summaryrefslogtreecommitdiffstats
path: root/cpukit/libfs/src/imfs/deviceio.c
blob: f7631916fdb6ea71bd1696623b2abfc44cdb3eb0 (plain) (blame)
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
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
/*
 *  IMFS Device Node Handlers
 *
 *  This file contains the set of handlers used to map operations on
 *  IMFS device nodes onto calls to the RTEMS Classic API IO 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.
 *
 *  $Id$
 */

#if HAVE_CONFIG_H
#include "config.h"
#endif

#include <rtems.h>
#include <rtems/libio.h>
#include <rtems/assoc.h>                /* assoc.h not included by rtems.h */
#include <errno.h>

#include "imfs.h"

/*
 * Convert RTEMS status to a UNIX errno
 */

rtems_assoc_t errno_assoc[] = {
    { "OK",                 RTEMS_SUCCESSFUL,                0 },
    { "BUSY",               RTEMS_RESOURCE_IN_USE,           EBUSY },
    { "INVALID NAME",       RTEMS_INVALID_NAME,              EINVAL },
    { "NOT IMPLEMENTED",    RTEMS_NOT_IMPLEMENTED,           ENOSYS },
    { "TIMEOUT",            RTEMS_TIMEOUT,                   ETIMEDOUT },
    { "NO MEMORY",          RTEMS_NO_MEMORY,                 ENOMEM },
    { "NO DEVICE",          RTEMS_UNSATISFIED,               ENODEV },
    { "INVALID NUMBER",     RTEMS_INVALID_NUMBER,            EBADF},
    { "NOT RESOURCE OWNER", RTEMS_NOT_OWNER_OF_RESOURCE,     EPERM},
    { "IO ERROR",           RTEMS_IO_ERROR,                  EIO},
    { 0, 0, 0 },
};

static int
rtems_deviceio_errno(rtems_status_code code)
{
    int rc;
    
    if ((rc = rtems_assoc_remote_by_local(errno_assoc, (unsigned32) code)))
    {
        errno = rc;
        return -1;
    }
    return -1;
}

/*
 *  device_open
 *
 *  This handler maps an open() operation onto rtems_io_open().
 */

int device_open(
  rtems_libio_t *iop,
  const char    *pathname,
  unsigned32     flag,
  unsigned32     mode
)
{
  rtems_libio_open_close_args_t  args;
  rtems_status_code              status;
  IMFS_jnode_t                  *the_jnode;

  the_jnode  = iop->file_info;

  args.iop   = iop;
  args.flags = iop->flags;
  args.mode  = mode;

  status = rtems_io_open(
    the_jnode->info.device.major,
    the_jnode->info.device.minor,
    (void *) &args
  );
  if ( status )
    return rtems_deviceio_errno(status);

  return 0;
}

/*
 *  device_close
 *
 *  This handler maps a close() operation onto rtems_io_close().
 */

int device_close(
  rtems_libio_t *iop
)
{
  rtems_libio_open_close_args_t  args;
  rtems_status_code              status;
  IMFS_jnode_t                  *the_jnode;

  the_jnode = iop->file_info;

  args.iop   = iop;
  args.flags = 0;
  args.mode  = 0;

  status = rtems_io_close(
    the_jnode->info.device.major,
    the_jnode->info.device.minor,
    (void *) &args
  );
  if ( status ) {
    return rtems_deviceio_errno(status);
  }
  return 0;
}

/*
 *  device_read
 *
 *  This handler maps a read() operation onto rtems_io_read().
 */

ssize_t device_read(
  rtems_libio_t *iop,
  void          *buffer,
  unsigned32     count
)
{
  rtems_libio_rw_args_t   args;
  rtems_status_code       status;
  IMFS_jnode_t           *the_jnode;

  the_jnode = iop->file_info;

  args.iop         = iop;
  args.offset      = iop->offset;
  args.buffer      = buffer;
  args.count       = count;
  args.flags       = iop->flags;
  args.bytes_moved = 0;

  status = rtems_io_read(
    the_jnode->info.device.major,
    the_jnode->info.device.minor,
    (void *) &args
  );

  if ( status )
    return rtems_deviceio_errno(status);

  return (ssize_t) args.bytes_moved;
}

/*
 *  device_write
 *
 *  This handler maps a write() operation onto rtems_io_write().
 */

ssize_t device_write(
  rtems_libio_t *iop,
  const void    *buffer,
  unsigned32     count
)
{
  rtems_libio_rw_args_t   args;
  rtems_status_code       status;
  IMFS_jnode_t           *the_jnode;

  the_jnode = iop->file_info;

  args.iop         = iop;
  args.offset      = iop->offset;
  args.buffer      = (void *) buffer;
  args.count       = count;
  args.flags       = iop->flags;
  args.bytes_moved = 0;

  status = rtems_io_write(
    the_jnode->info.device.major,
    the_jnode->info.device.minor,
    (void *) &args
  );

  if ( status )
    return rtems_deviceio_errno(status);

  return (ssize_t) args.bytes_moved;
}

/*
 *  device_ioctl
 *
 *  This handler maps an ioctl() operation onto rtems_io_ioctl().
 */

int device_ioctl(
  rtems_libio_t *iop,
  unsigned32     command,
  void          *buffer
)
{
  rtems_libio_ioctl_args_t  args;
  rtems_status_code         status;
  IMFS_jnode_t             *the_jnode;

  args.iop     = iop;
  args.command = command;
  args.buffer  = buffer;

  the_jnode = iop->file_info;

  status = rtems_io_control(
    the_jnode->info.device.major,
    the_jnode->info.device.minor,
    (void *) &args
  );

  if ( status )
    return rtems_deviceio_errno(status);

  return args.ioctl_return;
}

/*
 *  device_lseek
 *
 *  This handler eats all lseek() operations.
 */

int device_lseek(
  rtems_libio_t *iop,
  off_t          offset,
  int            whence
)
{
  return 0;
}

/*
 *  device_stat
 *
 *  The IMFS_stat() is used.
 */

/*
 *  device_rmnod
 *
 *  The IMFS_rmnod() is used.
 */