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/*
* Input/Output Manager - Dynamically Unregister Device Driver
*
* COPYRIGHT (c) 1989-2007.
* 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.rtems.com/license/LICENSE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/system.h>
#include <rtems/io.h>
#include <rtems/rtems/intr.h>
#include <rtems/score/thread.h>
#include <string.h>
/*
* rtems_io_unregister_driver
*
* Unregister a driver from the device driver table.
*
* Input Paramters:
* major - device major number
*
* Output Parameters:
* RTEMS_SUCCESSFUL - if successful
* error code - if unsuccessful
*/
rtems_status_code rtems_io_unregister_driver(
rtems_device_major_number major
)
{
if ( rtems_interrupt_is_in_progress() )
return RTEMS_CALLED_FROM_ISR;
if ( major < _IO_Number_of_drivers ) {
_Thread_Disable_dispatch();
memset(
&_IO_Driver_address_table[major],
0,
sizeof( rtems_driver_address_table )
);
_Thread_Enable_dispatch();
return RTEMS_SUCCESSFUL;
}
return RTEMS_UNSATISFIED;
}
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