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[PATCH] udevinfo - now a real program :) 

I want to make udevinfo the standard query interface, so all the user
features of the main udev are copied in here. It is now capable to:

  o query the database for a given value
  o dump the whole database
  o extract all possible device attributes for a sysfs_device


In addition to the known options of udev it supports the query for the
mode of the device node, and it includes the mode in the database dump:

  udevinfo -d
  P: /class/video4linux/video0
  N: video/webcam0
  M: 0666
  S: camera0 kamera0
  O: 500
  G: 500


It is also a bit more friendly with the pathnames specified for devices or nodes.
We remove the absolute path or add it if neccessary:

  udevinfo -q mode -n video/webcam0
  udevinfo -q mode -n /udev/video/webcam0
  0666

  udevinfo -q mode -p /sys/class/video4linux/video0
  udevinfo -q mode -p /class/video4linux/video0
  udevinfo -q mode -p class/video4linux/video0
  0666
This commit is contained in:
kay.sievers@vrfy.org 2004-01-26 18:20:12 -08:00 committed by Greg KH
parent a695feaeff
commit 87171e46cd
2 changed files with 301 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

28
extras/udevinfo/Makefile
View File

@ -1,14 +1,28 @@
PROG=udevinfo
LD=$(CC)
OBJS=udevinfo.o
OBJS= ../../udev_config.o \
../../udev-add.o \
../../udev-remove.o \
../../udevdb.o \
../../logging.o \
../../namedev.o \
../../namedev_parse.o \
../../libsysfs/sysfs_bus.o \
../../libsysfs/sysfs_class.o \
../../libsysfs/sysfs_device.o \
../../libsysfs/sysfs_dir.o \
../../libsysfs/sysfs_driver.o \
../../libsysfs/sysfs_utils.o \
../../libsysfs/dlist.o \
../../tdb/tdb.o \
../../tdb/spinlock.o \
all: $(PROG)
all: $(PROG)
$(PROG): $(PROG).o
$(LD) $(LDFLAGS) -o $(PROG) $(PROG).o $(OBJS) -lc
clean:
rm -f $(PROG) $(OBJS)
$(PROG): $(OBJS)
$(LD) $(LDFLAGS) -o $(PROG) $(CRT0) $(OBJS) $(SYSFS)
rm -f $(PROG) $(OBJS) $(PROG).o
me:
cd ../..; make EXTRAS=extras/udevinfo

295
extras/udevinfo/udevinfo.c
View File

@ -23,21 +23,29 @@
#include <string.h>
#include <stdio.h>
#include <ctype.h>
#include <stdarg.h>
#include <unistd.h>
#include <errno.h>
#include "libsysfs.h"
#include "../../udev.h"
#include "../../udev_version.h"
#include "../../logging.h"
#include "../../udevdb.h"
#include "../../libsysfs/libsysfs.h"
# define VALUE_SIZE 200
# define SYSFS_VALUE_MAX 200
char **main_argv;
int main_argc;
char **main_envp;
static int print_all_attributes(char *path)
static int print_all_attributes(const char *path)
{
struct dlist *attributes;
struct sysfs_attribute *attr;
struct sysfs_directory *sysfs_dir;
char value[VALUE_SIZE];
char value[SYSFS_VALUE_MAX];
int len;
int retval = 0;
@ -53,7 +61,7 @@ static int print_all_attributes(char *path)
dlist_for_each_data(attributes, attr, struct sysfs_attribute) {
if (attr->value != NULL) {
strncpy(value, attr->value, VALUE_SIZE);
strncpy(value, attr->value, SYSFS_VALUE_MAX);
len = strlen(value);
if (len == 0)
continue;
@ -82,24 +90,38 @@ exit:
return retval;
}
int main(int argc, char **argv, char **envp)
/* callback for database dump */
static int print_record(char *path, struct udevice *dev)
{
printf("P: %s\n", path);
printf("N: %s\n", dev->name);
printf("M: %#o\n", dev->mode);
printf("S: %s\n", dev->symlink);
printf("O: %s\n", dev->owner);
printf("G: %s\n", dev->group);
printf("\n");
return 0;
}
enum query_type {
NONE,
NAME,
PATH,
SYMLINK,
MODE,
OWNER,
GROUP
};
static int print_device_chain(const char *path)
{
main_argv = argv;
main_envp = envp;
struct sysfs_class_device *class_dev;
struct sysfs_class_device *class_dev_parent;
struct sysfs_attribute *attr;
struct sysfs_device *sysfs_dev;
struct sysfs_device *sysfs_dev_parent;
char *path;
int retval = 0;
if (argc != 2) {
printf("Usage: udevinfo <sysfs_device_path>\n");
return -1;
}
path = argv[1];
/* get the class dev */
class_dev = sysfs_open_class_device_path(path);
if (class_dev == NULL) {
@ -157,3 +179,246 @@ exit:
//sysfs_close_class_device(class_dev);
return retval;
}
static int process_options(void)
{
static const char short_options[] = "adn:p:q:rVh";
int option;
int retval = 1;
struct udevice dev;
int root = 0;
int attributes = 0;
enum query_type query = NONE;
char result[NAME_SIZE] = "";
char path[NAME_SIZE] = "";
char name[NAME_SIZE] = "";
char temp[NAME_SIZE];
char *pos;
/* get command line options */
while (1) {
option = getopt(main_argc, main_argv, short_options);
if (option == -1)
break;
dbg("option '%c'", option);
switch (option) {
case 'n':
dbg("udev name: %s\n", optarg);
strfieldcpy(name, optarg);
break;
case 'p':
dbg("udev path: %s\n", optarg);
strfieldcpy(path, optarg);
break;
case 'q':
dbg("udev query: %s\n", optarg);
if (strcmp(optarg, "name") == 0) {
query = NAME;
break;
}
if (strcmp(optarg, "symlink") == 0) {
query = SYMLINK;
break;
}
if (strcmp(optarg, "mode") == 0) {
query = MODE;
break;
}
if (strcmp(optarg, "owner") == 0) {
query = OWNER;
break;
}
if (strcmp(optarg, "group") == 0) {
query = GROUP;
break;
}
if (strcmp(optarg, "path") == 0) {
query = PATH;
break;
}
printf("unknown query type\n");
exit(1);
case 'r':
root = 1;
break;
case 'a':
attributes = 1;
break;
case 'd':
retval = udevdb_open_ro();
if (retval != 0) {
printf("unable to open udev database\n");
exit(2);
}
udevdb_call_foreach(print_record);
udevdb_exit();
exit(0);
case 'V':
printf("udev, version %s\n", UDEV_VERSION);
exit(0);
case 'h':
retval = 0;
case '?':
default:
goto help;
}
}
/* process options */
if (query != NONE) {
retval = udevdb_open_ro();
if (retval != 0) {
printf("unable to open udev database\n");
return -EACCES;
}
if (path[0] != '\0') {
/* remove sysfs_path if given */
if (strncmp(path, sysfs_path, strlen(sysfs_path)) == 0) {
pos = path + strlen(sysfs_path);
} else {
if (path[0] != '/') {
/* prepend '/' if missing */
strcat(temp, "/");
strncat(temp, path, sizeof(path));
pos = temp;
} else {
pos = path;
}
}
retval = udevdb_get_dev(pos, &dev);
if (retval != 0) {
printf("device not found in database\n");
goto exit;
}
goto print;
}
if (name[0] != '\0') {
/* remove udev_root if given */
if (strncmp(name, udev_root, strlen(udev_root)) == 0) {
pos = name + strlen(udev_root);
} else
pos = name;
retval = udevdb_get_dev_byname(pos, path, &dev);
if (retval != 0) {
printf("device not found in database\n");
goto exit;
}
goto print;
}
printf("query needs device path(-p) or node name(-n) specified\n");
goto exit;
print:
switch(query) {
case NAME:
if (root)
strfieldcpy(result, udev_root);
strncat(result, dev.name, sizeof(result));
break;
case SYMLINK:
strfieldcpy(result, dev.symlink);
break;
case MODE:
sprintf(result, "%#o", dev.mode);
break;
case GROUP:
strfieldcpy(result, dev.group);
break;
case OWNER:
strfieldcpy(result, dev.owner);
break;
case PATH:
strfieldcpy(result, path);
break;
default:
goto exit;
}
printf("%s\n", result);
exit:
udevdb_exit();
return retval;
}
if (attributes) {
if (path[0] == '\0') {
printf("attribute walk on device chain needs path(-p) specified\n");
return -EINVAL;
} else {
if (strncmp(path, sysfs_path, strlen(sysfs_path)) != 0) {
/* prepend sysfs mountpoint if not given */
strfieldcpy(temp, path);
strfieldcpy(path, sysfs_path);
strncat(path, temp, sizeof(path));
}
print_device_chain(path);
return 0;
}
}
if (root) {
printf("%s\n", udev_root);
return 0;
}
help:
printf("Usage: [-anpqrdVh]\n"
" -q TYPE query database for the specified value:\n"
" 'name' name of device node\n"
" 'symlink' pointing to node\n"
" 'mode' permissions of node\n"
" 'owner' of node\n"
" 'group' of node\n"
" 'path' sysfs device path\n"
" -p PATH sysfs device path used for query or chain\n"
" -n NAME node name used for query\n"
"\n"
" -r print udev root\n"
" -a print all attributes along the chain of the device\n"
" -d dump whole database\n"
" -V print udev version\n"
" -h print this help text\n"
"\n");
return retval;
}
int main(int argc, char *argv[], char *envp[])
{
int retval;
main_argv = argv;
main_argc = argc;
main_envp = envp;
/* initialize our configuration */
udev_init_config();
retval = process_options();
if (retval != 0)
exit(1);
exit(0);
}