runghc in stdin mode ignores Ctrl-C on Windows, cannot be killed

[simonmar]

Moved from #2743.

[NeilMitchell]

I think this is actually a more general bug with GHC, rather than just runghc. Try for example:

main = print =<< getContents

On Windows XP this program cannot be aborted with Ctrl+C. I guess runghc uses code similar to read in the file, which is where the problem is.

This bug has already been reported on mailing lists under a few different guises, so is probably quite critical/

[simonmar]

In 6.8.3 you had to press ^{C twice to exit the program, which was also wrong. The new bug is actually a result of the way that we now deliver} C as an exception. Also, it works with -threaded (we had a dialogue with the darcs folks about making that work a while back).

I think I have a fix for the non-threaded case, will commit when I've validated.

[nominolo]

FWIW, I have a similar problem with a program that only reads from a socket using the network-bytestring package. I'll test it as soon as the fix hits HEAD.

[nominolo]

Ok, patch

Thu Nov 13 03:43:42 PST 2008  Simon Marlow <marlowsd@gmail.com>
 * notice ^C exceptions when waiting for I/O

fixes my problem mentioned above.

[simonmar]

oops, one more fix is required for runghc. Am validating now.

[simonmar]

These two patches need to be merged:

Thu Nov 13 03:43:42 PST 2008  Simon Marlow <marlowsd@gmail.com>
 * notice ^C exceptions when waiting for I/O

Fri Nov 14 05:09:58 PST 2008  Simon Marlow <marlowsd@gmail.com>
  * close the temporary Handle before removing the file

[igloo]

Merged