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The systemd System and Service Manager
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Kay Sievers ee173c5927 replace spaces in dm and md name symlinks
We create multiple symlinks for dm names with spaces, which
isn't what we want.
2008-10-07 00:41:00 +02:00
docs docs: update some docs and delete outdated stuff 2008-06-26 18:12:50 +02:00
extras volume_id: more fat debugging 2008-10-06 18:17:05 +02:00
rules replace spaces in dm and md name symlinks 2008-10-07 00:41:00 +02:00
test test: replace last reference of "/class/*" devpath 2008-09-29 05:18:23 +02:00
udev replace spaces in dm and md name symlinks 2008-10-07 00:41:00 +02:00
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ChangeLog release 129 2008-10-01 20:42:53 +02:00
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TODO libudev: fix --enable-debug 2008-10-05 16:18:21 +02:00
udev.conf udevadm: control - use getopt_long() 2008-09-03 21:56:47 +02:00

udev - userspace device management

For more information see the files in the docs/ directory.

Important Note:
  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.

Requirements:
  - Version 2.6.19 of the Linux kernel for reliable operation of this release of
    udev. The kernel may have a requirement on udev too, see Documentation/Changes
    in the kernel source tree for the actual dependency.

  - The kernel must have sysfs, unix domain sockets and networking enabled.
    (unix domain sockets (CONFIG_UNIX) as a loadable kernel module may work,
    but it does not make any sense - don't complain if anything goes wrong.)

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


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

  - Very early in the boot process, the /dev/ directory should get a 'tmpfs'
    filesystem mounted, which is populated from scratch 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 old hotplug helper /sbin/hotplug should be disabled on bootup, before
    actions like loading kernel modules are taken, which may cause a lot of
    events.

  - The udevd daemon must be started on bootup to receive netlink uevents
    from the kernel driver core.

  - 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/concern to the linux-hotplug mailing list at:
  linux-hotplug@vger.kernel.org