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Date: Mon, 26 Feb 2001 15:08:27 +0100
From: Corinna Vinschen <cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: lseek() fails to seek on /dev/fd0 ('\\.\A:')
Message-ID: <20010226150827.N27406@cygbert.vinschen.de>
Mail-Followup-To: cygwin AT cygwin DOT com
References: <u67ae79bw6v DOT fsf AT rachel DOT hq DOT vtech> <u671ysl8xda DOT fsf AT rachel DOT hq DOT vtech>
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In-Reply-To: <u671ysl8xda.fsf@rachel.hq.vtech>; from jojo@virtutech.se on Mon, Feb 26, 2001 at 01:03:29PM +0100

On Mon, Feb 26, 2001 at 01:03:29PM +0100, Jesper Eskilson wrote:
> Jesper Eskilson <jojo AT virtutech DOT se> writes:
> 
> > Why is it ok to seek to 0 bytes and 1 byte, but not 2?
> 
> The test-program passed parameters in the wrong order, the correct order is
> 
>         lseek(fd, pos, whence)
> 
> However, this was not the error I was really trying to fix (the real
> program passed the parameters in the correct order). The real problem was
> that lseek() fails when doing SEEK_END on a raw device. On Linux and
> Solaris, lseek() return 0 when doing SEEK_END on raw devices.

My catchword. SEEK_END is not supported on raw devices by Cygwin
currently. The reason is that the Windows function SetFilePointer()
returns EINVAL or sth similar when called with FILE_END on raw disk
devices. Since I didn't get any meaningful result when calling
GetFileSize() either, I currently don't have a way to support
SEEK_END. Hints welcome.

Corinna

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Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Developer                                mailto:cygwin AT cygwin DOT com
Red Hat, Inc.

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