Konstantin Belousov 7d7fad7bd9 Add tcgetwinsize(3) and tcsetwinsize(3) to termios
These functions get/set tty winsize respectively, and are trivial wrappers
around corresponding termio ioctls.

The functions are expected to be a part of POSIX.1 issue 8:
https://www.austingroupbugs.net/view.php?id=1151#c3856.
They are currently available in NetBSD and in musl libc.

PR:	251868
Submitted by:	Soumendra Ganguly <soumendraganguly@gmail.com>
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D27650
2020-12-25 20:43:09 +02:00
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