Re: svn commit: r325294 - head/sys/dev/evdev

[Alexander Leidinger]

Quoting Vladimir Kondratyev <w...@freebsd.org> (from Wed, 1 Nov 2017 22:09:10 +0000 (UTC)):

Author: wulf
Date: Wed Nov  1 22:09:10 2017
New Revision: 325294
URL: https://svnweb.freebsd.org/changeset/base/325294

Log:
  evdev: Hide "kern.evdev.rcpt_mask" sysctl if kernel is compiled
  w/o EVDEV_SUPPORT as it's value has no meaning in this case.

  Now presence of this sysctl can be used for discovery if evdev support
  for hybrid devices is compiled into kernel or not.

    FEATURE(evdev, "evdev protocol support");



Bye,
Alexander.

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If you want to show the presence of a feature in the kernel: we have the FEATURE() macro for this. It's in sys/sysctl.h and you can use it like: You can then query it either via "sysctl kern.features.evdev" or via the "feature_present()" function in libc.

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