From: ty@kau1.kodak.com (Trevor Yann)
Subject: Re: Gnu-Win32 and Tcl/Tk
17 Dec 1996 16:34:48 -0800
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Kirk W. Benson wrote:

>A couple of comments on interfacing Gnu-win32 and TCL:
>

stuff deleted

>b. File handles.  The DLL uses NT handles to represent open files within the
>channel structures.  Therefore, a channel cannot be registered with the DLL
>using an fd returned from a Gbu-win32 function.  Using an fd as an event
>source will require an API call which returns the NT Handle given a fd; a
>converse function to import a NT Handle into the fd space would also be needed.

Both Microsoft and Borland compilers provide the functions:

int _open_osfhandle(long handle, int flags)
        to obtain a file descriptor for a win32 handle

long _get_osfhandle(int filehandle)
        to obtain a win32 handle for a file descriptor

These functions are declared in io.h (which gnu-win32 does not currently have).

I'm not sure whether or not it would be straight forward to add these
functions, as some of the file descriptors have 2 associated file handles
(e.g. tty descriptors). Maybe it would be enough if these functions could be
implemented to work correctly with those file descriptors which require only
a single win32 handle.



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