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[/] [or1k/] [trunk/] [rtems-20020807/] [c/] [src/] [libmisc/] [devnull/] [devnull.c] - Blame information for rev 1765

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/*  /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.
 *
 *  devnull.c,v 1.3 2001/09/13 21:04:49 joel Exp
 */
 
#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;
static char initialized;
 
rtems_device_driver null_initialize(
  rtems_device_major_number major,
  rtems_device_minor_number minor,
  void *pargp
)
{
  rtems_device_driver status;
 
  if ( !initialized ) {
    initialized = 1;
 
    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;
 
  if ( rw_args )
    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;
}

Line No.	Rev	Author	Line
1	1026	ivang	`/* /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			`* devnull.c,v 1.3 2001/09/13 21:04:49 joel Exp`
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;`
35			`static char initialized;`
36
37			`rtems_device_driver null_initialize(`
38			`rtems_device_major_number major,`
39			`rtems_device_minor_number minor,`
40			`void *pargp`
41			`)`
42			`{`
43			`rtems_device_driver status;`
44
45			`if ( !initialized ) {`
46			`initialized = 1;`
47
48			`status = rtems_io_register_name(`
49			`"/dev/null",`
50			`major,`
51			`(rtems_device_minor_number) 0`
52			`);`
53
54			`if (status != RTEMS_SUCCESSFUL)`
55			`rtems_fatal_error_occurred(status);`
56
57			`NULL_major = major;`
58			`}`
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			`{`
151			`rtems_libio_rw_args_t rw_args = (rtems_libio_rw_args_t ) pargp;`
152
153			`if ( rw_args )`
154			`rw_args->bytes_moved = rw_args->count;`
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			`}`

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[/] [or1k/] [trunk/] [rtems-20020807/] [c/] [src/] [libmisc/] [devnull/] [devnull.c] - Blame information for rev 1765