Major Problem With Latest CYGWIN1.DLL And Serail IO

[George Abdelmalik]

Hi all,


I've encountered a problem in using serial ports (comm ports) with the 
latest cygwin snapshots.

The problem was first encountered in snapshot cygwin1-20040416.dll and with 
further testing i've
concluded that the issue remains with the most recent snapshots.  These 
being:
- cygwin1-20040422.dll
- cygwin1-20040420.dll
- cygwin1-20040416.dll

The problem occurs when a call to open() is made. Under WIN XP the open 
fails
after a few seconds of blocking. Under WIN 2000, the open is successful 
however
calls to  ioctl with TIOCMGET produce false results (i.e. obtaining the 
status
of DTR, RTS etc).

I think this is related to the changes 'Corinna Vinschen' made in the 
cygwin1-20040416.dll
snapshot, specifically:

(fhandler_base::open): Rearrange to use NtCreateFile instead of CreateFile.

This problem does not occur in snapshots previous to cygwin1-20040416.dll.

I've written a piece of code which demonstrates this issue, and have 
attached it to this
posting. I would appreciate it if people could verify this issue by running 
the attached
code.

To compile:
make all

To run:
./openfault

Tested system configurations:
- WIN XP
  256MB RAM
  P4 @ 1.6 GHz
  SP1

- WIN 2000
  192MB RAM
  P4 @ 1.2 GHz
  SP1


I've also attached the cygcheck for the WIN XP system.

george.

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