149 lines
4.6 KiB
C
149 lines
4.6 KiB
C
/****************************************************************************
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* fs/vfs/fs_fstat.c
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*
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* Copyright (C) 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: fstat
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*
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* Description:
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* The fstat() function will obtain information about an open file
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* associated with the file descriptor 'fd', and will write it to the area
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* pointed to by 'buf'.
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*
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* The 'buf' argument is a pointer to a stat structure, as defined in
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* <sys/stat.h>, into which information is placed concerning the file.
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*
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* Input Parameters:
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* fd - The file descriptor associated with the open file of interest
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* buf - The caller provide location in which to return information about
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* the open file.
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*
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* Returned Value:
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* Upon successful completion, 0 shall be returned. Otherwise, -1 shall be
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* returned and errno set to indicate the error.
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*
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****************************************************************************/
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int fstat(int fd, FAR struct stat *buf)
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{
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FAR struct file *filep;
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FAR struct inode *inode;
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int ret;
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/* Did we get a valid file descriptor? */
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if ((unsigned int)fd >= CONFIG_NFILE_DESCRIPTORS)
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{
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/* No networking... it is a bad descriptor in any event */
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ret = -EBADF;
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goto errout;
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}
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/* The descriptor is in a valid range to file descriptor... do the
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* read. First, get the file structure. Note that on failure,
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* fs_getfilep() will set the errno variable.
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*/
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ret = fs_getfilep(fd, &filep);
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if (ret < 0)
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{
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goto errout;
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}
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DEBUGASSERT(filep != NULL);
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/* Get the inode from the file structure */
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inode = filep->f_inode;
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DEBUGASSERT(inode != NULL);
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/* The way we handle the stat depends on the type of inode that we
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* are dealing with.
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*/
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#ifndef CONFIG_DISABLE_MOUNTPOINT
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if (INODE_IS_MOUNTPT(inode))
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{
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/* The inode is a file system mointpoint. Verify that the mountpoint
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* supports the fstat() method
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*/
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ret = -ENOSYS;
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if (inode->u.i_mops && inode->u.i_mops->fstat)
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{
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/* Perform the fstat() operation */
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ret = inode->u.i_mops->fstat(filep, buf);
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}
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}
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else
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#endif
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{
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/* The inode is part of the root pseudo file system. */
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ret = inode_stat(inode, buf);
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}
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/* Check if the fstat operation was successful */
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if (ret >= 0)
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{
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/* Successfully fstat'ed the file */
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return OK;
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}
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errout:
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set_errno(-ret);
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return ERROR;
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}
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