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authordavid@fubar.dk <david@fubar.dk>2003-12-08 09:19:19 -0800
committerGreg KH <gregkh@suse.de>2005-04-26 21:13:06 -0700
commit5aebfbcb62614fc2bf2b1579d62e3fe272c6751a (patch)
treeafe2093652343ee02e95880d25cf3b3e48779c74 /TODO
parent3d150dfb28efbaf0b25f154fb8955c47d606c3d5 (diff)
[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.
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diff --git a/TODO b/TODO
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+++ b/TODO
@@ -21,7 +21,6 @@ greg@kroah.com
will have an upgrade path.
- do early boot logic (putting udev into initramfs, handle pivot-root,
etc.)
-- add hooks to call D-BUS when new node is created or removed
- lots of other stuff...
- actually use the BUS= value to determine where the LABEL rule should look
(right now it's ignored, and we only look in the current sysfs directory.)