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Re: System call support in reversible debugging
- From: Sean Chen <sean dot chen1234 at gmail dot com>
- To: Michael Snyder <msnyder at vmware dot com>
- Cc: Hui Zhu <teawater at gmail dot com>, "gdb at sourceware dot org" <gdb at sourceware dot org>
- Date: Fri, 4 Dec 2009 23:45:56 +0800
- Subject: Re: System call support in reversible debugging
- References: <5e81cb500911262231g57f693dwc885576172e016e1@mail.gmail.com> <5e81cb500911270742j546062f2jca7441a912ffad87@mail.gmail.com> <4B10154F.7070902@vmware.com> <5e81cb500911271745t1a119520l4944919d2139e8ae@mail.gmail.com> <4B11607C.7000500@vmware.com> <daef60380911300427p20b2e9bege4087bbcd18bc82a@mail.gmail.com> <5e81cb500911300539r52e8be5dva54d32c734978021@mail.gmail.com> <4B142C54.7070207@vmware.com> <5e81cb500912021857i3b0d8f42rde841973757b2d48@mail.gmail.com> <4B17EE0D.6010702@vmware.com>
On Fri, Dec 4, 2009 at 12:57 AM, Michael Snyder <msnyder@vmware.com> wrote:
> Sean Chen wrote:
>>
>> On Tue, Dec 1, 2009 at 4:34 AM, Michael Snyder <msnyder@vmware.com> wrote:
>>>
>>> Not a black box -- but not a detailed implementation either.
>>> Each system call has a specification -- that's all we need to
>>> understand. ÂThe specification tells what user-visible external
>>> side effects can be expected (eg. this buffer will be filled).
>>> Changes that are internal to the kernel do not concern us.
>>
>> Thanks. I understand your concern. Does Linux kernel provide such an
>> official specification? If so, could you throw me a hint on where to
>> get it? Since we have all of the side effects, recording the system
>> calls are feasible and trustable.
>>
>>> Sean, this stuff is already implemented and working.
>>> Why don't you have a look at the existing code in
>>> linux-record.c? ÂIt sounds like you're more than qualified
>>> to understand it. ÂIf you find something that's not working
>>> correctly, please let us know! Â;-)
>>
>> I am reading the source and the archive of the mailing list. Do you
>> have other systematic documents on this technique? Life becomes better
>> with your help. Thanks. :)
>
> Teawater implemented them, I am only reverse-engineering
> them, like you. ÂMan pages are helpful. Â ;-)
>
>
Man pages just tell how to use it. It wonât tell why use it. ï
Hui,
Could you help with this? Thanks in advance.
--
Best Regards,
Sean Chen