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