[Patch]: Fixing the PROCESS_DUP_HANDLE security hole (part 1).

[Christopher Faylor]

On Sun, Dec 07, 2003 at 10:24:31PM -0500, Pierre A. Humblet wrote:
>It's mostly fine (rxvt and notty) but starting the following from DOS
>creates a slew of warning from the handler protection code (below).
>However the shell is functional.
>tty reports /dev/tty, instead of /dev/ttyN with 1.5.5
>
>@echo off
>set CYGWIN=tty
>C:
>chdir \progra~1\cygwin\bin
>bash --login -i

This is odd, since this is specifically how I tested cygwin prior to checking
everything in.  I can't duplicate this.

I initially couldn't duplicate the 'tty' problem either, but after my
15th clean rebuild, I did see it.  I don't know why I wasn't seeing it
before.

I've checked in a fix for the ttyname and a shot in the dark for the
mark_closed problems.

cgf