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We can not predict the major/minor of non-existing devices:
$ grep . /sys/class/block/sd*/dev
/sys/class/block/sda1/dev:259:524288
/sys/class/block/sda2/dev:259:262144
/sys/class/block/sda3/dev:259:786432
/sys/class/block/sda4/dev:259:131072
/sys/class/block/sda/dev:259:0
/sys/class/block/sdb/dev:259:655360
/sys/class/block/sdc/dev:259:393216
If this functionality is still needed for some broken hardware, it needs to be
solved with a tool not part of the udev package. Because such option is unreliable
and unsafe to use.
There is no way to ignore an event these days. Libudev events can
not be suppressed. It only prevents RUN keys from being executed,
which results in an inconsistent behavior in current setups.
Its use breaks too many things which expect to be run from independent
later rules, and is an idication that something needs to be fixed
properly instead.
If by-path / by-id links don't quite do what you want, this is a nice
clean way to extend the behaviour. Real example:
SYMLINK=="serial/by-id/usb-Novatel_Wireless_Inc*CDMA*-if00-port0", \\
SYMLINK+="cellcard"
Some users ask how to do things like this.
- create an additional link with a shorter name
- create a link which matches more loosely
(omit certain path segments e.g. serial numbers)
- change permissions on certain USB device nodes
Allow them to realize this without reading the friendly *.c files.
Signed-off-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
Dates aren't shown in the manpages. So they are not really useful,
and no-one is going to remember to update them.
"<refmiscinfo class="version"></refmiscinfo>" sounds even less useful.
I leave the unused "title" and "productname" tags. They could
theoretically be useful, and aren't hard to maintain. We just need to
fix the "title" for udevadm.
Signed-off-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
It did not work for the last couple of releases.
If RUN{record_failed}+="..." is given, a non-zero execution will mark
the event as failed. Recorded failed events can be re-triggered with:
udevadm trigger --type=failed
The failed tracking _might_ be useful for things which might not be
ready to be executed at early bootup, but a bit later when the needed
dependencies are available. In many cases though, it indicates that
something is used in a way it should not.
This allows you to re-process the rules if the content of the device
has been changed, most useful for block subsystem to cause vol_id to
be run again.
The in-memory rule array of a common desktop distro install took:
1151088 bytes
with the token list:
109232 bytes tokens (6827 * 16 bytes), 71302 bytes buffer
