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- /****************************************************************************
- * net/local/local_sendpacket.c
- *
- * Copyright (C) 2015, 2017 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 <stdint.h>
- #include <unistd.h>
- #include <errno.h>
- #include <assert.h>
- #include <debug.h>
- #include <nuttx/fs/fs.h>
- #include "devif/devif.h"
- #include "local/local.h"
- #if defined(CONFIG_NET) && defined(CONFIG_NET_LOCAL)
- /****************************************************************************
- * Pre-processor Definitions
- ****************************************************************************/
- #define LOCAL_PREAMBLE_SIZE 8
- /****************************************************************************
- * Private Data
- ****************************************************************************/
- static const uint8_t g_preamble[LOCAL_PREAMBLE_SIZE] =
- {
- LOCAL_SYNC_BYTE, LOCAL_SYNC_BYTE, LOCAL_SYNC_BYTE, LOCAL_SYNC_BYTE,
- LOCAL_SYNC_BYTE, LOCAL_SYNC_BYTE, LOCAL_SYNC_BYTE, LOCAL_END_BYTE
- };
- /****************************************************************************
- * Private Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: local_fifo_write
- *
- * Description:
- * Write a data on the write-only FIFO.
- *
- * Input Parameters:
- * filep File structure of write-only FIFO.
- * buf Data to send
- * len Length of data to send
- *
- * Returned Value:
- * Zero is returned on success; a negated errno value is returned on any
- * failure.
- *
- ****************************************************************************/
- static int local_fifo_write(FAR struct file *filep, FAR const uint8_t *buf,
- size_t len)
- {
- ssize_t nwritten;
- while (len > 0)
- {
- nwritten = file_write(filep, buf, len);
- if (nwritten < 0)
- {
- if (nwritten != -EINTR)
- {
- nerr("ERROR: nx_write failed: %d\n", nwritten);
- return (int)nwritten;
- }
- ninfo("Ignoring signal\n");
- }
- else
- {
- DEBUGASSERT(nwritten > 0 && nwritten <= len);
- len -= nwritten;
- buf += nwritten;
- }
- }
- return OK;
- }
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: local_send_packet
- *
- * Description:
- * Send a packet on the write-only FIFO.
- *
- * Input Parameters:
- * filep File structure of write-only FIFO.
- * buf Data to send
- * len Length of data to send
- *
- * Returned Value:
- * Zero is returned on success; a negated errno value is returned on any
- * failure.
- *
- ****************************************************************************/
- int local_send_packet(FAR struct file *filep, FAR const uint8_t *buf,
- size_t len)
- {
- uint16_t len16;
- int ret;
- /* Send the packet preamble */
- ret = local_fifo_write(filep, g_preamble, LOCAL_PREAMBLE_SIZE);
- if (ret == OK)
- {
- /* Send the packet length */
- len16 = len;
- ret = local_fifo_write(filep, (FAR const uint8_t *)&len16,
- sizeof(uint16_t));
- if (ret == OK)
- {
- /* Send the packet data */
- ret = local_fifo_write(filep, buf, len);
- }
- }
- return ret;
- }
- #endif /* CONFIG_NET && CONFIG_NET_LOCAL */
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