SIGINT not delivered on Ctrl-C

[Chuck Taylor <ctaylor2901 at yahoo dot com>]

Does anyone know why a SIGINT signal would fail to be
delivered to a Cygwin-linked process (via Ctrl-C) in
the scenario where all of the following conditions
hold?

1) Process in question is launched from a
non-Cygwin-linked program (such as native Windows
command prompt), with all of stdin, stdout, and stderr
redirected.

2) Process registers a SIGINT handler via Cygwin's
implementation of signal() and waits for signal to be
delivered.

Attaching a WinDBG to the process in question shows
that the process is indeed receiving the Ctrl-C
exception from Windows.  However, program behavior
proves that the SIGINT handler is not being called. 
If any of the stdio channels are left unredirected, or
if process is launched from a Cygwin-linked program
(e.g. from bash instead of non-Cygwin-linked program),
then SIGINT is delivered successfully.


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