bpo-31904: Skip some asyncio tests on VxWorks by pxinwr · Pull Request #23815 · python/cpython
VxWorks can't support termios and tty module. Reason: tty module is based on termios module. And VxWorks just has partial native support for POSIX termios spec.
VxWorks can't support os.openpty. Reason: VxWorks doesn't have apis openpty() and _getpty provided. It also has no devices /dev/ptc and /dev/ptmx defined.
VxWorks has no getitimer() and setitimer() C api available. So skipping impacted tests on VxWorks.