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Date:   Tue, 3 Mar 2020 02:04:59 +1100
From:   Aleksa Sarai <cyphar@cyphar.com>
To:     David Howells <dhowells@redhat.com>
Cc:     Florian Weimer <fweimer@redhat.com>,
        Christian Brauner <christian.brauner@ubuntu.com>,
        linux-api@vger.kernel.org, viro@zeniv.linux.org.uk,
        metze@samba.org, torvalds@linux-foundation.org,
        linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: Have RESOLVE_* flags superseded AT_* flags for new syscalls?
Message-ID: <20200302150459.zu3eo5so66vrji4w@yavin>
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On 2020-03-02, David Howells <dhowells@redhat.com> wrote:
> Florian Weimer <fweimer@redhat.com> wrote:
>=20
> > Regarding open flags, I think the key point for future APIs is to avoid
> > using the set of flags for both control of the operation itself
> > (O_NOFOLLOW/AT_SYMLINK_NOFOLLOW, O_NOCTTY) and properaties of the
> > resulting descriptor (O_RDWR, O_SYNC).  I expect that doing that would
> > help code that has to re-create an equivalent descriptor.  The operation
> > flags are largely irrelevant to that if you can get the descriptor by
> > other means.
>=20
> It would also be nice to sort out the problem with O_CLOEXEC.  That can h=
ave a
> different value, depending on the arch - so it excludes at least three bi=
ts
> from the O_* flag set.

Not to mention there are (at least?) three or four different values for
_CLOEXEC for different syscalls...

--=20
Aleksa Sarai
Senior Software Engineer (Containers)
SUSE Linux GmbH
<https://www.cyphar.com/>

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