nuttx/net/tcp/tcp_ioctl.c

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/****************************************************************************
* net/tcp/tcp_ioctl.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <stdbool.h>
#include <debug.h>
#include <errno.h>
#include <net/if.h>
#include <nuttx/fs/ioctl.h>
#include <nuttx/mm/iob.h>
#include <nuttx/net/net.h>
#include "tcp/tcp.h"
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: tcp_ioctl
*
* Description:
* This function performs tcp specific ioctl() operations.
*
* Parameters:
* conn The TCP connection of interest
* cmd The ioctl command
* arg The argument of the ioctl cmd
* arglen The length of 'arg'
*
****************************************************************************/
int tcp_ioctl(FAR struct tcp_conn_s *conn,
int cmd, FAR void *arg, size_t arglen)
{
int ret = OK;
net_lock();
switch (cmd)
{
case FIONREAD:
if (conn->readahead != NULL)
{
*(FAR int *)((uintptr_t)arg) = conn->readahead->io_pktlen;
}
else
{
*(FAR int *)((uintptr_t)arg) = 0;
}
break;
case FIONSPACE:
#ifdef CONFIG_NET_TCP_WRITE_BUFFERS
# if CONFIG_NET_SEND_BUFSIZE == 0
*(FAR int *)((uintptr_t)arg) =
iob_navail(true) * CONFIG_IOB_BUFSIZE;
# else
*(FAR int *)((uintptr_t)arg) =
conn->snd_bufs - tcp_wrbuffer_inqueue_size(conn);
# endif
#else
*(FAR int *)((uintptr_t)arg) = MIN_TCP_MSS;
#endif
break;
default:
ret = -ENOTTY;
break;
}
net_unlock();
return ret;
}