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