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- /****************************************************************************
- * fs/vfs/fs_dupfd2.c
- *
- * Copyright (C) 2007-2009, 2011-2014, 2017 Gregory Nutt. All rights
- * reserved.
- * Author: Gregory Nutt <gnutt@nuttx.org>
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- * 3. Neither the name NuttX nor the names of its contributors may be
- * used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
- * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- ****************************************************************************/
- /****************************************************************************
- * Included Files
- ****************************************************************************/
- #include <nuttx/config.h>
- #include <unistd.h>
- #include <sched.h>
- #include <errno.h>
- #include "inode/inode.h"
- /****************************************************************************
- * Pre-processor Definitions
- ****************************************************************************/
- #define DUP_ISOPEN(filep) (filep->f_inode != NULL)
- /****************************************************************************
- * Private Functions
- ****************************************************************************/
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: fs_dupfd2 OR dup2
- *
- * Description:
- * Clone a file descriptor to a specific descriptor number. If socket
- * descriptors are implemented, then this is called by dup2() for the
- * case of file descriptors. If socket descriptors are not implemented,
- * then this function IS dup2().
- *
- * Returned Value:
- * fs_dupfd is sometimes an OS internal function and sometimes is a direct
- * substitute for dup2(). So it must return an errno value as though it
- * were dup2().
- *
- ****************************************************************************/
- #ifdef CONFIG_NET
- int fs_dupfd2(int fd1, int fd2)
- #else
- int dup2(int fd1, int fd2)
- #endif
- {
- FAR struct file *filep1;
- FAR struct file *filep2 = NULL;
- int ret;
- /* Get the file structures corresponding to the file descriptors. */
- ret = fs_getfilep(fd1, &filep1);
- if (ret >= 0)
- {
- ret = fs_getfilep(fd2, &filep2);
- }
- if (ret < 0)
- {
- goto errout;
- }
- DEBUGASSERT(filep1 != NULL && filep2 != NULL);
- /* Verify that fd1 is a valid, open file descriptor */
- if (!DUP_ISOPEN(filep1))
- {
- ret = -EBADF;
- goto errout;
- }
- /* Handle a special case */
- if (fd1 == fd2)
- {
- return fd1;
- }
- /* Perform the dup2 operation */
- ret = file_dup2(filep1, filep2);
- if (ret < 0)
- {
- goto errout;
- }
- return OK;
- errout:
- set_errno(-ret);
- return ERROR;
- }
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