05-16-2019
No, that's not the issue: xinput test 6 definitely outputs to stdout. Proof is that xinput test 6 6>/dev/null produces output, but xinput test 6 1>/dev/null produces no output.
As I tried to explain, 6 in the command is an argument to xinput that tells it the input device I'm interested in testing. It is not a file descriptor.
Last edited by DevuanFan; 05-16-2019 at 12:31 PM..
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xinput(1) General Commands Manual xinput(1)
NAME
xinput - utility to configure and test XInput devices
SYNOPSIS
xinput [version] [list [device_name]] [set-pointer device_name] [get-feedbacks device_name] [set-mode device_name ABSOLUTE|RELATIVE] [set-
ptr-feedback device_name threshold num denom] [set-integer-feedback device_name index value] [set-button-map device_name map button 1 [map
button 2 [...]]] [query-state device_name] [test [-proximity] device_name]
DESCRIPTION
xinput version
test if the XInput extension is available and return the version number of the program.
xinput list [device_name]
If no argument is given list all the input devices showing all their features. If an argument is given, show all the feature of
device_name. Uses XListInputDevices(3).
xinput get-feedbacks device_name
Display the feedbacks of device_name. Uses XGetFeedbackControl(3).
xinput set-pointer device_name
Switch device_name in core pointer. Uses XChangePointerDevice(3).
xinput set-mode device_name ABSOLUTE|RELATIVE
Change the mode of device_name. Uses XSetDeviceMode(3).
xinput set-ptr-feedback device_name threshold num denom
Change the acceleration of device_name. Uses XChangeFeedbackControl(3).
xinput set-integer-feedback device_name index value
Change the value of an integer feedback of device_name. Uses XChangeFeedbackControl(3).
xinput set-button-map device_name map button 1 [map button 2 [...]]
Change the button mapping of device_name. Uses XSetDeviceButtonMapping(3).
xinput query-state device_name
Query the device state. Uses XQueryDeviceState(3).
xinput list-props device_name [device_name...]
Lists properties that can be set for the given device(s).
xinput set-int-prop device_name property format value
Sets an integer property for the device. Appropriate values for format are 8, 16, or 32, depending on the property.
xinput watch-props device_name
Prints to standard out when property changes occur.
xinput delete-prop device_name property
Delete the property from the device.
xinput test [-proximity] device_name
Register all extended events from device_name and enter an endless loop displaying events received. If the -proximity is given,
ProximityIn and ProximityOut are registered.
device_name can be the device name as a string or the XID of the device.
property can be the property as a string or the Atom value.
COPYRIGHT
Copyright 1996,1997, Frederic Lepied.
Copyright 2008, Philip Langdale.
AUTHOR
Philip Langdale, <philipl@alumni.utexas.net>
Frederic Lepied, France <Frederic.Lepied@sugix.frmug.org>
Patches, bug reports, and suggestions are welcome.
Frederic Lepied $Date: 1997/06/09 16:06:31 $ xinput(1)