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Alan Jenkins b29a5e4ab9 use more appropriate alternatives to malloc()
Use calloc to request cleared memory instead.
Kernel and libc conspire to make this more efficient.

Also, replace one malloc() + strcpy() with strdup().

Signed-off-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
2008-10-21 12:54:57 +02:00
docs/writing_udev_rules remove outdated docs/README-gcov_for_udev 2008-10-07 18:10:35 +02:00
extras use more appropriate alternatives to malloc() 2008-10-21 12:54:57 +02:00
rules replace spaces in dm and md name symlinks 2008-10-07 00:41:00 +02:00
test test: fix a few unintentially wrongly written rules which cause parse errors 2008-10-17 13:54:50 +02:00
udev use more appropriate alternatives to malloc() 2008-10-21 12:54:57 +02:00
.gitignore gitignore: move *.8 to subdirs 2008-09-29 05:03:43 +02:00
autogen.sh autogen.sh: add debug 2008-09-06 15:22:19 +02:00
ChangeLog release 130 2008-10-07 14:32:33 +02:00
configure.ac pass make distcheck 2008-10-18 20:33:06 +02:00
COPYING update source file headers 2006-08-28 00:29:11 +02:00
INSTALL update INSTALL 2008-08-28 22:58:03 +02:00
Makefile.am build: include Makefile.am.inc in all Makefile.am 2008-10-01 18:02:39 +02:00
Makefile.am.inc libudev: get rid of selinux 2008-10-02 18:48:40 +02:00
NEWS pass make distcheck 2008-10-18 20:33:06 +02:00
README libudev: monitor - add event properties to udev_device 2008-09-09 14:37:36 +02:00
TODO pass make distcheck 2008-10-18 20:33:06 +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