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nuttx/net/socket/net_poll.c

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/****************************************************************************
* net/socket/net_poll.c
*
* Copyright (C) 2008-2009, 2011-2015 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <errno.h>
#include "tcp/tcp.h"
#include "udp/udp.h"
#include "local/local.h"
#include "socket/socket.h"
#include "usrsock/usrsock.h"
#if defined(CONFIG_NET) && !defined(CONFIG_DISABLE_POLL)
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Network polling can only be supported if poll support is provided by TCP,
* UDP, or LOCAL sockets.
*/
#undef HAVE_NET_POLL
#if defined(HAVE_TCP_POLL) || defined(HAVE_UDP_POLL) || \
defined(HAVE_LOCAL_POLL) || defined(CONFIG_NET_USRSOCK)
# define HAVE_NET_POLL 1
#endif
#ifdef HAVE_NET_POLL
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: net_pollsetup
*
* Description:
* Setup to monitor events on one socket
*
* Input Parameters:
* psock - The socket of interest
* fds - The structure describing the events to be monitored, OR NULL if
* this is a request to stop monitoring events.
*
* Returned Value:
* 0: Success; Negated errno on failure
*
****************************************************************************/
static inline int net_pollsetup(FAR struct socket *psock,
FAR struct pollfd *fds)
{
#if defined(HAVE_TCP_POLL) || defined(HAVE_LOCAL_POLL)
if (psock->s_type == SOCK_STREAM)
{
#ifdef HAVE_LOCAL_POLL
#ifdef HAVE_TCP_POLL
if (psock->s_domain == PF_LOCAL)
#endif
{
return local_pollsetup(psock, fds);
}
#endif /* HAVE_LOCAL_POLL */
#ifdef HAVE_TCP_POLL
#ifdef HAVE_LOCAL_POLL
else
#endif
{
return tcp_pollsetup(psock, fds);
}
#endif /* HAVE_TCP_POLL */
}
#endif /* HAVE_TCP_POLL || HAVE_LOCAL_POLL */
#if defined(HAVE_UDP_POLL) || defined(HAVE_LOCAL_POLL)
if (psock->s_type != SOCK_STREAM)
{
#ifdef HAVE_LOCAL_POLL
#ifdef HAVE_UDP_POLL
if (psock->s_domain == PF_LOCAL)
#endif
{
return local_pollsetup(psock, fds);
}
#endif /* HAVE_LOCAL_POLL */
#ifdef HAVE_UDP_POLL
#ifdef HAVE_LOCAL_POLL
else
#endif
{
return udp_pollsetup(psock, fds);
}
#endif /* HAVE_UDP_POLL */
}
#endif /* HAVE_UDP_POLL || HAVE_LOCAL_POLL */
return -ENOSYS;
}
/****************************************************************************
* Name: net_pollteardown
*
* Description:
* Teardown monitoring of events on an socket
*
* Input Parameters:
* psock - The TCP/IP socket of interest
* fds - The structure describing the events to be monitored, OR NULL if
* this is a request to stop monitoring events.
*
* Returned Value:
* 0: Success; Negated errno on failure
*
****************************************************************************/
static inline int net_pollteardown(FAR struct socket *psock,
FAR struct pollfd *fds)
{
#if defined(HAVE_TCP_POLL) || defined(HAVE_LOCAL_POLL)
if (psock->s_type == SOCK_STREAM)
{
#ifdef HAVE_LOCAL_POLL
#ifdef HAVE_TCP_POLL
if (psock->s_domain == PF_LOCAL)
#endif
{
return local_pollteardown(psock, fds);
}
#endif /* HAVE_LOCAL_POLL */
#ifdef HAVE_TCP_POLL
#ifdef HAVE_LOCAL_POLL
else
#endif
{
return tcp_pollteardown(psock, fds);
}
#endif /* HAVE_TCP_POLL */
}
#endif /* HAVE_TCP_POLL || HAVE_LOCAL_POLL */
#if defined(HAVE_UDP_POLL) || defined(HAVE_LOCAL_POLL)
if (psock->s_type != SOCK_STREAM)
{
#ifdef HAVE_LOCAL_POLL
#ifdef HAVE_UDP_POLL
if (psock->s_domain == PF_LOCAL)
#endif
{
return local_pollteardown(psock, fds);
}
#endif /* HAVE_LOCAL_POLL */
#ifdef HAVE_UDP_POLL
#ifdef HAVE_LOCAL_POLL
else
#endif
{
return udp_pollteardown(psock, fds);
}
#endif /* HAVE_UDP_POLL */
}
#endif /* HAVE_UDP_POLL || HAVE_LOCAL_POLL */
return -ENOSYS;
}
#endif /* HAVE_NET_POLL */
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: psock_poll
*
* Description:
* The standard poll() operation redirects operations on socket descriptors
* to this function.
*
* Input Parameters:
* psock - An instance of the internal socket structure.
* fds - The structure describing the events to be monitored, OR NULL if
* this is a request to stop monitoring events.
* setup - true: Setup up the poll; false: Teardown the poll
*
* Returned Value:
* 0: Success; Negated errno on failure
*
****************************************************************************/
int psock_poll(FAR struct socket *psock, FAR struct pollfd *fds, bool setup)
{
#ifndef HAVE_NET_POLL
return -ENOSYS;
#else
int ret;
#ifdef CONFIG_NET_USRSOCK
if (psock->s_type == SOCK_USRSOCK_TYPE)
{
/* Perform usrsock setup/teardown. */
return usrsock_poll(psock, fds, setup);
}
#endif
/* Check if we are setting up or tearing down the poll */
if (setup)
{
/* Perform the TCP/IP poll() setup */
ret = net_pollsetup(psock, fds);
}
else
{
/* Perform the TCP/IP poll() teardown */
ret = net_pollteardown(psock, fds);
}
return ret;
#endif /* HAVE_NET_POLL */
}
/****************************************************************************
* Name: net_poll
*
* Description:
* The standard poll() operation redirects operations on socket descriptors
* to this function.
*
* Input Parameters:
* fd - The socket descriptor of interest
* fds - The structure describing the events to be monitored, OR NULL if
* this is a request to stop monitoring events.
* setup - true: Setup up the poll; false: Teardown the poll
*
* Returned Value:
* 0: Success; Negated errno on failure
*
****************************************************************************/
int net_poll(int sockfd, struct pollfd *fds, bool setup)
{
#ifndef HAVE_NET_POLL
return -ENOSYS;
#else
FAR struct socket *psock;
/* Get the underlying socket structure and verify that the sockfd
* corresponds to valid, allocated socket
*/
psock = sockfd_socket(sockfd);
if (!psock || psock->s_crefs <= 0)
{
return -EBADF;
}
/* Then let psock_poll() do the heavy lifting */
return psock_poll(psock, fds, setup);
#endif /* HAVE_NET_POLL */
}
#endif /* CONFIG_NET && !CONFIG_DISABLE_POLL */
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