static inline int net_pollteardown(FAR struct socket *psock, struct pollfd *fds)
{
FAR struct uip_conn *conn = psock->s_conn;
FAR struct uip_callback_s *cb;
uip_lock_t flags;
/* Sanity check */
#ifdef CONFIG_DEBUG
if (!conn || !fds->priv)
{
return -EINVAL;
}
#endif
/* Recover the socket descriptor poll state info from the poll structure */
cb = (FAR struct uip_callback_s *)fds->priv;
if (cb)
{
/* Release the callback */
flags = uip_lock();
uip_tcpcallbackfree(conn, cb);
uip_unlock(flags);
/* Release the poll/select data slot */
fds->priv = NULL;
}
return OK;
}
static inline void netclose_disconnect(FAR struct socket *psock)
{
struct tcp_close_s state;
uip_lock_t flags;
/* Interrupts are disabled here to avoid race conditions */
flags = uip_lock();
/* Is the TCP socket in a connected state? */
if (_SS_ISCONNECTED(psock->s_flags))
{
struct uip_conn *conn = (struct uip_conn*)psock->s_conn;
/* Check for the case where the host beat us and disconnected first */
if (conn->tcpstateflags == UIP_ESTABLISHED)
{
/* Set up to receive TCP data event callbacks */
state.cl_cb = uip_tcpcallbackalloc(conn);
if (state.cl_cb)
{
state.cl_psock = psock;
sem_init(&state.cl_sem, 0, 0);
state.cl_cb->flags = UIP_NEWDATA|UIP_POLL|UIP_CLOSE|UIP_ABORT;
state.cl_cb->priv = (void*)&state;
state.cl_cb->event = netclose_interrupt;
/* Notify the device driver of the availaibilty of TX data */
netdev_txnotify(&conn->ripaddr);
/* Wait for the disconnect event */
(void)uip_lockedwait(&state.cl_sem);
/* We are now disconnected */
sem_destroy(&state.cl_sem);
uip_tcpcallbackfree(conn, state.cl_cb);
}
}
}
uip_unlock(flags);
}
static inline void tcp_teardown_callbacks(struct tcp_connect_s *pstate, int status)
{
struct uip_conn *conn = pstate->tc_conn;
/* Make sure that no further interrupts are processed */
uip_tcpcallbackfree(conn, pstate->tc_cb);
/* If we successfully connected, we will continue to monitor the connection state
* via callbacks.
*/
if (status < 0)
{
/* Failed to connect */
conn->connection_private = NULL;
conn->connection_event = NULL;
}
}
static inline int net_pollteardown(FAR struct socket *psock,
FAR struct pollfd *fds)
{
FAR struct uip_conn *conn = psock->s_conn;
FAR struct net_poll_s *info;
uip_lock_t flags;
/* Sanity check */
#ifdef CONFIG_DEBUG
if (!conn || !fds->priv)
{
return -EINVAL;
}
#endif
/* Recover the socket descriptor poll state info from the poll structure */
info = (FAR struct net_poll_s *)fds->priv;
DEBUGASSERT(info && info->fds && info->cb);
if (info)
{
/* Release the callback */
flags = uip_lock();
uip_tcpcallbackfree(conn, info->cb);
uip_unlock(flags);
/* Release the poll/select data slot */
info->fds->priv = NULL;
/* Then free the poll info container */
kfree(info);
}
return OK;
}
static inline void tcp_teardown_callbacks(struct tcp_connect_s *pstate,
int status)
{
FAR struct uip_conn *conn = pstate->tc_conn;
/* Make sure that no further interrupts are processed */
uip_tcpcallbackfree(conn, pstate->tc_cb);
pstate->tc_cb = NULL;
/* If we successfully connected, we will continue to monitor the connection
* state via callbacks.
*/
if (status < 0)
{
/* Failed to connect. Stop the connection event monitor */
net_stopmonitor(conn);
}
}
void uip_tcpfree(struct uip_conn *conn)
{
#if CONFIG_NET_NTCP_READAHEAD_BUFFERS > 0
struct uip_readahead_s *readahead;
#endif
uip_lock_t flags;
/* Because g_free_tcp_connections is accessed from user level and interrupt
* level, code, it is necessary to keep interrupts disabled during this
* operation.
*/
DEBUGASSERT(conn->crefs == 0);
flags = uip_lock();
/* Check if there is an allocated close callback structure */
if (conn->closecb != NULL)
{
uip_tcpcallbackfree(conn, conn->closecb);
}
/* UIP_ALLOCATED means that that the connection is not in the active list
* yet.
*/
if (conn->tcpstateflags != UIP_ALLOCATED)
{
/* Remove the connection from the active list */
dq_rem(&conn->node, &g_active_tcp_connections);
}
/* Release any read-ahead buffers attached to the connection */
#if CONFIG_NET_NTCP_READAHEAD_BUFFERS > 0
while ((readahead = (struct uip_readahead_s *)sq_remfirst(&conn->readahead)) != NULL)
{
uip_tcpreadaheadrelease(readahead);
}
#endif
/* Remove any backlog attached to this connection */
#ifdef CONFIG_NET_TCPBACKLOG
if (conn->backlog)
{
uip_backlogdestroy(conn);
}
/* If this connection is, itself, backlogged, then remove it from the
* parent connection's backlog list.
*/
if (conn->blparent)
{
uip_backlogdelete(conn->blparent, conn);
}
#endif
/* Mark the connection available and put it into the free list */
conn->tcpstateflags = UIP_CLOSED;
dq_addlast(&conn->node, &g_free_tcp_connections);
uip_unlock(flags);
}
void uip_tcpfree(struct uip_conn *conn)
{
FAR struct uip_callback_s *cb;
FAR struct uip_callback_s *next;
#ifdef CONFIG_NET_TCP_READAHEAD
FAR struct uip_readahead_s *readahead;
#endif
#ifdef CONFIG_NET_TCP_WRITE_BUFFERS
FAR struct uip_wrbuffer_s *wrbuffer;
#endif
uip_lock_t flags;
/* Because g_free_tcp_connections is accessed from user level and interrupt
* level, code, it is necessary to keep interrupts disabled during this
* operation.
*/
DEBUGASSERT(conn->crefs == 0);
flags = uip_lock();
/* Free remaining callbacks, actually there should be only the close callback
* left.
*/
for (cb = conn->list; cb; cb = next)
{
next = cb->flink;
uip_tcpcallbackfree(conn, cb);
}
/* UIP_ALLOCATED means that that the connection is not in the active list
* yet.
*/
if (conn->tcpstateflags != UIP_ALLOCATED)
{
/* Remove the connection from the active list */
dq_rem(&conn->node, &g_active_tcp_connections);
}
#ifdef CONFIG_NET_TCP_READAHEAD
/* Release any read-ahead buffers attached to the connection */
while ((readahead = (struct uip_readahead_s *)sq_remfirst(&conn->readahead)) != NULL)
{
uip_tcpreadahead_release(readahead);
}
#endif
#ifdef CONFIG_NET_TCP_WRITE_BUFFERS
/* Release any write buffers attached to the connection */
while ((wrbuffer = (struct uip_wrbuffer_s *)sq_remfirst(&conn->write_q)) != NULL)
{
uip_tcpwrbuffer_release(wrbuffer);
}
while ((wrbuffer = (struct uip_wrbuffer_s *)sq_remfirst(&conn->unacked_q)) != NULL)
{
uip_tcpwrbuffer_release(wrbuffer);
}
#endif
#ifdef CONFIG_NET_TCPBACKLOG
/* Remove any backlog attached to this connection */
if (conn->backlog)
{
uip_backlogdestroy(conn);
}
/* If this connection is, itself, backlogged, then remove it from the
* parent connection's backlog list.
*/
if (conn->blparent)
{
uip_backlogdelete(conn->blparent, conn);
}
#endif
/* Mark the connection available and put it into the free list */
conn->tcpstateflags = UIP_CLOSED;
dq_addlast(&conn->node, &g_free_tcp_connections);
uip_unlock(flags);
}
ssize_t send(int sockfd, const void *buf, size_t len, int flags)
{
FAR struct socket *psock = sockfd_socket(sockfd);
struct send_s state;
uip_lock_t save;
int err;
int ret = OK;
/* Verify that the sockfd corresponds to valid, allocated socket */
if (!psock || psock->s_crefs <= 0)
{
err = EBADF;
goto errout;
}
/* If this is an un-connected socket, then return ENOTCONN */
if (psock->s_type != SOCK_STREAM || !_SS_ISCONNECTED(psock->s_flags))
{
err = ENOTCONN;
goto errout;
}
/* Set the socket state to sending */
psock->s_flags = _SS_SETSTATE(psock->s_flags, _SF_SEND);
/* Perform the TCP send operation */
/* Initialize the state structure. This is done with interrupts
* disabled because we don't want anything to happen until we
* are ready.
*/
save = uip_lock();
memset(&state, 0, sizeof(struct send_s));
(void)sem_init(&state. snd_sem, 0, 0); /* Doesn't really fail */
state.snd_sock = psock; /* Socket descriptor to use */
state.snd_buflen = len; /* Number of bytes to send */
state.snd_buffer = buf; /* Buffer to send from */
if (len > 0)
{
struct uip_conn *conn = (struct uip_conn*)psock->s_conn;
/* Allocate resources to receive a callback */
state.snd_cb = uip_tcpcallbackalloc(conn);
if (state.snd_cb)
{
/* Get the initial sequence number that will be used */
state.snd_isn = uip_tcpgetsequence(conn->sndseq);
/* There is no outstanding, unacknowledged data after this
* initial sequence number.
*/
conn->unacked = 0;
/* Update the initial time for calculating timeouts */
#if defined(CONFIG_NET_SOCKOPTS) && !defined(CONFIG_DISABLE_CLOCK)
state.snd_time = clock_systimer();
#endif
/* Set up the callback in the connection */
state.snd_cb->flags = UIP_ACKDATA|UIP_REXMIT|UIP_POLL|UIP_CLOSE|UIP_ABORT|UIP_TIMEDOUT;
state.snd_cb->priv = (void*)&state;
state.snd_cb->event = send_interrupt;
/* Notify the device driver of the availaibilty of TX data */
netdev_txnotify(&conn->ripaddr);
/* Wait for the send to complete or an error to occur: NOTES: (1)
* uip_lockedwait will also terminate if a signal is received, (2) interrupts
* may be disabled! They will be re-enabled while the task sleeps and
* automatically re-enabled when the task restarts.
*/
ret = uip_lockedwait(&state. snd_sem);
/* Make sure that no further interrupts are processed */
uip_tcpcallbackfree(conn, state.snd_cb);
}
}
sem_destroy(&state. snd_sem);
uip_unlock(save);
/* Set the socket state to idle */
psock->s_flags = _SS_SETSTATE(psock->s_flags, _SF_IDLE);
/* Check for a errors. Errors are signaled by negative errno values
* for the send length
*/
if (state.snd_sent < 0)
{
err = state.snd_sent;
goto errout;
}
/* If uip_lockedwait failed, then we were probably reawakened by a signal. In
* this case, uip_lockedwait will have set errno appropriately.
*/
if (ret < 0)
{
err = -ret;
goto errout;
}
/* Return the number of bytes actually sent */
return state.snd_sent;
errout:
*get_errno_ptr() = err;
return ERROR;
}
static ssize_t tcp_recvfrom(FAR struct socket *psock, FAR void *buf, size_t len,
FAR struct sockaddr_in *infrom )
#endif
{
struct recvfrom_s state;
uip_lock_t save;
int ret;
/* Initialize the state structure. This is done with interrupts
* disabled because we don't want anything to happen until we
* are ready.
*/
save = uip_lock();
recvfrom_init(psock, buf, len, infrom, &state);
/* Handle any any TCP data already buffered in a read-ahead buffer. NOTE
* that there may be read-ahead data to be retrieved even after the
* socket has been disconnected.
*/
#if CONFIG_NET_NTCP_READAHEAD_BUFFERS > 0
recvfrom_readahead(&state);
/* The default return value is the number of bytes that we just copied into
* the user buffer. We will return this if the socket has become disconnected
* or if the user request was completely satisfied with data from the readahead
* buffers.
*/
ret = state.rf_recvlen;
#else
/* Otherwise, the default return value of zero is used (only for the case
* where len == state.rf_buflen is zero).
*/
ret = 0;
#endif
/* Verify that the SOCK_STREAM has been and still is connected */
if (!_SS_ISCONNECTED(psock->s_flags))
{
/* Was any data transferred from the readahead buffer after we were
* disconnected? If so, then return the number of bytes received. We
* will wait to return end disconnection indications the next time that
* recvfrom() is called.
*
* If no data was received (i.e., ret == 0 -- it will not be negative)
* and the connection was gracefully closed by the remote peer, then return
* success. If rf_recvlen is zero, the caller of recvfrom() will get an
* end-of-file indication.
*/
#if CONFIG_NET_NTCP_READAHEAD_BUFFERS > 0
if (ret <= 0 && !_SS_ISCLOSED(psock->s_flags))
#else
if (!_SS_ISCLOSED(psock->s_flags))
#endif
{
/* Nothing was previously received from the readahead buffers.
* The SOCK_STREAM must be (re-)connected in order to receive any
* additional data.
*/
ret = -ENOTCONN;
}
}
/* In general, this uIP-based implementation will not support non-blocking
* socket operations... except in a few cases: Here for TCP receive with read-ahead
* enabled. If this socket is configured as non-blocking then return EAGAIN
* if no data was obtained from the read-ahead buffers.
*/
else
#if CONFIG_NET_NTCP_READAHEAD_BUFFERS > 0
if (_SS_ISNONBLOCK(psock->s_flags))
{
/* Return the number of bytes read from the read-ahead buffer if
* something was received (already in 'ret'); EAGAIN if not.
*/
if (ret <= 0)
{
/* Nothing was received */
ret = -EAGAIN;
}
}
/* It is okay to block if we need to. If there is space to receive anything
* more, then we will wait to receive the data. Otherwise return the number
* of bytes read from the read-ahead buffer (already in 'ret').
*/
else
#endif
/* We get here when we we decide that we need to setup the wait for incoming
* TCP/IP data. Just a few more conditions to check:
*
* 1) Make sure thet there is buffer space to receive additional data
* (state.rf_buflen > 0). This could be zero, for example, if read-ahead
* buffering was enabled and we filled the user buffer with data from
* the read-ahead buffers. Aand
* 2) if read-ahead buffering is enabled (CONFIG_NET_NTCP_READAHEAD_BUFFERS > 0)
* and delay logic is disabled (CONFIG_NET_TCP_RECVDELAY == 0), then we
* not want to wait if we already obtained some data from the read-ahead
* buffer. In that case, return now with what we have (don't want for more
* because there may be no timeout).
*/
#if CONFIG_NET_TCP_RECVDELAY == 0 && CONFIG_NET_NTCP_READAHEAD_BUFFERS > 0
if (state.rf_recvlen == 0 && state.rf_buflen > 0)
#else
if (state.rf_buflen > 0)
#endif
{
struct uip_conn *conn = (struct uip_conn *)psock->s_conn;
/* Set up the callback in the connection */
state.rf_cb = uip_tcpcallbackalloc(conn);
if (state.rf_cb)
{
state.rf_cb->flags = UIP_NEWDATA|UIP_POLL|UIP_CLOSE|UIP_ABORT|UIP_TIMEDOUT;
state.rf_cb->priv = (void*)&state;
state.rf_cb->event = recvfrom_tcpinterrupt;
/* Wait for either the receive to complete or for an error/timeout to occur.
* NOTES: (1) uip_lockedwait will also terminate if a signal is received, (2)
* interrupts may be disabled! They will be re-enabled while the task sleeps
* and automatically re-enabled when the task restarts.
*/
ret = uip_lockedwait(&state.rf_sem);
/* Make sure that no further interrupts are processed */
uip_tcpcallbackfree(conn, state.rf_cb);
ret = recvfrom_result(ret, &state);
}
else
{
ret = -EBUSY;
}
}
uip_unlock(save);
recvfrom_uninit(&state);
return (ssize_t)ret;
}
