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Message-ID:	<36D63EB0.7FF0C3E9@netwood.net>
Date:	Thu, 25 Feb 1999 22:26:57 -0800
From:	"E. Robert Tisdale" <edwin AT netwood DOT net>
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To:	cygwin AT sourceware DOT cygnus DOT com
Subject:	Re: setmode (long)
References:	<199902260257 DOT UAA08616 AT modi DOT xraylith DOT wisc DOT edu>

Mumit Khan wrote:

> I believe Pierre has something here.
> I took another look at your code,
> and you're changing the mode of a buffered stream!
> Could you flush the stream (stream << flush)
> before changing the mode and see what happens?

No, I can't just now.
I sent the computer with Windows 98
and the DJPP and Cygnus compilers to my brother-in-law.
You'll have to wait until I can fire up my old Windows 95.

> I don't believe that your code is well-defined,
> since changing anything for an underlying descriptor
> of a buffered stream without flushing
> is not guaranteed to produce the desired effect.

Can you tell me where I can get documentation
for this behavior in setmode?
I got the file descriptors for standard I/O from

0 == (cin.rdbuf())->_fileno
1 == (cout.rdbuf())->_fileno
2 == (cerr.rdbuf())->_fileno

because a
ostdiostream has a
stdiobuf which is a
filebuf which is a
streambuf which is a
_IO_FILE which has an
int _fileno.

Is there a portable way to get file descriptors
for cin, cout, cerr and clog?

I suspect that Pierre may indeed have part of the answer
for his Windows 95 OS and his Emacs shell
but it doesn't explain why my `test.out' files
appear to be written in binary mode
even when the last mode set is text mode.

E. Robert Tisdale <edwin AT netwood DOT net>




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