Instead of special casing SIGKILL, pretend that trap
succeeded every time sigaction failed [suggested by mycroft]

Fake trapping SIGKILL, because we know it will fail.

J.T. Conklin's changes for signals mean that we don't need all
of the random signal crap any longer

4.4BSD snapshot (revision 8.1); add 1993 to copyright

jflag -> mflag, is_interactive is not global

use sigaction to determine state of signal

restore exit status after a trap.

date and time created 91/03/07 20:28:01 by bostic