Date: Fri, 8 Jan 1999 07:40:01 -0800 (PST) From: Doug Rabson <dfr@nlsystems.com> To: freebsd-bugs@FreeBSD.ORG Subject: Re: kern/9359: implement support for adding syscalls in KLD modules Message-ID: <199901081540.HAA07938@freefall.freebsd.org>
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The following reply was made to PR kern/9359; it has been noted by GNATS.
From: Doug Rabson <dfr@nlsystems.com>
To: Assar Westerlund <assar@sics.se>
Cc: FreeBSD-gnats-submit@freebsd.org
Subject: Re: kern/9359: implement support for adding syscalls in KLD
modules
Date: Fri, 8 Jan 1999 15:35:43 +0000 (GMT)
On 8 Jan 1999, Assar Westerlund wrote:
> Doug Rabson <dfr@nlsystems.com> writes:
> > Thanks for this - I'll try and get it committed in the next day or two.
>
> Great.
>
> > I thought about the syscall number problem too and my best idea was
> > to extend the struct module_stat with a type specific field which
> > the syscall module handler could use to report the syscall index.
> > I've written myself a note to work on this (it shouldn't be hard).
>
> This would actually make even more sense for device drivers.
>
> As to system calls, what would you think about adding the name to
> `struct sysent' and then export some interface (sysctl?) for mapping
> between names and numbers to userland? (This is not totally unrelated
> to what Solaris does with /etc/name_to_sysnum.)
I'm not sure about that - the extra text in the kernel address space would
be pretty expensive for little return. I was thinking of a mechanism that
a program could use like this:
struct module_stat ms;
ms.version = sizeof(ms);
modstat(modfind("mysyscall"), &ms);
syscall(ms.u.intval, ...);
--
Doug Rabson Mail: dfr@nlsystems.com
Nonlinear Systems Ltd. Phone: +44 181 442 9037
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