127 lines
3.9 KiB
C
127 lines
3.9 KiB
C
/****************************************************************************
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* fs/vfs/fs_dup.c
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*
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* Copyright (C) 2007-2009, 2017 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 <nuttx/fs/fs.h>
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#include "inode/inode.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nx_dup
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*
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* Description:
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* nx_dup() is similar to the standard 'dup' interface except that is
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* not a cancellation point and it does not modify the errno variable.
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*
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* nx_dup() is an internal NuttX interface and should not be called from
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* applications.
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*
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* Returned Value:
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* The new file descriptor is returned on success; a negated errno value is
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* returned on any failure.
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*
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****************************************************************************/
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int nx_dup(int fd)
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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 (fd < 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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*/
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return fs_dupfd(fd, 0);
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}
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else
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{
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/* Not a valid file descriptor.
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* Did we get a valid socket descriptor?
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*/
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#ifdef CONFIG_NET
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if (fd < (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_dup(fd, 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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return -EBADF;
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}
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}
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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 arbitrary descriptor number
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*
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****************************************************************************/
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int dup(int fd)
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{
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int ret;
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ret = nx_dup(fd);
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if (ret < 0)
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{
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set_errno(-ret);
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ret = ERROR;
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}
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return ret;
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}
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