linux-kernel - Re: Official Linux system wrapper library?

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Message-ID: <alpine.DEB.2.21.1811141735070.16571@digraph.polyomino.org.uk>
Date:   Wed, 14 Nov 2018 17:40:18 +0000
From:   Joseph Myers <joseph@...esourcery.com>
To:     Andy Lutomirski <luto@...capital.net>
CC:     Szabolcs Nagy <Szabolcs.Nagy@....com>,
        Dave P Martin <Dave.Martin@....com>,
        Daniel Colascione <dancol@...gle.com>, nd <nd@....com>,
        Florian Weimer <fweimer@...hat.com>,
        "Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Joel Fernandes <joelaf@...gle.com>,
        Linux API <linux-api@...r.kernel.org>,
        Willy Tarreau <w@....eu>, Vlastimil Babka <vbabka@...e.cz>,
        Carlos O'Donell <carlos@...hat.com>,
        "libc-alpha@...rceware.org" <libc-alpha@...rceware.org>
Subject: Re: Official Linux system wrapper library?

On Wed, 14 Nov 2018, Andy Lutomirski wrote:

> I’m not so sure it’s useless. Historically, POSIX systems have, in 
> practice and almost by definition, been very C focused, but the world is 
> changing. A less crufty library could be useful for newer languages:

Historically, there was once an attempt to rework POSIX into a separate 
language-independent definition and language bindings (for C, Fortran, Ada 
etc.), but I don't think it got anywhere, and it's probably doubtful 
whether the idea was ever very practical.  (See the introduction to 
POSIX.1:1990, for example: "Future revisions are expected to contain 
bindings for other programming languages as well as for the C language.  
This will be accomplished by breaking this part of ISO/IEC 9945 into 
multiple portions---one defining core requirements independent of any 
programming language, and others composed of programming language 
bindings.".)

> > thread internals for syscalls that
> > require coordination between all user created
> > threads (setxid),
> 
> We should just deal with this in the kernel. The current state of 
> affairs is nuts.

Yes, we should have a few new syscalls to set these ids at the process 
level.

-- 
Joseph S. Myers
joseph@...esourcery.com