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107 lines
3.7 KiB
107 lines
3.7 KiB
/**************************************************************************** |
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* fs/fs_dup.c |
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* |
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* Copyright (C) 2007-2009 Gregory Nutt. All rights reserved. |
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr> |
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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 <nuttx/fs/fs.h> |
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#include "fs_internal.h" |
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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: dup |
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* |
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* Description: |
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* Clone a file or socket descriptor to an arbitray descriptor number |
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* |
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****************************************************************************/ |
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int dup(int fildes) |
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{ |
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int ret = OK; |
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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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#if CONFIG_NFILE_DESCRIPTORS > 0 |
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if ((unsigned int)fildes < CONFIG_NFILE_DESCRIPTORS) |
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{ |
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/* Its a valid file descriptor.. dup the file descriptor using any |
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* other file descriptor*/ |
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ret = file_dup(fildes, 0); |
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} |
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else |
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#endif |
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{ |
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/* Not a vailid file descriptor. Did we get a valid socket descriptor? */ |
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#if defined(CONFIG_NET) && CONFIG_NSOCKET_DESCRIPTORS > 0 |
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if ((unsigned int)fildes < (CONFIG_NFILE_DESCRIPTORS+CONFIG_NSOCKET_DESCRIPTORS)) |
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{ |
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/* Yes.. dup the socket descriptor */ |
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ret = net_dup(fildes, CONFIG_NFILE_DESCRIPTORS); |
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} |
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else |
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#endif |
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{ |
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/* No.. then it is a bad descriptor number */ |
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errno = EBADF; |
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ret = ERROR; |
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} |
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} |
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return ret; |
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} |
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