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From: John Baldwin <jhb@freebsd.org>
To: freebsd-arch@freebsd.org
Subject: Re: Extending MADV_PROTECT
Date: Fri, 12 Jul 2013 17:48:57 -0400
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 (bigwig.baldwin.cx); Fri, 12 Jul 2013 18:25:22 -0400 (EDT)
Cc: Konstantin Belousov <kostikbel@gmail.com>, arch@freebsd.org,
 "Robert N. M. Watson" <rwatson@freebsd.org>, Jilles Tjoelker <jilles@stack.nl>
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On Friday, June 28, 2013 2:46:01 pm John Baldwin wrote:
> Ok, there isn't really a clear consensus here, but I need a system call to let
> me toggle this flag on existing processes.
> 
> One reason I don't like the procctl() approach is I am uneasy about forcing
> a certain behavior for how commands treat pgid (first-fail vs best-effort).
> I guess it can always change in the future so that isn't completely unsolvable.
> 
> I guess I am fine just making it use hardcoded sizes instead of full-blown
> ioctl encoding.

Ok, I have updated patches for this for HEAD.  I have not yet implemented the
inheritance bits because I'm loathe to add the first bit to a p_flag2. :-P
However, if that's the best course of action I suppose we can do that.

The kernel patch is at www.freebsd.org/~jhb/patches/procctl.patch

The patch for the protect binary is at www.freebsd.org/~jhb/patches/protect.patch

-- 
John Baldwin