![patacongo](/assets/img/avatar_default.png)
git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@4450 7fd9a85b-ad96-42d3-883c-3090e2eb8679
441 lines
14 KiB
C
441 lines
14 KiB
C
/****************************************************************************
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* net/sendto.c
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*
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* Copyright (C) 2007-2009, 2011-2012 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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 <stdint.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 <nuttx/net/uip/uip-arch.h>
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#include "net_internal.h"
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#include "uip/uip_internal.h"
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/****************************************************************************
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* Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Types
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****************************************************************************/
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struct sendto_s
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{
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FAR struct uip_callback_s *st_cb; /* Reference to callback instance */
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sem_t st_sem; /* Semaphore signals sendto completion */
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uint16_t st_buflen; /* Length of send buffer (error if <0) */
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const char *st_buffer; /* Pointer to send buffer */
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int st_sndlen; /* Result of the send (length sent or negated errno) */
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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: sendto_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 An instance of the UDP connection structure cast to void *
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* pvpriv An instance of struct sendto_s cast to void*
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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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* Modified value of the input flags
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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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#ifdef CONFIG_NET_UDP
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static uint16_t sendto_interrupt(struct uip_driver_s *dev, void *conn,
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void *pvpriv, uint16_t flags)
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{
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struct sendto_s *pstate = (struct sendto_s *)pvpriv;
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nllvdbg("flags: %04x\n", flags);
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if (pstate)
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{
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/* Check if the outgoing packet is available (it may have been claimed
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* by a sendto interrupt serving a different thread -OR- if the output
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* buffer currently contains unprocessed incoming data. In these cases
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* we will just have to wait for the next polling cycle.
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*/
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if (dev->d_sndlen > 0 || (flags & UIP_NEWDATA) != 0)
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{
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/* Another thread has beat us sending data or the buffer is busy,
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* wait for the next polling cycle
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*/
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return flags;
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}
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/* It looks like we are good to send the data */
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else
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{
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/* Copy the user data into d_snddata and send it */
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uip_send(dev, pstate->st_buffer, pstate->st_buflen);
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pstate->st_sndlen = pstate->st_buflen;
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}
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/* Don't allow any further call backs. */
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pstate->st_cb->flags = 0;
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pstate->st_cb->priv = NULL;
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pstate->st_cb->event = NULL;
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/* Wake up the waiting thread */
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sem_post(&pstate->st_sem);
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}
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return flags;
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}
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#endif
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/****************************************************************************
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* Global Functions
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****************************************************************************/
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/****************************************************************************
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* Function: psock_sendto
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*
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* Description:
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* If sendto() is used on a connection-mode (SOCK_STREAM, SOCK_SEQPACKET)
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* socket, the parameters to and 'tolen' are ignored (and the error EISCONN
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* may be returned when they are not NULL and 0), and the error ENOTCONN is
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* returned when the socket was not actually connected.
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*
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* Parameters:
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* psock A pointer to a NuttX-specific, internal socket structure
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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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* to Address of recipient
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* tolen The length of the address structure
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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 psock_sendto(FAR struct socket *psock, FAR const void *buf,
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size_t len, int flags, FAR const struct sockaddr *to,
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socklen_t tolen)
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{
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#ifdef CONFIG_NET_UDP
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FAR struct uip_udp_conn *conn;
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#ifdef CONFIG_NET_IPv6
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FAR const struct sockaddr_in6 *into = (const struct sockaddr_in6 *)to;
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#else
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FAR const struct sockaddr_in *into = (const struct sockaddr_in *)to;
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#endif
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struct sendto_s state;
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uip_lock_t save;
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int ret;
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#endif
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int err;
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/* If to is NULL or tolen is zero, then this function is same as send (for
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* connected socket types)
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*/
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if (!to || !tolen)
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{
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#ifdef CONFIG_NET_TCP
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return psock_send(psock, buf, len, flags);
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#else
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err = EINVAL;
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goto errout;
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#endif
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}
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/* Verify that a valid address has been provided */
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#ifdef CONFIG_NET_IPv6
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if (to->sa_family != AF_INET6 || tolen < sizeof(struct sockaddr_in6))
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#else
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if (to->sa_family != AF_INET || tolen < sizeof(struct sockaddr_in))
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#endif
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{
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err = EBADF;
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goto errout;
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}
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/* Verify that the psock 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 EISCONN */
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if (psock->s_type != SOCK_DGRAM)
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{
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err = EISCONN;
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goto errout;
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}
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/* Perform the UDP sendto operation */
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#ifdef CONFIG_NET_UDP
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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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/* 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 = uip_lock();
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memset(&state, 0, sizeof(struct sendto_s));
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sem_init(&state.st_sem, 0, 0);
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state.st_buflen = len;
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state.st_buffer = buf;
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/* Setup the UDP socket */
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conn = (struct uip_udp_conn *)psock->s_conn;
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ret = uip_udpconnect(conn, into);
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if (ret < 0)
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{
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uip_unlock(save);
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err = -ret;
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goto errout;
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}
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/* Set up the callback in the connection */
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state.st_cb = uip_udpcallbackalloc(conn);
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if (state.st_cb)
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{
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state.st_cb->flags = UIP_POLL;
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state.st_cb->priv = (void*)&state;
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state.st_cb->event = sendto_interrupt;
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/* Enable the UDP socket */
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uip_udpenable(conn);
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/* Notify the device driver of the availabilty of TX data */
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netdev_txnotify(&conn->ripaddr);
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/* Wait for either the receive to complete or for an error/timeout to occur.
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* NOTES: (1) uip_lockedwait will also terminate if a signal is received, (2)
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* interrupts may be disabled! They will be re-enabled while the task sleeps
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* and automatically re-enabled when the task restarts.
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*/
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uip_lockedwait(&state.st_sem);
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/* Make sure that no further interrupts are processed */
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uip_udpdisable(conn);
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uip_udpcallbackfree(conn, state.st_cb);
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}
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uip_unlock(save);
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sem_destroy(&state.st_sem);
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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 errors */
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if (state.st_sndlen < 0)
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{
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err = -state.st_sndlen;
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goto errout;
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}
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/* Sucess */
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return state.st_sndlen;
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#else
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err = ENOSYS;
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#endif
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errout:
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errno = err;
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return ERROR;
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}
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/****************************************************************************
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* Function: sendto
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*
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* Description:
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* If sendto() is used on a connection-mode (SOCK_STREAM, SOCK_SEQPACKET)
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* socket, the parameters to and 'tolen' are ignored (and the error EISCONN
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* may be returned when they are not NULL and 0), and the error ENOTCONN is
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* returned when the socket was not actually connected.
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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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* to Address of recipient
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* tolen The length of the address structure
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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 sendto(int sockfd, FAR const void *buf, size_t len, int flags,
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FAR const struct sockaddr *to, socklen_t tolen)
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{
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FAR struct socket *psock;
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/* Get the underlying socket structure */
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psock = sockfd_socket(sockfd);
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/* And let psock_sendto do all of the work */
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return psock_sendto(psock, buf, len, flags, to, tolen);
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}
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#endif /* CONFIG_NET */
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