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[gerard patel]

On Wed, 05 Dec 2001 12:27:32 +0000, "T REX" <the1trex at hotmail.com>
wrote:

>Hmm well it is a posibilty, the weird thing here is that the Thinkboxx
>does not use hardware flow controll, this i know since the serial cabel
>suplied only has three pins where two are data and one is ground.
>I think that the lacking support may be conusing the error, but why does it
>work under windows when hardware flow controll is not available.
>The program must be relaying on software flow controll,
>does windows use software flow controll that emulates DTS/DTR signals.
>
>The fact that it is the lacking 1024 bytes that couses the problem strongly
>supports the teory that the problem resides in the serial communication.
>Maybe that when the thinkboxx sends an request, this request for some reason 
>does not rach the comm port or that the answer dont, maybe i hawe a wronlgly
>configured flow controll.
>
>On windows the program does not hang ewen when nothing is connected to the 
>comm port so it cant be getting the 1024 bytes there either but it dosnt 
>hang,

It could be that Windows just times out. 
Could you try to apply to dlls/kernel/comm.c 
the following patch :

--- comm.c.orig Fri Nov 30 18:46:43 2001
+++ comm.c      Wed Dec  5 14:34:30 2001
@@ -1392,6 +1392,13 @@
         return FALSE;
     }
 
+    TRACE("timeouts=%ld %ld %ld %ld %ld\n",
+           lptimeouts->ReadIntervalTimeout,
+           lptimeouts->ReadTotalTimeoutMultiplier,
+           lptimeouts->ReadTotalTimeoutConstant,
+           lptimeouts->WriteTotalTimeoutMultiplier,
+           lptimeouts->WriteTotalTimeoutConstant);
+
     SERVER_START_REQ( set_serial_info )
     {
         req->handle       = hComm;

and post the part of the trace with SetCommTimeouts,
this would show what are the values passed to this Api.

Gerard