aa8343178b
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@346 42af7a65-404d-4744-a932-0658087f49c3
353 lines
11 KiB
C
353 lines
11 KiB
C
/****************************************************************************
|
|
* net/send.c
|
|
*
|
|
* Copyright (C) 2007 Gregory Nutt. All rights reserved.
|
|
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in
|
|
* the documentation and/or other materials provided with the
|
|
* distribution.
|
|
* 3. Neither the name NuttX nor the names of its contributors may be
|
|
* used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
|
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
|
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
|
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
|
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
#ifdef CONFIG_NET
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/socket.h>
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
#include <arch/irq.h>
|
|
|
|
#include "net-internal.h"
|
|
|
|
/****************************************************************************
|
|
* Definitions
|
|
****************************************************************************/
|
|
|
|
#define STATE_POLLWAIT 1
|
|
#define STATE_DATA_SENT 2
|
|
|
|
/****************************************************************************
|
|
* Private Types
|
|
****************************************************************************/
|
|
|
|
/* This structure holds the state of the send operation until it can be
|
|
* operated upon from the interrupt level.
|
|
*/
|
|
|
|
struct send_s
|
|
{
|
|
FAR struct socket *snd_sock; /* Points to the parent socket structure */
|
|
sem_t snd_sem; /* Used to wake up the waiting thread */
|
|
FAR const uint8 *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 */
|
|
uint8 snd_state; /* The state of the send operation. */
|
|
};
|
|
|
|
/****************************************************************************
|
|
* Private Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Function: send_interrupt
|
|
*
|
|
* Description:
|
|
* This function is called from the interrupt level to perform the actual
|
|
* send operation when polled by the uIP layer.
|
|
*
|
|
* Parameters:
|
|
* dev The sructure of the network driver that caused the interrupt
|
|
* private An instance of struct send_s cast to void*
|
|
*
|
|
* Returned Value:
|
|
* None
|
|
*
|
|
* Assumptions:
|
|
* Running at the interrupt level
|
|
*
|
|
****************************************************************************/
|
|
|
|
static void send_interrupt(struct uip_driver_s *dev, void *private)
|
|
{
|
|
struct send_s *pstate = (struct send_s *)private;
|
|
struct uip_conn *conn;
|
|
|
|
/* If the data has not been sent OR if it needs to be retransmitted,
|
|
* then send it now.
|
|
*/
|
|
|
|
if (pstate->snd_state != STATE_DATA_SENT || uip_rexmit())
|
|
{
|
|
if (pstate->snd_buflen > uip_mss())
|
|
{
|
|
uip_send(dev, pstate->snd_buffer, uip_mss());
|
|
}
|
|
else
|
|
{
|
|
uip_send(dev, pstate->snd_buffer, pstate->snd_buflen);
|
|
}
|
|
|
|
pstate->snd_state = STATE_DATA_SENT;
|
|
}
|
|
|
|
/* Check if all data has been sent and acknowledged */
|
|
|
|
else if (pstate->snd_state == STATE_DATA_SENT && uip_acked())
|
|
{
|
|
/* Yes.. the data has been sent AND acknowledge */
|
|
|
|
if (pstate->snd_buflen > uip_mss())
|
|
{
|
|
/* Not all data has been sent */
|
|
|
|
pstate->snd_sent += uip_mss();
|
|
pstate->snd_buflen -= uip_mss();
|
|
pstate->snd_buffer += uip_mss();
|
|
|
|
/* Send again on the next poll */
|
|
|
|
pstate->snd_state = STATE_POLLWAIT;
|
|
}
|
|
else
|
|
{
|
|
/* All data has been sent */
|
|
|
|
pstate->snd_sent += pstate->snd_buflen;
|
|
pstate->snd_buffer += pstate->snd_buflen;
|
|
pstate->snd_buflen = 0;
|
|
|
|
/* Don't allow any further call backs. */
|
|
|
|
conn = (struct uip_conn *)pstate->snd_sock->s_conn;
|
|
conn->data_private = NULL;
|
|
conn->data_event = NULL;
|
|
|
|
/* Wake up the waiting thread, returning the number of bytes
|
|
* actually sent.
|
|
*/
|
|
|
|
sem_post(&pstate->snd_sem);
|
|
}
|
|
}
|
|
|
|
/* Check for a loss of connection */
|
|
|
|
else if ((uip_flags & (UIP_CLOSE|UIP_ABORT|UIP_TIMEDOUT)) != 0)
|
|
{
|
|
/* Stop further callbacks */
|
|
|
|
conn = (struct uip_conn *)pstate->snd_sock->s_conn;
|
|
conn->data_private = NULL;
|
|
conn->data_event = NULL;
|
|
|
|
/* Report not connected */
|
|
|
|
pstate->snd_sent = -ENOTCONN;
|
|
|
|
/* Wake up the waiting thread */
|
|
|
|
sem_post(&pstate->snd_sem);
|
|
}
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Function: send
|
|
*
|
|
* Description:
|
|
* The send() call may be used only when the socket is in a connected state
|
|
* (so that the intended recipient is known). The only difference between
|
|
* send() and write() is the presence of flags. With zero flags parameter,
|
|
* send() is equivalent to write(). Also, send(sockfd,buf,len,flags) is
|
|
* equivalent to sendto(sockfd,buf,len,flags,NULL,0).
|
|
*
|
|
* Parameters:
|
|
* sockfd Socket descriptor of socket
|
|
* 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,
|
|
* -1 is returned, and errno is set appropriately:
|
|
*
|
|
* 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.
|
|
* EOPNOTSUPP
|
|
* Some bit in the flags argument is inappropriate for the socket
|
|
* type.
|
|
* 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.
|
|
*
|
|
* Assumptions:
|
|
*
|
|
****************************************************************************/
|
|
|
|
ssize_t send(int sockfd, const void *buf, size_t len, int flags)
|
|
{
|
|
FAR struct socket *psock = sockfd_socket(sockfd);
|
|
struct uip_conn *conn;
|
|
struct send_s state;
|
|
irqstate_t save;
|
|
int err;
|
|
int ret;
|
|
|
|
/* Verify that the sockfd corresponds to valid, allocated socket */
|
|
|
|
if (!psock || psock->s_crefs <= 0)
|
|
{
|
|
err = EBADF;
|
|
goto errout;
|
|
}
|
|
|
|
/* If this is a 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 = irqsave();
|
|
memset(&state, 0, sizeof(struct send_s));
|
|
(void)sem_init(&state. snd_sem, 0, 0); /* Doesn't really fail */
|
|
state.snd_sock = psock;
|
|
state.snd_buflen = len;
|
|
state.snd_buffer = buf;
|
|
state.snd_state = STATE_POLLWAIT;
|
|
|
|
if (len > 0)
|
|
{
|
|
/* Set up the callback in the connection */
|
|
|
|
conn = (struct uip_conn *)psock->s_conn;
|
|
conn->data_private = (void*)&state;
|
|
conn->data_event = send_interrupt;
|
|
|
|
/* Wait for the send to complete or an error to occur: NOTES: (1)
|
|
* sem_wait will also terminate if a signal is received, (2) interrupts
|
|
* are disabled! They will be re-enabled while the task sleeps and
|
|
* automatically re-enabled when the task restarts.
|
|
*/
|
|
|
|
ret = sem_wait(&state. snd_sem);
|
|
|
|
/* Make sure that no further interrupts are processed */
|
|
|
|
conn->data_private = NULL;
|
|
conn->data_event = NULL;
|
|
}
|
|
|
|
sem_destroy(&state. snd_sem);
|
|
irqrestore(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 sem_wait failed, then we were probably reawakened by a signal. In
|
|
* this case, sem_wait 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;
|
|
}
|
|
|
|
#endif /* CONFIG_NET */
|