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nuttx/net/send.c
patacongo 4c54d7d07e Add send() timeout logic 
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@420 42af7a65-404d-4744-a932-0658087f49c3
2007-12-02 15:11:32 +00:00

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/****************************************************************************
* 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>
#if defined(CONFIG_NET) && defined(CONFIG_NET_TCP)
#include <sys/types.h>
#include <sys/socket.h>
#include <string.h>
#include <errno.h>
#include <debug.h>
#include <arch/irq.h>
#include <net/uip/uip-arch.h>
#include "net-internal.h"
/****************************************************************************
* Definitions
****************************************************************************/
#define TCPBUF ((struct uip_tcpip_hdr *)&dev->d_buf[UIP_LLH_LEN])
/****************************************************************************
* 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 */
uint32 snd_isn; /* Initial sequence number */
uint32 snd_acked; /* The number of bytes acked */
#if defined(CONFIG_NET_SOCKOPTS) && !defined(CONFIG_DISABLE_CLOCK)
uint32 snd_time; /* last send time for determining timeout */
#endif
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Function: send_getisn
*
* Description:
* Get the next initial sequence number from the connection stucture
*
* Parameters:
* conn The connection structure associated with the socket
*
* Returned Value:
* None
*
* Assumptions:
* Running at the interrupt level
*
****************************************************************************/
static uint32 send_getisn(struct uip_conn *conn)
{
uint32 tmp;
memcpy(&tmp, conn->snd_nxt, 4);
return ntohl(tmp);
}
/****************************************************************************
* Function: send_getackno
*
* Description:
* Extract the current acknowledgement sequence number from the incoming packet
*
* Parameters:
* dev - The sructure of the network driver that caused the interrupt
*
* Returned Value:
* None
*
* Assumptions:
* Running at the interrupt level
*
****************************************************************************/
static uint32 send_getackno(struct uip_driver_s *dev)
{
uint32 tmp;
memcpy(&tmp, TCPBUF->ackno, 4);
return ntohl(tmp);
}
/****************************************************************************
* Function: send_timeout
*
* Description:
* Check for send timeout.
*
* Parameters:
* pstate send state structure
*
* Returned Value:
* TRUE:timeout FALSE:no timeout
*
* Assumptions:
* Running at the interrupt level
*
****************************************************************************/
#if defined(CONFIG_NET_SOCKOPTS) && !defined(CONFIG_DISABLE_CLOCK)
static inline int send_timeout(struct send_s *pstate)
{
FAR struct socket *psock = 0;
/* Check for a timeout configured via setsockopts(SO_SNDTIMEO).
* If none... we well let the send wait forever.
*/
psock = pstate->snd_sock;
if (psock && psock->s_sndtimeo != 0)
{
/* Check if the configured timeout has elapsed */
return net_timeo(pstate->snd_time, psock->s_sndtimeo);
}
/* No timeout */
return FALSE;
}
#endif /* CONFIG_NET_SOCKOPTS && !CONFIG_DISABLE_CLOCK */
/****************************************************************************
* 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
* conn The connection structure associated with the socket
* flags Set of events describing why the callback was invoked
*
* Returned Value:
* None
*
* Assumptions:
* Running at the interrupt level
*
****************************************************************************/
static uint8 send_interrupt(struct uip_driver_s *dev, struct uip_conn *conn,
uint8 flags)
{
struct send_s *pstate = (struct send_s *)conn->data_private;
nvdbg("flags: %02x state: %d\n", flags, pstate->snd_state);
/* If this packet contains an acknowledgement, then update the count of
* acknowldged bytes.
*/
if ((flags & UIP_ACKDATA) != 0)
{
/* The current acknowledgement number number is the (relative) offset
* of the 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.
*/
pstate->snd_acked = send_getackno(dev) - pstate->snd_isn;
nvdbg("ACK: acked=%d sent=%d buflen=%d\n",
pstate->snd_acked, pstate->snd_sent, pstate->snd_buflen);
/* Have all of the bytes in the buffer been sent and ACKed? */
if ( pstate->snd_acked >= pstate->snd_buflen)
{
/* Yes. Then pstate->snd_len should hold the number of bytes
* actually sent.
*/
goto end_wait;
}
/* No.. fall through to send more data if necessary */
}
/* Check if we are being asked to retransmit data */
else if ((flags & UIP_REXMIT) != 0)
{
/* Yes.. in this case, reset the number of bytes that have been sent
* to the number of bytes that have been ACKed.
*/
pstate->snd_sent = pstate->snd_acked;
/* Fall through to re-send data from the last that was ACKed */
}
/* Check for a loss of connection */
else if ((flags & (UIP_CLOSE|UIP_ABORT|UIP_TIMEDOUT)) != 0)
{
/* Report not connected */
nvdbg("Lost connection\n");
pstate->snd_sent = -ENOTCONN;
goto end_wait;
}
/* We get here if (1) not all of the data has been ACKed, (2) we have been
* asked to retransmit data, and (3) the connection is still healthy.
* We are now free to send more data to receiver.
*/
if (pstate->snd_sent < pstate->snd_buflen)
{
/* Get the amount of data that we can send in the next packet */
uint32 sndlen = pstate->snd_buflen - pstate->snd_sent;
if (sndlen > uip_mss(conn))
{
sndlen = uip_mss(conn);
}
/* Then send that amount of data */
uip_send(dev, &pstate->snd_buffer[pstate->snd_sent], sndlen);
/* And update the amount of data sent (but not necessarily ACKed) */
pstate->snd_sent += sndlen;
nvdbg("SEND: acked=%d sent=%d buflen=%d\n",
pstate->snd_acked, pstate->snd_sent, pstate->snd_buflen);
}
/* All data has been send and we are just waiting for ACK or re-tranmist
* indications to complete the send. Check for a timeout.
*/
#if defined(CONFIG_NET_SOCKOPTS) && !defined(CONFIG_DISABLE_CLOCK)
else if (send_timeout(pstate))
{
/* Yes.. report the timeout */
nvdbg("TCP timeout\n");
pstate->snd_sent = -EAGAIN;
goto end_wait;
}
#endif /* CONFIG_NET_SOCKOPTS && !CONFIG_DISABLE_CLOCK */
/* Continue waiting */
return flags;
end_wait:
/* Do not allow any further callbacks */
conn->data_flags = 0;
conn->data_private = NULL;
conn->data_event = NULL;
/* Wake up the waiting thread */
sem_post(&pstate->snd_sem);
return flags;
}
/****************************************************************************
* 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 = OK;
/* 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; /* Socket descriptor to use */
state.snd_buflen = len; /* Number of bytes to send */
state.snd_buffer = buf; /* Buffer to send from */
if (len > 0)
{
/* Get the initial sequence number that will be used */
conn = (struct uip_conn *)psock->s_conn;
state.snd_isn = send_getisn(conn); /* Initial sequence number */
/* Set up the callback in the connection */
conn->data_flags = UIP_REXMIT|UIP_ACKDATA|UIP_CLOSE|UIP_ABORT|UIP_TIMEDOUT;
conn->data_private = (void*)&state;
conn->data_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)
* 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_flags = 0;
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 && CONFIG_NET_TCP */
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