forked from Archive/PX4-Autopilot
89 lines
3.4 KiB
C
89 lines
3.4 KiB
C
/****************************************************************************
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* net/net_checksd.c
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*
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* Copyright (C) 2011 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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 <sys/socket.h>
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#include <sched.h>
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#include <errno.h>
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#include <debug.h>
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#include "net_internal.h"
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/****************************************************************************
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* Global Functions
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****************************************************************************/
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/****************************************************************************
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* Name: net_checksd
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*
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* Description:
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* Check if the socket descriptor is valid for the provided TCB and if it
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* supports the requested access. This trivial operation is part of the
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* fdopen() operation when the fdopen() is performed on a socket descriptor.
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* It simply performs some sanity checking before permitting the socket
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* descriptor to be wrapped as a C FILE stream.
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*
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****************************************************************************/
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#if defined(CONFIG_NET) && CONFIG_NFILE_DESCRIPTORS > 0
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int net_checksd(int sd, int oflags)
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{
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FAR struct socket *psock = sockfd_socket(sd);
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/* Verify that the sockfd corresponds to valid, allocated socket */
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if (!psock || psock->s_crefs <= 0)
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{
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nvdbg("No valid socket for sd: %d\n", sd);
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return -EBADF;
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}
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/* NOTE: We permit the socket FD to be "wrapped" in a stream as
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* soon as the socket descriptor is created by socket(). Therefore
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* (1) we don't care if the socket is connected yet, and (2) there
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* are no access restrictions that can be enforced yet.
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*/
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return OK;
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}
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#endif /* CONIG_NET && CONFIG_NFILE_DESCRIPTORS > 0 */
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