Mail Archives: cygwin/2002/11/06/19:09:38
Christopher,
thanks for the info. If I pass any "/dev/com" to
_cygwin_attach_handle_to_fd() it core dumps :-(.
What is the significance of the name param. Does it create a device node
within the cygwin layer??
Can it be any path?? I am guessing from what you said, that if it is any
random path, it is assumed to be a fast device?
Thanks for your help
Sanjay
On Wed, Nov 06, 2002 at 04:22:18PM -0500, sanjayl AT mindspring DOT com wrote:
>Hi Mark,
>
>I am running Cygwin on Windows 2000. Here is the output of uname -a
>
>
>
>CYGWIN_NT-5.0 REDBSUNJAY1 1.3.14(0.62/3/2) 2002-10-24 10:48 i686 unknown
>
>And here is a short program that can reproduce the bug. I just
>CreateFile() COM0 and then map it to a cygwin file desciptor. I then
>read() on the fd. At this point the program stops responding to any
>signals (CTRL-C) etc, until some data shows up on the device to wake up
>the read. I just use g++ com.cpp to compile the executable.
Theoretically, if you pass "/dev/com0" to the "cygwin_attach_handle_to_fd"
it would work correctly. If you don't pass the name of a known device to
cygwin_attach_handle_to_fd it assumes it is a fast device for which no
special signal handling is necessary. So, if it blocks, it will not respond
to signals, as you've discovered.
cgf
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