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The systemd System and Service Manager
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Kay Sievers cdae488a3f remove "ignore_device"
There is no way to ignore an event these days. Libudev events can
not be suppressed. It only prevents RUN keys from being executed,
which results in an inconsistent behavior in current setups.
2009-11-16 15:22:17 +01:00
docs/writing_udev_rules doc: udevadm test *does* create nodes and links these days 2009-08-27 03:57:59 +02:00
extras modem-modeswitch: add a device 2009-11-12 22:17:47 +01:00
libudev udevd: queue-export - remove retry loop 2009-10-30 12:39:04 +01:00
m4 libudev: add gtk-doc 2009-06-15 13:22:21 +02:00
rules rules: set mode of floppy device nodes to 0660 2009-11-12 21:56:27 +01:00
test test: catch possible bug in GOTO resolving 2009-09-07 12:13:49 +02:00
udev remove "ignore_device" 2009-11-16 15:22:17 +01:00
.gitignore Merge libudev, udev, and the unconditional extras in a single Makefile.am. 2009-08-07 19:15:28 +02:00
autogen.sh cleanup ./configure installation directory options 2009-06-17 02:25:07 +02:00
ChangeLog release 147 2009-11-10 15:35:11 +01:00
configure.ac remove "ignore_device" 2009-11-16 15:22:17 +01:00
COPYING update source file headers 2006-08-28 00:29:11 +02:00
INSTALL INSTALL: use /sbin instead of %{sbindir} 2009-06-19 11:49:11 +02:00
Makefile.am Revert "gudev: fix out-of-tree build" 2009-11-10 15:09:27 +01:00
NEWS remove "ignore_device" 2009-11-16 15:22:17 +01:00
README require 2.6.27 for proper signalfd handling 2009-09-08 14:59:50 +02:00
TODO update TODO, NEWS 2009-09-16 20:27:30 +02:00
udev.conf udevadm: control - use getopt_long() 2008-09-03 21:56:47 +02:00

udev - userspace device management

Integrating udev in the system has complex dependencies and differs from distro
to distro. All major distros depend on udev these days and the system may not
work without a properly installed version. The upstream udev project does not
recommend to replace a distro's udev installation with the upstream version.

Tools and rules shipped by udev are not public API and may change at any time.
Never call any private tool in /lib/udev from any external application, it might
just go away in the next release. Access to udev information is only offered
by udevadm and libudev. Tools and rules in /lib/udev, and the entire content of
the /dev/.udev directory is private to udev and does change whenever needed.

Requirements:
  - Version 2.6.27 of the Linux kernel with sysfs, procfs, signalfd, inotify,
    unix domain sockets, networking and hotplug enabled:
      CONFIG_HOTPLUG=y
      CONFIG_UEVENT_HELPER_PATH=""
      CONFIG_NET=y
      CONFIG_UNIX=y
      CONFIG_SYSFS=y
      CONFIG_SYSFS_DEPRECATED*=n
      CONFIG_PROC_FS=y
      CONFIG_TMPFS=y
      CONFIG_INOTIFY_USER=y
      CONFIG_SIGNALFD=y
      CONFIG_TMPFS_POSIX_ACL=y (user ACLs for device nodes)
      CONFIG_BLK_DEV_BSG=y (SCSI devices)

  - For reliable operations, the kernel must not use the CONFIG_SYSFS_DEPRECATED*
    option.

  - Unix domain sockets (CONFIG_UNIX) as a loadable kernel module may work,
    but it is not supported.

  - The proc filesystem must be mounted on /proc, the sysfs filesystem must
    be mounted at /sys. No other locations are supported by udev.

  - The system must have the following group names resolvable at udev startup:
      disk, cdrom, floppy, tape, audio, video, lp, tty, dialout, kmem.
    Especially in LDAP setups, it is required, that getgrnam() is able to resolve
    these group names with only the rootfs mounted, and while no network is
    available.

  - To build all udev extras, libacl, libglib2, libusb, usbutils, pciutils,
    gperf are needed. These dependencies can be disabled with the
    --disable-extras option.

Operation:
  Udev creates and removes device nodes in /dev, based on events the kernel
  sends out on device discovery or removal.

  - Early in the boot process, the /dev directory should get a 'tmpfs'
    filesystem mounted, which is maintained by udev. Created nodes or changed
    permissions will not survive a reboot, which is intentional.

  - The content of /lib/udev/devices directory which contains the nodes,
    symlinks and directories, which are always expected to be in /dev, should
    be copied over to the tmpfs mounted /dev, to provide the required nodes
    to initialize udev and continue booting.

  - The deprecated hotplug helper /sbin/hotplug should be disabled in the
    kernel configuration, it is not needed today, and may render the system
    unusable because the kernel may create too many processes in parallel
    so that the system runs out-of-memory.

  - All kernel events are matched against a set of specified rules in
    /lib/udev/rules.d which make it possible to hook into the event
    processing to load required kernel modules and setup devices. For all
    devices the kernel exports a major/minor number, udev will create a
    device node with the default kernel name, or the one specified by a
    matching udev rule.

Please direct any comment/question to the linux-hotplug mailing list at:
  linux-hotplug@vger.kernel.org