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git.ipfire.org Git - thirdparty/systemd.git/blob - udev_db.c
6 * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
7 * Copyright (C) 2004-2005 Kay Sievers <kay.sievers@vrfy.org>
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.
35 #include "libsysfs/sysfs/libsysfs.h"
36 #include "udev_libc_wrapper.h"
38 #include "udev_utils.h"
42 #define PATH_TO_NAME_CHAR '@'
44 static int get_db_filename(const char *devpath
, char *filename
, int len
)
49 /* replace '/' to transform path into a filename */
50 strlcpy(temp
, devpath
, sizeof(temp
));
51 pos
= strchr(&temp
[1], '/');
53 pos
[0] = PATH_TO_NAME_CHAR
;
54 pos
= strchr(&pos
[1], '/');
56 snprintf(filename
, len
, "%s%s", udev_db_path
, temp
);
57 filename
[len
-1] = '\0';
62 int udev_db_add_device(struct udevice
*udev
)
64 char filename
[PATH_SIZE
];
65 struct name_entry
*name_loop
;
71 /* don't write anything if udev created only the node with the
72 * kernel name without any interesting data to remember
74 if (strcmp(udev
->name
, udev
->kernel_name
) == 0 &&
75 list_empty(&udev
->symlink_list
) && list_empty(&udev
->env_list
) &&
76 !udev
->partitions
&& !udev
->ignore_remove
) {
77 dbg("nothing interesting to store in udevdb, skip");
81 get_db_filename(udev
->devpath
, filename
, sizeof(filename
));
82 create_path(filename
);
83 f
= fopen(filename
, "w");
85 err("unable to create db file '%s'", filename
);
88 dbg("storing data for device '%s' in '%s'", udev
->devpath
, filename
);
90 fprintf(f
, "P:%s\n", udev
->devpath
);
91 fprintf(f
, "N:%s\n", udev
->name
);
92 list_for_each_entry(name_loop
, &udev
->symlink_list
, node
)
93 fprintf(f
, "S:%s\n", name_loop
->name
);
94 fprintf(f
, "M:%u:%u\n", major(udev
->devt
), minor(udev
->devt
));
96 fprintf(f
, "A:%u\n", udev
->partitions
);
97 if (udev
->ignore_remove
)
98 fprintf(f
, "R:%u\n", udev
->ignore_remove
);
99 list_for_each_entry(name_loop
, &udev
->env_list
, node
)
100 fprintf(f
, "E:%s\n", name_loop
->name
);
107 static int parse_db_file(struct udevice
*udev
, const char *filename
)
109 char line
[PATH_SIZE
];
110 unsigned int major
, minor
;
117 if (file_map(filename
, &buf
, &bufsize
) != 0) {
118 err("unable to read db file '%s'", filename
);
123 while (cur
< bufsize
) {
124 count
= buf_get_line(buf
, bufsize
, cur
);
130 if (count
> sizeof(udev
->devpath
))
131 count
= sizeof(udev
->devpath
);
132 strlcpy(udev
->devpath
, &bufline
[2], count
-1);
135 if (count
> sizeof(udev
->name
))
136 count
= sizeof(udev
->name
);
137 strlcpy(udev
->name
, &bufline
[2], count
-1);
140 if (count
> sizeof(line
))
141 count
= sizeof(line
);
142 strlcpy(line
, &bufline
[2], count
-1);
143 sscanf(line
, "%u:%u", &major
, &minor
);
144 udev
->devt
= makedev(major
, minor
);
147 if (count
> sizeof(line
))
148 count
= sizeof(line
);
149 strlcpy(line
, &bufline
[2], count
-1);
150 name_list_add(&udev
->symlink_list
, line
, 0);
153 if (count
> sizeof(line
))
154 count
= sizeof(line
);
155 strlcpy(line
, &bufline
[2], count
-1);
156 udev
->partitions
= atoi(line
);
159 if (count
> sizeof(line
))
160 count
= sizeof(line
);
161 strlcpy(line
, &bufline
[2], count
-1);
162 udev
->ignore_remove
= atoi(line
);
165 if (count
> sizeof(line
))
166 count
= sizeof(line
);
167 strlcpy(line
, &bufline
[2], count
-1);
168 name_list_add(&udev
->env_list
, line
, 0);
172 file_unmap(buf
, bufsize
);
174 if (udev
->name
[0] == '\0')
180 int udev_db_delete_device(struct udevice
*udev
)
182 char filename
[PATH_SIZE
];
184 get_db_filename(udev
->devpath
, filename
, sizeof(filename
));
190 int udev_db_get_device(struct udevice
*udev
, const char *devpath
)
192 char filename
[PATH_SIZE
];
194 get_db_filename(devpath
, filename
, sizeof(filename
));
196 if (parse_db_file(udev
, filename
) != 0)
202 int udev_db_search_name(char *devpath
, size_t len
, const char *name
)
206 dir
= opendir(udev_db_path
);
208 err("unable to open udev_db '%s'", udev_db_path
);
214 char filename
[PATH_SIZE
];
215 char path
[PATH_SIZE
];
216 char nodename
[PATH_SIZE
];
224 if (ent
== NULL
|| ent
->d_name
[0] == '\0')
227 if (ent
->d_name
[0] == '.')
230 snprintf(filename
, sizeof(filename
), "%s/%s", udev_db_path
, ent
->d_name
);
231 filename
[sizeof(filename
)-1] = '\0';
232 dbg("looking at '%s'", filename
);
234 if (file_map(filename
, &buf
, &bufsize
) != 0) {
235 err("unable to read db file '%s'", filename
);
240 while (cur
< bufsize
) {
241 count
= buf_get_line(buf
, bufsize
, cur
);
247 if (count
> sizeof(path
))
248 count
= sizeof(path
);
249 strlcpy(path
, &bufline
[2], count
-1);
253 if (count
> sizeof(nodename
))
254 count
= sizeof(nodename
);
255 strlcpy(nodename
, &bufline
[2], count
-1);
256 dbg("compare '%s' '%s'", nodename
, name
);
257 if (strcmp(nodename
, name
) == 0) {
258 strlcpy(devpath
, path
, len
);
259 file_unmap(buf
, bufsize
);
268 file_unmap(buf
, bufsize
);
275 int udev_db_dump_names(int (*handler_function
)(const char *path
, const char *name
))
279 dir
= opendir(udev_db_path
);
281 err("unable to open udev_db '%s'", udev_db_path
);
287 char filename
[PATH_SIZE
];
288 char path
[PATH_SIZE
];
289 char nodename
[PATH_SIZE
];
297 if (ent
== NULL
|| ent
->d_name
[0] == '\0')
300 if (ent
->d_name
[0] == '.')
303 snprintf(filename
, sizeof(filename
), "%s/%s", udev_db_path
, ent
->d_name
);
304 filename
[sizeof(filename
)-1] = '\0';
305 dbg("looking at '%s'", filename
);
307 if (file_map(filename
, &buf
, &bufsize
) != 0) {
308 err("unable to read db file '%s'", filename
);
315 while (cur
< bufsize
) {
316 count
= buf_get_line(buf
, bufsize
, cur
);
322 if (count
> sizeof(path
))
323 count
= sizeof(path
);
324 strlcpy(path
, &bufline
[2], count
-1);
327 if (count
> sizeof(nodename
))
328 count
= sizeof(nodename
);
329 strlcpy(nodename
, &bufline
[2], count
-1);
335 file_unmap(buf
, bufsize
);
337 if (path
[0] == '\0' || nodename
[0] == '\0')
340 if (handler_function(path
, nodename
) != 0)