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[PATCH] udev - program to query all device attributes to build a rule

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On Sun, Jan 18, 2004 at 07:30:50AM +0100, Kay Sievers wrote:
> Hi,
> here is a small program to query all attributes of a device and
> print these in the udev key format. It may help to get the keys to
> define a rule.

Fixed a typo - the sysfs_device is right now.

USB FLash Reader:
    kay@pim:~/src/udev.kay$ extras/udevinfo/udevinfo /sys/block/sda/sda1

    device '/sys/block/sda/sda1' has major:minor 8:1

    looking at class device '/sys/block/sda/sda1':
      SYSFS_dev="8:1"
      SYSFS_start="32"
      SYSFS_size="160"
      SYSFS_stat="       0        0        0        0"

    follow class device's "device" link '/sys/block/sda':
      BUS="scsi"
      ID="57:0:0:0"
      SYSFS_detach_state="0"
      SYSFS_type="0"
      SYSFS_device_blocked="0"
      SYSFS_queue_depth="1"
      SYSFS_scsi_level="3"
      SYSFS_vendor="SMSC    "
      SYSFS_model="USB 2 HS-CF"
      SYSFS_rev="1.25"
      SYSFS_online="1"
This commit is contained in:
kay.sievers@vrfy.org 2004-01-19 19:46:26 -08:00 committed by Greg KH
parent 765cbd9759
commit be9b51f663
2 changed files with 146 additions and 0 deletions
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14
extras/udevinfo/Makefile Normal file
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@ -0,0 +1,14 @@
PROG=udevinfo
LD=$(CC)
OBJS=udevinfo.o
all: $(PROG)
clean:
rm -f $(PROG) $(OBJS)
$(PROG): $(OBJS)
$(LD) $(LDFLAGS) -o $(PROG) $(CRT0) $(OBJS) $(SYSFS)
me:
cd ../..; make EXTRAS=extras/udevinfo

132
extras/udevinfo/udevinfo.c Normal file
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@ -0,0 +1,132 @@
/*
* udevinfo - fetches attributes for a device
*
* Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
*
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation version 2 of the License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include "libsysfs.h"
# define VALUE_SIZE 200
char **main_argv;
char **main_envp;
static int print_all_attributes(char *path)
{
struct dlist *attributes;
struct sysfs_attribute *attr;
struct sysfs_directory *sysfs_dir;
char value[VALUE_SIZE];
int len;
int retval = 0;
sysfs_dir = sysfs_open_directory(path);
if (sysfs_dir == NULL)
return -1;
attributes = sysfs_get_dir_attributes(sysfs_dir);
if (attributes == NULL) {
retval = -1;
goto exit;
}
dlist_for_each_data(attributes, attr, struct sysfs_attribute) {
if (attr->value != NULL) {
strncpy(value, attr->value, VALUE_SIZE);
len = strlen(value);
if (value[len-1] == '\n')
value[len-1] = '\0';
printf(" SYSFS_%s=\"%s\"\n", attr->name, value);
}
}
printf("\n");
exit:
sysfs_close_directory(sysfs_dir);
return retval;
}
int main(int argc, char **argv, char **envp)
{
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_device;
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) {
printf("couldn't get the class device\n");
return -1;
}
/* read the 'dev' file for major/minor*/
attr = sysfs_get_classdev_attr(class_dev, "dev");
if (attr == NULL) {
printf("couldn't get the \"dev\" file\n");
retval = -1;
goto exit;
}
printf("\ndevice '%s' has major:minor %s\n", class_dev->path, attr->value);
sysfs_close_attribute(attr);
/* open sysfs class device directory and print all attributes */
printf("looking at class device '%s':\n", class_dev->path);
if (print_all_attributes(class_dev->path) != 0) {
printf("couldn't open class device directory\n");
retval = -1;
goto exit;
}
/* get the device (if parent exists use it instead) */
class_dev_parent = sysfs_get_classdev_parent(class_dev);
if (class_dev_parent != NULL) {
//sysfs_close_class_device(class_dev);
class_dev = class_dev_parent;
}
sysfs_device = sysfs_get_classdev_device(class_dev);
if (sysfs_device != NULL) {
printf("follow class device's \"device\" link '%s':\n", class_dev->path);
printf(" BUS=\"%s\"\n", sysfs_device->bus);
printf(" ID=\"%s\"\n", sysfs_device->bus_id);
/* open sysfs device directory and print all attributes */
print_all_attributes(sysfs_device->path);
sysfs_close_device(sysfs_device);
}
exit:
//sysfs_close_class_device(class_dev);
return retval;
}