69cbd66244
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@378 42af7a65-404d-4744-a932-0658087f49c3
357 lines
11 KiB
C
357 lines
11 KiB
C
/****************************************************************************
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* net/send.c
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*
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* Copyright (C) 2007 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#ifdef CONFIG_NET
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <string.h>
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#include <errno.h>
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#include <debug.h>
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#include <arch/irq.h>
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#include "net-internal.h"
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/****************************************************************************
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* Definitions
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****************************************************************************/
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#define STATE_POLLWAIT 1
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#define STATE_DATA_SENT 2
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/* This structure holds the state of the send operation until it can be
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* operated upon from the interrupt level.
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*/
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struct send_s
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{
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FAR struct socket *snd_sock; /* Points to the parent socket structure */
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sem_t snd_sem; /* Used to wake up the waiting thread */
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FAR const uint8 *snd_buffer; /* Points to the buffer of data to send */
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size_t snd_buflen; /* Number of bytes in the buffer to send */
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ssize_t snd_sent; /* The number of bytes sent */
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uint8 snd_state; /* The state of the send operation. */
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Function: send_interrupt
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*
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* Description:
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* This function is called from the interrupt level to perform the actual
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* send operation when polled by the uIP layer.
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*
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* Parameters:
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* dev The sructure of the network driver that caused the interrupt
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* conn The connection structure associated with the socket
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* flags Set of events describing why the callback was invoked
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*
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* Returned Value:
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* None
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*
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* Assumptions:
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* Running at the interrupt level
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*
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****************************************************************************/
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static uint8 send_interrupt(struct uip_driver_s *dev, struct uip_conn *conn, uint8 flags)
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{
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struct send_s *pstate = (struct send_s *)conn->data_private;
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vdbg("flags: %02x state: %d\n", flags, pstate->snd_state);
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/* If the data has not been sent OR if it needs to be retransmitted,
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* then send it now.
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*/
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if (pstate->snd_state != STATE_DATA_SENT || uip_rexmit_event(flags))
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{
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if (pstate->snd_buflen > uip_mss(conn))
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{
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uip_send(dev, pstate->snd_buffer, uip_mss(conn));
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}
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else
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{
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uip_send(dev, pstate->snd_buffer, pstate->snd_buflen);
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}
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pstate->snd_state = STATE_DATA_SENT;
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}
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/* Check if all data has been sent and acknowledged */
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else if (pstate->snd_state == STATE_DATA_SENT && uip_ack_event(flags))
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{
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/* Yes.. the data has been sent AND acknowledged */
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if (pstate->snd_buflen > uip_mss(conn))
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{
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/* Not all data has been sent */
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pstate->snd_sent += uip_mss(conn);
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pstate->snd_buflen -= uip_mss(conn);
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pstate->snd_buffer += uip_mss(conn);
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/* Send again on the next poll */
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pstate->snd_state = STATE_POLLWAIT;
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}
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else
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{
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/* All data has been sent */
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pstate->snd_sent += pstate->snd_buflen;
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pstate->snd_buffer += pstate->snd_buflen;
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pstate->snd_buflen = 0;
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/* Don't allow any further call backs. */
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conn->data_private = NULL;
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conn->data_event = NULL;
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/* Wake up the waiting thread, returning the number of bytes
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* actually sent.
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*/
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sem_post(&pstate->snd_sem);
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}
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}
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/* Check for a loss of connection */
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else if ((flags & (UIP_CLOSE|UIP_ABORT|UIP_TIMEDOUT)) != 0)
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{
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/* Stop further callbacks */
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conn->data_private = NULL;
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conn->data_event = NULL;
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/* Report not connected */
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pstate->snd_sent = -ENOTCONN;
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/* Wake up the waiting thread */
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sem_post(&pstate->snd_sem);
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}
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return 0;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Function: send
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*
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* Description:
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* The send() call may be used only when the socket is in a connected state
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* (so that the intended recipient is known). The only difference between
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* send() and write() is the presence of flags. With zero flags parameter,
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* send() is equivalent to write(). Also, send(sockfd,buf,len,flags) is
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* equivalent to sendto(sockfd,buf,len,flags,NULL,0).
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*
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* Parameters:
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* sockfd Socket descriptor of socket
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* buf Data to send
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* len Length of data to send
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* flags Send flags
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*
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* Returned Value:
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* On success, returns the number of characters sent. On error,
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* -1 is returned, and errno is set appropriately:
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*
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* EAGAIN or EWOULDBLOCK
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* The socket is marked non-blocking and the requested operation
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* would block.
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* EBADF
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* An invalid descriptor was specified.
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* ECONNRESET
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* Connection reset by peer.
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* EDESTADDRREQ
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* The socket is not connection-mode, and no peer address is set.
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* EFAULT
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* An invalid user space address was specified for a parameter.
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* EINTR
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* A signal occurred before any data was transmitted.
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* EINVAL
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* Invalid argument passed.
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* EISCONN
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* The connection-mode socket was connected already but a recipient
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* was specified. (Now either this error is returned, or the recipient
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* specification is ignored.)
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* EMSGSIZE
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* The socket type requires that message be sent atomically, and the
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* size of the message to be sent made this impossible.
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* ENOBUFS
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* The output queue for a network interface was full. This generally
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* indicates that the interface has stopped sending, but may be
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* caused by transient congestion.
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* ENOMEM
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* No memory available.
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* ENOTCONN
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* The socket is not connected, and no target has been given.
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* ENOTSOCK
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* The argument s is not a socket.
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* EOPNOTSUPP
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* Some bit in the flags argument is inappropriate for the socket
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* type.
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* EPIPE
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* The local end has been shut down on a connection oriented socket.
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* In this case the process will also receive a SIGPIPE unless
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* MSG_NOSIGNAL is set.
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*
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* Assumptions:
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*
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****************************************************************************/
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ssize_t send(int sockfd, const void *buf, size_t len, int flags)
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{
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FAR struct socket *psock = sockfd_socket(sockfd);
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struct uip_conn *conn;
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struct send_s state;
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irqstate_t save;
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int err;
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int ret = OK;
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/* Verify that the sockfd corresponds to valid, allocated socket */
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if (!psock || psock->s_crefs <= 0)
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{
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err = EBADF;
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goto errout;
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}
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/* If this is a connected socket, then return ENOTCONN */
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if (psock->s_type != SOCK_STREAM || !_SS_ISCONNECTED(psock->s_flags))
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{
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err = ENOTCONN;
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goto errout;
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}
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/* Set the socket state to sending */
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psock->s_flags = _SS_SETSTATE(psock->s_flags, _SF_SEND);
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/* Perform the TCP send operation */
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/* Initialize the state structure. This is done with interrupts
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* disabled because we don't want anything to happen until we
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* are ready.
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*/
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save = irqsave();
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memset(&state, 0, sizeof(struct send_s));
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(void)sem_init(&state. snd_sem, 0, 0); /* Doesn't really fail */
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state.snd_sock = psock;
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state.snd_buflen = len;
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state.snd_buffer = buf;
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state.snd_state = STATE_POLLWAIT;
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if (len > 0)
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{
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/* Set up the callback in the connection */
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conn = (struct uip_conn *)psock->s_conn;
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conn->data_private = (void*)&state;
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conn->data_event = send_interrupt;
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/* Wait for the send to complete or an error to occur: NOTES: (1)
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* sem_wait will also terminate if a signal is received, (2) interrupts
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* are disabled! They will be re-enabled while the task sleeps and
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* automatically re-enabled when the task restarts.
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*/
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ret = sem_wait(&state. snd_sem);
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/* Make sure that no further interrupts are processed */
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conn->data_private = NULL;
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conn->data_event = NULL;
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}
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sem_destroy(&state. snd_sem);
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irqrestore(save);
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/* Set the socket state to idle */
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psock->s_flags = _SS_SETSTATE(psock->s_flags, _SF_IDLE);
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/* Check for a errors. Errors are signaled by negative errno values
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* for the send length
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*/
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if (state.snd_sent < 0)
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{
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err = state.snd_sent;
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goto errout;
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}
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/* If sem_wait failed, then we were probably reawakened by a signal. In
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* this case, sem_wait will have set errno appropriately.
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*/
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if (ret < 0)
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{
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err = -ret;
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goto errout;
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}
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/* Return the number of bytes actually sent */
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return state.snd_sent;
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errout:
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*get_errno_ptr() = err;
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return ERROR;
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}
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#endif /* CONFIG_NET */
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