> 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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