Date: Wed, 24 Dec 2008 19:44:45 +1100 From: Peter Jeremy <peterjeremy@optushome.com.au> To: Gerry Weaver <gerryw@compvia.com> Cc: freebsd-hackers@freebsd.org Subject: Re: How to access kernel memory from user space Message-ID: <20081224084445.GA1081@server.vk2pj.dyndns.org> In-Reply-To: <20081223000534.f740ca8a@mail01.compvia.com> References: <20081223000534.f740ca8a@mail01.compvia.com>
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--9amGYk9869ThD9tj Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On 2008-Dec-22 18:05:34 -0600, Gerry Weaver <gerryw@compvia.com> wrote: >I am working on a driver that collects various network statistics via >pfil. I have a simple array of structures that I use to store the >statistics. I also have a user space process that needs to collect >these statistics every second or so. The easiest (and hackiest) approach would be to kldsym(2) to locate the symbol in KVM and then mmap(2) the relevant part of /dev/kmem. The biggest downside is that the userland process needs to be group kmem. The other approach would be for your kernel driver to grow a character device node and directly support mmap. --=20 Peter Jeremy Please excuse any delays as the result of my ISP's inability to implement an MTA that is either RFC2821-compliant or matches their claimed behaviour. --9amGYk9869ThD9tj Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.9 (FreeBSD) iEYEARECAAYFAklR9n0ACgkQ/opHv/APuIfvVACeKikYkOgVs+vGls74HULRkf7F Zr4An2WzaJ2MCYK8OS1qkxLYRGdY7dIh =l3vR -----END PGP SIGNATURE----- --9amGYk9869ThD9tj--
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