2 * udevdb.c - udev database library
6 * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
7 * Copyright (C) 2003 IBM Corp.
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.
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.
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.
24 #define _KLIBC_HAS_ARCH_SIG_ATOMIC_T
35 #include "libsysfs/sysfs/libsysfs.h"
38 #include "udev_version.h"
44 static TDB_CONTEXT *udevdb;
45 sig_atomic_t gotalarm;
47 int udevdb_add_dev(struct udevice *udev)
50 char keystr[SYSFS_PATH_MAX];
58 memset(keystr, 0x00, SYSFS_PATH_MAX);
59 strfieldcpy(keystr, udev->devpath);
61 key.dsize = strlen(keystr) + 1;
63 data.dptr = (void *) udev;
64 data.dsize = UDEVICE_DB_LEN;
65 dbg("store key '%s' for device '%s'", keystr, udev->name);
67 return tdb_store(udevdb, key, data, TDB_REPLACE);
70 int udevdb_get_dev(const char *path, struct udevice *udev)
80 key.dptr = (void *)path;
81 key.dsize = strlen(path) + 1;
83 data = tdb_fetch(udevdb, key);
84 if (data.dptr == NULL || data.dsize == 0)
87 memset(udev, 0x00, sizeof(struct udevice));
88 memcpy(udev, data.dptr, UDEVICE_DB_LEN);
93 int udevdb_delete_dev(const char *path)
96 char keystr[SYSFS_PATH_MAX];
104 memset(keystr, 0, sizeof(keystr));
105 strfieldcpy(keystr, path);
108 key.dsize = strlen(keystr) + 1;
110 return tdb_delete(udevdb, key);
114 * udevdb_exit: closes database
116 void udevdb_exit(void)
118 if (udevdb != NULL) {
125 * udevdb_init: initializes database
126 * @init_flag: UDEVDB_INTERNAL - database stays in memory
127 * UDEVDB_DEFAULT - database is written to a file
129 int udevdb_init(int init_flag)
131 if (init_flag != UDEVDB_DEFAULT && init_flag != UDEVDB_INTERNAL)
134 tdb_set_lock_alarm(&gotalarm);
136 udevdb = tdb_open(udev_db_filename, 0, init_flag, O_RDWR | O_CREAT, 0644);
137 if (udevdb == NULL) {
138 if (init_flag == UDEVDB_INTERNAL)
139 dbg("unable to initialize in-memory database");
141 dbg("unable to initialize database at '%s'", udev_db_filename);
148 * udevdb_open_ro: open database for reading
150 int udevdb_open_ro(void)
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);
160 static int (*user_record_callback) (const char *path, struct udevice *dev);
162 static int traverse_callback(TDB_CONTEXT *tdb, TDB_DATA key, TDB_DATA dbuf, void *state)
164 return user_record_callback((char*) key.dptr, (struct udevice*) dbuf.dptr);
168 * udevdb_call_foreach: dumps whole database by passing record data to user function
169 * @user_record_handler: user function called for every record in the database
171 int udevdb_call_foreach(int (*user_record_handler) (const char *path, struct udevice *dev))
178 if (user_record_handler == NULL) {
179 dbg("invalid user record handling function");
182 user_record_callback = user_record_handler;
183 retval = tdb_traverse(udevdb, traverse_callback, NULL);
190 static struct udevice *find_dev;
191 static char *find_path;
192 static const char *find_name;
193 static int find_found;
195 static int find_device_by_name(const char *path, struct udevice *udev)
200 if (strncmp(udev->name, find_name, sizeof(udev->name)) == 0) {
201 memcpy(find_dev, udev, sizeof(struct udevice));
202 strfieldcpymax(find_path, path, NAME_SIZE);
207 /* look for matching symlink*/
208 foreach_strpart(udev->symlink, " ", pos, len) {
209 if (strncmp(pos, find_name, len) != 0)
212 if (len != strlen(find_name))
215 memcpy(find_dev, udev, sizeof(struct udevice));
216 strfieldcpymax(find_path, path, NAME_SIZE);
224 * udevdb_get_dev_byname: search device with given name by traversing the whole database
226 int udevdb_get_dev_byname(const char *name, char *path, struct udevice *dev)
232 udevdb_call_foreach(find_device_by_name);