linux-kernel - Re: [PATCH] nsfs: add NS_GET_INIT

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Message-ID: <CAKgNAkjMmLmZPk08tK=mBjTqPF7X771Of79WD-YYXhN9cB2ULw@mail.gmail.com>
Date:   Thu, 18 Jun 2020 11:03:25 +0200
From:   "Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>
To:     Christian Brauner <christian.brauner@...ntu.com>
Cc:     "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Wolfgang Bumiller <w.bumiller@...xmox.com>,
        Serge Hallyn <serge@...lyn.com>,
        Alexander Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH] nsfs: add NS_GET_INIT_PID ioctl

On Thu, 18 Jun 2020 at 10:45, Christian Brauner
<christian.brauner@...ntu.com> wrote:
>
> Add an ioctl() to return the PID of the init process/child reaper of a pid
> namespace as seen in the caller's pid namespace.

What are the pros and cons of returning a PID FD instead of a PID?

Thanks,

Michael