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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.
30 lines
1.3 KiB
Plaintext
30 lines
1.3 KiB
Plaintext
This is a short list of things that needs to be done. They are in no specific
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order. I will gladly accept patches for any of these items, or any other stuff
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people offer up.
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greg k-h
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greg@kroah.com
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- fix kernel name logic to handle devices like sdaj and such.
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- more documentation (can never have too much.)
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- add symlink generation and removal support
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- better partition support (it's a hack right now, maybe new libsysfs changes
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can help out a lot here.)
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- allow database to be queried by other programs
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- split program into two pieces (daemon and helper that sends events to it).
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This will allow us to keep track of sequences, and lots of other needed
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stuff.
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- keep track of current permissions on devices when daemon shuts down.
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- better permission handling
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- create kernel name to devfs name config file so that all of the devfs users
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will have an upgrade path.
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- do early boot logic (putting udev into initramfs, handle pivot-root,
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etc.)
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- lots of other stuff...
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- actually use the BUS= value to determine where the LABEL rule should look
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(right now it's ignored, and we only look in the current sysfs directory.)
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This is needed, for example, to look at the usb device's serial number of a
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usb-storage device, instead of the scsi device's sysfs directory for the
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serial number.
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