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Date:      Sun, 21 Nov 2021 19:36:40 +0000
From:      bugzilla-noreply@freebsd.org
To:        toolchain@FreeBSD.org
Subject:   [Bug 259975] sys/file.h fails when -D_POSIX_C_SOURCE=200809L is given
Message-ID:  <bug-259975-29464-Wd2Uyb28vV@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-259975-29464@https.bugs.freebsd.org/bugzilla/>
References:  <bug-259975-29464@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D259975

--- Comment #2 from Warner Losh <imp@FreeBSD.org> ---
(In reply to Warner Losh from comment #1)

Also, the name u_int is only defined in sys/types.h, so this likely is
unrelated to the POSIX_C_SOURCE stuff and instead based on the expectation =
that
sys/files.h is independently includable.

But, u_int isn't visible when POSIX_C_SOURCE is defined (since it's hidden
behind __BSD_VISIBLE. It also uses kvaddr_t, ksize_t and maybe a few others
that should likely also be protected with __BSD_VISIBLE since POSIX_C_SOURCE
says define what's in posix and nothing else.

I'd wager the name-space-clean fix is to make xfile only __BSD_VISIBLE, but
that too would likely break vtk since it's already doing dubious things wit=
h it
and including files that aren't defined in the posix standard.

Most likely, though, it wants to use flock (also not defined in POSIX.1-200=
8),
which is the only function I could find in base man pages that mention
sys/file.h inclusion. However, if it wants this extension, shouldn't it not=
 be
defining that it doesn't want extensions?

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