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david@fubar.dk 5aebfbcb62 [PATCH] D-BUS patch for udev-008
Attached is a patch against udev-008 to send out a D-BUS message when a
device node is added or removed.

Using D-BUS lingo, udev acquires the org.kernel.udev service and sends
out a NodeCreated or NodeDeleted signal on the
org.kernel.udev.NodeMonitor interface. Each signal carries two
parameters: the node in question and the corresponding sysfs path.

[Note: the D-BUS concepts of service, interface, object can be a bit
confusing at first glance]

An example program listening for these messages looks like this

#!/usr/bin/python

import dbus
import gtk

def udev_signal_received(dbus_iface, member, service, object_path, message):
    [filename, sysfs_path] = message.get_args_list()
    if member=='NodeCreated':
        print 'Node %s created for %s'%(filename, sysfs_path)
    elif member=='NodeDeleted':
        print 'Node %s deleted for %s'%(filename, sysfs_path)

def main():
    bus = dbus.Bus(dbus.Bus.TYPE_SYSTEM)
    bus.add_signal_receiver(udev_signal_received,
                            'org.kernel.udev.NodeMonitor',  # interface
                            'org.kernel.udev',              # service
                            '/org/kernel/udev/NodeMonitor') # object

    gtk.mainloop()

if __name__ == '__main__':
    main()

and this is the output when hot-plugging some usb-storage.

[david@laptop udev-008]$ ~/node_monitor.py
Node /udev/sda created for /block/sda
Node /udev/sda1 created for /block/sda/sda1
Node /udev/sda1 deleted for /block/sda/sda1
Node /udev/sda deleted for /block/sda

The patch requires D-BUS 0.20 or later while the python example program
requires D-BUS from CVS as I only recently applied a patch against the
python bindings.
2005-04-26 21:13:06 -07:00
docs [PATCH] updated the documentation. 2005-04-26 21:01:38 -07:00
etc/init.d [PATCH] fix udev init.d script to handle all class devices in sysfs. 2005-04-26 21:13:02 -07:00
extras [PATCH] update udev extras/scsi_id to version 0.2 2005-04-26 21:13:06 -07:00
klibc [PATCH] sync up with the 0.84 version of klibc 2005-04-26 21:13:02 -07:00
libsysfs [PATCH] fix up some duplicated function compiler warnings in libsysfs 2005-04-26 21:13:05 -07:00
tdb [PATCH] fix some compiler warnings in the tdb code. 2005-04-26 21:13:05 -07:00
test [PATCH] experimental (very simple) SYMLINK creation 2005-04-26 21:13:06 -07:00
COPYING [PATCH] added initial documentation and gpl license 2005-04-26 21:00:32 -07:00
ChangeLog [PATCH] update ChangeLog for v008 2005-04-26 21:13:06 -07:00
FAQ [PATCH] Add FAQ for udev 2005-04-26 21:01:41 -07:00
Makefile [PATCH] D-BUS patch for udev-008 2005-04-26 21:13:06 -07:00
README [PATCH] 005 release 2005-04-26 21:06:22 -07:00
TODO [PATCH] D-BUS patch for udev-008 2005-04-26 21:13:06 -07:00
klibc_fixups.c [PATCH] get rid of functions in klibc_fixups that are now in klibc 2005-04-26 21:13:02 -07:00
klibc_fixups.h [PATCH] get rid of functions in klibc_fixups that are now in klibc 2005-04-26 21:13:02 -07:00
list.h [PATCH] Initial namedev parsing of config files 2005-04-26 21:01:38 -07:00
logging.c [PATCH] overall whitespace + debug text conditioning 2005-04-26 21:13:03 -07:00
namedev.c [PATCH] experimental (very simple) SYMLINK creation 2005-04-26 21:13:06 -07:00
namedev.h [PATCH] experimental (very simple) SYMLINK creation 2005-04-26 21:13:06 -07:00
namedev_parse.c [PATCH] experimental (very simple) SYMLINK creation 2005-04-26 21:13:06 -07:00
udev-add.c [PATCH] D-BUS patch for udev-008 2005-04-26 21:13:06 -07:00
udev-remove.c [PATCH] D-BUS patch for udev-008 2005-04-26 21:13:06 -07:00
udev.8 [PATCH] man page beauty 2005-04-26 21:13:06 -07:00
udev.c [PATCH] D-BUS patch for udev-008 2005-04-26 21:13:06 -07:00
udev.conf [PATCH] add support for a main udev config file, udev.conf. 2005-04-26 21:13:05 -07:00
udev.h [PATCH] D-BUS patch for udev-008 2005-04-26 21:13:06 -07:00
udev.permissions [PATCH] added debian's version of udev.permissions. 2005-04-26 21:06:25 -07:00
udev.permissions.debian [PATCH] added debian's version of udev.permissions. 2005-04-26 21:06:25 -07:00
udev.rules [PATCH] pattern match for label method 2005-04-26 21:13:06 -07:00
udev.rules.demo [PATCH] add support for a main udev config file, udev.conf. 2005-04-26 21:13:05 -07:00
udev.spec [PATCH] 008_bk mark 2005-04-26 21:13:06 -07:00
udev_config.c [PATCH] get rid of the majority of the debug environment variables. 2005-04-26 21:13:05 -07:00
udev_sysbus_policy.conf [PATCH] D-BUS patch for udev-008 2005-04-26 21:13:06 -07:00
udevdb.c [PATCH] overall whitespace + debug text conditioning 2005-04-26 21:13:03 -07:00
udevdb.h [PATCH] overall whitespace + debug text conditioning 2005-04-26 21:13:03 -07:00

README

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

- 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