Subversion Repositories openrisc_2011-10-31

/*

 *  IMFS Device Node Handlers

 *

 *  This file contains the set of handlers used to map operations on

 *  IMFS device nodes onto calls to the RTEMS Classic API IO Manager.

 *

 *  COPYRIGHT (c) 1989-1999.

 *  On-Line Applications Research Corporation (OAR).

 *

 *  The license and distribution terms for this file may be

 *  found in the file LICENSE in this distribution or at

 *  http://www.OARcorp.com/rtems/license.html.

 *

 *  $Id: deviceio.c,v 1.2 2001-09-27 12:01:15 chris Exp $

 */

#include <rtems.h>

#include <rtems/libio.h>

#include "libio_.h"

#include "imfs.h"

/*

 *  device_open

 *

 *  This handler maps an open() operation onto rtems_io_open().

 */

int device_open(

  rtems_libio_t *iop,

  const char    *pathname,

  unsigned32     flag,

  unsigned32     mode

)

{

  rtems_libio_open_close_args_t  args;

  rtems_status_code              status;

  IMFS_jnode_t                  *the_jnode;

  the_jnode  = iop->file_info;

  args.iop   = iop;

  args.flags = iop->flags;

  args.mode  = mode;

  status = rtems_io_open(

    the_jnode->info.device.major,

    the_jnode->info.device.minor,

    (void *) &args

  );

  if ( status )

    return RTEMS_UNSATISFIED;

  return 0;

}

/*

 *  device_close

 *

 *  This handler maps a close() operation onto rtems_io_close().

 */

int device_close(

  rtems_libio_t *iop

)

{

  rtems_libio_open_close_args_t  args;

  rtems_status_code              status;

  IMFS_jnode_t                  *the_jnode;

  the_jnode = iop->file_info;

  args.iop   = iop;

  args.flags = 0;

  args.mode  = 0;

  status = rtems_io_close(

    the_jnode->info.device.major,

    the_jnode->info.device.minor,

    (void *) &args

  );

  if ( status )

    return RTEMS_UNSATISFIED;

  return 0;

}

/*

 *  device_read

 *

 *  This handler maps a read() operation onto rtems_io_read().

 */

int device_read(

  rtems_libio_t *iop,

  void          *buffer,

  unsigned32     count

)

{

  rtems_libio_rw_args_t   args;

  rtems_status_code       status;

  IMFS_jnode_t           *the_jnode;

  the_jnode = iop->file_info;

  args.iop         = iop;

  args.offset      = iop->offset;

  args.buffer      = buffer;

  args.count       = count;

  args.flags       = iop->flags;

  args.bytes_moved = 0;

  status = rtems_io_read(

    the_jnode->info.device.major,

    the_jnode->info.device.minor,

    (void *) &args

  );

  if ( status )

    return -1;

  return args.bytes_moved;

}

/*

 *  device_write

 *

 *  This handler maps a write() operation onto rtems_io_write().

 */

int device_write(

  rtems_libio_t *iop,

  const void    *buffer,

  unsigned32     count

)

{

  rtems_libio_rw_args_t   args;

  rtems_status_code       status;

  IMFS_jnode_t           *the_jnode;

  the_jnode = iop->file_info;

  args.iop         = iop;

  args.offset      = iop->offset;

  args.buffer      = (void *) buffer;

  args.count       = count;

  args.flags       = iop->flags;

  args.bytes_moved = 0;

  status = rtems_io_write(

    the_jnode->info.device.major,

    the_jnode->info.device.minor,

    (void *) &args

  );

  if ( status )

    return -1;

  return args.bytes_moved;

}

/*

 *  device_ioctl

 *

 *  This handler maps an ioctl() operation onto rtems_io_ioctl().

 */

int device_ioctl(

  rtems_libio_t *iop,

  unsigned32     command,

  void          *buffer

)

{

  rtems_libio_ioctl_args_t  args;

  rtems_status_code         status;

  IMFS_jnode_t             *the_jnode;

  args.iop     = iop;

  args.command = command;

  args.buffer  = buffer;

  the_jnode = iop->file_info;

  status = rtems_io_control(

    the_jnode->info.device.major,

    the_jnode->info.device.minor,

    (void *) &args

  );

  if ( status )

    return -1;

  return args.ioctl_return;

}

/*

 *  device_lseek

 *

 *  This handler eats all lseek() operations.

 */

int device_lseek(

  rtems_libio_t *iop,

  off_t          offset,

  int            whence

)

{

  return 0;

}

/*

 *  device_stat

 *

 *  The IMFS_stat() is used.

 */

/*

 *  device_rmnod

 *

 *  The IMFS_rmnod() is used.

 */