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
|
/* Store backend for unknown encodings
Copyright (C) 2001,02 Free Software Foundation, Inc.
This file is part of the GNU Hurd.
The GNU Hurd is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2, or (at
your option) any later version.
The GNU Hurd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA. */
#include "store.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
/* You can't do anything with an unknown store but encode it. */
static error_t
noread (struct store *store, store_offset_t addr, size_t index,
size_t amount, void **buf, size_t *len)
{
return EFTYPE;
}
static error_t
nowrite (struct store *store,
store_offset_t addr, size_t index,
const void *buf, size_t len, size_t *amount)
{
return EFTYPE;
}
static error_t
noset_size (struct store *store, size_t newsize)
{
return EFTYPE;
}
static error_t
noflags (struct store *store, int flags)
{
return EINVAL;
}
/* This is the only way that stores of the "unknown" class get created.
We save the store encoding verbatim and regurgitate it as our own. */
static struct store_enc *
duplicate_encoding (struct store_enc *enc)
{
struct store_enc *us;
size_t i;
us = calloc (1, sizeof *us);
if (us == NULL)
return NULL;
us->ports = mmap (0, enc->num_ports * sizeof *enc->ports,
PROT_READ|PROT_WRITE, MAP_ANON, 0, 0);
if (us->ports == MAP_FAILED)
{
no_memory:
store_enc_dealloc (us);
free (us);
return NULL;
}
us->ints = mmap (0, enc->num_ints * sizeof *enc->ints,
PROT_READ|PROT_WRITE, MAP_ANON, 0, 0);
if (us->ints == MAP_FAILED)
goto no_memory;
us->offsets = mmap (0, enc->num_offsets * sizeof *enc->offsets,
PROT_READ|PROT_WRITE, MAP_ANON, 0, 0);
if (us->offsets == MAP_FAILED)
goto no_memory;
us->data = mmap (0, enc->data_len, PROT_READ|PROT_WRITE, MAP_ANON, 0, 0);
if (us->data == MAP_FAILED)
goto no_memory;
memcpy (us->ports, enc->ports, enc->num_ports * sizeof *enc->ports);
memcpy (us->ints, enc->ints, enc->num_ints * sizeof *enc->ints);
memcpy (us->offsets, enc->offsets, enc->num_offsets * sizeof *enc->offsets);
memcpy (us->data, enc->data, enc->data_len);
us->num_ports = enc->num_ports;
us->num_ints = enc->num_ints;
us->num_offsets = enc->num_offsets;
us->data_len = enc->data_len;
for (i = 0; i < us->num_ports; ++i)
mach_port_mod_refs (mach_task_self (), us->ports[i],
MACH_PORT_RIGHT_SEND, +1);
return us;
}
error_t
store_unknown_decode (struct store_enc *enc,
const struct store_class *const *classes,
struct store **store)
{
struct store_enc *us;
error_t err = _store_create (&store_unknown_class,
MACH_PORT_NULL, STORE_ENFORCED, 0, NULL, 0, 0,
store);
if (err)
return err;
us = duplicate_encoding (enc);
if (us == NULL)
{
store_free (*store);
return ENOMEM;
}
(*store)->hook = us;
/* Derive a name for this unknown store from its encoded type field
(or lack thereof) and the leading string of its encoded data bytes. */
if (enc->cur_int == enc->num_ints)
asprintf (&(*store)->name, "notype:%.*s",
(int) (us->data_len - us->cur_data), us->data + us->cur_data);
else
asprintf (&(*store)->name, "type-%d:%.*s", enc->ints[enc->cur_int],
(int) ( us->data_len - us->cur_data), us->data + us->cur_data);
return 0;
}
/* Re-encode just the way we got it. */
error_t
unknown_allocate_encoding (const struct store *store, struct store_enc *enc)
{
const struct store_enc *us = store->hook;
if (us == NULL)
return EOPNOTSUPP;
enc->num_ports += us->num_ports;
enc->num_ints += us->num_ints;
enc->num_offsets += us->num_offsets;
enc->data_len += us->data_len;
return 0;
}
error_t
unknown_encode (const struct store *store, struct store_enc *enc)
{
const struct store_enc *us = store->hook;
if (us == NULL)
return EOPNOTSUPP;
memcpy (enc->ports, us->ports, us->num_ports * sizeof enc->ports[0]);
enc->ports += us->num_ports;
memcpy (enc->ints, us->ints, us->num_ints * sizeof enc->ints[0]);
enc->ints += us->num_ints;
memcpy (enc->offsets, us->offsets, us->num_offsets * sizeof enc->offsets[0]);
enc->offsets += us->num_offsets;
memcpy (enc->data + enc->cur_data, us->data, us->data_len);
enc->cur_data += us->data_len;
return 0;
}
/* Called just before deallocating STORE. */
static void
unknown_cleanup (struct store *store)
{
if (store->hook != NULL)
{
store_enc_dealloc (store->hook);
free (store->hook);
}
}
/* Copy any format-dependent fields in FROM to TO; if there's some reason
why the copy can't be made, an error should be returned. This call is
made after all format-independent fields have been cloned. */
static error_t
unknown_clone (const struct store *from, struct store *to)
{
if (from->hook == NULL)
return 0;
to->hook = duplicate_encoding (from->hook);
return to->hook ? 0 : ENOMEM;
}
/* Unknown stores cannot be opened with a name. */
static error_t
unknown_validate_name (const char *name,
const struct store_class *const *classes)
{
return name == NULL ? 0 : EINVAL;
}
static error_t
unknown_open (const char *name, int flags,
const struct store_class *const *classes,
struct store **store)
{
return (name == NULL
? _store_create (&store_unknown_class, MACH_PORT_NULL,
STORE_ENFORCED, 0, NULL, 0, 0, store)
: EINVAL);
}
const struct store_class store_unknown_class =
{
-1, "unknown",
read: noread,
write: nowrite,
set_size: noset_size,
allocate_encoding: unknown_allocate_encoding,
encode: unknown_encode,
decode: store_unknown_decode,
set_flags: noflags,
clear_flags: noflags,
cleanup: unknown_cleanup,
clone: unknown_clone,
open: unknown_open,
validate_name: unknown_validate_name,
};
STORE_STD_CLASS (unknown);
|
