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Date:	Fri, 1 Sep 2006 14:00:41 -0400
From:	Christopher Faylor <cgf-no-personal-reply-please AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: cygwin fork()
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On Fri, Sep 01, 2006 at 06:57:10PM +0100, Dave Korn wrote:
>On 01 September 2006 18:47, clayne AT anodized DOT HIPPO wrote:
>>I found the real culprit, which I had also ifdef'd out because it looked
>>bogus and crufty:
>>
>>/* Return 1 if a seek on FD will succeed. */
>>#ifndef __CYGWIN__
>>#  define fd_is_seekable(fd) (lseek ((fd), 0L, SEEK_CUR) >= 0)
>>#else
>>#  define fd_is_seekable(fd) 0
>>#endif /* __CYGWIN__ */
>
>Yeeesh.  This is a terrible way of dealing with the fact that you can't
>seek a stream accurately if you open it in text mode, because of the
>ambiguity about whether you've advanced one or two chars through the
>underlying file when you see an LF that could perhaps have actually
>been a CR/LF.  What we really want is

AFAIK, Cygwin's lseek should handle seeking on text streams.  DJ
implemented that years ago.

cgf

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