[Bug 239604] FIONREAD ioctl returns the wrong result on a master pty after the slave has been closed

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=239604

--- Comment #2 from commit-hook@FreeBSD.org ---
A commit in branch stable/13 references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=984128ce2d5eb7d3374dd4b245d443ec2f5d96b2

commit 984128ce2d5eb7d3374dd4b245d443ec2f5d96b2
Author:     Kyle Evans <kevans@FreeBSD.org>
AuthorDate: 2024-01-16 02:55:59 +0000
Commit:     Kyle Evans <kevans@FreeBSD.org>
CommitDate: 2024-01-30 17:11:10 +0000

    kern: pts: do not special case closed slave side

    This would previously return 1 if the slave side of the pts was closed
    to force an application to read() from it and observe the EOF, but it's
    not clear why and this is inconsistent both with how we handle devices
    with similar mechanics (like pipes) and also with other kernels, such as
    OpenBSD/NetBSD and Linux.

    PR:             239604
    Reviewed by:    kib

    (cherry picked from commit 30189156d325fbcc9d1997d791daedc9fa3bed20)

 sys/kern/tty_pts.c             |  7 +----
 tests/sys/kern/Makefile        |  3 ++
 tests/sys/kern/tty_pts.c (new) | 64 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 68 insertions(+), 6 deletions(-)

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