Re: git: 61194e9852e6 - main - Add kqueue1() syscall

On Fri, Mar 31, 2023 at 01:27:54PM -0400, Ed Maste wrote:
> On Fri, 31 Mar 2023 at 12:38, Charlie Li <vishwin@freebsd.org> wrote:
> >
> > Konstantin Belousov wrote:
> > > The branch main has been updated by kib:
> > >
> > > URL: https://cgit.FreeBSD.org/src/commit/?id=61194e9852e641d1533cd04a5679d6042ff975d3
> > >
> > > commit 61194e9852e641d1533cd04a5679d6042ff975d3
> > > Author:     Konstantin Belousov <kib@FreeBSD.org>
> > > AuthorDate: 2023-03-25 23:39:02 +0000
> > > Commit:     Konstantin Belousov <kib@FreeBSD.org>
> > > CommitDate: 2023-03-27 23:39:26 +0000
> > >
> > >      Add kqueue1() syscall
> > >
> > >      It takes the flags argument.  Immediate use is to provide the KQUEUE_CLOEXEC
> > >      flag for kqueue(2).
> > >
> > This commit series causes x11/libinput to hit an assert (which also
> > silently crashes X on launch):
> > > Assertion failed: (libinput->refcount > 0), function libinput_unref, file ../src/libinput.c, line 1957.
> >
> > devel/libepoll-shim, x11/libinput's prime dependency, has its own
> > kqueue1() implementation, which is used when the system does not already
> > have one. Reverting this series and rebuilding devel/libepoll-shim to
> > use its included implementation allows x11/libinput to work again.
> 
> Ah, NetBSD added kqueue1 some time ago, and it uses the already
> existing flags (O_CLOEXEC etc.)
> If it's easy to test, can you try changing libepoll-shim to call
> kqueue1(KQUEUE_CLOEXEC)?
Overloading open(2) flags this way is not wise IMO.  Not to mention that
a lot of them do not make sense in kqueue(2) context, and that we might want
to add other flags which would put even more pressure on the limited O_*
bit set.

Please see https://reviews.freebsd.org/D39377
for my attempt to somewhat mitigate the mess.