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Message-ID: <008501c14183$d9eddc10$d2823bd5@dmitry>
From: "Dmitry Timoshkov" <dmitry AT baikal DOT ru>
To: <cygwin AT cygwin DOT com>
References: <077d01c1400e$2d92cdc0$d2823bd5 AT dmitry> <20010918101238 DOT H22900 AT cygbert DOT vinschen DOT de>
Subject: Re: fcntl(F_SETFD) on a file or socket handle
Date: Thu, 20 Sep 2001 12:24:06 +0900
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"Corinna Vinschen" <cygwin AT cygwin DOT com> wrote:

[skipped]

> > I didn't investigate it further, and probably will not have time in the near
> > future to do so. Sorry.
> 
> :-(
> 
> You could at least send a testcase if you don't want to debug it.

Analyzing Cygwin code, it seems I have found the source of the problem (had no
time to confirm it running offending code though).

It's in the fhandler_base::set_inheritance() called from fhandler_base::set_close_on_exec().

DuplicateHandle()/CloseHandle() invalidates original system handle associated
with the Cygwin internal file descriptor (fd) while an operation on the fd is
possibly still in progress.

--
Dmitry.


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