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udev - a userspace implementation of devfs
For more information on the design, and structure of this project, see the
files in the docs/ directory.
To use:
- You must be running a 2.6 version of the Linux kernel.
- Make sure sysfs is mounted. udev will figure out where sysfs is mounted, but
the traditional place for it is at /sys. You can mount it by hand by running:
mount -t sysfs none /sys
- Make sure you have the latest version of the linux-hotplug scripts. They are
available at linux-hotplug.sf.net or from your local kernel.org mirror at:
kernel.org/pub/linux/utils/kernel/hotplug/
They are required in order for udev to work properly.
If for some reason you do not install the hotplug scripts, you must tell the
kernel to point the hotplug binary at wherever you install udev at. This can
be done by:
echo "/sbin/udev" > /proc/sys/kernel/hotplug
- Build the project:
make
Note:
There are a number of different flags that you can use when building
udev. They are as follows:
prefix - set this to the default root that you want udev to be
installed into. This works just like the 'configure --prefix'
script does. Default value is ''. Only override this if you
really know what you are doing.
KLIBC - if set to 'true', udev is built and linked against the included
version of klibc. Default value is 'false'.
DEBUG - if set to 'true', debugging messages will be sent to the syslog
as udev is run. Default value is 'false'.
DBUS - if set to 'true', DBUS messages will be sent everytime udev
creates or removes a device node. This requires that DBUS
development headers and libraries be present on your system to
build properly. Default value is 'false'.
So, if you want to build udev using klibc with debugging messages, you
would do:
make KLIBC=true DEBUG=true
- Install the project:
make install
This will put the udev binary in /sbin, create the /udev and /etc/udev
directories, and place the udev configuration files in /etc/udev. You
will probably want to edit the namedev.* files to create custom naming
rules. More info on how the config files are set up are contained in
comments in the files, and is located in the documentation.
- Add and remove devices from the system and marvel as nodes are created
and removed in /udev/ based on the device types.
- If you later get sick of it, uninstall it:
make uninstall
Things are still quite rough, and it's a bit beyond proof of concept
code. Help is very much appreciated, see the TODO file for a list of
things left to be done.
If you want to build using klibc, use the Makefile.klibc file:
- read the klibc/klibc/README file for how to set up the linux
symlink properly.
- make clean
- make -f Makefile.klibc
and marvel at the tiny binary you just created :)
Any comment/questions/concerns please let me know.
greg k-h
greg@kroah.com
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