/**************************************************************************** * 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 #include #include #include #include #include #include #include #include #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; }