TIOCSTI on other systems

[Nelson H.F. Beebe]

TOPS-20 has had a Simulate Terminal Input (STI) system call
for years; BSD 4.x probably copied it.  It is of use for
other things besides mail.  For example, TeX (and my DVI
drivers), output a command to spool the output, but don't
write the final newline.  If the user wants the output
spooled, she just types a return; otherwise Ctl-U or Ctl-C
will cancel the request. STI can also be used to feed input
to a program that is hardwired to read from the terminal
(this is rarely a problem on UNIX, but TOPS-20 has a few
such examples).
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