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-This directory contains code for two line disciplines which may
-work with BSD-style terminal drivers.  While I'll try to cover
-installation details for the more useful one here as best I can,
-you really should know what you are doing before attempting to
-put one of these in your kernel since the details seem to vary
-from BSD variant to BSD variant.
-
-Tty_clk.c contains a generic clock support line discipline.
-The terminal driver is actually run in raw mode, giving you an
-eight bit data path.  Instead of delivering the data
-character-by-character, however, the line discipline collects
-characters until one of two magic characters (your current erase
-and kill characters.  Don't throw up) is received.  A timestamp
-is then taken (by calling microtime()), inserted in the input
-buffer after the magic character, and the whole mess made available
-for input by the application.  Both select() and SIGIO are supported
-by the discipline.
-
-Tty_chu.c is a special purpose line discipline for receiving
-the CHU time code.  It understands enough about the format of the
-code CHU transmits to filter out errors, and delivers an entire
-ten character code group to the application all at once, including
-a timestamp for each character.  The structure the code group is
-delivered in is defined in chudefs.h.  Note that this line discipline
-is old and could use some rewriting for better portability.  Please
-drop me a line if you are interested in using this.
-
-To install the clock line discipline, do something like the following:
-
-(1) Copy tty_clk.c into /sys/sys
-
-(2) Edit /sys/sys/tty_conf.c.  You will want to include some facsimile
-    of the following lines:
-
-#include "clk.h"
-#if NCLK > 0
-int	clkopen(), clkclose(), clkwrite(), clkinput(), clkioctl();
-#endif
-
-#if NCLK > 0
-	{ clkopen, clkclose, ttread, clkwrite, clkioctl,
-	  clkinput, nodev, nulldev, ttstart, nullmodem,	/* 10- CLKLDISC */
-	  ttselect },
-#else
-	{ nodev, nodev, nodev, nodev, nodev,
-	  nodev, nodev, nodev, nodev, nodev,
-	  nodev					    },
-#endif
-
-    In Ultrix 4.2a and 4.3 the file to edit is /sys/data/tty_conf_data.c.
-    The lines should be
-
-#if NCLK > 0
-	clkopen, clkclose, ttread, clkwrite, clkioctl,          /* 10 */
-	clkinput, nodev, nulldev, ttstart, nulldev,
-#else
-	nodev, nodev, nodev, nodev, nodev,
-	nodev, nodev, nodev, nodev, nodev,
-#endif
-
-    Note that if your kernel doesn't include the ??select() entry in
-    the structure (i.e. there are only 10 entry points in the structure)
-    just leave it out.  Also note that the number you give the line
-    discipline (10 in my kernel) will be specific to your kernel and
-    will depend on what is in there already. The entries sould be in
-    order with no missing space; that is, if there are only seven
-    disciplines already defined and you want to use 10 for good reason,
-    you should define a dummy 9th entry like this
-
-	nodev, nodev, nodev, nodev, nodev,                      /* 9 */
-	nodev, nodev, nodev, nodev, nodev,
-
-(3) Edit /sys/h/ioctl.h and include a line (somewhere near where other
-    line disciplines are defined) like:
-
-#define	CLKLDISC	10		/* clock line discipline */
-
-    The `10' should match what you used in /sys/sys/tty_conf.c.
-
-(4) Edit /sys/conf/files and add a line which looks like:
-
-sys/tty_clk.c		optional clk
-
-(5) Edit the configuration file for the machine you want to use
-    the clock line discipline on to include the following:
-
-pseudo-device	clk 4
-
-(6) Run config, then make clean, then make depend, then make vmunix.
-    Then reboot the new kernel.