Date: Sat, 14 Jun 2008 09:55:32 +1000 From: Fraser Tweedale <frase@frase.id.au> To: freebsd-hackers@freebsd.org Subject: Re: How to probe what application does in kernel (with sound device)? Message-ID: <20080613235531.GA91339@bacardi> In-Reply-To: <4852CFE8.8040003@rawbw.com> References: <4852CFE8.8040003@rawbw.com>
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On Fri, Jun 13, 2008 at 12:52:08PM -0700, Yuri wrote:
> I have linux skype that complains that it can't use sound device without=
=20
> giving any details.
> 'truss -f' flag doesn't show any system calls related to sound device=20
> (/dev/dsp*). Maybe it's because of child processes aren't really=20
> monitored by truss for linux processes.
> But sound from another sound application gets some strange interruption=
=20
> and buzz every time I try to activate sound from skype. That's how I=20
> know that skype really does something with sound device.
>=20
> Is there a way to probe program's activity with devices in-kernel?
>=20
> Yuri
>=20
ktrace(1)
=46rom man page:
The ktrace utility enables kernel trace logging for the specified pro-
cesses. Kernel trace data is logged to the file ktrace.out. The kern=
el
operations that are traced include system calls, namei translations, s=
ig-
nal processing, and I/O.
frase
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