> -Original Message-
> From: Geoff Clare [mailto:g...@opengroup.org]
> Sent: Wednesday, October 11, 2017 5:51 PM
> To: austin-group-l@opengroup.org
> Subject: Re: Proper way to use an updating FILE on a tty?
>
> Nick Stoughton wrote, on 10 Oct 2017:
> >
>
Nick Stoughton wrote, on 10 Oct 2017:
>
> On Tue, Oct 10, 2017 at 7:46 AM, Schwarz, Konrad wrote:
>
> > POSIX FILE streams opened for update need either a fflush() or a file
> > positioning function
> > when switching from writing to reading, and a file positioning function
> > when
> > switchin
XBD 3.172 defines a File Offset:
3.172 File Offset
The byte position in the file where the next I/O operation begins. Each
open file description
associated with a regular file, block special file, or directory has a file
offset. A character special
file that does not refer to a terminal device may
