Re: Isatty Error (x: ✘3.23.1 ??)

[Fred Wright]

On Mon, 13 Sep 2021, Gary E. Miller wrote:
> On Mon, 13 Sep 2021 17:46:44 -0700 (PDT)
> Fred Wright <fw@fwright.net> wrote:
>
> > It looks like it's being called after the device is closed.  Log
> > attached. Offending message at line 54.
>
> Almost:
>
> gpsd:INFO: closing GPS=udp://127.0.0.1:64963 (8)
> gpsd:ERROR: SER: gpsd_serial_isatty(8) failed: Device not configured(6)
> gpsd:IO: SER: gpsd_close(udp://127.0.0.1:64963), close(8)
>
> The UDP socket is clearly not a tty.  Your isatty() is correctly
> returning 0, but then setting errno = 6 (Device not configured).  But
> that is not a POSIX legal errno from isatty().
>
> And that is not even the proper POSIX.1-2001 description for errno = 6.
> It should be:
>
>    6  ENXIO    /* No such device or address */
>
> Easy fix.  Pushed to git head.
>
> What OS?  So I can notate why the non-POSIX code.

OSX 10.9.

Most uses of isatty() only care whether it's an open tty device or not, 
with errno being a don't care.

Fred Wright