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git.ipfire.org Git - thirdparty/systemd.git/blob - udevdb.c
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.
25 * udev database library
27 #define _KLIBC_HAS_ARCH_SIG_ATOMIC_T
36 #include "libsysfs/sysfs/libsysfs.h"
37 #include "udev_version.h"
44 static TDB_CONTEXT
*udevdb
;
47 int udevdb_add_dev(const char *path
, const struct udevice
*dev
)
50 char keystr
[SYSFS_PATH_MAX
];
52 if ((path
== NULL
) || (dev
== NULL
))
55 memset(keystr
, 0, NAME_SIZE
);
58 key
.dsize
= strlen(keystr
) + 1;
60 data
.dptr
= (void *)dev
;
61 data
.dsize
= UDEVICE_LEN
;
63 return tdb_store(udevdb
, key
, data
, TDB_REPLACE
);
66 int udevdb_get_dev(const char *path
, struct udevice
*dev
)
73 key
.dptr
= (void *)path
;
74 key
.dsize
= strlen(path
) + 1;
76 data
= tdb_fetch(udevdb
, key
);
77 if (data
.dptr
== NULL
|| data
.dsize
== 0)
80 memset(dev
, 0, sizeof(struct udevice
));
81 memcpy(dev
, data
.dptr
, UDEVICE_LEN
);
85 int udevdb_delete_dev(const char *path
)
88 char keystr
[SYSFS_PATH_MAX
];
93 memset(keystr
, 0, sizeof(keystr
));
97 key
.dsize
= strlen(keystr
) + 1;
99 return tdb_delete(udevdb
, key
);
103 * udevdb_exit: closes database
105 void udevdb_exit(void)
107 if (udevdb
!= NULL
) {
114 * udevdb_init: initializes database
115 * @init_flag: UDEVDB_INTERNAL - database stays in memory
116 * UDEVDB_DEFAULT - database is written to a file
118 int udevdb_init(int init_flag
)
120 if (init_flag
!= UDEVDB_DEFAULT
&& init_flag
!= UDEVDB_INTERNAL
)
123 udevdb
= tdb_open(udev_db_filename
, 0, init_flag
, O_RDWR
| O_CREAT
, 0644);
124 if (udevdb
== NULL
) {
125 if (init_flag
== UDEVDB_INTERNAL
)
126 dbg("unable to initialize in-memory database");
128 dbg("unable to initialize database at '%s'", udev_db_filename
);
135 * udevdb_open_ro: open database for reading
137 int udevdb_open_ro(void)
139 udevdb
= tdb_open(udev_db_filename
, 0, 0, O_RDONLY
, 0);
140 if (udevdb
== NULL
) {
141 dbg("unable to open database at '%s'", udev_db_filename
);
147 static int (*user_record_callback
) (char *path
, struct udevice
*dev
);
149 static int traverse_callback(TDB_CONTEXT
*tdb
, TDB_DATA key
, TDB_DATA dbuf
, void *state
)
151 return user_record_callback((char*) key
.dptr
, (struct udevice
*) dbuf
.dptr
);
155 * udevdb_call_foreach: dumps whole database by passing record data to user function
156 * @user_record_handler: user function called for every record in the database
158 int udevdb_call_foreach(int (*user_record_handler
) (char *path
, struct udevice
*dev
))
162 if (user_record_handler
== NULL
) {
163 dbg("invalid user record handling function");
166 user_record_callback
= user_record_handler
;
167 retval
= tdb_traverse(udevdb
, traverse_callback
, NULL
);
174 static struct udevice
*find_dev
;
175 static char *find_path
;
176 static const char *find_name
;
177 static int find_found
;
179 static int find_device_by_name(char *path
, struct udevice
*dev
)
181 if (strncmp(dev
->name
, find_name
, sizeof(dev
->name
)) == 0) {
182 memcpy(find_dev
, dev
, sizeof(*find_dev
));
183 strncpy(find_path
, path
, NAME_SIZE
);
192 * udevdb_get_dev_byname: search device with given name by traversing the whole database
194 int udevdb_get_dev_byname(const char *name
, char *path
, struct udevice
*dev
)
200 udevdb_call_foreach(find_device_by_name
);