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Commit | Line | Data |
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8dfc8dbe | 1 | /* |
c81b35c0 | 2 | * udevdb.c - udev database library |
8dfc8dbe GKH |
3 | * |
4 | * Userspace devfs | |
5 | * | |
6 | * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com> | |
7 | * Copyright (C) 2003 IBM Corp. | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify it | |
10 | * under the terms of the GNU General Public License as published by the | |
11 | * Free Software Foundation version 2 of the License. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, but | |
14 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License along | |
19 | * with this program; if not, write to the Free Software Foundation, Inc., | |
20 | * 675 Mass Ave, Cambridge, MA 02139, USA. | |
21 | * | |
22 | */ | |
23 | ||
d546791d | 24 | #define _KLIBC_HAS_ARCH_SIG_ATOMIC_T |
8e41d35d DS |
25 | #include <stdlib.h> |
26 | #include <stdio.h> | |
8ea84a8a | 27 | #include <string.h> |
c81b35c0 | 28 | #include <stddef.h> |
8e41d35d DS |
29 | #include <fcntl.h> |
30 | #include <string.h> | |
31 | #include <sys/stat.h> | |
32 | #include <errno.h> | |
a2822451 | 33 | #include <signal.h> |
8e41d35d | 34 | |
c80da508 | 35 | #include "libsysfs/sysfs/libsysfs.h" |
6739707d | 36 | #include "udev.h" |
c81b35c0 KS |
37 | #include "udev_lib.h" |
38 | #include "udev_version.h" | |
54988802 | 39 | #include "logging.h" |
6739707d | 40 | #include "namedev.h" |
8e41d35d | 41 | #include "udevdb.h" |
a2822451 | 42 | #include "tdb/tdb.h" |
8e41d35d | 43 | |
dbfc520c | 44 | static TDB_CONTEXT *udevdb; |
7e89a569 | 45 | sig_atomic_t gotalarm; |
ca999860 | 46 | |
7a947ce5 | 47 | int udevdb_add_dev(struct udevice *udev) |
ca999860 GKH |
48 | { |
49 | TDB_DATA key, data; | |
5840bc63 | 50 | char keystr[SYSFS_PATH_MAX]; |
ca999860 | 51 | |
5d24c6ca KS |
52 | if (udev->test_run) |
53 | return 0; | |
54 | ||
7e89a569 KS |
55 | if (udevdb == NULL) |
56 | return -1; | |
57 | ||
7a947ce5 KS |
58 | memset(keystr, 0x00, SYSFS_PATH_MAX); |
59 | strfieldcpy(keystr, udev->devpath); | |
5840bc63 | 60 | key.dptr = keystr; |
ca999860 | 61 | key.dsize = strlen(keystr) + 1; |
f7b4eca4 | 62 | |
7a947ce5 KS |
63 | data.dptr = (void *) udev; |
64 | data.dsize = UDEVICE_DB_LEN; | |
65 | dbg("store key '%s' for device '%s'", keystr, udev->name); | |
00866ed2 | 66 | |
5840bc63 | 67 | return tdb_store(udevdb, key, data, TDB_REPLACE); |
ca999860 GKH |
68 | } |
69 | ||
7a947ce5 | 70 | int udevdb_get_dev(const char *path, struct udevice *udev) |
8e41d35d DS |
71 | { |
72 | TDB_DATA key, data; | |
8e41d35d | 73 | |
7e89a569 KS |
74 | if (udevdb == NULL) |
75 | return -1; | |
76 | ||
5840bc63 | 77 | if (path == NULL) |
a56ef382 | 78 | return -ENODEV; |
8e41d35d | 79 | |
5840bc63 GKH |
80 | key.dptr = (void *)path; |
81 | key.dsize = strlen(path) + 1; | |
8e41d35d | 82 | |
dbfc520c | 83 | data = tdb_fetch(udevdb, key); |
8e41d35d | 84 | if (data.dptr == NULL || data.dsize == 0) |
a56ef382 | 85 | return -ENODEV; |
f7b4eca4 | 86 | |
7a947ce5 KS |
87 | memset(udev, 0x00, sizeof(struct udevice)); |
88 | memcpy(udev, data.dptr, UDEVICE_DB_LEN); | |
89 | ||
a56ef382 | 90 | return 0; |
8e41d35d DS |
91 | } |
92 | ||
5840bc63 | 93 | int udevdb_delete_dev(const char *path) |
8e41d35d DS |
94 | { |
95 | TDB_DATA key; | |
5840bc63 | 96 | char keystr[SYSFS_PATH_MAX]; |
8e41d35d | 97 | |
7e89a569 KS |
98 | if (udevdb == NULL) |
99 | return -1; | |
100 | ||
5840bc63 GKH |
101 | if (path == NULL) |
102 | return -EINVAL; | |
a9ce0a41 GKH |
103 | |
104 | memset(keystr, 0, sizeof(keystr)); | |
c472e3c8 | 105 | strfieldcpy(keystr, path); |
a9ce0a41 GKH |
106 | |
107 | key.dptr = keystr; | |
108 | key.dsize = strlen(keystr) + 1; | |
f7b4eca4 | 109 | |
a9ce0a41 GKH |
110 | return tdb_delete(udevdb, key); |
111 | } | |
112 | ||
dbfc520c DS |
113 | /** |
114 | * udevdb_exit: closes database | |
115 | */ | |
116 | void udevdb_exit(void) | |
117 | { | |
5840bc63 GKH |
118 | if (udevdb != NULL) { |
119 | tdb_close(udevdb); | |
120 | udevdb = NULL; | |
121 | } | |
dbfc520c DS |
122 | } |
123 | ||
124 | /** | |
125 | * udevdb_init: initializes database | |
f7b4eca4 KS |
126 | * @init_flag: UDEVDB_INTERNAL - database stays in memory |
127 | * UDEVDB_DEFAULT - database is written to a file | |
dbfc520c DS |
128 | */ |
129 | int udevdb_init(int init_flag) | |
130 | { | |
131 | if (init_flag != UDEVDB_DEFAULT && init_flag != UDEVDB_INTERNAL) | |
5840bc63 | 132 | return -EINVAL; |
dbfc520c | 133 | |
7e89a569 KS |
134 | tdb_set_lock_alarm(&gotalarm); |
135 | ||
c056c514 | 136 | udevdb = tdb_open(udev_db_filename, 0, init_flag, O_RDWR | O_CREAT, 0644); |
5840bc63 GKH |
137 | if (udevdb == NULL) { |
138 | if (init_flag == UDEVDB_INTERNAL) | |
f7b4eca4 | 139 | dbg("unable to initialize in-memory database"); |
5840bc63 | 140 | else |
f7b4eca4 | 141 | dbg("unable to initialize database at '%s'", udev_db_filename); |
ee1db00d | 142 | return -EACCES; |
5840bc63 GKH |
143 | } |
144 | return 0; | |
dbfc520c | 145 | } |
f4dc8d11 KS |
146 | |
147 | /** | |
4070d2fe | 148 | * udevdb_open_ro: open database for reading |
f4dc8d11 KS |
149 | */ |
150 | int udevdb_open_ro(void) | |
151 | { | |
152 | udevdb = tdb_open(udev_db_filename, 0, 0, O_RDONLY, 0); | |
153 | if (udevdb == NULL) { | |
154 | dbg("unable to open database at '%s'", udev_db_filename); | |
ee1db00d KS |
155 | return -EACCES; |
156 | } | |
157 | return 0; | |
158 | } | |
159 | ||
7a947ce5 | 160 | static int (*user_record_callback) (const char *path, struct udevice *dev); |
ee1db00d KS |
161 | |
162 | static int traverse_callback(TDB_CONTEXT *tdb, TDB_DATA key, TDB_DATA dbuf, void *state) | |
163 | { | |
b2a21a35 | 164 | return user_record_callback((char*) key.dptr, (struct udevice*) dbuf.dptr); |
ee1db00d KS |
165 | } |
166 | ||
167 | /** | |
b2a21a35 | 168 | * udevdb_call_foreach: dumps whole database by passing record data to user function |
ee1db00d KS |
169 | * @user_record_handler: user function called for every record in the database |
170 | */ | |
7a947ce5 | 171 | int udevdb_call_foreach(int (*user_record_handler) (const char *path, struct udevice *dev)) |
ee1db00d | 172 | { |
b2a21a35 KS |
173 | int retval = 0; |
174 | ||
7e89a569 KS |
175 | if (udevdb == NULL) |
176 | return -1; | |
177 | ||
ee1db00d KS |
178 | if (user_record_handler == NULL) { |
179 | dbg("invalid user record handling function"); | |
f4dc8d11 KS |
180 | return -EINVAL; |
181 | } | |
ee1db00d | 182 | user_record_callback = user_record_handler; |
b2a21a35 KS |
183 | retval = tdb_traverse(udevdb, traverse_callback, NULL); |
184 | if (retval < 0) | |
185 | return -ENODEV; | |
186 | else | |
187 | return 0; | |
188 | } | |
189 | ||
190 | static struct udevice *find_dev; | |
191 | static char *find_path; | |
192 | static const char *find_name; | |
193 | static int find_found; | |
194 | ||
7a947ce5 | 195 | static int find_device_by_name(const char *path, struct udevice *udev) |
b2a21a35 | 196 | { |
ef672b3d KS |
197 | char *pos; |
198 | int len; | |
9fe3f9a9 | 199 | |
7a947ce5 KS |
200 | if (strncmp(udev->name, find_name, sizeof(udev->name)) == 0) { |
201 | memcpy(find_dev, udev, sizeof(struct udevice)); | |
17794d77 | 202 | strfieldcpymax(find_path, path, NAME_SIZE); |
b2a21a35 KS |
203 | find_found = 1; |
204 | /* stop search */ | |
205 | return 1; | |
206 | } | |
8ea84a8a | 207 | /* look for matching symlink*/ |
7a947ce5 | 208 | foreach_strpart(udev->symlink, " ", pos, len) { |
ef672b3d | 209 | if (strncmp(pos, find_name, len) != 0) |
9fe3f9a9 KS |
210 | continue; |
211 | ||
212 | if (len != strlen(find_name)) | |
213 | continue; | |
214 | ||
7a947ce5 | 215 | memcpy(find_dev, udev, sizeof(struct udevice)); |
17794d77 | 216 | strfieldcpymax(find_path, path, NAME_SIZE); |
9fe3f9a9 KS |
217 | find_found = 1; |
218 | return 1; | |
219 | } | |
f4dc8d11 KS |
220 | return 0; |
221 | } | |
b2a21a35 KS |
222 | |
223 | /** | |
224 | * udevdb_get_dev_byname: search device with given name by traversing the whole database | |
225 | */ | |
226 | int udevdb_get_dev_byname(const char *name, char *path, struct udevice *dev) | |
227 | { | |
228 | find_found = 0; | |
229 | find_path = path; | |
230 | find_dev = dev; | |
231 | find_name = name; | |
232 | udevdb_call_foreach(find_device_by_name); | |
233 | if (find_found == 1) | |
234 | return 0; | |
235 | else | |
236 | return -1; | |
237 | } |