forked from Imagelibrary/rtems
3160ff6241
* cpuuse/cpuuse.c, cpuuse/cpuuse.h, devnull/devnull.c, devnull/devnull.h, dummy/dummy.c, dumpbuf/dumpbuf.c, dumpbuf/dumpbuf.h, fsmount/fsmount.c, fsmount/fsmount.h, serdbg/serdbgio.c, serdbg/termios_printk.c, stackchk/check.c, stackchk/internal.h, stackchk/stackchk.h, untar/untar.c, untar/untar.h: URL for license changed.
185 lines
3.5 KiB
C
185 lines
3.5 KiB
C
/* /dev/null
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*
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* Derived from rtems' stub driver.
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*
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* Author: Ralf Corsepius (corsepiu@faw.uni-ulm.de)
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*
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* COPYRIGHT (c) 1989-2000.
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* On-Line Applications Research Corporation (OAR).
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.com/license/LICENSE.
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*
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* $Id$
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <rtems.h>
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#include <rtems/devnull.h>
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#include <rtems/libio.h>
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/* null_initialize
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*
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* This routine is the null device driver init routine.
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*
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* Input parameters:
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* major - device major number
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* minor - device minor number
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* pargp - pointer to parameter block
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*
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* Output parameters:
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* rval - NULL_SUCCESSFUL
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*/
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rtems_unsigned32 NULL_major;
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static char initialized;
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rtems_device_driver null_initialize(
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rtems_device_major_number major,
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rtems_device_minor_number minor,
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void *pargp
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)
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{
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rtems_device_driver status;
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if ( !initialized ) {
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initialized = 1;
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status = rtems_io_register_name(
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"/dev/null",
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major,
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(rtems_device_minor_number) 0
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);
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if (status != RTEMS_SUCCESSFUL)
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rtems_fatal_error_occurred(status);
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NULL_major = major;
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}
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return RTEMS_SUCCESSFUL;
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}
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/* null_open
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*
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* This routine is the null device driver open routine.
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*
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* Input parameters:
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* major - device major number
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* minor - device minor number
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* pargb - pointer to open parameter block
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*
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* Output parameters:
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* rval - NULL_SUCCESSFUL
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*/
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rtems_device_driver null_open(
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rtems_device_major_number major,
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rtems_device_minor_number minor,
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void *pargp
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)
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{
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return NULL_SUCCESSFUL;
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}
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/* null_close
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*
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* This routine is the null device driver close routine.
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*
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* Input parameters:
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* major - device major number
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* minor - device minor number
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* pargb - pointer to close parameter block
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*
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* Output parameters:
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* rval - NULL_SUCCESSFUL
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*/
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rtems_device_driver null_close(
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rtems_device_major_number major,
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rtems_device_minor_number minor,
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void *pargp
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)
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{
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return NULL_SUCCESSFUL;
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}
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/* null_read
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*
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* This routine is the null device driver read routine.
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*
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* Input parameters:
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* major - device major number
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* minor - device minor number
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* pargp - pointer to read parameter block
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*
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* Output parameters:
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* rval - NULL_SUCCESSFUL
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*/
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rtems_device_driver null_read(
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rtems_device_major_number major,
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rtems_device_minor_number minor,
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void *pargp
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)
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{
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return NULL_SUCCESSFUL;
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}
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/* null_write
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*
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* This routine is the null device driver write routine.
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*
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* Input parameters:
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* major - device major number
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* minor - device minor number
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* pargp - pointer to write parameter block
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*
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* Output parameters:
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* rval - NULL_SUCCESSFUL
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*/
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rtems_device_driver null_write(
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rtems_device_major_number major,
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rtems_device_minor_number minor,
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void *pargp
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)
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{
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rtems_libio_rw_args_t *rw_args = (rtems_libio_rw_args_t *) pargp;
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if ( rw_args )
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rw_args->bytes_moved = rw_args->count;
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return NULL_SUCCESSFUL;
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}
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/* null_control
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*
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* This routine is the null device driver control routine.
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*
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* Input parameters:
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* major - device major number
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* minor - device minor number
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* pargp - pointer to cntrl parameter block
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*
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* Output parameters:
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* rval - NULL_SUCCESSFUL
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*/
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rtems_device_driver null_control(
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rtems_device_major_number major,
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rtems_device_minor_number minor,
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void *pargp
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)
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{
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return NULL_SUCCESSFUL;
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}
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