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From: brian@shift.utell.net (Brian Somers)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: kernel traces
Date: 19 Jun 1997 11:01:53 GMT
Organization: Awfulhak Ltd.
Lines: 24
Message-ID: <5ob3j1$2ro@ui-gate.utell.co.uk>
References: <5o9e5r$1ar@delphi.cs.ucla.edu>
Reply-To: brian@awfulhak.org, brian@utell.co.uk
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Xref: euryale.cc.adfa.oz.au comp.unix.bsd.freebsd.misc:43149
In article <5o9e5r$1ar@delphi.cs.ucla.edu>,
Renaud Bruyeron <bruyeron@cs.ucla.edu> writes:
> I am working on TCP, and I need to plot some state variables from the TCP code on FreeBSD 2.1.6. Those variables are not available through netstat, therefore I try to 'print' these variables, since I was told printf defaults to /var/log/message within the kernel.
> Even though I don't like the idea to use printf within this kind of code, I tried to, but was enable to find the result of the output anywhere:
>
> if( (tp->t_inpcb->inp_socket->so_options & SO_DEBUG) )
> printf(";TCP_VARS: cwnd=%d",tp->snd_cwnd);
>
> I inserted this piece of code at some intereting points in tcp_input.c, and I tried to enable SO_DEBUG with a setsockopt() call, but it does not work.
>
> Is there any kernel guru out there who could help me ? Is printf the normal way to go for this purpose (what about klog and log ?)
>
>
> Thanks for your help,
I use printf() - stuff comes out on the console. I've never needed to
find out how this is driven, but I suspect it routes through klog().
> - Renaud
--
Brian <brian@awfulhak.org> <brian@freebsd.org>
<http://www.awfulhak.org>
Don't _EVER_ lose your sense of humour !