This scheme is more consistent and makes it obvious if a match happens
against the event device only, or the full chain of parent devices.
The old key names are now:
BUS -> SUBSYSTEMS
ID -> KERNELS
SYSFS -> ATTRS
DRIVER -> DRIVERS
Match keys for the event device:
KERNEL
SUBSYSTEM
ATTR
DRIVER (in a future release, for now the same as DRIVERS)
Match keys for all devices along the parent device chain:
KERNELS
SUBSYSTEMS
ATTRS
DRIVERS
ID, BUS, SYSFS are no longer mentioned in the man page but still work.
DRIVER must be converted to DRIVERS to match the new scheme. For now,
an error is logged, if DRIVER is used. In a future release, the DRIVER
key behaviour will change.
If we don't have any interesting values to store, we just use
a symlink (doesn't occupy a whole page on tmpfs like a file)
to store the name of the node belonging to a devpath. This will
allow udevinfo to resolve all names, even when we don't have a
full database entry.
We never used any of the libsysfs convenience features. Here we replace
it completely with 300 lines of code, which are much simpler and a bit
faster cause udev(d) does not open any syfs file for a simple event which
does not need any parent device information.
Signed-off-by: Kay Sievers <kay.sievers@suse.de>
All udev state is kept in /$udev_root/.udev/ now. No option to
configure that anymore, it will always be there.
Signed-off-by: Kay Sievers <kay.sievers@suse.de>
HAL soon wants to read the whole content of the udevdatabase while
starting up. This makes the whole udev structure available to the
udevinfo "dump".
Signed-off-by: Kay Sievers <kay.sievers@suse.de>
strlcpy counts the sourec string lengt and is therefore not suitable
to copy a defined length of characters from one string to another.
Signed-off-by: Kay Sievers <kay.sievers@suse.de>
Device nodes created with the default rule, without any symlink or option
are no longer saved to the udevdb. This saves us ~3 MB RAM for pretty much
useless files on tmpfs.
Note: HAL needs a fix to handle this correctly. It's already available on
the list.
Signed-off-by: Kay Sievers <kay.sievers@suse.de>
Any program can query with udevinfo for persistent device
attributes evaluated on device discovery now.
Signed-off-by: Kay Sievers <kay.sievers@suse.de>
udevinfo segfaults cause klibc's strlcpy writes behind the specified
size of the destination string. strlcat truncates the destination
string which is also not what you expect from a concatenation function.
Some broken ide drivers are generating high event traffic, with
add/remove events. With this attribute, it can be specified,
that the node is always available. It may be used in conjunction
with the new DRIVER= match to catch specific kernel device drivers.
