linux-kernel - Re: Calling system call from User-mode Linux?

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Message-ID: <20100711021526.GA30049@c-98-229-117-200.hsd1.ma.comcast.net>
Date:	Sat, 10 Jul 2010 22:15:26 -0400
From:	Jeff Dike <jdike@...toit.com>
To:	Philip Wernersbach <philip.wernersbach@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Calling system call from User-mode Linux?

On Sat, Jul 10, 2010 at 05:55:48PM -0400, Philip Wernersbach wrote:
> I'm trying to add some functionality to User-mode Linux that requires
> the UML kernel to call a custom syscall I've added to the host kernel.
> This should be technically possible since UML runs in the userspace,
> but I can't figure out how to call the syscall, as the syscall()
> function isn't defined in UML. Are there other ways I can accomplish
> this?

Add a function in the userspace side of UML (arch/um/os-Linux) which
invokes your new system call through syscall(), and then call that
from wherever you need to.

				Jeff
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