2 * udevinfo - fetches attributes for a device
4 * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation version 2 of the License.
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
16 * You should have received a copy of the GNU General Public License along
17 * with this program; if not, write to the Free Software Foundation, Inc.,
18 * 675 Mass Ave, Cambridge, MA 02139, USA.
30 #include "libsysfs/sysfs/libsysfs.h"
31 #include "libsysfs/dlist.h"
33 #include "udev_version.h"
38 # define SYSFS_VALUE_MAX 200
44 unsigned char logname[42];
45 void log_message (int level, const char *format, ...)
49 va_start(args, format);
50 vsyslog(level, format, args);
55 static int print_all_attributes(const char *path)
57 struct dlist *attributes;
58 struct sysfs_attribute *attr;
59 struct sysfs_directory *sysfs_dir;
60 char value[SYSFS_VALUE_MAX];
64 sysfs_dir = sysfs_open_directory(path);
65 if (sysfs_dir == NULL)
68 attributes = sysfs_get_dir_attributes(sysfs_dir);
69 if (attributes == NULL) {
74 dlist_for_each_data(attributes, attr, struct sysfs_attribute) {
75 if (attr->value != NULL) {
76 strfieldcpy(value, attr->value);
81 /* remove trailing newline */
82 if (value[len-1] == '\n') {
87 /* skip nonprintable values */
89 if (isprint(value[len-1]) == 0)
94 printf(" SYSFS{%s}=\"%s\"\n", attr->name, value);
100 sysfs_close_directory(sysfs_dir);
105 /* callback for database dump */
106 static int print_record(char *path, struct udevice *dev)
108 printf("P: %s\n", path);
109 printf("N: %s\n", dev->name);
110 printf("M: %#o\n", dev->mode);
111 printf("S: %s\n", dev->symlink);
112 printf("O: %s\n", dev->owner);
113 printf("G: %s\n", dev->group);
128 static int print_device_chain(const char *path)
130 struct sysfs_class_device *class_dev;
131 struct sysfs_class_device *class_dev_parent;
132 struct sysfs_attribute *attr;
133 struct sysfs_device *sysfs_dev;
134 struct sysfs_device *sysfs_dev_parent;
137 /* get the class dev */
138 class_dev = sysfs_open_class_device_path(path);
139 if (class_dev == NULL) {
140 printf("couldn't get the class device\n");
144 /* read the 'dev' file for major/minor*/
145 attr = sysfs_get_classdev_attr(class_dev, "dev");
147 printf("couldn't get the \"dev\" file\n");
151 printf("\ndevice '%s' has major:minor %s", class_dev->path, attr->value);
152 sysfs_close_attribute(attr);
154 /* open sysfs class device directory and print all attributes */
155 printf(" looking at class device '%s':\n", class_dev->path);
156 if (print_all_attributes(class_dev->path) != 0) {
157 printf("couldn't open class device directory\n");
162 /* get the device link (if parent exists look here) */
163 class_dev_parent = sysfs_get_classdev_parent(class_dev);
164 if (class_dev_parent != NULL) {
165 //sysfs_close_class_device(class_dev);
166 class_dev = class_dev_parent;
168 sysfs_dev = sysfs_get_classdev_device(class_dev);
169 if (sysfs_dev != NULL)
170 printf("follow the class device's \"device\"\n");
172 /* look the device chain upwards */
173 while (sysfs_dev != NULL) {
174 printf(" looking at the device chain at '%s':\n", sysfs_dev->path);
175 printf(" BUS=\"%s\"\n", sysfs_dev->bus);
176 printf(" ID=\"%s\"\n", sysfs_dev->bus_id);
178 /* open sysfs device directory and print all attributes */
179 print_all_attributes(sysfs_dev->path);
181 sysfs_dev_parent = sysfs_get_device_parent(sysfs_dev);
182 if (sysfs_dev_parent == NULL)
185 //sysfs_close_device(sysfs_dev);
186 sysfs_dev = sysfs_dev_parent;
188 sysfs_close_device(sysfs_dev);
191 //sysfs_close_class_device(class_dev);
195 static int process_options(void)
197 static const char short_options[] = "adn:p:q:rVh";
203 enum query_type query = NONE;
204 char result[NAME_SIZE] = "";
205 char path[NAME_SIZE] = "";
206 char name[NAME_SIZE] = "";
207 char temp[NAME_SIZE];
210 /* get command line options */
212 option = getopt(main_argc, main_argv, short_options);
216 dbg("option '%c'", option);
219 dbg("udev name: %s\n", optarg);
220 strfieldcpy(name, optarg);
224 dbg("udev path: %s\n", optarg);
225 strfieldcpy(path, optarg);
229 dbg("udev query: %s\n", optarg);
231 if (strcmp(optarg, "name") == 0) {
236 if (strcmp(optarg, "symlink") == 0) {
241 if (strcmp(optarg, "mode") == 0) {
246 if (strcmp(optarg, "owner") == 0) {
251 if (strcmp(optarg, "group") == 0) {
256 if (strcmp(optarg, "path") == 0) {
261 printf("unknown query type\n");
273 retval = udevdb_open_ro();
275 printf("unable to open udev database\n");
278 udevdb_call_foreach(print_record);
283 printf("udevinfo, version %s\n", UDEV_VERSION);
294 /* process options */
296 retval = udevdb_open_ro();
298 printf("unable to open udev database\n");
302 if (path[0] != '\0') {
303 /* remove sysfs_path if given */
304 if (strncmp(path, sysfs_path, strlen(sysfs_path)) == 0) {
305 pos = path + strlen(sysfs_path);
307 if (path[0] != '/') {
308 /* prepend '/' if missing */
309 strfieldcat(temp, "/");
310 strfieldcat(temp, path);
316 retval = udevdb_get_dev(pos, &dev);
318 printf("device not found in database\n");
324 if (name[0] != '\0') {
325 /* remove udev_root if given */
326 if (strncmp(name, udev_root, strlen(udev_root)) == 0) {
327 pos = name + strlen(udev_root);
330 retval = udevdb_get_dev_byname(pos, path, &dev);
332 printf("device not found in database\n");
338 printf("query needs device path(-p) or node name(-n) specified\n");
345 strfieldcpy(result, udev_root);
346 strfieldcat(result, dev.name);
350 strfieldcpy(result, dev.symlink);
354 sprintf(result, "%#o", dev.mode);
358 strfieldcpy(result, dev.group);
362 strfieldcpy(result, dev.owner);
366 strfieldcpy(result, path);
372 printf("%s\n", result);
380 if (path[0] == '\0') {
381 printf("attribute walk on device chain needs path(-p) specified\n");
384 if (strncmp(path, sysfs_path, strlen(sysfs_path)) != 0) {
385 /* prepend sysfs mountpoint if not given */
386 strfieldcpy(temp, path);
387 strfieldcpy(path, sysfs_path);
388 strfieldcat(path, temp);
390 print_device_chain(path);
396 printf("%s\n", udev_root);
401 printf("Usage: [-anpqrdVh]\n"
402 " -q TYPE query database for the specified value:\n"
403 " 'name' name of device node\n"
404 " 'symlink' pointing to node\n"
405 " 'mode' permissions of node\n"
408 " 'path' sysfs device path\n"
409 " -p PATH sysfs device path used for query or chain\n"
410 " -n NAME node name used for query\n"
412 " -r print udev root\n"
413 " -a print all SYSFS_attributes along the device chain\n"
414 " -d dump whole database\n"
415 " -V print udev version\n"
416 " -h print this help text\n"
421 int main(int argc, char *argv[], char *envp[])
428 init_logging("udevinfo");
430 /* initialize our configuration */
433 retval = process_options();