output from udevadm
in [Debian]
|
From: peasthope on 11 Jul 2010 17:30 The following short transcript is from adapting the udevadm invocation in http://wiki.debian.org/udev to investigate 1394 support in my Squeeze system. Two questions. * What exactly is meant by "device specified by the devpath" in the output? According to the udevadm man page, devpath is the value assigned to --path; but that parameter is not present in the command below. No devpath is specified. * What exactly is '/class/ieee1394_protocol/raw1394'? /class is not a directory in the filesystem and /dev/raw1394 is the only 1394 device I've found. Thanks for any ideas, ... Peter E. ======= transcript======= joule:/dev# udevadm info --name=/dev/raw1394 --attribute-walk Udevinfo 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 '/class/ieee1394_protocol/raw1394': KERNEL=="raw1394" SUBSYSTEM=="ieee1394_protocol" DRIVER=="" joule:/dev# ls /class ls: cannot access /class: No such file or directory joule:/dev# ======= transcript======= -- Carnot is down, waiting for installation of NetBSD. Personal site works; http://members.shaw.ca/peasthope/ . -- To UNSUBSCRIBE, email to debian-user-REQUEST(a)lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmaster(a)lists.debian.org Archive: http://lists.debian.org/171056555.58853.40157.(a)heaviside.invalid
From: Tom H on 12 Jul 2010 03:50 On Sun, Jul 11, 2010 at 5:23 PM, <peasthope(a)shaw.ca> wrote: > The following short transcript is from adapting the udevadm > invocation in http://wiki.debian.org/udev to investigate > 1394 support in my Squeeze system. Two questions. > > * What exactly is meant by "device specified by the devpath" in > the output? According to the udevadm man page, devpath is > the value assigned to --path; but that parameter is not present > in the command below. No devpath is specified. > > * What exactly is '/class/ieee1394_protocol/raw1394'? > /class is not a directory in the filesystem and /dev/raw1394 > is the only 1394 device I've found. > > ======= transcript======= > joule:/dev# udevadm info --name=/dev/raw1394 --attribute-walk > > Udevinfo 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 '/class/ieee1394_protocol/raw1394': > KERNEL=="raw1394" > SUBSYSTEM=="ieee1394_protocol" > DRIVER=="" > > joule:/dev# ls /class > ls: cannot access /class: No such file or directory > joule:/dev# >From a filesystem perspective, there is an assumed /sys "in front of" /class/... devpath is the /class/... equivalent of /dev/... You can get it with udevadm info --query=path --name=/dev/... -- To UNSUBSCRIBE, email to debian-user-REQUEST(a)lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmaster(a)lists.debian.org Archive: http://lists.debian.org/AANLkTim6J_AnNhnMphIowk1jVwkATG6OMgX8XlTKS4hx(a)mail.gmail.com
From: Camaleón on 12 Jul 2010 11:00 On Sun, 11 Jul 2010 14:23:37 -0700, peasthope wrote: > The following short transcript is from adapting the udevadm invocation > in http://wiki.debian.org/udev to investigate 1394 support in my Squeeze > system. Two questions. > > * What exactly is meant by "device specified by the devpath" in > the output? According to the udevadm man page, devpath is the value > assigned to --path; but that parameter is not present in the command > below. No devpath is specified. I think it refers to a possible value/option you can define using modifiers. As per "man udevinfo": *** --path=devpath The devpath of the device to query. *** Being udev a hierarchical database, I guess this option allows the user to define a "starting point" to make the query. > * What exactly is '/class/ieee1394_protocol/raw1394'? > /class is not a directory in the filesystem and /dev/raw1394 is the > only 1394 device I've found. Dunno what it is, but it seems to be located under "/sys/class/*" stt008:~# ls -l /sys/class total 0 drwxr-xr-x 2 root root 0 jul 12 07:43 backlight drwxr-xr-x 31 root root 0 jul 12 07:43 bdi drwxr-xr-x 5 root root 0 jul 12 07:43 bsg drwxr-xr-x 2 root root 0 jul 12 07:43 dma drwxr-xr-x 3 root root 0 jul 12 07:43 dmi drwxr-xr-x 4 root root 0 jul 12 07:43 graphics drwxr-xr-x 2 root root 0 jul 12 07:43 hwmon drwxr-xr-x 9 root root 0 jul 12 07:44 i2c-adapter drwxr-xr-x 3 root root 0 jul 12 07:43 ide_port drwxr-xr-x 2 root root 0 jul 12 07:43 ieee1394 drwxr-xr-x 4 root root 0 jul 12 07:43 ieee1394_host drwxr-xr-x 4 root root 0 jul 12 07:43 ieee1394_node drwxr-xr-x 2 root root 0 jul 12 07:43 ieee1394_protocol drwxr-xr-x 9 root root 0 jul 12 07:43 input drwxr-xr-x 11 root root 0 jul 12 07:43 mem drwxr-xr-x 9 root root 0 jul 12 07:43 misc drwxr-xr-x 5 root root 0 jul 12 07:43 net drwxr-xr-x 10 root root 0 jul 12 07:43 pci_bus drwxr-xr-x 2 root root 0 jul 12 07:43 power_supply drwxr-xr-x 3 root root 0 jul 12 07:43 ppdev drwxr-xr-x 3 root root 0 jul 12 07:43 printer drwxr-xr-x 3 root root 0 jul 12 07:43 rtc drwxr-xr-x 5 root root 0 jul 12 07:43 scsi_device drwxr-xr-x 4 root root 0 jul 12 07:43 scsi_disk drwxr-xr-x 5 root root 0 jul 12 07:43 scsi_generic drwxr-xr-x 8 root root 0 jul 12 07:43 scsi_host drwxr-xr-x 8 root root 0 jul 12 07:43 sound drwxr-xr-x 2 root root 0 jul 12 07:43 spi_master drwxr-xr-x 6 root root 0 jul 12 07:43 thermal drwxr-xr-x 73 root root 0 jul 12 07:43 tty drwxr-xr-x 10 root root 0 jul 12 07:43 usb_device drwxr-xr-x 18 root root 0 jul 12 07:43 usb_endpoint drwxr-xr-x 10 root root 0 jul 12 07:43 usb_host drwxr-xr-x 11 root root 0 jul 12 07:43 usbmon drwxr-xr-x 18 root root 0 jul 12 07:44 vc drwxr-xr-x 4 root root 0 jul 12 07:43 vtconsole Greetings, -- Camaleón -- To UNSUBSCRIBE, email to debian-user-REQUEST(a)lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmaster(a)lists.debian.org Archive: http://lists.debian.org/pan.2010.07.12.14.58.03(a)gmail.com
|
Pages: 1 Prev: basic installation question x 2 Next: lenny boot with grub2 |