linux-kernel - Re: [DISCUSS] Making system calls more portable.

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Message-ID: <45A0AE5C.6010801@gmail.com>
Date:	Sun, 07 Jan 2007 09:25:00 +0100
From:	Rene Herman <rene.herman@...il.com>
To:	Amit Choudhary <amit2030@...oo.com>
CC:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [DISCUSS] Making system calls more portable.

On 01/07/2007 09:15 AM, Amit Choudhary wrote:

> Well, system calls today are not portable mainly because they are
> invoked using a number and it may happen that a number 'N' may refer
> to systemcall_1() on one system/kernel and to systemcall_2() on
> another system/kernel.

If we're limited to Linux kernels, this seems to not be the case. Great 
care is taken in keeping this userspace ABI stable -- new system calls 
are given new numbers. Old system calls may disappear (after a long 
grace period) but even then I don't believe the number is ever recycled.

If your discussion is not limited to Linux kernels, then sure, but being 
portable at that (sub-libc) level is asking too much.

> I hope that I made some sense.

Some, but your supposition seems unclear.

Rene
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