|USBHIDACTION(1)||General Commands Manual||USBHIDACTION(1)|
usbhidactioncan be used to execute commands when certain values appear on HID controls. The normal operation for this program is to read the configuration file and then become a daemon and execute commands as the HID items specify. If a read from the HID device fails the program dies; this will make it die when the USB device is unplugged.
The options are as follows:
The config file will be re-read if the process gets a HUP signal.
Each line has three parts: a name of a USB HID item, a value for that item, and an action. There must be whitespace between the parts.
The item names are similar to those used by usbhidctl(1), but each part must be prefixed by its page name.
The value is simply a numeric value. When the item reports this value the action will be performed. If the value is `*' it will match any value.
The action is a normal command that is executed by using fork(2). Before it is executed some substitution will occur: `$n' will be replaced by the nth argument on the command line, `$V' will be replaced by the numeric value of the HID item, `$N' will be replaced by the name of the control, and `$H' will be replaced by the name of the HID device.
# The volume range is 0..255. Moving 8 volume steps each keypress # moves quickly through the volume range but still has decent # granularity. Consumer:Volume_Up 1 mixerctl -f $1 outputs.master=+8 Consumer:Volume_Down 1 mixerctl -f $1 outputs.master=-8 Consumer:Mute 1 mixerctl -f $1 outputs.master.mute=toggle
A sample invocation using this configuration would be
$ usbhidaction -f /dev/uhid1 -c conf /dev/mixer0
usbhidactioncommand first appeared in OpenBSD 3.2.
|March 7, 2011||OpenBSD-5.1|