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
|
/*
* udevdb.c
*
* Userspace devfs
*
* Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
* Copyright (C) 2003 IBM Corp.
*
* This program 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 version 2 of the License.
*
* This program 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.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
/*
* udev database library
*/
#define _KLIBC_HAS_ARCH_SIG_ATOMIC_T
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <string.h>
#include <sys/stat.h>
#include <errno.h>
#include <signal.h>
#include "libsysfs/sysfs/libsysfs.h"
#include "udev_version.h"
#include "udev.h"
#include "logging.h"
#include "namedev.h"
#include "udevdb.h"
#include "tdb/tdb.h"
static TDB_CONTEXT *udevdb;
int udevdb_add_dev(const char *path, const struct udevice *dev)
{
TDB_DATA key, data;
char keystr[SYSFS_PATH_MAX];
if ((path == NULL) || (dev == NULL))
return -ENODEV;
memset(keystr, 0, NAME_SIZE);
strfieldcpy(keystr, path);
key.dptr = keystr;
key.dsize = strlen(keystr) + 1;
data.dptr = (void *)dev;
data.dsize = UDEVICE_LEN;
return tdb_store(udevdb, key, data, TDB_REPLACE);
}
int udevdb_get_dev(const char *path, struct udevice *dev)
{
TDB_DATA key, data;
if (path == NULL)
return -ENODEV;
key.dptr = (void *)path;
key.dsize = strlen(path) + 1;
data = tdb_fetch(udevdb, key);
if (data.dptr == NULL || data.dsize == 0)
return -ENODEV;
memset(dev, 0, sizeof(struct udevice));
memcpy(dev, data.dptr, UDEVICE_LEN);
return 0;
}
int udevdb_delete_dev(const char *path)
{
TDB_DATA key;
char keystr[SYSFS_PATH_MAX];
if (path == NULL)
return -EINVAL;
memset(keystr, 0, sizeof(keystr));
strfieldcpy(keystr, path);
key.dptr = keystr;
key.dsize = strlen(keystr) + 1;
return tdb_delete(udevdb, key);
}
/**
* udevdb_exit: closes database
*/
void udevdb_exit(void)
{
if (udevdb != NULL) {
tdb_close(udevdb);
udevdb = NULL;
}
}
/**
* udevdb_init: initializes database
* @init_flag: UDEVDB_INTERNAL - database stays in memory
* UDEVDB_DEFAULT - database is written to a file
*/
int udevdb_init(int init_flag)
{
if (init_flag != UDEVDB_DEFAULT && init_flag != UDEVDB_INTERNAL)
return -EINVAL;
udevdb = tdb_open(udev_db_filename, 0, init_flag, O_RDWR | O_CREAT, 0644);
if (udevdb == NULL) {
if (init_flag == UDEVDB_INTERNAL)
dbg("unable to initialize in-memory database");
else
dbg("unable to initialize database at '%s'", udev_db_filename);
return -EACCES;
}
return 0;
}
/**
* udevdb_open_ro: open database for reading
*/
int udevdb_open_ro(void)
{
udevdb = tdb_open(udev_db_filename, 0, 0, O_RDONLY, 0);
if (udevdb == NULL) {
dbg("unable to open database at '%s'", udev_db_filename);
return -EACCES;
}
return 0;
}
static int (*user_record_callback) (char *path, struct udevice *dev);
static int traverse_callback(TDB_CONTEXT *tdb, TDB_DATA key, TDB_DATA dbuf, void *state)
{
return user_record_callback((char*) key.dptr, (struct udevice*) dbuf.dptr);
}
/**
* udevdb_call_foreach: dumps whole database by passing record data to user function
* @user_record_handler: user function called for every record in the database
*/
int udevdb_call_foreach(int (*user_record_handler) (char *path, struct udevice *dev))
{
int retval = 0;
if (user_record_handler == NULL) {
dbg("invalid user record handling function");
return -EINVAL;
}
user_record_callback = user_record_handler;
retval = tdb_traverse(udevdb, traverse_callback, NULL);
if (retval < 0)
return -ENODEV;
else
return 0;
}
static struct udevice *find_dev;
static char *find_path;
static const char *find_name;
static int find_found;
static int find_device_by_name(char *path, struct udevice *dev)
{
int pos, len;
if (strncmp(dev->name, find_name, sizeof(dev->name)) == 0) {
memcpy(find_dev, dev, sizeof(struct udevice));
strnfieldcpy(find_path, path, NAME_SIZE);
find_found = 1;
/* stop search */
return 1;
}
/* look for matching symlink*/
foreach_strpart(dev->symlink, " ", pos, len) {
if (strncmp(&dev->symlink[pos], find_name, len) != 0)
continue;
if (len != strlen(find_name))
continue;
memcpy(find_dev, dev, sizeof(struct udevice));
strnfieldcpy(find_path, path, NAME_SIZE);
find_found = 1;
return 1;
}
return 0;
}
/**
* udevdb_get_dev_byname: search device with given name by traversing the whole database
*/
int udevdb_get_dev_byname(const char *name, char *path, struct udevice *dev)
{
find_found = 0;
find_path = path;
find_dev = dev;
find_name = name;
udevdb_call_foreach(find_device_by_name);
if (find_found == 1)
return 0;
else
return -1;
}
|
