Slackware- udev rules

PeterUK · 06-12-2013, 04:21 PM

I am creating a rule which do:

Code:

DRIVER=="usbtest", RUN+="/bin/sh -c 'echo -n %k> %S%p/driver/unbind'"

What does actually do?

dmesg give:

Code:

[38346.717705] usbtest 2-3:1.0: FX2 device
[38346.717709] usbtest 2-3:1.0: high-speed {control bulk-in bulk-out} tests (+alt)
[38346.717728] usbcore: registered new interface driver usbtest

What exactly is that? Thanks

UPDATE:
Also compiling the code I get this warning

Quote:

warning 197: keyword 'xdata' is deprecated, use '__xdata' instead

Why is that?

catkin · 07-09-2013, 01:25 AM

Answering because no answers for many days, not because I'm an expert ...

The rule means:

DRIVER==usbtest Apply this rule to all devices which the kernel chooses to use the usbtest driver for.
RUN+= Add the following command to commands to be run for this device (will be ineffective if there is a subsequent RUN=).
"/bin/sh -c '...'" Run /bin/sh, telling it to execute the command in single quotes.
echo -n %k> %S%p/driver/unbind Write the kernel name for this device to /sys/<path for this device>/driver/unbind. That explanation is based on the udev man page documentation of %* "substitutions" and may well not be exactly right. Maybe %S is /proc, not /sys.

The meaning of the first two lines of quoted dmesg depends on the usbtest driver itself. The third presumably means the usbtest driver has been added/loaded within the USB drivers framework.

What are you compiling?

bartgymnast · 07-09-2013, 01:46 AM

hi PeterUK, the Warning is a warning.
It basicaly means that you compile the code against another program that has released a newer version.
In this newer version they are using '__xdata' instead of 'xdata'

so the program you are compiling is basically written against an older version of the dependency.
and do not worry it is a warning, and not an error.

Richard Cranium · 07-09-2013, 04:09 AM

Quote:

Originally Posted by bartgymnast

hi PeterUK, the Warning is a warning.
It basicaly means that you compile the code against another program that has released a newer version.
In this newer version they are using '__xdata' instead of 'xdata'

so the program you are compiling is basically written against an older version of the dependency.
and do not worry it is a warning, and not an error.

Compilers emit warnings for errors that aren't so bad that the compiler cannot continue. You should fully understand what the warning means before you hand wave it away as a "no biggie."