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You are here: Misc

Gentoo udev Guide


1. What is udev?


The /dev Directory


When Linux-users talk about the hardware on their system in the vicinity of people who believe Linux is some sort of virus or brand of coffee, the use of "slash dev slash foo" will return a strange look for sure. But for the fortunate user (and that includes you) using /dev/hda1 is just a fast way of explaining that we are talking about the primary master IDE, first partition. Or aren't we?
We all know what a device file is. Some even know why device files have special numbers when we take a closer look at them when we issue ls -l in /dev. But what we always take for granted is that the primary master IDE disk is referred to as /dev/hda. You might not see it this way, but this is a flaw by design.
Think about hotpluggable devices like USB, IEEE1394, hot-swappable PCI, ... What is the first device? And for how long? What will the other devices be named when the first one disappears? How will that affect ongoing transactions? Wouldn't it be fun that a printing job is suddenly moved from your supernew laserprinter to your almost-dead matrix printer because your mom decided to pull the plug of the laserprinter which happened to be the first printer?


Enter udev. The goals of the udev project are both interesting and needed:
- Runs in userspace
- Dynamically creates/removes device files
- Provides consistent naming
- Provides a user-space API
To provide these features, udev is developed in three separate projects: namedev, libsysfs and, of course, udev.

namedev


Namedev allows you to define the device naming separately from the udev program. This allows for flexible naming policies and naming schemes developed by separate entities. This device naming subsystem provides a standard interface that udev can use.
Currently only a single naming scheme is provided by namedev; the one provided by LANANA, used by the majority of Linux systems currently and therefore very suitable for the majority of Linux users.
Namedev uses a 5-step procedure to find out the name of a given device. If the device name is found in one of the given steps, that name is used. The steps are:
- label or serial number
- bus device number
- bus topology
- statically given name
- kernel provided name

The label or serial number step checks if the device has a unique identifier. For instance USB devices have a unique USB serial number; SCSI devices have a unique UUID. If namedev finds a match between this unique number and a given configuration file, the name provided in the configuration file is used.
The bus device number step checks the device bus number. For non-hot-swappable environments this procedure is sufficient to identify a hardware device. For instance PCI bus numbers rarely change in the lifetime of a system. Again, if namedev finds a match between this position and a given configuration file, the name provided in that configuration file is used.
Likewise the bus topology is a rather static way of defining devices as long as the user doesn't switch devices. When the position of the device matches a given setting provided by the user, the accompanying name is used.
The fourth step, statically given name, is a simple string replacement. When the kernel name (the default name) matches a given replacement string, the substitute name will be used.
The final step (kernel provided name) is a catch-all: this one takes the default name provided by the kernel. In the majority of cases this is sufficient as it matches the device naming used on current Linux systems.

libsysfs


udev interacts with the kernel through the sysfs pseudo filesystem. The libsysfs project provides a common API to access the information given by the sysfs filesystem in a generic way. This allows for querying all kinds of hardware without having to make assumptions on the kind of hardware.

udev


Every time the kernel notices an update in the device structure, it calls the /sbin/hotplug program. Hotplug runs the applications linked in the /etc/hotplug.d/default directory where you will also find a symlink to the udev application. Hotplug directs the information given by the kernel to the udev application which performs the necessary actions on the /dev structure (creating or deleting device files).

2. Using udev on Gentoo


Requirements


udev is meant to be used in combination with a 2.6 kernel (like development-sources or gentoo-dev-sources). If you're using such a kernel then you just have to make sure that you have a recent sys-apps/baselayout version. That's all you need.
Code Listing 2.1: Installing udev
# emerge udev

udev will install hotplug-base as one of it's dependencies. You do not need to install hotplug unless you want your modules automatically loaded when you plug devices in. hotplug also handles the automated bringup of network devices and firmware downloading.
Code Listing 2.2: Installing optional hotplug scripts
# emerge hotplug

If you want modules loaded for devices that have been plugged in before you boot, use the coldplug package:
Code Listing 2.3: Installing the coldplug package
# emerge coldplug

Kernelwise, if you're using the default set by genkernel then you're all set. Otherwise be sure to activate the following options:
Code Listing 2.4: Required kernel options
General setup --->   
[*] Support for hot-pluggable devices

File systems --->
Pseudo filesystems --->
[*] /proc file system support
[*] Virtual memory file system support (former shm fs)

You can leave the /dev file system support (OBSOLETE) active if you wish but you have to make sure that "Automatically mount at boot" is disabled:
Code Listing 2.5: Don't automatically mount devfsd
File systems --->   
Pseudo Filesystems --->
[*] /dev file system support (OBSOLETE)
[ ] Automatically mount at boot

Configuration


If you want to use the udev-tweaks Gentoo added to make your life comfortable, then read no more. Gentoo will use udev but keep a static /dev so that you will never have any missing device nodes. The Gentoo init scripts won't run the devfsd daemon and will deactivate devfs when you boot up.

But if you are a die-hard and want to run a udev-only, no-tweaked system as is intended by the udev development (including the difficulties of missing device nodes because udev doesn't support them yet), by all means, read on :)

We'll deactivate the rules that save the device file nodes: edit the RC_DEVICE_TARBALL variable in /etc/conf.d/rc and set it to no:
Code Listing 2.6: /etc/conf.d/rc
RC_DEVICE_TARBALL="no"

If you have included devfs support in your kernel, you can deactivate it in the bootloader configuration: add gentoo=nodevfs as a kernel parameter. If you want to use devfs and deactivate udev, add gentoo=noudev as kernel parameter.

3. Known Issues


Missing device node files at boot


If you can't boot successfully because you get an error about /dev/null not found, or because the initial console is missing, the problem is that you lack some device files that must be available before /dev is mounted and handled by udev. This is common on Gentoo machines installed from old media.

If you run sys-apps/baselayout-1.8.12 or later, this problem is alleviated since the boot process should still manage to complete. However, to get rid of those annoying warnings, you should create the missing device nodes as described below.

To see which devices nodes are present before the /dev filesystem is mounted, run the following commands:
Code Listing 3.1: Listing device nodes available at boot
# mkdir test   
# mount --bind / test
# cd test/dev
# ls

The devices needed for a successful boot are /dev/null and /dev/console. If they didn't show up in the previous test, you have to create them manually. Issue the following commands in the test/dev/ directory:
Code Listing 3.2: Creating necessary device node files
# mknod -m 660 console c 5 1   
# mknod -m 660 null c 1 3

When you're finished, don't forget to unmount the test/ directory:
Code Listing 3.3: Unmounting the test/ directory
# cd ../..   
# umount test
# rmdir test

udev and nvidia


If you use the proprietary driver from nVidia and the X server fails to start on a udev-only system, then make sure you have:

the nvidia module listed in /etc/modules.autoload.d/kernel-2.6
a version of nvidia-kernel equal to or greater than media-video/nvidia-kernel-1.0.5336-r2
a version of baselayout equal to or greater than sys-apps/baselayout-1.8.12

LVM2 Names Disappear


When you use udev and LVM2 together, you might notice that your created volume groups and logical volumes have disappeared. Well, they haven't, but they are unfortunately named /dev/dm-# with # being 0, 1, ...

To fix this, edit /etc/udev/rules.d/50-udev.rules and uncomment the following line:
Code Listing 3.4: Uncomment this line from /etc/udev/rules.d/50-udev.rules
KERNEL="dm-[0-9]*",     PROGRAM="/sbin/devmap_name %M %m", NAME="%k", SYMLINK="%c"

No Consistent Naming between DevFS and udev


Even though our intention is to have a consistent naming scheme between both dynamical device management solutions, sometimes naming differences do occur. One reported clash is with a HP Smart Array 5i RAID controller (more precisely the cciss kernel module). With udev, the devices are named /dev/cciss/cXdYpZ with X, Y and Z regular numbers. With devfs, the devices are /dev/hostX/targetY/partZ or symlinked from /dev/cciss/cXdY.

If this is the case, don't forget to update your /etc/fstab and bootloader configuration files accordingly.

Other issues


If device nodes are not created when a module is loaded from /etc/modules.autoload.d/kernel-2.6 but they appear when you load the module manually with modprobe then you should try upgrading to sys-apps/baselayout-1.8.12 or later.

Support for the framebuffer devices (/dev/fb/*) comes with the kernel starting from version 2.6.6-rc2.

For kernels older than 2.6.4 you have to explicitly include support for the /dev/pts filesystem.
Code Listing 3.5: Enabling the /dev/pts filesystem
File systems --->   
Pseudo filesystems --->
[*] /dev/pts file system for Unix98 PTYs

4. Resources & Acknowledgements


The udev talk on the Linux Symposium (Ottawa, Ontario Canada - 2003) given by Greg Kroah-Hartman (IBM Corporation) provided a solid understanding on the udev application.

Decibel's UDEV Primer is an in-depth document about udev and Gentoo.

Writing udev rules by fellow Gentoo developer Daniel Drake is an excellent document to learn how to customize your udev installation.
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Description

Framework for notifying the user of an event

Added to portage

2022-08-14

knotifyconfig - 5.97.0
Ebuild name:

kde-frameworks/knotifyconfig-5.97.0

Description

Framework for configuring desktop notifications

Added to portage

2022-08-14

kpackage - 5.97.0
Ebuild name:

kde-frameworks/kpackage-5.97.0

Description

Framework to install and load packages of non binary content

Added to portage

2022-08-14

kparts - 5.97.0
Ebuild name:

kde-frameworks/kparts-5.97.0

Description

Framework providing elaborate user-interface components

Added to portage

2022-08-14

kpeople - 5.97.0
Ebuild name:

kde-frameworks/kpeople-5.97.0

Description

KDE contact person abstraction library

Added to portage

2022-08-14

kplotting - 5.97.0
Ebuild name:

kde-frameworks/kplotting-5.97.0

Description

Framework providing easy data-plotting functions

Added to portage

2022-08-14

kpty - 5.97.0
Ebuild name:

kde-frameworks/kpty-5.97.0

Description

Framework for pseudo terminal devices and running child processes

Added to portage

2022-08-14

kquickcharts - 5.97.0
Ebuild name:

kde-frameworks/kquickcharts-5.97.0

Description

QtQuick plugin providing high-performance charts

Added to portage

2022-08-14

kross - 5.97.0
Ebuild name:

kde-frameworks/kross-5.97.0

Description

Framework for embedding scripting into applications

Added to portage

2022-08-14

krunner - 5.97.0
Ebuild name:

kde-frameworks/krunner-5.97.0

Description

Framework for providing different actions given a string query

Added to portage

2022-08-14

kservice - 5.97.0
Ebuild name:

kde-frameworks/kservice-5.97.0

Description

Advanced plugin and service introspection

Added to portage

2022-08-14

ktexteditor - 5.97.0
Ebuild name:

kde-frameworks/ktexteditor-5.97.0

Description

Framework providing a full text editor component

Added to portage

2022-08-14

ktextwidgets - 5.97.0
Ebuild name:

kde-frameworks/ktextwidgets-5.97.0

Description

Framework providing an assortment of widgets for displaying and

Added to portage

2022-08-14

kunitconversion - 5.97.0
Ebuild name:

kde-frameworks/kunitconversion-5.97.0

Description

Framework for converting units

Added to portage

2022-08-14

kwallet - 5.97.0
Ebuild name:

kde-frameworks/kwallet-5.97.0

Description

Framework providing desktop-wide storage for passwords

Added to portage

2022-08-14

kwayland - 5.97.0
Ebuild name:

kde-frameworks/kwayland-5.97.0

Description

Qt-style client and server library wrapper for Wayland libraries

Added to portage

2022-08-14

kwidgetsaddons - 5.97.0
Ebuild name:

kde-frameworks/kwidgetsaddons-5.97.0

Description

An assortment of high-level widgets for common tasks

Added to portage

2022-08-14

kwindowsystem - 5.97.0
Ebuild name:

kde-frameworks/kwindowsystem-5.97.0

Description

Framework providing access to properties and features of the wi

Added to portage

2022-08-14

kxmlgui - 5.97.0
Ebuild name:

kde-frameworks/kxmlgui-5.97.0

Description

Framework for managing menu and toolbar actions in an abstract way

Added to portage

2022-08-14

libmilter - 1.0.2_p2-r1
Ebuild name:

mail-filter/libmilter-1.0.2_p2-r1

Description

The Sendmail Filter API (Milter)

Added to portage

2022-08-14

libmilter - 1.0.2_p3-r2
Ebuild name:

mail-filter/libmilter-1.0.2_p3-r2

Description

Added to portage

2022-08-14

libnfs - 5.0.2
Ebuild name:

net-fs/libnfs-5.0.2

Description

Client library for accessing NFS shares over a network

Added to portage

2022-08-14

mdurl - 0.1.2
Ebuild name:

dev-python/mdurl-0.1.2

Description

Markdown URL utilities

Added to portage

2022-08-14

mkdocs-material - 8.4.0
Ebuild name:

dev-python/mkdocs-material-8.4.0

Description

A Material Design theme for MkDocs

Added to portage

2022-08-14

modemmanager-qt - 5.97.0
Ebuild name:

kde-frameworks/modemmanager-qt-5.97.0

Description

ModemManager bindings for Qt

Added to portage

2022-08-14

networkmanager-qt - 5.97.0
Ebuild name:

kde-frameworks/networkmanager-qt-5.97.0

Description

NetworkManager bindings for Qt

Added to portage

2022-08-14

nototools - 0.2.17
Ebuild name:

dev-python/nototools-0.2.17

Description

Noto fonts support tools and scripts plus web site generation

Added to portage

2022-08-14

numpy - 1.23.2
Ebuild name:

dev-python/numpy-1.23.2

Description

Fast array and numerical python library

Added to portage

2022-08-14

opencascade - 7.6.3
Ebuild name:

sci-libs/opencascade-7.6.3

Description

Development platform for CAD/CAE, 3D surface/solid modeling and data exc

Added to portage

2022-08-14

oxygen-icons - 5.97.0
Ebuild name:

kde-frameworks/oxygen-icons-5.97.0

Description

Oxygen SVG icon theme

Added to portage

2022-08-14

papirus-icon-theme - 20220808
Ebuild name:

x11-themes/papirus-icon-theme-20220808

Description

Free and open source SVG icon theme

Added to portage

2022-08-14

plasma - 5.97.0
Ebuild name:

kde-frameworks/plasma-5.97.0

Description

Plasma framework

Added to portage

2022-08-14

prison - 5.97.0
Ebuild name:

kde-frameworks/prison-5.97.0

Description

QRCode and data matrix barcode library

Added to portage

2022-08-14

purpose - 5.97.0
Ebuild name:

kde-frameworks/purpose-5.97.0

Description

Library for providing abstractions to get the developer's purposes fu

Added to portage

2022-08-14

qqc2-desktop-style - 5.97.0
Ebuild name:

kde-frameworks/qqc2-desktop-style-5.97.0

Description

Style for QtQuickControls 2 that uses QWidget's QStyle for

Added to portage

2022-08-14

rack-test - 2.0.2
Ebuild name:

dev-ruby/rack-test-2.0.2

Description

Rack is a small, simple testing API for Rack apps

Added to portage

2022-08-14

rr - 5.6.0
Ebuild name:

dev-util/rr-5.6.0

Description

Record and Replay Framework

Added to portage

2022-08-14

secretstorage - 3.3.3
Ebuild name:

dev-python/secretstorage-3.3.3

Description

Python bindings to FreeDesktop.org Secret Service API

Added to portage

2022-08-14

setuptools-rust - 1.5.1
Ebuild name:

dev-python/setuptools-rust-1.5.1

Description

A plugin for setuptools to build Rust Python extensions

Added to portage

2022-08-14

solid - 5.97.0
Ebuild name:

kde-frameworks/solid-5.97.0

Description

Provider for platform independent hardware discovery, abstraction and m

Added to portage

2022-08-14

sonnet - 5.97.0
Ebuild name:

kde-frameworks/sonnet-5.97.0

Description

Framework for providing spell-checking through abstraction of popular

Added to portage

2022-08-14

sshfs - 3.7.3
Ebuild name:

net-fs/sshfs-3.7.3

Description

Fuse-filesystem utilizing the sftp service

Added to portage

2022-08-14

stack_data - 0.4.0
Ebuild name:

dev-python/stack_data-0.4.0

Description

Extract data from Python tracebacks for informative displays

Added to portage

2022-08-14

syndication - 5.97.0
Ebuild name:

kde-frameworks/syndication-5.97.0

Description

Library for parsing RSS and Atom feeds

Added to portage

2022-08-14

syntax-highlighting - 5.97.0
Ebuild name:

kde-frameworks/syntax-highlighting-5.97.0

Description

Framework for syntax highlighting

Added to portage

2022-08-14

sysklogd - 2.4.4
Ebuild name:

app-admin/sysklogd-2.4.4

Description

Standard log daemons

Added to portage

2022-08-14

telegram-desktop-bin - 4.1.0
Ebuild name:

net-im/telegram-desktop-bin-4.1.0

Description

Official desktop client for Telegram (binary package)

Added to portage

2022-08-14

threadweaver - 5.97.0
Ebuild name:

kde-frameworks/threadweaver-5.97.0

Description

Framework for managing threads using job and queue-based interfa

Added to portage

2022-08-14

tor - 0.4.7.10
Ebuild name:

net-vpn/tor-0.4.7.10

Description

Anonymizing overlay network for TCP

Added to portage

2022-08-14

urxvt-tabbedex - 22.32
Ebuild name:

x11-misc/urxvt-tabbedex-22.32

Description

An extended version of rxvt-unicode's tabbed perl extension

Added to portage

2022-08-14

virtualbox - 6.1.36-r1
Ebuild name:

app-emulation/virtualbox-6.1.36-r1

Description

Family of powerful x86 virtualization products for enterprise an

Added to portage

2022-08-14

wine-staging - 7.15
Ebuild name:

app-emulation/wine-staging-7.15

Description

Free implementation of Windows(tm) on Unix, with Wine-Staging patch

Added to portage

2022-08-14

wine-vanilla - 7.15
Ebuild name:

app-emulation/wine-vanilla-7.15

Description

Free implementation of Windows(tm) on Unix, without external patchs

Added to portage

2022-08-14

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