Mail Archives: cygwin/2010/12/21/17:06:18
On Dec 10 14:37, Estabrook, Edward wrote:
>> Generally I am seeking information regarding:
>> 1) Where can I download and install an older version of Cygwin (say
>> 1.5 era) to test if the problem is newly introduced?
>
> Corinna wrote:
What for? If it doesn't work on 1.5 you're exactly at the same spot as
>now. If it works on 1.5, we know it works on 1.5 but we still don't
>know why it doesn't work on 1.7, which means, you're still exactly at
>the same spot as now. So that's not really an option. The best option
>is either to debug the (slim) layer in Cygwin which provides send/recv,
>or at least to send an as-simple-as-possible, self-sufficient testcase,
>preferredly in plain C, which allows to reproduce the problem.
Two reasons. If it works on 1.5, I'll simply use it to perform my testing
and the time-pressure to solve the root cause is lessened.=20=20
Whether it works or not, it'll tell me if the issue is a change between=20
those versions or something older. (Plus the build instructions and=20
distributed executable are for SIPp are written with cygwin 1.5 in mind.
The setup-legacy installer for older versions of Windows is exactly what I
needed. I tested this out and confirmed the issue exists in the old versio=
n as well.
>> 2) What tools are available to measure potential packet loss within
>> cygwin itself? (the Windows stack is not reporting dropped UDP
>> packets, and the packets are not even making it into a locally running
>> instance of wireshark). Is there a way to dump / access / sniff the
>> inputs and outputs to the cygwin IP stack? Traffic volume is low so
>> verbosity would not pose a problem.
>
> Corinna wrote:
>You can add debug output to Cygwin's send and receive functions and use
>strace.
OK, thanks. I see debug_printf() and syscall_printf() statements sprinkled=
around the source. Where do these end up displayed / logged? How are the=
y enabled?=20=20
> Corinna wrote:
>Apart from actual debugging it yourself, a testcase, as outlined above,
>might be helpful. The details describe *what* happens, but unfortunately
>don't even allow to guess *why* it happens.
Understood. I need to perform more investigation before I can guess why, e=
ither.
Best Regards,
Ed
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