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/*

 *  Interrupt 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.

 *

 *  intrcatch.c,v 1.2 1999/11/17 17:50:27 joel Exp

 */

#include <rtems/system.h>

#include <rtems/rtems/status.h>

#include <rtems/score/isr.h>

#include <rtems/rtems/intr.h>

/*  rtems_interrupt_catch

 *

 *  This directive allows a thread to specify what action to take when

 *  catching signals.

 *

 *  Input parameters:

 *    new_isr_handler - address of interrupt service routine (isr)

 *    vector          - interrupt vector number

 *    old_isr_handler - address at which to store previous ISR address

 *

 *  Output parameters:

 *    RTEMS_SUCCESSFUL - always succeeds

 *    *old_isr_handler  - previous ISR address

 */

rtems_status_code rtems_interrupt_catch(

  rtems_isr_entry      new_isr_handler,

  rtems_vector_number  vector,

  rtems_isr_entry     *old_isr_handler

)

{

  if ( !_ISR_Is_vector_number_valid( vector ) )

    return RTEMS_INVALID_NUMBER;

  if ( !_ISR_Is_valid_user_handler( (void *) new_isr_handler ) )

    return RTEMS_INVALID_ADDRESS;

  if ( !_ISR_Is_valid_user_handler( (void *) old_isr_handler ) )

    return RTEMS_INVALID_ADDRESS;

  _ISR_Install_vector(

    vector, (proc_ptr)new_isr_handler, (proc_ptr *)old_isr_handler );

  return RTEMS_SUCCESSFUL;

}