292 lines
7.4 KiB
C
292 lines
7.4 KiB
C
/****************************************************************************
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* net/udp/udp_netpoll.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 <stdint.h>
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#include <assert.h>
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#include <poll.h>
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#include <debug.h>
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#include <nuttx/net/net.h>
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#include <nuttx/semaphore.h>
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#include "devif/devif.h"
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#include "netdev/netdev.h"
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#include "socket/socket.h"
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#include "udp/udp.h"
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: udp_poll_eventhandler
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*
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* Description:
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* This function is called to perform the actual UDP receive operation
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* via the device interface layer.
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*
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* Input Parameters:
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* dev The structure of the network driver that caused the event
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* pvpriv An instance of struct udp_poll_s cast to void*
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* flags Set of events describing why the callback was invoked
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*
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* Returned Value:
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* None
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*
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* Assumptions:
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* This function must be called with the network locked.
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*
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****************************************************************************/
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static uint16_t udp_poll_eventhandler(FAR struct net_driver_s *dev,
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FAR void *pvpriv, uint16_t flags)
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{
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FAR struct udp_poll_s *info = pvpriv;
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ninfo("flags: %04x\n", flags);
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DEBUGASSERT(!info || (info->conn && info->fds));
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/* 'priv' might be null in some race conditions (?) */
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if (info)
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{
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pollevent_t eventset = 0;
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/* Check for data or connection availability events. */
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if ((flags & UDP_NEWDATA) != 0)
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{
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eventset |= POLLIN;
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}
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/* Check for loss of connection events. */
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if ((flags & NETDEV_DOWN) != 0)
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{
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eventset |= (POLLHUP | POLLERR);
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}
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/* A poll is a sign that we are free to send data. */
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else if (psock_udp_cansend(info->conn) >= 0)
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{
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eventset |= POLLOUT;
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}
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/* Awaken the caller of poll() is requested event occurred. */
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poll_notify(&info->fds, 1, eventset);
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}
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return flags;
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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: udp_pollsetup
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*
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* Description:
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* Setup to monitor events on one UDP/IP socket
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*
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* Input Parameters:
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* psock - The UDP/IP socket of interest
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* fds - The structure describing the events to be monitored, OR NULL if
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* this is a request to stop monitoring events.
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*
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* Returned Value:
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* 0: Success; Negated errno on failure
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*
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****************************************************************************/
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int udp_pollsetup(FAR struct socket *psock, FAR struct pollfd *fds)
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{
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FAR struct udp_conn_s *conn;
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FAR struct udp_poll_s *info;
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FAR struct devif_callback_s *cb;
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pollevent_t eventset = 0;
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int ret = OK;
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/* Some of the following must be atomic */
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net_lock();
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conn = psock->s_conn;
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/* Sanity check */
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if (conn == NULL || fds == NULL)
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{
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ret = -EINVAL;
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goto errout_with_lock;
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}
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/* Find a container to hold the poll information */
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info = conn->pollinfo;
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while (info->conn != NULL)
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{
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if (++info >= &conn->pollinfo[CONFIG_NET_UDP_NPOLLWAITERS])
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{
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ret = -ENOMEM;
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goto errout_with_lock;
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}
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}
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/* Get the device that will provide the provide the NETDEV_DOWN event.
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* NOTE: in the event that the local socket is bound to INADDR_ANY, the
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* dev value will be zero and there will be no NETDEV_DOWN notifications.
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*/
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info->dev = udp_find_laddr_device(conn);
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/* Allocate a UDP callback structure */
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cb = udp_callback_alloc(info->dev, conn);
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if (cb == NULL)
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{
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ret = -EBUSY;
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goto errout_with_lock;
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}
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/* Initialize the poll info container */
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info->conn = conn;
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info->fds = fds;
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info->cb = cb;
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/* Initialize the callback structure. Save the reference to the info
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* structure as callback private data so that it will be available during
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* callback processing.
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*/
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cb->flags = NETDEV_DOWN;
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cb->priv = info;
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cb->event = udp_poll_eventhandler;
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if ((fds->events & POLLOUT) != 0)
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{
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cb->flags |= UDP_POLL;
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}
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if ((fds->events & POLLIN) != 0)
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{
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cb->flags |= UDP_NEWDATA;
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}
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/* Save the reference in the poll info structure as fds private as well
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* for use during poll teardown as well.
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*/
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fds->priv = info;
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/* Check for read data availability now */
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if (conn->readahead != NULL)
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{
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/* Normal data may be read without blocking. */
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eventset |= POLLRDNORM;
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}
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if (psock_udp_cansend(conn) >= 0)
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{
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/* Normal data may be sent without blocking (at least one byte). */
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eventset |= POLLWRNORM;
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}
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/* Check if any requested events are already in effect */
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poll_notify(&fds, 1, eventset);
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errout_with_lock:
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net_unlock();
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return ret;
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}
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/****************************************************************************
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* Name: udp_pollteardown
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*
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* Description:
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* Teardown monitoring of events on an UDP/IP socket
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*
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* Input Parameters:
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* psock - The UDP socket of interest
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* fds - The structure describing the events to be monitored, OR NULL if
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* this is a request to stop monitoring events.
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*
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* Returned Value:
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* 0: Success; Negated errno on failure
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*
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****************************************************************************/
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int udp_pollteardown(FAR struct socket *psock, FAR struct pollfd *fds)
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{
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FAR struct udp_conn_s *conn;
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FAR struct udp_poll_s *info;
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/* Some of the following must be atomic */
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net_lock();
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conn = psock->s_conn;
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/* Sanity check */
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if (!conn || !fds->priv)
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{
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net_unlock();
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return -EINVAL;
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}
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/* Recover the socket descriptor poll state info from the poll structure */
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info = (FAR struct udp_poll_s *)fds->priv;
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DEBUGASSERT(info->fds != NULL && info->cb != NULL);
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if (info != NULL)
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{
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/* Release the callback */
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udp_callback_free(info->dev, conn, info->cb);
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/* Release the poll/select data slot */
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info->fds->priv = NULL;
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/* Then free the poll info container */
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info->conn = NULL;
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}
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net_unlock();
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return OK;
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}
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