]>
git.ipfire.org Git - thirdparty/systemd.git/blob - udevinfo.c
2 * udevinfo - fetches attributes for a device
4 * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation version 2 of the License.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 675 Mass Ave, Cambridge, MA 02139, USA.
29 #include "libsysfs/sysfs/libsysfs.h"
30 #include "udev_libc_wrapper.h"
32 #include "udev_utils.h"
33 #include "udev_version.h"
39 void log_message (int level
, const char *format
, ...)
43 va_start(args
, format
);
44 vsyslog(level
, format
, args
);
49 static void print_all_attributes(struct dlist
*attr_list
)
51 struct sysfs_attribute
*attr
;
52 char value
[VALUE_SIZE
];
55 dlist_for_each_data(attr_list
, attr
, struct sysfs_attribute
) {
56 if (attr
->value
!= NULL
) {
57 strlcpy(value
, attr
->value
, sizeof(value
));
62 /* remove trailing newline */
63 if (value
[len
-1] == '\n') {
68 /* skip nonprintable values */
70 if (isprint(value
[len
-1]) == 0)
75 printf(" SYSFS{%s}=\"%s\"\n", attr
->name
, value
);
81 static int print_record(struct udevice
*udev
)
83 struct name_entry
*name_loop
;
85 printf("P: %s\n", udev
->devpath
);
86 printf("N: %s\n", udev
->name
);
87 list_for_each_entry(name_loop
, &udev
->symlink_list
, node
)
88 printf("S: %s\n", name_loop
->name
);
101 static int print_device_chain(const char *path
)
103 struct sysfs_class_device
*class_dev
;
104 struct sysfs_class_device
*class_dev_parent
;
105 struct sysfs_attribute
*attr
;
106 struct sysfs_device
*sysfs_dev
;
107 struct sysfs_device
*sysfs_dev_parent
;
108 struct dlist
*attr_list
;
111 /* get the class dev */
112 class_dev
= sysfs_open_class_device_path(path
);
113 if (class_dev
== NULL
) {
114 printf("couldn't get the class device\n");
118 printf("\nudevinfo starts with the device the node belongs to and then walks up the\n"
119 "device chain, to print for every device found, all possibly useful attributes\n"
120 "in the udev key format.\n"
121 "Only attributes within one device section may be used together in one rule,\n"
122 "to match the device for which the node will be created.\n"
125 /* look for the 'dev' file */
126 attr
= sysfs_get_classdev_attr(class_dev
, "dev");
128 printf("device '%s' has major:minor %s", class_dev
->path
, attr
->value
);
130 /* open sysfs class device directory and print all attributes */
131 printf(" looking at class device '%s':\n", class_dev
->path
);
132 printf(" SUBSYSTEM=\"%s\"\n", class_dev
->classname
);
134 attr_list
= sysfs_get_classdev_attributes(class_dev
);
135 if (attr_list
== NULL
) {
136 printf("couldn't open class device directory\n");
140 print_all_attributes(attr_list
);
142 /* get the device link (if parent exists look here) */
143 class_dev_parent
= sysfs_get_classdev_parent(class_dev
);
144 if (class_dev_parent
!= NULL
)
145 sysfs_dev
= sysfs_get_classdev_device(class_dev_parent
);
147 sysfs_dev
= sysfs_get_classdev_device(class_dev
);
149 if (sysfs_dev
!= NULL
)
150 printf("follow the class device's \"device\"\n");
152 /* look the device chain upwards */
153 while (sysfs_dev
!= NULL
) {
154 attr_list
= sysfs_get_device_attributes(sysfs_dev
);
155 if (attr_list
== NULL
) {
156 printf("couldn't open device directory\n");
161 printf(" looking at the device chain at '%s':\n", sysfs_dev
->path
);
162 printf(" BUS=\"%s\"\n", sysfs_dev
->bus
);
163 printf(" ID=\"%s\"\n", sysfs_dev
->bus_id
);
164 printf(" DRIVER=\"%s\"\n", sysfs_dev
->driver_name
);
166 /* open sysfs device directory and print all attributes */
167 print_all_attributes(attr_list
);
169 sysfs_dev_parent
= sysfs_get_device_parent(sysfs_dev
);
170 if (sysfs_dev_parent
== NULL
)
173 sysfs_dev
= sysfs_dev_parent
;
177 sysfs_close_class_device(class_dev
);
181 static int print_dump(const char *devpath
, const char *name
) {
182 printf("%s=%s/%s\n", devpath
, udev_root
, name
);
186 int main(int argc
, char *argv
[], char *envp
[])
188 static const char short_options
[] = "adn:p:q:rVh";
193 enum query_type query
= NONE
;
194 char path
[PATH_SIZE
] = "";
195 char name
[PATH_SIZE
] = "";
196 char temp
[PATH_SIZE
];
197 struct name_entry
*name_loop
;
201 logging_init("udevinfo");
204 udev_init_device(&udev
, NULL
, NULL
);
206 /* get command line options */
208 option
= getopt(argc
, argv
, short_options
);
212 dbg("option '%c'", option
);
215 dbg("udev name: %s\n", optarg
);
216 strlcpy(name
, optarg
, sizeof(name
));
220 dbg("udev path: %s\n", optarg
);
221 strlcpy(path
, optarg
, sizeof(path
));
225 dbg("udev query: %s\n", optarg
);
227 if (strcmp(optarg
, "name") == 0) {
232 if (strcmp(optarg
, "symlink") == 0) {
237 if (strcmp(optarg
, "path") == 0) {
242 if (strcmp(optarg
, "all") == 0) {
247 printf("unknown query type\n");
260 udev_db_dump_names(print_dump
);
264 printf("udevinfo, version %s\n", UDEV_VERSION
);
275 /* process options */
277 if (path
[0] != '\0') {
278 /* remove sysfs_path if given */
279 if (strncmp(path
, sysfs_path
, strlen(sysfs_path
)) == 0) {
280 pos
= path
+ strlen(sysfs_path
);
282 if (path
[0] != '/') {
283 /* prepend '/' if missing */
285 strlcpy(temp
, path
, sizeof(temp
));
291 retval
= udev_db_get_device(&udev
, pos
);
293 printf("device not found in database\n");
299 if (name
[0] != '\0') {
300 char devpath
[PATH_SIZE
];
303 /* remove udev_root if given */
304 len
= strlen(udev_root
);
305 if (strncmp(name
, udev_root
, len
) == 0) {
310 retval
= udev_db_search_name(devpath
, sizeof(devpath
), pos
);
312 printf("device not found in database\n");
315 udev_db_get_device(&udev
, devpath
);
319 printf("query needs device path(-p) or node name(-n) specified\n");
327 printf("%s/%s\n", udev_root
, udev
.name
);
329 printf("%s\n", udev
.name
);
332 if (list_empty(&udev
.symlink_list
))
335 list_for_each_entry(name_loop
, &udev
.symlink_list
, node
)
336 printf("%s/%s ", udev_root
, name_loop
->name
);
338 list_for_each_entry(name_loop
, &udev
.symlink_list
, node
)
339 printf("%s ", name_loop
->name
);
343 printf("%s\n", udev
.devpath
);
354 if (path
[0] == '\0') {
355 printf("attribute walk on device chain needs path(-p) specified\n");
359 if (strncmp(path
, sysfs_path
, strlen(sysfs_path
)) != 0) {
360 /* prepend sysfs mountpoint if not given */
361 snprintf(temp
, sizeof(temp
), "%s%s", sysfs_path
, path
);
362 temp
[sizeof(temp
)-1] = '\0';
363 strlcpy(path
, temp
, sizeof(temp
));
365 print_device_chain(path
);
371 printf("%s\n", udev_root
);
376 printf("Usage: udevinfo [-anpqrVh]\n"
377 " -q TYPE query database for the specified value:\n"
378 " 'name' name of device node\n"
379 " 'symlink' pointing to node\n"
380 " 'path' sysfs device path\n"
381 " 'all' all values\n"
383 " -p PATH sysfs device path used for query or chain\n"
384 " -n NAME node/symlink name used for query\n"
386 " -r print udev root\n"
387 " -a print all SYSFS_attributes along the device chain\n"
388 " -d print the relationship of devpath and the node name for all\n"
389 " devices available in the database\n"
390 " -V print udev version\n"
391 " -h print this help text\n"
395 udev_cleanup_device(&udev
);