nuttx/net/udp/udp_psock_send.c

/****************************************************************************
 * net/udp/udp_psock_send.c
 *
 *   Copyright (C) 2015, 2018 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *
 * 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>

#include <sys/types.h>
#include <assert.h>
#include <errno.h>

#include <nuttx/net/net.h>

#include "socket/socket.h"
#include "udp/udp.h"

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: psock_udp_send
 *
 * Description:
 *   Implements send() for connected UDP sockets
 *
 ****************************************************************************/

ssize_t psock_udp_send(FAR struct socket *psock, FAR const void *buf,
                       size_t len)
{
  DEBUGASSERT(psock != NULL && psock->s_crefs > 0 && psock->s_conn != NULL);
  DEBUGASSERT(psock->s_type == SOCK_DGRAM);

  /* Was the UDP socket connected via connect()?
   * REVISIT:  This same test is performed in psock_udp_sendto() where
   * -EDESTADDRREQ is returned.  There is a fine distinction in the
   * meaning of the reported errors that I am not sure I have correct.
   */

  if (!_SS_ISCONNECTED(psock->s_flags))
    {
      /* No, then it is not legal to call send() with this socket.
       * ENOTCONN - The socket is not connected or otherwise has not had
       * the peer pre-specified.
       */

      return -ENOTCONN;
    }

  /* Let psock_sendto() do all of the work work */

  return psock_udp_sendto(psock, buf, len, 0, NULL, 0);
}