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Date:	Tue, 04 Feb 2003 13:22:43 -0500
From:	Jason Tishler <jason AT tishler DOT net>
Subject:	Re: mmap() issue affects cygipc (and PostgreSQL's PL/Tcl)
In-reply-to:	<20030204174804.GI5822@cygbert.vinschen.de>
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Message-id:	<20030204182243.GB1400@tishler.net>
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References:	<20030204165929 DOT GA1400 AT tishler DOT net>
	<20030204174804 DOT GI5822 AT cygbert DOT vinschen DOT de>

Corinna,

On Tue, Feb 04, 2003 at 06:48:04PM +0100, Corinna Vinschen wrote:
> On Tue, Feb 04, 2003 at 11:59:30AM -0500, Jason Tishler wrote:
> > The root cause of the problem is opening the file with the "O_TRUNC"
> > flag -- without it, the open (in open2) succeeds.  Unfortunately,
> > cygipc seems to need open with truncation semantics for proper
> > operation.
> 
> I'm surprised that this is meant to work at all.

Me too.  Looking "under the hood" of cygipc, is a little scary... :,)

> However, did you check to omit the O_CREAT?

Yes, and I just tried again to be sure.  Without O_CREAT (but with
O_TRUNC) still fails in the same way, without O_TRUNC (but with O_CREAT)
does not fail.

> I could easiliy imagine that Win32 doesn't like to remove and recreate
> a file which is mmapped currently...

Me too.

Any other ideas?  Or, are Cygwin PostgreSQL PL/Tcl users out of luck
then?

Thanks,
Jason

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