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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 | ||
8e41d35d DS |
24 | #include <stdlib.h> |
25 | #include <stdio.h> | |
8ea84a8a | 26 | #include <string.h> |
c81b35c0 | 27 | #include <stddef.h> |
8e41d35d DS |
28 | #include <fcntl.h> |
29 | #include <string.h> | |
30 | #include <sys/stat.h> | |
31 | #include <errno.h> | |
a2822451 | 32 | #include <signal.h> |
8e41d35d | 33 | |
c80da508 | 34 | #include "libsysfs/sysfs/libsysfs.h" |
6739707d | 35 | #include "udev.h" |
c81b35c0 KS |
36 | #include "udev_lib.h" |
37 | #include "udev_version.h" | |
54988802 | 38 | #include "logging.h" |
6739707d | 39 | #include "namedev.h" |
8e41d35d | 40 | #include "udevdb.h" |
a2822451 | 41 | #include "tdb/tdb.h" |
8e41d35d | 42 | |
dbfc520c | 43 | static TDB_CONTEXT *udevdb; |
7e89a569 | 44 | sig_atomic_t gotalarm; |
ca999860 | 45 | |
7a947ce5 | 46 | int udevdb_add_dev(struct udevice *udev) |
ca999860 GKH |
47 | { |
48 | TDB_DATA key, data; | |
5840bc63 | 49 | char keystr[SYSFS_PATH_MAX]; |
ca999860 | 50 | |
5d24c6ca KS |
51 | if (udev->test_run) |
52 | return 0; | |
53 | ||
7e89a569 KS |
54 | if (udevdb == NULL) |
55 | return -1; | |
56 | ||
7a947ce5 KS |
57 | memset(keystr, 0x00, SYSFS_PATH_MAX); |
58 | strfieldcpy(keystr, udev->devpath); | |
5840bc63 | 59 | key.dptr = keystr; |
ca999860 | 60 | key.dsize = strlen(keystr) + 1; |
f7b4eca4 | 61 | |
7a947ce5 KS |
62 | data.dptr = (void *) udev; |
63 | data.dsize = UDEVICE_DB_LEN; | |
64 | dbg("store key '%s' for device '%s'", keystr, udev->name); | |
00866ed2 | 65 | |
5840bc63 | 66 | return tdb_store(udevdb, key, data, TDB_REPLACE); |
ca999860 GKH |
67 | } |
68 | ||
7a947ce5 | 69 | int udevdb_get_dev(const char *path, struct udevice *udev) |
8e41d35d DS |
70 | { |
71 | TDB_DATA key, data; | |
8e41d35d | 72 | |
7e89a569 KS |
73 | if (udevdb == NULL) |
74 | return -1; | |
75 | ||
5840bc63 | 76 | if (path == NULL) |
a56ef382 | 77 | return -ENODEV; |
8e41d35d | 78 | |
5840bc63 GKH |
79 | key.dptr = (void *)path; |
80 | key.dsize = strlen(path) + 1; | |
8e41d35d | 81 | |
dbfc520c | 82 | data = tdb_fetch(udevdb, key); |
8e41d35d | 83 | if (data.dptr == NULL || data.dsize == 0) |
a56ef382 | 84 | return -ENODEV; |
f7b4eca4 | 85 | |
7a947ce5 KS |
86 | memset(udev, 0x00, sizeof(struct udevice)); |
87 | memcpy(udev, data.dptr, UDEVICE_DB_LEN); | |
88 | ||
a56ef382 | 89 | return 0; |
8e41d35d DS |
90 | } |
91 | ||
5840bc63 | 92 | int udevdb_delete_dev(const char *path) |
8e41d35d DS |
93 | { |
94 | TDB_DATA key; | |
5840bc63 | 95 | char keystr[SYSFS_PATH_MAX]; |
8e41d35d | 96 | |
7e89a569 KS |
97 | if (udevdb == NULL) |
98 | return -1; | |
99 | ||
5840bc63 GKH |
100 | if (path == NULL) |
101 | return -EINVAL; | |
a9ce0a41 GKH |
102 | |
103 | memset(keystr, 0, sizeof(keystr)); | |
c472e3c8 | 104 | strfieldcpy(keystr, path); |
a9ce0a41 GKH |
105 | |
106 | key.dptr = keystr; | |
107 | key.dsize = strlen(keystr) + 1; | |
f7b4eca4 | 108 | |
a9ce0a41 GKH |
109 | return tdb_delete(udevdb, key); |
110 | } | |
111 | ||
dbfc520c DS |
112 | /** |
113 | * udevdb_exit: closes database | |
114 | */ | |
115 | void udevdb_exit(void) | |
116 | { | |
5840bc63 GKH |
117 | if (udevdb != NULL) { |
118 | tdb_close(udevdb); | |
119 | udevdb = NULL; | |
120 | } | |
dbfc520c DS |
121 | } |
122 | ||
123 | /** | |
124 | * udevdb_init: initializes database | |
f7b4eca4 KS |
125 | * @init_flag: UDEVDB_INTERNAL - database stays in memory |
126 | * UDEVDB_DEFAULT - database is written to a file | |
dbfc520c DS |
127 | */ |
128 | int udevdb_init(int init_flag) | |
129 | { | |
130 | if (init_flag != UDEVDB_DEFAULT && init_flag != UDEVDB_INTERNAL) | |
5840bc63 | 131 | return -EINVAL; |
dbfc520c | 132 | |
7e89a569 KS |
133 | tdb_set_lock_alarm(&gotalarm); |
134 | ||
c056c514 | 135 | udevdb = tdb_open(udev_db_filename, 0, init_flag, O_RDWR | O_CREAT, 0644); |
5840bc63 GKH |
136 | if (udevdb == NULL) { |
137 | if (init_flag == UDEVDB_INTERNAL) | |
f7b4eca4 | 138 | dbg("unable to initialize in-memory database"); |
5840bc63 | 139 | else |
f7b4eca4 | 140 | dbg("unable to initialize database at '%s'", udev_db_filename); |
ee1db00d | 141 | return -EACCES; |
5840bc63 GKH |
142 | } |
143 | return 0; | |
dbfc520c | 144 | } |
f4dc8d11 KS |
145 | |
146 | /** | |
4070d2fe | 147 | * udevdb_open_ro: open database for reading |
f4dc8d11 KS |
148 | */ |
149 | int udevdb_open_ro(void) | |
150 | { | |
151 | udevdb = tdb_open(udev_db_filename, 0, 0, O_RDONLY, 0); | |
152 | if (udevdb == NULL) { | |
153 | dbg("unable to open database at '%s'", udev_db_filename); | |
ee1db00d KS |
154 | return -EACCES; |
155 | } | |
156 | return 0; | |
157 | } | |
158 | ||
7a947ce5 | 159 | static int (*user_record_callback) (const char *path, struct udevice *dev); |
ee1db00d KS |
160 | |
161 | static int traverse_callback(TDB_CONTEXT *tdb, TDB_DATA key, TDB_DATA dbuf, void *state) | |
162 | { | |
b2a21a35 | 163 | return user_record_callback((char*) key.dptr, (struct udevice*) dbuf.dptr); |
ee1db00d KS |
164 | } |
165 | ||
166 | /** | |
b2a21a35 | 167 | * udevdb_call_foreach: dumps whole database by passing record data to user function |
ee1db00d KS |
168 | * @user_record_handler: user function called for every record in the database |
169 | */ | |
7a947ce5 | 170 | int udevdb_call_foreach(int (*user_record_handler) (const char *path, struct udevice *dev)) |
ee1db00d | 171 | { |
b2a21a35 KS |
172 | int retval = 0; |
173 | ||
7e89a569 KS |
174 | if (udevdb == NULL) |
175 | return -1; | |
176 | ||
ee1db00d KS |
177 | if (user_record_handler == NULL) { |
178 | dbg("invalid user record handling function"); | |
f4dc8d11 KS |
179 | return -EINVAL; |
180 | } | |
ee1db00d | 181 | user_record_callback = user_record_handler; |
b2a21a35 KS |
182 | retval = tdb_traverse(udevdb, traverse_callback, NULL); |
183 | if (retval < 0) | |
184 | return -ENODEV; | |
185 | else | |
186 | return 0; | |
187 | } | |
188 | ||
189 | static struct udevice *find_dev; | |
190 | static char *find_path; | |
191 | static const char *find_name; | |
192 | static int find_found; | |
193 | ||
7a947ce5 | 194 | static int find_device_by_name(const char *path, struct udevice *udev) |
b2a21a35 | 195 | { |
ef672b3d KS |
196 | char *pos; |
197 | int len; | |
9fe3f9a9 | 198 | |
7a947ce5 KS |
199 | if (strncmp(udev->name, find_name, sizeof(udev->name)) == 0) { |
200 | memcpy(find_dev, udev, sizeof(struct udevice)); | |
17794d77 | 201 | strfieldcpymax(find_path, path, NAME_SIZE); |
b2a21a35 KS |
202 | find_found = 1; |
203 | /* stop search */ | |
204 | return 1; | |
205 | } | |
8ea84a8a | 206 | /* look for matching symlink*/ |
7a947ce5 | 207 | foreach_strpart(udev->symlink, " ", pos, len) { |
ef672b3d | 208 | if (strncmp(pos, find_name, len) != 0) |
9fe3f9a9 KS |
209 | continue; |
210 | ||
211 | if (len != strlen(find_name)) | |
212 | continue; | |
213 | ||
7a947ce5 | 214 | memcpy(find_dev, udev, sizeof(struct udevice)); |
17794d77 | 215 | strfieldcpymax(find_path, path, NAME_SIZE); |
9fe3f9a9 KS |
216 | find_found = 1; |
217 | return 1; | |
218 | } | |
f4dc8d11 KS |
219 | return 0; |
220 | } | |
b2a21a35 KS |
221 | |
222 | /** | |
223 | * udevdb_get_dev_byname: search device with given name by traversing the whole database | |
224 | */ | |
225 | int udevdb_get_dev_byname(const char *name, char *path, struct udevice *dev) | |
226 | { | |
227 | find_found = 0; | |
228 | find_path = path; | |
229 | find_dev = dev; | |
230 | find_name = name; | |
231 | udevdb_call_foreach(find_device_by_name); | |
232 | if (find_found == 1) | |
233 | return 0; | |
234 | else | |
235 | return -1; | |
236 | } |