linux-kernel - Re: RFC: Serial port DTR/RTS

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Message-ID: <2846db90-fb05-41d2-b8de-c678af75a04b@zytor.com>
Date: Sat, 15 Nov 2025 16:47:37 -0800
From: "H. Peter Anvin" <hpa@...or.com>
To: Ned Ulbricht <nedu@...scape.net>, "Maciej W. Rozycki" <macro@...am.me.uk>
Cc: Greg KH <gregkh@...uxfoundation.org>, "Theodore Ts'o" <tytso@....edu>,
        Maarten Brock <Maarten.Brock@...ls.nl>,
        "linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
        "linux-api@...r.kernel.org" <linux-api@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: RFC: Serial port DTR/RTS - O_<something>

On 2025-11-15 13:29, Ned Ulbricht wrote:
> |
> | O_TTY_INIT
> 
> https://pubs.opengroup.org/onlinepubs/9799919799/
> 
> That's what motivates my first-glance preference to name this new flag,
> which will have approximately opposite behavior, as O_TTY_NOINIT.
> 
> But as a generic abstraction, I more prefer O_KEEP.
> 

O_KEEP seems a little vague, but O_KEEPCONFIG seems like a decent name.

It seems like we don't have several new flags:

	O_EXEC
	O_SEARCH
	O_CLOFORK
	O_TTY_INIT
	O_RSYNC
	O_NOCLOBBER

Some of them *may* be possible to construct with existing Linux options, I'm
not 100% sure; in particular O_SEARCH might be the same as (O_DIRECTORY|O_PATH).

O_NOCLOBBER looks like an odd in-between between O_EXCL and
(O_EXCL|O_NOFOLLOW); stated to be specifically to implement the shell
"noclobber" semantic.

	-hpa