From: Doug McNaught <doug@wireboard.com>
To: Mihai Moise <mcartoaj@mat.ulaval.ca>
Cc: linux-kernel@vger.kernel.org
Subject: Re: adding a system call
Date: 09 Jan 2001 14:17:26 -0500 [thread overview]
Message-ID: <m3snmsbkmx.fsf@belphigor.mcnaught.org> (raw)
In-Reply-To: <200101091441.JAA12925@taylor.mat>
In-Reply-To: Mihai Moise's message of "Tue, 9 Jan 2001 09:41:21 -0500 (EST)"
Mihai Moise <mcartoaj@mat.ulaval.ca> writes:
> My system call idea is to allow a superuser process to request a mmap on
> behalf of an user process. To see how this would be useful, let us consider
> svgalib.
[...]
> With my new system call, a superuser process can set the graphics mode in a
> safe manner and then ask for an mmap of the video array into the application
> data segment.
Ummm, couldn't the the root process open the video device, then pass
the file descriptor (via AF_UNIX socket) to the user process? The
user process would then call mmap() on the open file descriptor.
I'm not *completely* sure this would work, but it would avoid creating
a new system call if so.
-Doug
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next prev parent reply other threads:[~2001-01-09 19:17 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-01-09 14:41 adding a system call Mihai Moise
2001-01-09 19:17 ` Doug McNaught [this message]
2001-01-09 19:34 ` Brian Pomerantz
-- strict thread matches above, loose matches on Subject: below --
2001-01-09 0:49 Mihai Moise
2001-01-09 14:56 ` David Woodhouse
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