156 lines
4.5 KiB
C
156 lines
4.5 KiB
C
/****************************************************************************
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* net/local/local_sendpacket.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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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#include <sys/types.h>
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#include <stdint.h>
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#include <unistd.h>
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#include <errno.h>
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#include <assert.h>
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#include <debug.h>
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#include <nuttx/fs/fs.h>
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#include "devif/devif.h"
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#include "local/local.h"
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#if defined(CONFIG_NET) && defined(CONFIG_NET_LOCAL)
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define LOCAL_PREAMBLE_SIZE 8
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static const uint8_t g_preamble[LOCAL_PREAMBLE_SIZE] =
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{
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LOCAL_SYNC_BYTE, LOCAL_SYNC_BYTE, LOCAL_SYNC_BYTE, LOCAL_SYNC_BYTE,
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LOCAL_SYNC_BYTE, LOCAL_SYNC_BYTE, LOCAL_SYNC_BYTE, LOCAL_END_BYTE
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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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* Name: local_fifo_write
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*
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* Description:
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* Write a data on the write-only FIFO.
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*
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* Input Parameters:
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* filep File structure of write-only FIFO.
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* buf Data to send
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* len Length of data to send
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*
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* Returned Value:
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* Zero is returned on success; a negated errno value is returned on any
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* failure.
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*
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****************************************************************************/
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static int local_fifo_write(FAR struct file *filep, FAR const uint8_t *buf,
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size_t len)
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{
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ssize_t nwritten;
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while (len > 0)
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{
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nwritten = file_write(filep, buf, len);
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if (nwritten < 0)
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{
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if (nwritten != -EINTR)
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{
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nerr("ERROR: file_write failed: %zd\n", nwritten);
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return (int)nwritten;
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}
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ninfo("Ignoring signal\n");
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}
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else
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{
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DEBUGASSERT(nwritten > 0 && nwritten <= len);
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len -= nwritten;
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buf += nwritten;
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}
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}
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return OK;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: local_send_packet
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*
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* Description:
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* Send a packet on the write-only FIFO.
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*
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* Input Parameters:
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* filep File structure of write-only FIFO.
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* buf Data to send
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* len Length of data to send
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*
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* Returned Value:
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* Zero is returned on success; a negated errno value is returned on any
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* failure.
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*
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****************************************************************************/
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int local_send_packet(FAR struct file *filep, FAR const uint8_t *buf,
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size_t len)
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{
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uint16_t len16;
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int ret;
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/* Send the packet preamble */
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ret = local_fifo_write(filep, g_preamble, LOCAL_PREAMBLE_SIZE);
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if (ret == OK)
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{
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/* Send the packet length */
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len16 = len;
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ret = local_fifo_write(filep, (FAR const uint8_t *)&len16,
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sizeof(uint16_t));
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if (ret == OK)
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{
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/* Send the packet data */
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ret = local_fifo_write(filep, buf, len);
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}
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}
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return ret;
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}
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#endif /* CONFIG_NET && CONFIG_NET_LOCAL */
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