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Date: Mon, 26 Feb 2001 16:02:25 +0300
From: Egor Duda <deo AT logos-m DOT ru>
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Reply-To: Egor Duda <cygwin AT cygwin DOT com>
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Message-ID: <613331659.20010226160225@logos-m.ru>
To: Jesper Eskilson <jojo AT virtutech DOT se>
CC: cygwin AT cygwin DOT com
Subject: Re: lseek() fails to seek on /dev/fd0 ('\\.\A:')
In-reply-To: <u671ysl8xda.fsf@rachel.hq.vtech>
References: <u67ae79bw6v DOT fsf AT rachel DOT hq DOT vtech> <u671ysl8xda DOT fsf AT rachel DOT hq DOT vtech>
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Hi!

Monday, 26 February, 2001 Jesper Eskilson jojo AT virtutech DOT se wrote:

JE> However, this was not the error I was really trying to fix (the real
JE> program passed the parameters in the correct order). The real problem was
JE> that lseek() fails when doing SEEK_END on a raw device. On Linux and
JE> Solaris, lseek() return 0 when doing SEEK_END on raw devices.

Single  Unix Specification v2 states that "The behaviour of lseek() on
devices  which  are  incapable of seeking is implementation-dependent.
The  value  of  the  file  offset  associated  with  such  a device is
undefined." and
" The lseek() function will fail if:
    ...
    [EINVAL]
        The whence argument is not a proper value, or the resulting file offset
        would be invalid. 
    ...
"

Win32   API   doesn't  allow  seeking  from the end of floppy devices,
so  i  think   it's   pretty   reasonable  for  cygwin  to  return  -1
with errno==EINVAL in this case.

Anyway,  if  we  decide to be linux- and solaris- compatible here, the
patch would be trivial.

Egor.            mailto:deo AT logos-m DOT ru ICQ 5165414 FidoNet 2:5020/496.19



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