K 10
svn:author
V 6
marius
K 8
svn:date
V 27
2016-01-27T22:48:04.840298Z
K 7
svn:log
V 511
MFC: r294362, r294414, r294753

- Fix tty_drain() and, thus, TIOCDRAIN of the current tty(4) incarnation
  to actually wait until the TX FIFOs of UARTs have be drained before
  returning. This is done by bringing the equivalent of the TS_BUSY flag
  found in the previous implementation back in an ABI-preserving way.
  Reported and tested by: Patrick Powell
- Make the code consistent with itself style-wise and bring it closer
  to style(9).
- Mark unused arguments as such.
- Make the ttystates table const.

END