converse of cygwin_attach_handle_to_fd()?

converse of cygwin_attach_handle_to_fd()?

[Samuel Thibault]

Hi,

cygwin_attach_handle_to_fd() lets create a cygwin fd on top of a windows
handle. When calling close() on the fd, the windows handle is closed
too. Is there any way to close the fd without closing the underlying
handle? (i.e. the converse of cygwin_attach_handle_to_fd(), actually)

The same question applies to mingw's open_osfhandle() actually.

Samuel

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RE: converse of cygwin_attach_handle_to_fd()?

[Dave Korn]

On 04 June 2006 00:10, Samuel Thibault wrote:

> Hi,
> 
> cygwin_attach_handle_to_fd() lets create a cygwin fd on top of a windows
> handle. When calling close() on the fd, the windows handle is closed
> too. Is there any way to close the fd without closing the underlying
> handle? (i.e. the converse of cygwin_attach_handle_to_fd(), actually)

  Well, the simple workaround would be to write a wrapper function for
cygwin_attach_handle_to_fd; the wrapper would call DuplicateHandle to get a
spare copy of the original handle and then pass that duplicated handle to
cygwin_attach_handle_to_fd instead of the original handle; that way, when you
close the fd, the duplicate of the handle is closed, entirely independently of
the original.

    cheers,
      DaveK
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Re: converse of cygwin_attach_handle_to_fd()?

[Brian Ford]

On Sun, 4 Jun 2006, Samuel Thibault wrote:

> (i.e. the converse of cygwin_attach_handle_to_fd(), actually)

get_osfhandle()?  I'm not sure of its close semantics, though.

-- 
Brian Ford
Lead Realtime Software Engineer
VITAL - Visual Simulation Systems
FlightSafety International
the best safety device in any aircraft is a well-trained pilot...

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