110 lines
3.9 KiB
C
110 lines
3.9 KiB
C
/****************************************************************************
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* fs/fs_dup2.c
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*
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* Copyright (C) 2007-2009, 2011, 2013 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 <unistd.h>
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#include <sched.h>
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#include <errno.h>
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#include "fs_internal.h"
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/* This logic in this applies only when both socket and file descriptors are
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* in that case, this function descriminates which type of dup2 is being
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* performed.
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*/
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#if CONFIG_NFILE_DESCRIPTORS > 0 && defined(CONFIG_NET) && CONFIG_NSOCKET_DESCRIPTORS > 0
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Global Functions
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****************************************************************************/
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/****************************************************************************
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* Name: dup2
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*
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* Description:
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* Clone a file descriptor or socket descriptor to a specific descriptor
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* number
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*
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****************************************************************************/
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int dup2(int fd1, int fd2)
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{
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/* Check the range of the descriptor to see if we got a file or a socket
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* descriptor.
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*/
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if ((unsigned int)fd1 >= CONFIG_NFILE_DESCRIPTORS)
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{
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/* Not a valid file descriptor. Did we get a valid socket descriptor? */
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if ((unsigned int)fd1 < (CONFIG_NFILE_DESCRIPTORS+CONFIG_NSOCKET_DESCRIPTORS))
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{
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/* Yes.. dup the socket descriptor */
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return net_dup2(fd1, fd2);
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}
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else
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{
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/* No.. then it is a bad descriptor number */
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set_errno(EBADF);
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return ERROR;
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}
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}
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else
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{
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/* Its a valid file descriptor.. dup the file descriptor */
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return file_dup2(fd1, fd2);
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}
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}
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#endif /* CONFIG_NFILE_DESCRIPTORS > 0 ... */
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