David van Moolenbroek 20173cb5d7 TTY: fix for PTY open/close logic
Opening and closing the master side of a pseudo terminal without
opening the slave side would result in the pseudo terminal becoming
permanently unavailable.  In addition, reopening the slave side
would be possible but not allow for I/O.  Finally, attempting to
open an in-use master would wipe its I/O state.  These issues have
been resolved.

Change-Id: I9235e3d9aba321803f9280b86b6b5e3646ad5ef3
2014-02-18 11:25:03 +01:00
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