[Bug 39793] Starcraft freezes when starting a Direct Cable Connection game

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=39793

--- Comment #7 from Alex Henrie <alexhenrie24 at gmail.com> ---
Created attachment 53320
  --> https://bugs.winehq.org/attachment.cgi?id=53320
Test program that demonstrates the problem

The attached program replicates what Starcraft is doing. Because WriteError
fails with ERROR_NOT_READY, the event in the OVERLAPPED structure never fires
and the program stalls.

If COM1 is a real serial port, this program will print:

    Waiting for the write operation to successfully complete...
    The write operation finished successfully.

If COM1 is not a real serial port, this program will print:

    The device is not ready.
    Waiting for the write operation to successfully complete...

The tests in the function read_file_test in dlls/ntdll/tests/file.c indicate
that ReadFile does not fire events if there is an error, which strongly
suggests that Wine's identical behavior for WriteFile is also correct. Still,
it would be nice to have more tests specifically for WriteFile.

During boot, Windows checks (by executing NTDETECT) which COM ports are
physically present. If COM1 was not detected at boot, CreateFile("COM1", ...)
fails, avoiding the problem with Starcraft. By mimicking this behavior, Wine
can avoid the problem with Starcraft too.

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