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From: Joshua Marantz <jmarantz@google.com>
Date: Thu, 24 Jul 2014 08:13:11 -0400
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 <CAGKR+EDnx=S4enYm98UgWB2LWHuExMzT4ieDmc=0xZ_w3JWPuQ@mail.gmail.com>
Subject: Re: sequence of request
To: "modules-dev@httpd.apache.org" <modules-dev@httpd.apache.org>
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Yes, in particular, the gdb feature that can help determine who is changing
r->filename is hardware watchpoints:
http://sourceware.org/gdb/onlinedocs/gdb/Set-Watchpoints.html

1. Set a breakpoint at a line of code where you believe r->filename is
correct
2. Start up Apache with "run -X"
3. Issue a request to the server to hit the line of code where r->filename
is set.
4. Set up a hardware watchpoint with
      (gdb) p &r->filename
      $1 = (char**) 0x....
      (gdb) watch *$1
      Hardware Watchpoint 2

Depending on what you've done in the debugger beforehand, the "$1" may be
something like $3 or $4.  In that case use watch *$3, etc.

-Josh


On Thu, Jul 24, 2014 at 6:54 AM, Eric Covener <covener@gmail.com> wrote:

> On Thu, Jul 24, 2014 at 12:51 AM, Donatas Abraitis
> <donatas.abraitis@gmail.com> wrote:
> > Hello guys,
> >
> > is it possible to know the sequence of request is handled? I mean which
> > module takes precedence? Because I need to debug why r->filename becomes
> > not so as I expected.
>
> mod_info shows you the order the loaded modules will run in for
> various phases.  A debugger can also tell you when it changes.
>
> --
> Eric Covener
> covener@gmail.com
>

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