5b13797cce
Do not use pvconn argument to get the TCP connection pointer because pvconn is normally NULL for some events like NETDEV_DOWN. Instead, the TCP connection pointer can be reliably obtained from the corresponding TCP socket.
707 lines
21 KiB
C
707 lines
21 KiB
C
/****************************************************************************
|
|
* net/tcp/tcp_send_unbuffered.c
|
|
*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed with
|
|
* this work for additional information regarding copyright ownership. The
|
|
* ASF licenses this file to you under the Apache License, Version 2.0 (the
|
|
* "License"); you may not use this file except in compliance with the
|
|
* License. You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
* License for the specific language governing permissions and limitations
|
|
* under the License.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
#if defined(CONFIG_NET) && defined(CONFIG_NET_TCP) && \
|
|
!defined(CONFIG_NET_TCP_WRITE_BUFFERS)
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/socket.h>
|
|
|
|
#include <inttypes.h>
|
|
#include <stdint.h>
|
|
#include <stdbool.h>
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
#include <assert.h>
|
|
#include <debug.h>
|
|
|
|
#include <arch/irq.h>
|
|
|
|
#include <nuttx/semaphore.h>
|
|
#include <nuttx/net/net.h>
|
|
#include <nuttx/net/netdev.h>
|
|
#include <nuttx/net/arp.h>
|
|
#include <nuttx/net/tcp.h>
|
|
|
|
#include "netdev/netdev.h"
|
|
#include "devif/devif.h"
|
|
#include "socket/socket.h"
|
|
#include "inet/inet.h"
|
|
#include "arp/arp.h"
|
|
#include "icmpv6/icmpv6.h"
|
|
#include "neighbor/neighbor.h"
|
|
#include "route/route.h"
|
|
#include "tcp/tcp.h"
|
|
|
|
/****************************************************************************
|
|
* Pre-processor Definitions
|
|
****************************************************************************/
|
|
|
|
/* If both IPv4 and IPv6 support are both enabled, then we will need to build
|
|
* in some additional domain selection support.
|
|
*/
|
|
|
|
#if defined(CONFIG_NET_IPv4) && defined(CONFIG_NET_IPv6)
|
|
# define NEED_IPDOMAIN_SUPPORT 1
|
|
#endif
|
|
|
|
#define TCPIPv4BUF ((struct tcp_hdr_s *)&dev->d_buf[NET_LL_HDRLEN(dev) + IPv4_HDRLEN])
|
|
#define TCPIPv6BUF ((struct tcp_hdr_s *)&dev->d_buf[NET_LL_HDRLEN(dev) + IPv6_HDRLEN])
|
|
|
|
/****************************************************************************
|
|
* Private Types
|
|
****************************************************************************/
|
|
|
|
/* This structure holds the state of the send operation until it can be
|
|
* operated upon when the TX poll event occurs.
|
|
*/
|
|
|
|
struct send_s
|
|
{
|
|
FAR struct socket *snd_sock; /* Points to the parent socket structure */
|
|
FAR struct devif_callback_s *snd_cb; /* Reference to callback instance */
|
|
sem_t snd_sem; /* Used to wake up the waiting thread */
|
|
FAR const uint8_t *snd_buffer; /* Points to the buffer of data to send */
|
|
size_t snd_buflen; /* Number of bytes in the buffer to send */
|
|
ssize_t snd_sent; /* The number of bytes sent */
|
|
uint32_t snd_isn; /* Initial sequence number */
|
|
uint32_t snd_acked; /* The number of bytes acked */
|
|
uint32_t snd_prev_ack; /* The previous ACKed seq number */
|
|
#ifdef CONFIG_NET_TCP_WINDOW_SCALE
|
|
uint32_t snd_prev_wnd; /* The advertised window in the last
|
|
* incoming acknowledgment
|
|
*/
|
|
#else
|
|
uint16_t snd_prev_wnd;
|
|
#endif
|
|
int snd_dup_acks; /* Duplicate ACK counter */
|
|
};
|
|
|
|
/****************************************************************************
|
|
* Private Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: tcpsend_ipselect
|
|
*
|
|
* Description:
|
|
* If both IPv4 and IPv6 support are enabled, then we will need to select
|
|
* which one to use when generating the outgoing packet. If only one
|
|
* domain is selected, then the setup is already in place and we need do
|
|
* nothing.
|
|
*
|
|
* Input Parameters:
|
|
* dev - The structure of the network driver that caused the event
|
|
* pstate - sendto state structure
|
|
*
|
|
* Returned Value:
|
|
* None
|
|
*
|
|
* Assumptions:
|
|
* The network is locked.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef NEED_IPDOMAIN_SUPPORT
|
|
static inline void tcpsend_ipselect(FAR struct net_driver_s *dev,
|
|
FAR struct tcp_conn_s *conn)
|
|
{
|
|
/* Which domain does the socket support */
|
|
|
|
if (conn->domain == PF_INET)
|
|
{
|
|
/* Select the IPv4 domain */
|
|
|
|
tcp_ipv4_select(dev);
|
|
}
|
|
else /* if (conn->domain == PF_INET6) */
|
|
{
|
|
/* Select the IPv6 domain */
|
|
|
|
DEBUGASSERT(conn->domain == PF_INET6);
|
|
tcp_ipv6_select(dev);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: tcpsend_eventhandler
|
|
*
|
|
* Description:
|
|
* This function is called to perform the actual send operation when
|
|
* polled by the lower, device interfacing layer.
|
|
*
|
|
* Input Parameters:
|
|
* dev The structure of the network driver that caused the event
|
|
* conn The connection structure associated with the socket
|
|
* flags Set of events describing why the callback was invoked
|
|
*
|
|
* Returned Value:
|
|
* None
|
|
*
|
|
* Assumptions:
|
|
* The network is locked.
|
|
*
|
|
****************************************************************************/
|
|
|
|
static uint16_t tcpsend_eventhandler(FAR struct net_driver_s *dev,
|
|
FAR void *pvconn,
|
|
FAR void *pvpriv, uint16_t flags)
|
|
{
|
|
/* FAR struct tcp_conn_s *conn = (FAR struct tcp_conn_s *)pvconn;
|
|
*
|
|
* Do not use pvconn argument to get the TCP connection pointer (the above
|
|
* commented line) because pvconn is normally NULL for some events like
|
|
* NETDEV_DOWN. Instead, the TCP connection pointer can be reliably
|
|
* obtained from the corresponding TCP socket.
|
|
*/
|
|
|
|
FAR struct send_s *pstate = (FAR struct send_s *)pvpriv;
|
|
FAR struct socket *psock;
|
|
FAR struct tcp_conn_s *conn;
|
|
|
|
DEBUGASSERT(pstate != NULL);
|
|
|
|
psock = pstate->snd_sock;
|
|
DEBUGASSERT(psock != NULL);
|
|
|
|
/* Get the TCP connection pointer reliably from
|
|
* the corresponding TCP socket.
|
|
*/
|
|
|
|
conn = psock->s_conn;
|
|
DEBUGASSERT(conn != NULL);
|
|
|
|
/* The TCP socket is connected and, hence, should be bound to a device.
|
|
* Make sure that the polling device is the one that we are bound to.
|
|
*/
|
|
|
|
DEBUGASSERT(conn->dev != NULL);
|
|
if (dev != conn->dev)
|
|
{
|
|
return flags;
|
|
}
|
|
|
|
ninfo("flags: %04x acked: %" PRId32 " sent: %zd\n",
|
|
flags, pstate->snd_acked, pstate->snd_sent);
|
|
|
|
/* If this packet contains an acknowledgement, then update the count of
|
|
* acknowledged bytes.
|
|
*/
|
|
|
|
if ((flags & TCP_ACKDATA) != 0)
|
|
{
|
|
uint32_t ackno;
|
|
FAR struct tcp_hdr_s *tcp;
|
|
|
|
/* Get the offset address of the TCP header */
|
|
|
|
#ifdef CONFIG_NET_IPv4
|
|
#ifdef CONFIG_NET_IPv6
|
|
if (conn->domain == PF_INET)
|
|
#endif
|
|
{
|
|
DEBUGASSERT(IFF_IS_IPv4(dev->d_flags));
|
|
tcp = TCPIPv4BUF;
|
|
}
|
|
#endif /* CONFIG_NET_IPv4 */
|
|
|
|
#ifdef CONFIG_NET_IPv6
|
|
#ifdef CONFIG_NET_IPv4
|
|
else
|
|
#endif
|
|
{
|
|
DEBUGASSERT(IFF_IS_IPv6(dev->d_flags));
|
|
tcp = TCPIPv6BUF;
|
|
}
|
|
#endif /* CONFIG_NET_IPv6 */
|
|
|
|
/* The current acknowledgement number is the (relative) offset of the
|
|
* next byte needed by the receiver. The snd_isn is the offset of the
|
|
* first byte to send to the receiver. The difference is the number
|
|
* of bytes to be acknowledged.
|
|
*/
|
|
|
|
ackno = tcp_getsequence(tcp->ackno);
|
|
pstate->snd_acked = TCP_SEQ_SUB(ackno,
|
|
pstate->snd_isn);
|
|
ninfo("ACK: acked=%" PRId32 " sent=%zd buflen=%zd\n",
|
|
pstate->snd_acked, pstate->snd_sent, pstate->snd_buflen);
|
|
|
|
/* Have all of the bytes in the buffer been sent and acknowledged? */
|
|
|
|
if (pstate->snd_acked >= pstate->snd_buflen)
|
|
{
|
|
/* Yes. Then pstate->snd_buflen should hold the number of bytes
|
|
* actually sent.
|
|
*/
|
|
|
|
goto end_wait;
|
|
}
|
|
|
|
/* Fast Retransmit (RFC 5681): an acknowledgment is considered a
|
|
* "duplicate" when (a) the receiver of the ACK has outstanding data,
|
|
* (b) the incoming acknowledgment carries no data, (c) the SYN and
|
|
* FIN bits are both off, (d) the acknowledgment number is equal to
|
|
* the greatest acknowledgment received on the given connection
|
|
* and (e) the advertised window in the incoming acknowledgment equals
|
|
* the advertised window in the last incoming acknowledgment.
|
|
*/
|
|
|
|
if (pstate->snd_acked < pstate->snd_sent &&
|
|
(flags & TCP_NEWDATA) == 0 &&
|
|
(tcp->flags & (TCP_SYN | TCP_FIN)) == 0 &&
|
|
ackno == pstate->snd_prev_ack &&
|
|
conn->snd_wnd == pstate->snd_prev_wnd)
|
|
{
|
|
if (++pstate->snd_dup_acks >=
|
|
CONFIG_NET_TCP_FAST_RETRANSMIT_WATERMARK)
|
|
{
|
|
flags |= TCP_REXMIT;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
pstate->snd_dup_acks = 0;
|
|
}
|
|
|
|
pstate->snd_prev_ack = ackno;
|
|
pstate->snd_prev_wnd = conn->snd_wnd;
|
|
}
|
|
|
|
/* Check if we are being asked to retransmit data */
|
|
|
|
if ((flags & TCP_REXMIT) != 0)
|
|
{
|
|
/* According to RFC 6298 (5.4), retransmit the earliest segment
|
|
* that has not been acknowledged by the TCP receiver.
|
|
*/
|
|
|
|
/* Reconstruct the length of the earliest segment to be retransmitted */
|
|
|
|
uint32_t sndlen = pstate->snd_buflen - pstate->snd_acked;
|
|
|
|
if (sndlen > conn->mss)
|
|
{
|
|
sndlen = conn->mss;
|
|
}
|
|
|
|
conn->rexmit_seq = pstate->snd_isn + pstate->snd_acked;
|
|
|
|
#ifdef NEED_IPDOMAIN_SUPPORT
|
|
/* If both IPv4 and IPv6 support are enabled, then we will need to
|
|
* select which one to use when generating the outgoing packet.
|
|
* If only one domain is selected, then the setup is already in
|
|
* place and we need do nothing.
|
|
*/
|
|
|
|
tcpsend_ipselect(dev, conn);
|
|
#endif
|
|
/* Then set-up to send that amount of data. (this won't actually
|
|
* happen until the polling cycle completes).
|
|
*/
|
|
|
|
devif_send(dev,
|
|
&pstate->snd_buffer[pstate->snd_acked],
|
|
sndlen);
|
|
|
|
/* Continue waiting */
|
|
|
|
return flags;
|
|
}
|
|
|
|
/* Check for a loss of connection */
|
|
|
|
else if ((flags & TCP_DISCONN_EVENTS) != 0)
|
|
{
|
|
ninfo("Lost connection\n");
|
|
|
|
/* We could get here recursively through the callback actions of
|
|
* tcp_lost_connection(). So don't repeat that action if we have
|
|
* already been disconnected.
|
|
*/
|
|
|
|
if (_SS_ISCONNECTED(psock->s_flags))
|
|
{
|
|
/* Report not connected */
|
|
|
|
tcp_lost_connection(psock, pstate->snd_cb, flags);
|
|
}
|
|
|
|
pstate->snd_sent = -ENOTCONN;
|
|
goto end_wait;
|
|
}
|
|
|
|
/* Check if the outgoing packet is available (it may have been claimed
|
|
* by a sendto event serving a different thread).
|
|
*/
|
|
|
|
#if 0 /* We can't really support multiple senders on the same TCP socket */
|
|
else if (dev->d_sndlen > 0)
|
|
{
|
|
/* Another thread has beat us sending data, wait for the next poll */
|
|
|
|
return flags;
|
|
}
|
|
#endif
|
|
|
|
/* We get here if (1) not all of the data has been ACKed, (2) we have been
|
|
* asked to retransmit data, (3) the connection is still healthy, and (4)
|
|
* the outgoing packet is available for our use. In this case, we are
|
|
* now free to send more data to receiver -- UNLESS the buffer contains
|
|
* unprocessed incoming data. In that event, we will have to wait for the
|
|
* next polling cycle.
|
|
*/
|
|
|
|
if ((flags & TCP_NEWDATA) == 0 && pstate->snd_sent < pstate->snd_buflen)
|
|
{
|
|
/* Get the amount of data that we can send in the next packet */
|
|
|
|
uint32_t sndlen = pstate->snd_buflen - pstate->snd_sent;
|
|
|
|
if (sndlen > conn->mss)
|
|
{
|
|
sndlen = conn->mss;
|
|
}
|
|
|
|
/* Check if we have "space" in the window */
|
|
|
|
if ((pstate->snd_sent - pstate->snd_acked + sndlen) < conn->snd_wnd)
|
|
{
|
|
#ifdef NEED_IPDOMAIN_SUPPORT
|
|
/* If both IPv4 and IPv6 support are enabled, then we will need to
|
|
* select which one to use when generating the outgoing packet.
|
|
* If only one domain is selected, then the setup is already in
|
|
* place and we need do nothing.
|
|
*/
|
|
|
|
tcpsend_ipselect(dev, conn);
|
|
#endif
|
|
/* Then set-up to send that amount of data. (this won't actually
|
|
* happen until the polling cycle completes).
|
|
*/
|
|
|
|
devif_send(dev, &pstate->snd_buffer[pstate->snd_sent], sndlen);
|
|
|
|
/* Update the amount of data sent (but not necessarily ACKed) */
|
|
|
|
pstate->snd_sent += sndlen;
|
|
ninfo("SEND: acked=%" PRId32 " sent=%zd buflen=%zd\n",
|
|
pstate->snd_acked, pstate->snd_sent, pstate->snd_buflen);
|
|
}
|
|
}
|
|
|
|
/* Continue waiting */
|
|
|
|
return flags;
|
|
|
|
end_wait:
|
|
|
|
/* Do not allow any further callbacks */
|
|
|
|
DEBUGASSERT(pstate->snd_cb != NULL);
|
|
|
|
pstate->snd_cb->flags = 0;
|
|
pstate->snd_cb->priv = NULL;
|
|
pstate->snd_cb->event = NULL;
|
|
|
|
/* There are no outstanding, unacknowledged bytes */
|
|
|
|
conn->tx_unacked = 0;
|
|
|
|
/* Wake up the waiting thread */
|
|
|
|
nxsem_post(&pstate->snd_sem);
|
|
return flags;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: psock_tcp_send
|
|
*
|
|
* Description:
|
|
* psock_tcp_send() call may be used only when the TCP socket is in a
|
|
* connected state (so that the intended recipient is known).
|
|
*
|
|
* Input Parameters:
|
|
* psock An instance of the internal socket structure.
|
|
* buf Data to send
|
|
* len Length of data to send
|
|
* flags Send flags
|
|
*
|
|
* Returned Value:
|
|
* On success, returns the number of characters sent. On error,
|
|
* a negated errno value is returned.
|
|
*
|
|
* EAGAIN or EWOULDBLOCK
|
|
* The socket is marked non-blocking and the requested operation
|
|
* would block.
|
|
* EBADF
|
|
* An invalid descriptor was specified.
|
|
* ECONNRESET
|
|
* Connection reset by peer.
|
|
* EDESTADDRREQ
|
|
* The socket is not connection-mode, and no peer address is set.
|
|
* EFAULT
|
|
* An invalid user space address was specified for a parameter.
|
|
* EINTR
|
|
* A signal occurred before any data was transmitted.
|
|
* EINVAL
|
|
* Invalid argument passed.
|
|
* EISCONN
|
|
* The connection-mode socket was connected already but a recipient
|
|
* was specified. (Now either this error is returned, or the recipient
|
|
* specification is ignored.)
|
|
* EMSGSIZE
|
|
* The socket type requires that message be sent atomically, and the
|
|
* size of the message to be sent made this impossible.
|
|
* ENOBUFS
|
|
* The output queue for a network interface was full. This generally
|
|
* indicates that the interface has stopped sending, but may be
|
|
* caused by transient congestion.
|
|
* ENOMEM
|
|
* No memory available.
|
|
* ENOTCONN
|
|
* The socket is not connected, and no target has been given.
|
|
* ENOTSOCK
|
|
* The argument s is not a socket.
|
|
* EPIPE
|
|
* The local end has been shut down on a connection oriented socket.
|
|
* In this case the process will also receive a SIGPIPE unless
|
|
* MSG_NOSIGNAL is set.
|
|
*
|
|
****************************************************************************/
|
|
|
|
ssize_t psock_tcp_send(FAR struct socket *psock,
|
|
FAR const void *buf, size_t len, int flags)
|
|
{
|
|
FAR struct tcp_conn_s *conn;
|
|
struct send_s state;
|
|
int ret = OK;
|
|
|
|
/* Verify that the sockfd corresponds to valid, allocated socket */
|
|
|
|
if (psock == NULL || psock->s_type != SOCK_STREAM ||
|
|
psock->s_conn == NULL)
|
|
{
|
|
nerr("ERROR: Invalid socket\n");
|
|
ret = -EBADF;
|
|
goto errout;
|
|
}
|
|
|
|
/* Check early if this is an un-connected socket, if so, then
|
|
* return -ENOTCONN. Note, we will have to check this again, as we can't
|
|
* guarantee the state won't change until we have the network locked.
|
|
*/
|
|
|
|
if (!_SS_ISCONNECTED(psock->s_flags))
|
|
{
|
|
nerr("ERROR: Not connected\n");
|
|
ret = -ENOTCONN;
|
|
goto errout;
|
|
}
|
|
|
|
/* Make sure that we have the IP address mapping */
|
|
|
|
conn = (FAR struct tcp_conn_s *)psock->s_conn;
|
|
|
|
#if defined(CONFIG_NET_ARP_SEND) || defined(CONFIG_NET_ICMPv6_NEIGHBOR)
|
|
#ifdef CONFIG_NET_ARP_SEND
|
|
#ifdef CONFIG_NET_ICMPv6_NEIGHBOR
|
|
if (psock->s_domain == PF_INET)
|
|
#endif
|
|
{
|
|
/* Make sure that the IP address mapping is in the ARP table */
|
|
|
|
ret = arp_send(conn->u.ipv4.raddr);
|
|
}
|
|
#endif /* CONFIG_NET_ARP_SEND */
|
|
|
|
#ifdef CONFIG_NET_ICMPv6_NEIGHBOR
|
|
#ifdef CONFIG_NET_ARP_SEND
|
|
else
|
|
#endif
|
|
{
|
|
/* Make sure that the IP address mapping is in the Neighbor Table */
|
|
|
|
ret = icmpv6_neighbor(conn->u.ipv6.raddr);
|
|
}
|
|
#endif /* CONFIG_NET_ICMPv6_NEIGHBOR */
|
|
|
|
/* Did we successfully get the address mapping? */
|
|
|
|
if (ret < 0)
|
|
{
|
|
nerr("ERROR: Not reachable\n");
|
|
ret = -ENETUNREACH;
|
|
goto errout;
|
|
}
|
|
#endif /* CONFIG_NET_ARP_SEND || CONFIG_NET_ICMPv6_NEIGHBOR */
|
|
|
|
/* Perform the TCP send operation */
|
|
|
|
/* Initialize the state structure. This is done with the network
|
|
* locked because we don't want anything to happen until we are
|
|
* ready.
|
|
*/
|
|
|
|
net_lock();
|
|
|
|
/* Now that we have the network locked, we need to check the connection
|
|
* state again to ensure the connection is still valid.
|
|
*/
|
|
|
|
if (!_SS_ISCONNECTED(psock->s_flags))
|
|
{
|
|
nerr("ERROR: No longer connected\n");
|
|
net_unlock();
|
|
ret = -ENOTCONN;
|
|
goto errout;
|
|
}
|
|
|
|
memset(&state, 0, sizeof(struct send_s));
|
|
|
|
/* This semaphore is used for signaling and, hence, should not have
|
|
* priority inheritance enabled.
|
|
*/
|
|
|
|
nxsem_init(&state.snd_sem, 0, 0); /* Doesn't really fail */
|
|
nxsem_set_protocol(&state.snd_sem, SEM_PRIO_NONE);
|
|
|
|
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)
|
|
{
|
|
/* Allocate resources to receive a callback */
|
|
|
|
ret = -ENOMEM; /* Assume allocation failure */
|
|
state.snd_cb = tcp_callback_alloc(conn);
|
|
if (state.snd_cb)
|
|
{
|
|
/* Get the initial sequence number that will be used */
|
|
|
|
state.snd_isn = tcp_getsequence(conn->sndseq);
|
|
|
|
/* There is no outstanding, unacknowledged data after this
|
|
* initial sequence number.
|
|
*/
|
|
|
|
conn->tx_unacked = 0;
|
|
|
|
/* Set up the callback in the connection */
|
|
|
|
state.snd_cb->flags = (TCP_ACKDATA | TCP_REXMIT | TCP_POLL |
|
|
TCP_DISCONN_EVENTS);
|
|
state.snd_cb->priv = (FAR void *)&state;
|
|
state.snd_cb->event = tcpsend_eventhandler;
|
|
|
|
/* Notify the device driver of the availability of TX data */
|
|
|
|
tcp_send_txnotify(psock, conn);
|
|
|
|
/* Wait for the send to complete or an error to occur: NOTES:
|
|
* net_lockedwait will also terminate if a signal is received.
|
|
*/
|
|
|
|
for (; ; )
|
|
{
|
|
uint32_t acked = state.snd_acked;
|
|
|
|
ret = net_timedwait(&state.snd_sem,
|
|
_SO_TIMEOUT(psock->s_sndtimeo));
|
|
if (ret != -ETIMEDOUT || acked == state.snd_acked)
|
|
{
|
|
break; /* Timeout without any progress */
|
|
}
|
|
}
|
|
|
|
/* Make sure that no further events are processed */
|
|
|
|
tcp_callback_free(conn, state.snd_cb);
|
|
}
|
|
}
|
|
|
|
nxsem_destroy(&state.snd_sem);
|
|
net_unlock();
|
|
|
|
/* Check for a errors. Errors are signalled by negative errno values
|
|
* for the send length
|
|
*/
|
|
|
|
if (state.snd_sent < 0)
|
|
{
|
|
ret = state.snd_sent;
|
|
goto errout;
|
|
}
|
|
|
|
/* If net_timedwait failed, then we were probably reawakened by a signal.
|
|
* In this case, net_timedwait will have returned negated errno
|
|
* appropriately.
|
|
*/
|
|
|
|
if (ret < 0)
|
|
{
|
|
goto errout;
|
|
}
|
|
|
|
/* Return the number of bytes actually sent */
|
|
|
|
ret = state.snd_sent;
|
|
|
|
errout:
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: psock_tcp_cansend
|
|
*
|
|
* Description:
|
|
* psock_tcp_cansend() returns a value indicating if a write to the socket
|
|
* would block. It is still possible that the write may block if another
|
|
* write occurs first.
|
|
*
|
|
* Input Parameters:
|
|
* psock An instance of the internal socket structure.
|
|
*
|
|
* Returned Value:
|
|
* OK (Always can send).
|
|
*
|
|
* Assumptions:
|
|
* None
|
|
*
|
|
****************************************************************************/
|
|
|
|
int psock_tcp_cansend(FAR struct socket *psock)
|
|
{
|
|
return OK;
|
|
}
|
|
|
|
#endif /* CONFIG_NET && CONFIG_NET_TCP && !CONFIG_NET_TCP_WRITE_BUFFERS */
|