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#ifdef crud from the main code.
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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.
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> > here is a experimental symlink creation patch - for discussion,
> > in which direction we should go.
> > It is possible now to define SYMLINK= after the NAME= in udev.rules.
> > The link is relative to the node, but the path is not optimized now
> > if the node and the link are in the same nested directory.
> > Only one link is supported, cause i need to sleep now :)
> >
> > 06-simple-symlink-creation.diff
> > simple symlink creation
> > reorganized udev-remove to have access to the symlink field
> > subdir creation/removal are functions now
> > udev-test.pl tests for link creation/removal
Here is a new version with relative link target path optimization
an better tests in udev-test.pl:
LABEL, BUS="scsi", vendor="IBM-ESXS", NAME="1/2/a/b/node", SYMLINK="1/2/c/d/symlink"
Dec 7 06:48:34 pim udev[13789]: create_node: symlink 'udev-root/1/2/c/d/symlink' to node '1/2/a/b/node' requested
Dec 7 06:48:34 pim udev[13789]: create_path: created 'udev-root/1/2/c'
Dec 7 06:48:34 pim udev[13789]: create_path: created 'udev-root/1/2/c/d'
Dec 7 06:48:34 pim udev[13789]: create_node: symlink(../../a/b/node, udev-root/1/2/c/d/symlink)
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01-overall-whitespace+debug-text-conditioning.diff
o cleanup whitespace
o clarify a few comments
o enclose all printed debug string values in ''
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This only works if you are using glibc.
Patch based on patch from Marco d'Itri <md@Linux.IT>
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Forgot about umask in mknod...
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Will come in handy later...
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support subdirectory creation/removal for NAME="/devfs/is/crazy/video0"
create parent subdirs for device node if needed
remove subdirs when last node is removed
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set uid/gid of node specified in udev.permissions
only numeric id's are supported cause we can't resolve with
klibc or libc before real /etc is mounted
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OK, I fixed that bug you hinted at earlier in my previous
sleep_for_dev() patch. I am sure you fixed it, but here we go
nonetheless, just in case.
I actually changed it up a bit. It is probably faster to count down
from SECONDS_TO_WAIT_FOR_DEV than count up.
I also made the lone 'path' argument const, since it can be.
Some other misc. bits, too.
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namedev.c is still a mess, that's up next after testing...
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Another one of those "trivial patches so everything must be good"
sleep_for_dev() isn't exported or defined in a header, so it can be
marked 'static'
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Now we will timeout properly.
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config variables
This will make running tests a lot simpler.
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Now we standardise on a struct udevice to pass around, and store in the
database. This cleaned up the database code a lot.
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instead sleep for up to 10 seconds waiting for it to show up.
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Unix file modes should be stored in a mode_t, not a standard type. At
the moment it is actually unsigned, in fact, not a signed integer.
Attached patch does an s/int mode/mode_t mode/ and cleans up the
results.
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Yah yah, really trivial stuff...
- get_class_device() doesn't need to be exported; it
should be static
- white space cleanup
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database code still needs some major cleanup.
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Here's an "idea" of what I had in mind for udevdb. Let me preface the
code with a few remarks:
1) I was expecting to write this udevdb for udev to keep track of
devices. I was planning an external package that depends upon udev
to provide an external API to the udevdb database. The calls for the
interface would be read only access. Not sure how you want to do
packaging, if having a separate package is ok or having it included
in udev.
2) I created it as it is because udev isn't a daemon. So, the open
database call doesn't take any parameters. My plan was to create a
udevdb_init function that took arguments for initializing the db
to start, where you could specify in memory only or a file location.
This can all be filled in.
3) I hacked the Makefile to get it to work. Not sure how you'd want
that in the future.
4) This assumes TDB has been installed elsewhere, you would need to
edit your Makefile and point it to the header and library locations.
How do you want to do TDB in udev? Do you want to just reference it
and make udev dependent on that package being installed. Or should
we do what samba does and include a limited tdb version in udev?
5) Again, I hacked udev into your existing code. In the future, I'd
probably make a function around the filling out the udevice before
calling the store command. Didn't know if you wanted to change
your add device function to use struct udevice rather than having
everything separate.
6) Not sure what we should include in the udevice structure that's stored
by udev. I made a stab at a first shot - we can add and remove of course,
this was a first pass. I've come to realize - with you including libsysfs
in udev, the "external" interface that references udevdb could make
use of getting information from through libsysfs from sysfs and doesn't
need to be in udevdb.
7) I could write a namedevdb for namedev's device management if you
wanted.
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Patch from "Guo, Min" <min.guo@intel.com>
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2.6.0-test2-bk3 or so.
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