From: Oleg Nesterov <oleg@redhat.com>
To: Christian Brauner <christian.brauner@ubuntu.com>
Cc: linux-kernel@vger.kernel.org,
Christian Brauner <christian@brauner.io>,
"Peter Zijlstra (Intel)" <peterz@infradead.org>,
Ingo Molnar <mingo@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
"Eric W. Biederman" <ebiederm@xmission.com>,
Kees Cook <keescook@chromium.org>,
Sargun Dhillon <sargun@sargun.me>,
Aleksa Sarai <cyphar@cyphar.com>,
linux-kselftest@vger.kernel.org,
Josh Triplett <josh@joshtriplett.org>,
Jens Axboe <axboe@kernel.dk>,
linux-api@vger.kernel.org
Subject: Re: [PATCH 1/4] pidfd: support PIDFD_NONBLOCK in pidfd_open()
Date: Tue, 1 Sep 2020 18:53:16 +0200 [thread overview]
Message-ID: <20200901165315.GD4386@redhat.com> (raw)
In-Reply-To: <20200901163308.mwd334y462fmml6s@wittgenstein>
On 09/01, Christian Brauner wrote:
>
> On Tue, Sep 01, 2020 at 06:23:10PM +0200, Oleg Nesterov wrote:
> > On 08/31, Christian Brauner wrote:
> > >
> > > --- /dev/null
> > > +++ b/include/uapi/linux/pidfd.h
> > > @@ -0,0 +1,12 @@
> > > +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
> > > +
> > > +#ifndef _UAPI_LINUX_PIDFD_H
> > > +#define _UAPI_LINUX_PIDFD_H
> > > +
> > > +#include <linux/types.h>
> > > +#include <linux/fcntl.h>
> > > +
> > > +/* Flags for pidfd_open(). */
> > > +#define PIDFD_NONBLOCK O_NONBLOCK
> > > +
> > > +#endif /* _UAPI_LINUX_PIDFD_H */
> >
> > Why? Can't we simply use O_NONBLOCK ?
>
> It's the same thing we seem to do for any other (anon inode) fds:
>
> include/linux/eventfd.h:#define EFD_NONBLOCK O_NONBLOCK
> include/uapi/linux/inotify.h:#define IN_NONBLOCK O_NONBLOCK
> include/uapi/linux/signalfd.h:#define SFD_NONBLOCK O_NONBLOCK
> include/uapi/linux/timerfd.h:#define TFD_NONBLOCK O_NONBLOCK
>
> also for O_CLOEXEC:
>
> include/linux/eventfd.h:#define EFD_CLOEXEC O_CLOEXEC
> include/linux/userfaultfd_k.h:#define UFFD_CLOEXEC O_CLOEXEC
> include/uapi/linux/eventpoll.h:#define EPOLL_CLOEXEC O_CLOEXEC
> include/uapi/linux/mount.h:#define OPEN_TREE_CLOEXEC O_CLOEXEC
> include/uapi/linux/perf_event.h:#define PERF_FLAG_FD_CLOEXEC (1UL << 3) /* O_CLOEXEC */
> include/uapi/linux/signalfd.h:#define SFD_CLOEXEC O_CLOEXEC
> include/uapi/linux/timerfd.h:#define TFD_CLOEXEC O_CLOEXEC
>
> So I think we should just do the same.
Hmm, OK, then I have to agree.
> A clean flag namespace seems
> nicer to me too tbh.
Disagree but this doesn't matter ;)
Oleg.
next prev parent reply other threads:[~2020-09-01 16:53 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-31 13:45 [PATCH 0/4] Support non-blocking pidfds Christian Brauner
2020-08-31 13:45 ` [PATCH 1/4] pidfd: support PIDFD_NONBLOCK in pidfd_open() Christian Brauner
2020-09-01 16:23 ` Oleg Nesterov
2020-09-01 16:33 ` Christian Brauner
2020-09-01 16:53 ` Oleg Nesterov [this message]
2020-08-31 13:45 ` [PATCH 2/4] exit: support non-blocking pidfds Christian Brauner
2020-09-01 16:11 ` Oleg Nesterov
2020-09-01 16:18 ` Christian Brauner
2020-08-31 13:45 ` [PATCH 3/4] tests: port pidfd_wait to kselftest harness Christian Brauner
2020-08-31 13:45 ` [PATCH 4/4] tests: add waitid() tests for non-blocking pidfds Christian Brauner
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