ATTR{key}
Specify a value to be written to a sysfs attribute of the event device. If the ==
operator is used, this key is also used to match against the value of a sysfs at-
tribute.
ENV{key}
Tell udev to export a variable to the environment. If the == operator is used, this
key is also used to match against an environment variable.
RUN
Tell udev to add a program to the list of programs to be executed for this device.
Keep in mind to restrict this to very short tasks to avoid blocking further events
for this device.
LABEL
Add a label where a GOTO can jump to.
GOTO
Tell udev to skip a number of rules and continue with the one that carries the label
referenced by the GOTO key.
IMPORT{type}
Load variables into the event environment such as the output of an external program.
udev imports variables of several different types. If no type is specied, udev
tries to determine the type itself based on the executable bit of the le permissions.
•
program tells udev to execute an external program and import its output.
•
file tells udev to import a text le.
•
parent tells udev to import the stored keys from the parent device.
WAIT_FOR_SYSFS
Tells udev to wait for the specied sysfs le to be created for a certain device.
For example, WAIT_FOR_SYSFS="ioerr_cnt" informs udev to wait until
the ioerr_cnt le has been created.
OPTIONS
The OPTION key may have several possible values:
Dynamic Kernel Device Management with udev 217
