Re: lseek on tty

[Mouse <mouse%Rodents-Montreal.ORG@localhost>]

> On NetBSD and macOS, lseek(2) on a tty succeeds:

>         if (lseek(STDIN_FILENO, 0, SEEK_CUR) == -1 )

> On Linux, this fails.

> I'm trying to think of why seeking on a terminal would make sense.
> Anybody have an idea?

Quoting from lseek(2) on a handy machine:

	Some devices are incapable of seeking.  The value of the
	pointer associated with such a device is undefined.

So I'm guessing it depends on whether you think of adding something to
an undefined value makes sense.  To me, it does; the resulting value is
undefined, but the seek pointer is undefined anyway.

Also, I'd argue that lseek(,0,SEEK_CUR) makes sense on any descriptor,
since it's not trying to change anything.

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