114 lines
3.6 KiB
C
114 lines
3.6 KiB
C
/****************************************************************************
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* fs/vfs/fs_dupfd2.c
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*
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* Copyright (C) 2007-2009, 2011-2014, 2017 Gregory Nutt. All rights
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* 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 "inode/inode.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define DUP_ISOPEN(filep) (filep->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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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: fs_dupfd2
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*
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* Description:
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* Clone a file descriptor to a specific descriptor number.
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*
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* Returned Value:
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* Zero (OK) is returned on success; a negated errno value is return on
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* any failure.
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*
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****************************************************************************/
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int fs_dupfd2(int fd1, int fd2)
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{
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FAR struct file *filep1;
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FAR struct file *filep2 = NULL;
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int ret;
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/* Get the file structures corresponding to the file descriptors. */
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ret = fs_getfilep(fd1, &filep1);
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if (ret >= 0)
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{
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ret = fs_getfilep(fd2, &filep2);
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}
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if (ret < 0)
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{
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return ret;
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}
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DEBUGASSERT(filep1 != NULL && filep2 != NULL);
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/* Verify that fd1 is a valid, open file descriptor */
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if (!DUP_ISOPEN(filep1))
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{
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return -EBADF;
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}
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/* Handle a special case */
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if (fd1 == fd2)
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{
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return fd1;
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}
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/* Perform the dup2 operation */
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return file_dup2(filep1, filep2);
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}
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