px4-firmware/nuttx/fs/fs_ioctl.c

150 lines
4.4 KiB
C

/****************************************************************************
* fs/fs_ioctl.c
*
* Copyright (C) 2007-2010 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* 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/ioctl.h>
#include <sched.h>
#include <errno.h>
#include <net/if.h>
#if defined(CONFIG_NET) && CONFIG_NSOCKET_DESCRIPTORS > 0
# include <nuttx/net.h>
#endif
#include "fs_internal.h"
/****************************************************************************
* Global Functions
****************************************************************************/
/****************************************************************************
* Name: ioctl
*
* Description:
* Perform device specific operations.
*
* Parameters:
* fd File/socket descriptor of device
* req The ioctl command
* arg The argument of the ioctl cmd
*
* Return:
* >=0 on success (positive non-zero values are cmd-specific)
* -1 on failure withi errno set properly:
*
* EBADF
* 'fd' is not a valid descriptor.
* EFAULT
* 'arg' references an inaccessible memory area.
* EINVAL
* 'cmd' or 'arg' is not valid.
* ENOTTY
* 'fd' is not associated with a character special device.
* ENOTTY
* The specified request does not apply to the kind of object that the
* descriptor 'fd' references.
*
****************************************************************************/
int ioctl(int fd, int req, unsigned long arg)
{
int err;
#if CONFIG_NFILE_DESCRIPTORS > 0
FAR struct filelist *list;
FAR struct file *this_file;
FAR struct inode *inode;
int ret = OK;
/* Did we get a valid file descriptor? */
if ((unsigned int)fd >= CONFIG_NFILE_DESCRIPTORS)
#endif
{
/* Perform the socket ioctl */
#if defined(CONFIG_NET) && CONFIG_NSOCKET_DESCRIPTORS > 0
if ((unsigned int)fd < (CONFIG_NFILE_DESCRIPTORS+CONFIG_NSOCKET_DESCRIPTORS))
{
return netdev_ioctl(fd, req, arg);
}
else
#endif
{
err = EBADF;
goto errout;
}
}
#if CONFIG_NFILE_DESCRIPTORS > 0
/* Get the thread-specific file list */
list = sched_getfiles();
if (!list)
{
err = EMFILE;
goto errout;
}
/* Is a driver registered? Does it support the ioctl method? */
this_file = &list->fl_files[fd];
inode = this_file->f_inode;
if (inode && inode->u.i_ops && inode->u.i_ops->ioctl)
{
/* Yes, then let it perform the ioctl */
ret = (int)inode->u.i_ops->ioctl(this_file, req, arg);
if (ret < 0)
{
err = -ret;
goto errout;
}
}
return ret;
#endif
errout:
*get_errno_ptr() = err;
return ERROR;
}