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Re: Filter design for nsmux

From: olafBuddenhagen
Subject: Re: Filter design for nsmux
Date: Fri, 15 May 2009 19:35:06 +0200
User-agent: Mutt/1.5.18 (2008-05-17)


On Mon, May 11, 2009 at 10:18:59PM +0300, Sergiu Ivanov wrote:

> antrik told me to try to step into the dir_lookup call, but gdb does
> not want to comply with my desires... I installed hurd-dbg package (as
> antrik had recommended), but it didn't help.

Eh, right... You obviously need libc0.3-dbg for that rather than
hurd-dbg -- glibc is where most of the client side stuff resides. Sorry.

However, using libc-dbg is tricky: The symbols are not loaded
automatically, unlike with other -dbg packages. IIRC you have to set
LD_LIBRARY_PATH to /lib/debug/lib or something... Except that it doesn't
seem to work anymore :-( So I can't really help here.

Also note that for single-stepping, you need to get the source code as
well, and point gdb to the right location. (I used a trick in the past:
Create a symlink to make the source code appear at the same location as
it was on the build host, so gdb picks it up automatically...)

> However, everything looks to be very much like our supposition:
> dir_lookup does not even try to invoke the corresponding RPC and
> decides what to do on its own.

Again, guessing is not helpful. Single-stepping would be nice, but it
you can't do that, you can at least look up the code of the dir_lookup()
stub in the glibc tree, and try to understand what is actually going

(Note that the stubs are generated files, i.e. you have to build glibc
to look at them.)


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