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

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"

diff --git a/extras/udevinfo/Makefile b/extras/udevinfo/Makefile
new file mode 100644 (file)
index 0000000..f31c8c1
--- /dev/null
+++ b/extras/udevinfo/Makefile
@@ -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

diff --git a/extras/udevinfo/udevinfo.c b/extras/udevinfo/udevinfo.c
new file mode 100644 (file)
index 0000000..4f229cd
--- /dev/null
+++ b/extras/udevinfo/udevinfo.c
@@ -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;
+}