From owner-freebsd-hackers@freebsd.org Sat Jul 25 09:44:08 2015 Return-Path: Delivered-To: freebsd-hackers@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id BE6569A9F94 for ; Sat, 25 Jul 2015 09:44:08 +0000 (UTC) (envelope-from m.e.sanliturk@gmail.com) Received: from mail-ie0-x235.google.com (mail-ie0-x235.google.com [IPv6:2607:f8b0:4001:c03::235]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 8115A11F3; Sat, 25 Jul 2015 09:44:08 +0000 (UTC) (envelope-from m.e.sanliturk@gmail.com) Received: by iehx8 with SMTP id x8so34786308ieh.3; Sat, 25 Jul 2015 02:44:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; bh=F/+V4wnzf2azyUKF/eyThvwK2xWClbpvGtOoQafxd1I=; b=ZLhYy+6wifzf+L/oT+iXgpkUvaIeSoINRaKZwDFdAyrwXPkrQ3DjxAwT/TZLo+U9GK yGUVeX8f9orXErolV1gRzeN02TQHBcuVlgcoC/Hkme39brLTEEolvMrKNeXGfTtZhr0R +pX5rjnOueV+OboBRN5MNbJYL2qDzlnntFL9Bw3eQuC8jzNCKtj6drhkwA0YBF5rgAia rqduRiO/Jdo1ZCDMBjOU9ElS76+/dR/xh2Z5REJgnpdBaDl+YqkY3QuBEZB5BiqpMXyd 2otN4nfiTlqeSz3u73HUH+Q1dc2sBff9Xblcwcfs5QrcLAT4i0Y/aqktT6NKu3C1xye8 CpeQ== MIME-Version: 1.0 X-Received: by 10.50.36.101 with SMTP id p5mr3777637igj.58.1437817447603; Sat, 25 Jul 2015 02:44:07 -0700 (PDT) Received: by 10.65.15.33 with HTTP; Sat, 25 Jul 2015 02:44:07 -0700 (PDT) In-Reply-To: References: <514DDE7F-CF61-461D-A9FF-232DC938BDF5@FreeBSD.org> Date: Sat, 25 Jul 2015 02:44:07 -0700 Message-ID: Subject: Re: Kernel Debug Howto From: Mehmet Erol Sanliturk To: HeTak Cc: Kristof Provost , freebsd-hackers Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.20 X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 25 Jul 2015 09:44:08 -0000 On Sat, Jul 25, 2015 at 2:24 AM, HeTak wrote: > On Sat, Jul 25, 2015 at 1:41 PM, Kristof Provost wrote: > > > > > > On 25 Jul 2015, at 10:54, HeTak wrote: > > > I have recently started some developments on FreeBSD net section. > > Great! > > > =E2=80=8BThank you Kristof, b > oth for your fast answering and your welcome.=E2=80=8B :) > > > > > > But I am kinda new to this field. My base interest is to first > > understand the > > > implementation structure via tracing the code and so. > > > > > > I have three major questions: > > > 1- how to debug changes made to FreeBSD kernel? > > > (You know, till some levels, I can even use uprintf or so, but, for > > example > > > inside radix.c (where I wanna understand how a route is checked to be > > > unique and then inserted to the tree) I can't do such checks..) > > dtrace can be quite useful to understand flows. You can grab stack trac= es > > (i.e. figure out where things are called from), get function arguments,= =E2=80=A6 > > > > > 2- are there standards there for freebsd kernel developments of which= I > > can > > > follow so my job gets a bit simplified? > > > (Any development guides or so?I prospect it to be some differences > > between > > > system developments and normal coding, but I don't have an idea on ho= w > to > > > get that). > > There=E2=80=99s style(9) for coding style. > > I=E2=80=99d also recommend "The Design and Implementation of the FreeBS= D > Operating > > System=E2=80=9D > > (the second edition). > > > Perhaps , the following books may also be useful : https://www.nostarch.com/abs_bsd2.htm ( Absolute FreeBSD, 2nd Edition ) There is also a book by Michael W. Lucas about ZFS . https://www.nostarch.com/rootkits.htm ( Designing BSD Rootkits ) https://www.nostarch.com/bsddrivers.htm ( FreeBSD Device Drivers ) Mehmet Erol Sanliturk > > > 3- what is the fastest way to apply changes to FreeBSD kernel? > > > (For now, I just follow the normal build & install kernel & reboot.) > > I pretty much do that. Depending on what you=E2=80=99re working on it m= ight be > > easier to run it in a VM. > > My work lately has been on the network code, so a VM is very convenient= . > > It=E2=80=99s not so useful if you=E2=80=99re working on drivers, of cou= rse. > > > =E2=80=8B > =E2=80=8BGreat to hear of such a tool as Dtrace and also the book. and ac= tually I'm > using a VM as well. =E2=80=8B > > =E2=80=8BI'll check these and hope to be successful through my way. > > > > > Regards, > > Kristof > > > =E2=80=8BCheerio, > HeTak=E2=80=8B > _______________________________________________ > freebsd-hackers@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-hackers > To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org= "