To: linux-kernel@vger.kernel.org
From: hpa@zytor.com (H. Peter Anvin)
Subject: Re: upcalls from kernel code to user space daemons
Date: Fri, 18 Jun 2004 23:08:29 +0000 (UTC)
Organization: Transmeta Corporation, Santa Clara CA
Message-ID: <cavsld$bem$1@terminus.zytor.com>
References: <1087236468.10367.27.camel@stevef95.austin.ibm.com>
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Followup to:  <1087236468.10367.27.camel@stevef95.austin.ibm.com>
By author:    Steve French <smfltc@us.ibm.com>
In newsgroup: linux.dev.kernel
>
> Is there a good terse example of an upcall from a kernel module (such as
> filesystem) to an optional user space helper daemon?   The NFS RPC
> example seems more complicated than what I would like as does the
> captive ioctl approach which I see in a few places.
> 

autofs does this by having the kernel write to the write-end of a
pipe, and have the userspace daemon read from the read end of the same
pipe.

The same thing can be done with sockets.

	-hpa

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