最終更新:2022-03-03 (木) 18:26:51 (784d)  

udevadm info
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Query sysfs or the udev database.

例 

  • udevadm info -q all -n /dev/input/event0
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パス

  • --name=, --path=, or absolute path in /dev/ or /sys expected.
  • Linux/sysがルートになるっぽい
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デバイスパスから元のデバイスを取得

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Linux/USBドライブ

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help 

  • udevadm info [OPTIONS] [DEVPATH|FILE]
Query sysfs or the udev database.
  -h --help                   Print this message
     --version                Print version of the program
  -q --query=TYPE             Query device information:
       name                     Name of device node
       symlink                  Pointing to node
       path                     sysfs device path
       property                 The device properties
       all                      All values
  -p --path=SYSPATH           sysfs device path used for query or attribute walk
  -n --name=NAME              Node or symlink name used for query or attribute walk
  -r --root                   Prepend dev directory to path names
  -a --attribute-walk         Print all key matches walking along the chain
                              of parent devices
  -d --device-id-of-file=FILE Print major:minor of device containing this file
  -x --export                 Export key/value pairs
  -P --export-prefix          Export the key name with a prefix
  -e --export-db              Export the content of the udev database
  -c --cleanup-db             Clean up the udev database
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例 

  • $ udevadm info -q all -n /dev/input/event0
P: /devices/LNXSYSTM:00/LNXPWRBN:00/input/input0/event0
N: input/event0
E: DEVNAME=/dev/input/event0
E: DEVPATH=/devices/LNXSYSTM:00/LNXPWRBN:00/input/input0/event0
E: ID_INPUT=1
E: ID_INPUT_KEY=1
E: ID_PATH=acpi-LNXPWRBN:00
E: ID_PATH_TAG=acpi-LNXPWRBN_00
E: MAJOR=13
E: MINOR=64
E: SUBSYSTEM=input
E: TAGS=:power-switch:
E: USEC_INITIALIZED=8821
E: XKBLAYOUT=jp
E: XKBMODEL=pc105
  • # udevadm info -a -n /dev/input/event5

Udevadm info starts with the device specified by the devpath and then
walks up the chain of parent devices. It prints for every device
found, all possible attributes in the udev rules key format.
A rule to match, can be composed by the attributes of the device
and the attributes from one single parent device.

  looking at device '/devices/pci0000:00/0000:00:04.0/input/input6/event5':
    KERNEL=="event5"
    SUBSYSTEM=="input"
    DRIVER==""

  looking at parent device '/devices/pci0000:00/0000:00:04.0/input/input6':
    KERNELS=="input6"
    SUBSYSTEMS=="input"
    DRIVERS==""
    ATTRS{name}=="VirtualBox mouse integration"
    ATTRS{phys}==""
    ATTRS{uniq}==""
    ATTRS{properties}=="0"

  looking at parent device '/devices/pci0000:00/0000:00:04.0':
    KERNELS=="0000:00:04.0"
    SUBSYSTEMS=="pci"
    DRIVERS=="vboxguest"
    ATTRS{irq}=="20"
    ATTRS{subsystem_vendor}=="0x0000"
    ATTRS{broken_parity_status}=="0"
    ATTRS{class}=="0x088000"
    ATTRS{consistent_dma_mask_bits}=="32"
    ATTRS{dma_mask_bits}=="32"
    ATTRS{local_cpus}=="00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000001"
    ATTRS{device}=="0xcafe"
    ATTRS{enable}=="1"
    ATTRS{msi_bus}==""
    ATTRS{local_cpulist}=="0"
    ATTRS{vendor}=="0x80ee"
    ATTRS{subsystem_device}=="0x0000"
    ATTRS{numa_node}=="-1"
    ATTRS{d3cold_allowed}=="0"

  looking at parent device '/devices/pci0000:00':
    KERNELS=="pci0000:00"
    SUBSYSTEMS==""
    DRIVERS==""
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man 

  •    udevadm info options
       Queries the udev database for device information stored in the udev database. It can also query the properties of a device from its
       sysfs representation to help creating udev rules that match this device.

       --query=type
           Query the database for specified type of device data. It needs the --path or --name to identify the specified device. Valid queries
           are: name, symlink, path, property, all.

       --path=devpath
           The devpath of the device to query.

       --name=file
           The name of the device node or a symlink to query

       --root
           The udev root directory: /dev. If used in conjunction with a name or symlink query, the query returns the absolute path including
           the root directory.

       --run
           The udev runtime directory: /run/udev.

       --attribute-walk
           Print all sysfs properties of the specified device that can be used in udev rules to match the specified device. It prints all
           devices along the chain, up to the root of sysfs that can be used in udev rules.

       --export
           Print output as key/value pairs. Values are enclosed in single quotes.

       --export-prefix=name
           Add a prefix to the key name of exported values.

       --device-id-of-file=file
           Print major/minor numbers of the underlying device, where the file lives on.

       --export-db
           Export the content of the udev database.

       --cleanup-db
           Cleanup the udev database.

       --version
           Print version.

       --help
           Print help text.
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