/**************************************************************************** * net/socket/net_poll.c * * Copyright (C) 2008-2009, 2011-2015 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * 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 #include #include "tcp/tcp.h" #include "udp/udp.h" #include "local/local.h" #include "socket/socket.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) # define HAVE_NET_POLL 1 #endif #ifdef HAVE_NET_POLL /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Function: 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; } /**************************************************************************** * Function: 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 ****************************************************************************/ /**************************************************************************** * Function: 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; /* 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 */ } /**************************************************************************** * Function: 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 */