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121 lines
4.0 KiB
121 lines
4.0 KiB
/**************************************************************************** |
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* fs/fs_filedup2.c |
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* |
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* Copyright (C) 2007-2009, 2011-2012 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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#if CONFIG_NFILE_DESCRIPTORS > 0 |
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/**************************************************************************** |
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* Pre-processor Definitions |
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****************************************************************************/ |
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#define DUP_ISOPEN(fd, list) \ |
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((unsigned int)fd < CONFIG_NFILE_DESCRIPTORS && \ |
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list->fl_files[fd].f_inode != NULL) |
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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: file_dup2 OR dup2 |
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* |
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* Description: |
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* Clone a file descriptor to a specific descriptor number. If socket |
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* descriptors are implemented, then this is called by dup2() for the |
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* case of file descriptors. If socket descriptors are not implemented, |
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* then this function IS dup2(). |
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* |
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****************************************************************************/ |
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#if defined(CONFIG_NET) && CONFIG_NSOCKET_DESCRIPTORS > 0 |
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int file_dup2(int fildes1, int fildes2) |
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#else |
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int dup2(int fildes1, int fildes2) |
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#endif |
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{ |
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FAR struct filelist *list; |
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/* Get the thread-specific file list */ |
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list = sched_getfiles(); |
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if (!list) |
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{ |
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set_errno(EMFILE); |
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return ERROR; |
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} |
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/* Verify that fildes is a valid, open file descriptor */ |
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if (!DUP_ISOPEN(fildes1, list)) |
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{ |
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set_errno(EBADF); |
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return ERROR; |
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} |
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/* Handle a special case */ |
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if (fildes1 == fildes2) |
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{ |
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return fildes1; |
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} |
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/* Verify fildes2 */ |
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if ((unsigned int)fildes2 >= CONFIG_NFILE_DESCRIPTORS) |
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{ |
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set_errno(EBADF); |
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return ERROR; |
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} |
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return files_dup(&list->fl_files[fildes1], &list->fl_files[fildes2]); |
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} |
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#endif /* CONFIG_NFILE_DESCRIPTORS > 0 */ |
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