linux-kernel - Re: [PATCH 1/4] pidfd: support PIDFD_NONBLOCK in pidfd

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Date:   Tue, 1 Sep 2020 18:23:10 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     Christian Brauner <christian.brauner@...ntu.com>
Cc:     linux-kernel@...r.kernel.org,
        Christian Brauner <christian@...uner.io>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Kees Cook <keescook@...omium.org>,
        Sargun Dhillon <sargun@...gun.me>,
        Aleksa Sarai <cyphar@...har.com>,
        linux-kselftest@...r.kernel.org,
        Josh Triplett <josh@...htriplett.org>,
        Jens Axboe <axboe@...nel.dk>, linux-api@...r.kernel.org
Subject: Re: [PATCH 1/4] pidfd: support PIDFD_NONBLOCK in pidfd_open()

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 ?

Oleg.