From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Tue,  6 Nov 2007 13:29:19 -0500
From: Robert William Fuller <hydrologiccycle@gmail.com>
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To: Fans of the OS Plan 9 from Bell Labs <9fans@cse.psu.edu>
Subject: Re: [9fans] Memory management questions/not plan-9 specific
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Paul Lalonde wrote:
> I have an application I'm building which requires OS support to allow a
> user-space function to fill a page on page-faults.  Ideally, I could
> reserve a chunk of address space but not back it with memory, and then
> on fault my handler would serve out data from some small cache of
> user-managed physical pages.
> 
> My google-fu has been weak in finding such a system-level API in any
> OS.  Has this got a name I should be searching on?  I can't believe
> no-one has implemented user-level page replacement.

In UNIX, set up a signal handler for SIGSEGV.