123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107 |
- /****************************************************************************
- * fs/vfs/fs_getfilep.c
- *
- * Copyright (C) 2014, 2016-2017 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 <sys/types.h>
- #include <sys/socket.h>
- #include <unistd.h>
- #include <fcntl.h>
- #include <sched.h>
- #include <errno.h>
- #include "inode/inode.h"
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: fs_getfilep
- *
- * Description:
- * Given a file descriptor, return the corresponding instance of struct
- * file. NOTE that this function will currently fail if it is provided
- * with a socket descriptor.
- *
- * Input Parameters:
- * fd - The file descriptor
- * filep - The location to return the struct file instance
- *
- * Returned Value:
- * Zero (OK) is returned on success; a negated errno value is returned on
- * any failure.
- *
- ****************************************************************************/
- int fs_getfilep(int fd, FAR struct file **filep)
- {
- FAR struct filelist *list;
- DEBUGASSERT(filep != NULL);
- *filep = (FAR struct file *)NULL;
- if ((unsigned int)fd >= CONFIG_NFILE_DESCRIPTORS)
- {
- return -EBADF;
- }
- /* The descriptor is in a valid range to file descriptor... Get the
- * thread-specific file list.
- */
- list = nxsched_get_files();
- /* The file list can be NULL under two cases: (1) One is an obscure
- * cornercase: When memory management debug output is enabled. Then
- * there may be attempts to write to stdout from malloc before the group
- * data has been allocated. The other other is (2) if this is a kernel
- * thread. Kernel threads have no allocated file descriptors.
- */
- if (list == NULL)
- {
- return -EAGAIN;
- }
- /* And return the file pointer from the list */
- *filep = &list->fl_files[fd];
- return OK;
- }
|