[85d03e2] | 1 | /* /dev/null |
---|
| 2 | * |
---|
| 3 | * Derived from rtems' stub driver. |
---|
| 4 | * |
---|
| 5 | * Author: Ralf Corsepius (corsepiu@faw.uni-ulm.de) |
---|
| 6 | * |
---|
| 7 | * COPYRIGHT (c) 1989-2000. |
---|
| 8 | * On-Line Applications Research Corporation (OAR). |
---|
| 9 | * |
---|
| 10 | * The license and distribution terms for this file may be |
---|
| 11 | * found in the file LICENSE in this distribution or at |
---|
| 12 | * http://www.OARcorp.com/rtems/license.html. |
---|
| 13 | * |
---|
| 14 | * $Id$ |
---|
| 15 | */ |
---|
| 16 | |
---|
| 17 | #include <rtems.h> |
---|
| 18 | #include <rtems/devnull.h> |
---|
| 19 | #include <rtems/libio.h> |
---|
| 20 | |
---|
| 21 | /* null_initialize |
---|
| 22 | * |
---|
| 23 | * This routine is the null device driver init routine. |
---|
| 24 | * |
---|
| 25 | * Input parameters: |
---|
| 26 | * major - device major number |
---|
| 27 | * minor - device minor number |
---|
| 28 | * pargp - pointer to parameter block |
---|
| 29 | * |
---|
| 30 | * Output parameters: |
---|
| 31 | * rval - NULL_SUCCESSFUL |
---|
| 32 | */ |
---|
| 33 | |
---|
| 34 | rtems_unsigned32 NULL_major; |
---|
[d3b8713a] | 35 | static char initialized; |
---|
[85d03e2] | 36 | |
---|
| 37 | rtems_device_driver null_initialize( |
---|
| 38 | rtems_device_major_number major, |
---|
| 39 | rtems_device_minor_number minor, |
---|
| 40 | void *pargp |
---|
| 41 | ) |
---|
| 42 | { |
---|
[a5bdcd98] | 43 | rtems_device_driver status; |
---|
[85d03e2] | 44 | |
---|
[a5bdcd98] | 45 | if ( !initialized ) { |
---|
| 46 | initialized = 1; |
---|
| 47 | |
---|
| 48 | status = rtems_io_register_name( |
---|
| 49 | "/dev/null", |
---|
| 50 | major, |
---|
| 51 | (rtems_device_minor_number) 0 |
---|
[85d03e2] | 52 | ); |
---|
| 53 | |
---|
[a5bdcd98] | 54 | if (status != RTEMS_SUCCESSFUL) |
---|
| 55 | rtems_fatal_error_occurred(status); |
---|
[85d03e2] | 56 | |
---|
[a5bdcd98] | 57 | NULL_major = major; |
---|
| 58 | } |
---|
[85d03e2] | 59 | |
---|
| 60 | return RTEMS_SUCCESSFUL; |
---|
| 61 | } |
---|
| 62 | |
---|
| 63 | /* null_open |
---|
| 64 | * |
---|
| 65 | * This routine is the null device driver open routine. |
---|
| 66 | * |
---|
| 67 | * Input parameters: |
---|
| 68 | * major - device major number |
---|
| 69 | * minor - device minor number |
---|
| 70 | * pargb - pointer to open parameter block |
---|
| 71 | * |
---|
| 72 | * Output parameters: |
---|
| 73 | * rval - NULL_SUCCESSFUL |
---|
| 74 | */ |
---|
| 75 | |
---|
| 76 | rtems_device_driver null_open( |
---|
| 77 | rtems_device_major_number major, |
---|
| 78 | rtems_device_minor_number minor, |
---|
| 79 | void *pargp |
---|
| 80 | ) |
---|
| 81 | { |
---|
| 82 | return NULL_SUCCESSFUL; |
---|
| 83 | } |
---|
| 84 | |
---|
| 85 | |
---|
| 86 | /* null_close |
---|
| 87 | * |
---|
| 88 | * This routine is the null device driver close routine. |
---|
| 89 | * |
---|
| 90 | * Input parameters: |
---|
| 91 | * major - device major number |
---|
| 92 | * minor - device minor number |
---|
| 93 | * pargb - pointer to close parameter block |
---|
| 94 | * |
---|
| 95 | * Output parameters: |
---|
| 96 | * rval - NULL_SUCCESSFUL |
---|
| 97 | */ |
---|
| 98 | |
---|
| 99 | rtems_device_driver null_close( |
---|
| 100 | rtems_device_major_number major, |
---|
| 101 | rtems_device_minor_number minor, |
---|
| 102 | void *pargp |
---|
| 103 | ) |
---|
| 104 | { |
---|
| 105 | return NULL_SUCCESSFUL; |
---|
| 106 | } |
---|
| 107 | |
---|
| 108 | |
---|
| 109 | /* null_read |
---|
| 110 | * |
---|
| 111 | * This routine is the null device driver read routine. |
---|
| 112 | * |
---|
| 113 | * Input parameters: |
---|
| 114 | * major - device major number |
---|
| 115 | * minor - device minor number |
---|
| 116 | * pargp - pointer to read parameter block |
---|
| 117 | * |
---|
| 118 | * Output parameters: |
---|
| 119 | * rval - NULL_SUCCESSFUL |
---|
| 120 | */ |
---|
| 121 | |
---|
| 122 | rtems_device_driver null_read( |
---|
| 123 | rtems_device_major_number major, |
---|
| 124 | rtems_device_minor_number minor, |
---|
| 125 | void *pargp |
---|
| 126 | ) |
---|
| 127 | { |
---|
| 128 | return NULL_SUCCESSFUL; |
---|
| 129 | } |
---|
| 130 | |
---|
| 131 | |
---|
| 132 | /* null_write |
---|
| 133 | * |
---|
| 134 | * This routine is the null device driver write routine. |
---|
| 135 | * |
---|
| 136 | * Input parameters: |
---|
| 137 | * major - device major number |
---|
| 138 | * minor - device minor number |
---|
| 139 | * pargp - pointer to write parameter block |
---|
| 140 | * |
---|
| 141 | * Output parameters: |
---|
| 142 | * rval - NULL_SUCCESSFUL |
---|
| 143 | */ |
---|
| 144 | |
---|
| 145 | rtems_device_driver null_write( |
---|
| 146 | rtems_device_major_number major, |
---|
| 147 | rtems_device_minor_number minor, |
---|
| 148 | void *pargp |
---|
| 149 | ) |
---|
| 150 | { |
---|
[a5bdcd98] | 151 | rtems_libio_rw_args_t *rw_args = (rtems_libio_rw_args_t *) pargp; |
---|
[85d03e2] | 152 | |
---|
[a5bdcd98] | 153 | if ( rw_args ) |
---|
| 154 | rw_args->bytes_moved = rw_args->count; |
---|
[85d03e2] | 155 | |
---|
| 156 | return NULL_SUCCESSFUL; |
---|
| 157 | } |
---|
| 158 | |
---|
| 159 | |
---|
| 160 | /* null_control |
---|
| 161 | * |
---|
| 162 | * This routine is the null device driver control routine. |
---|
| 163 | * |
---|
| 164 | * Input parameters: |
---|
| 165 | * major - device major number |
---|
| 166 | * minor - device minor number |
---|
| 167 | * pargp - pointer to cntrl parameter block |
---|
| 168 | * |
---|
| 169 | * Output parameters: |
---|
| 170 | * rval - NULL_SUCCESSFUL |
---|
| 171 | */ |
---|
| 172 | |
---|
| 173 | rtems_device_driver null_control( |
---|
| 174 | rtems_device_major_number major, |
---|
| 175 | rtems_device_minor_number minor, |
---|
| 176 | void *pargp |
---|
| 177 | ) |
---|
| 178 | { |
---|
| 179 | return NULL_SUCCESSFUL; |
---|
| 180 | } |
---|