this pollfd */
plast = _lookup_client(pfd[i].fd, plast);
EXTRA_ASSERT(plast != NULL);
last = *plast;
/* Manage the poll() event */
if (pfd[i].revents & POLLERR) {
GError *err = socket_get_error(pfd[i].fd);
g_prefix_error(&err, "%s: ", gridd_client_url(last));
gridd_client_fail(last, err);
g_clear_error(&err);
}
else
gridd_client_react(last);
}
/* Now check for expired clients */
g_get_current_time(&now);
_clients_expire(clients, &now);
return NULL;
}
