165 lines
4.5 KiB
C
165 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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/****************************************************************************
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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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* On success, the number of bytes written are returned (zero indicates
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* nothing was written). On any failure, a negated errno value is returned
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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 = 0;
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ssize_t ret = 0;
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while (len != nwritten)
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{
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ret = file_write(filep, buf + nwritten, len - nwritten);
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if (ret < 0)
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{
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if (ret == -EINTR)
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{
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continue;
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}
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else if (ret == -EAGAIN)
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{
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break;
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}
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else
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{
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nerr("ERROR: file_write failed: %zd\n", ret);
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break;
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}
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}
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nwritten += ret;
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}
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return nwritten > 0 ? nwritten : ret;
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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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* preamble Flag to indicate the preamble sync header assembly
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*
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* Returned Value:
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* Packet length is returned on success; a negated errno value is returned
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* on any failure.
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*
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****************************************************************************/
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int local_send_packet(FAR struct file *filep, FAR const struct iovec *buf,
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size_t len, bool preamble)
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{
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FAR const struct iovec *end = buf + len;
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FAR const struct iovec *iov;
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int ret = -EINVAL;
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uint16_t len16;
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if (preamble)
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{
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/* Send the packet length */
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for (len16 = 0, iov = buf; iov != end; iov++)
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{
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len16 += iov->iov_len;
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}
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if (len16 > LOCAL_SEND_LIMIT)
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{
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nerr("ERROR: Packet is too big: %d\n", len16);
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return -EMSGSIZE;
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}
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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 != sizeof(uint16_t))
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{
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return ret;
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}
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}
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for (len16 = 0, iov = buf; iov != end; iov++)
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{
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ret = local_fifo_write(filep, iov->iov_base, iov->iov_len);
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if (ret < 0)
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{
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break;
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}
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if (ret > 0)
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{
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len16 += ret;
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if (ret != iov->iov_len)
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{
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break;
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}
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}
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}
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return len16 > 0 ? len16 : ret;
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}
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