ptrace problem - confounded, dazed and confused at the inconsistencies

[Valery Reznic]

--- On Wed, 10/27/10, Shachar Shemesh <shachar at shemesh.biz> wrote:

> From: Shachar Shemesh <shachar at shemesh.biz>
> Subject: ptrace problem - confounded, dazed and confused at the inconsistencies
> To: "linux-il" <linux-il at cs.huji.ac.il>
> Date: Wednesday, October 27, 2010, 2:07 PM
> Hi all,

Hi, Shachar.

> 
> I know that so much as types "man ptrace" is stepping into
> uncharted territory, that I should abandon hope all ye' who
> enter here, etc.
OK, you was warned :)

> 
> How can two programs do the same thing on the same system,
> and yet get such different results?
Let's take 'read' syscall. 
read(10, ....)

If one program open file descriptor 10 and another - not, than obviously
read will produce different results.

I suspect there is something like this in your case.
May be there is something that strace do and fakeroot-ng don't?
Setting some flag(s) to clone? Calling some system call that affect wait behaviour?

Valery.
> 
> Shachar
> 
> [1] http://fakeroot-ng.lingnu.com
> 
> -- Shachar Shemesh
> Lingnu Open Source Consulting Ltd.
> http://www.lingnu.com
> 
> 
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