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null: support EVFILT_READ/EVFILT_WRITE kevent filters

Description

null: support EVFILT_READ/EVFILT_WRITE kevent filters

This enhances the full, null, and zero devices to support read and write kevent filters.

A read event is immediately triggered for full and null, and never for zero.
A write event is immediately triggered for zero and null, and never for full.

Reviewed by: cognet
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D51807

(cherry picked from commit b89104dfd5cf001b34963b9e02083027f9d215d5)

Details

Provenance
gahrAuthored on Aug 7 2025, 8:24 PM
Reviewer
cognet
Differential Revision
D51807: null: support EVFILT_READ/EVFILT_WRITE kevent filters
Parents
rG8b26c76a6d41: Updates for ccosh[f] and csinh[f]
Branches
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