4.4BSD snapshot (revision 8.1); add 1993 to copyright
use SIG_ERR, not BADSIG
new copyright notice
posix signals
add Berkeley specific header
added LIBC_SCCS condition for sccs ids
Add copyright
properly track SV_INTERRUPT, SV_ONSTACK, and mask
ENTRY macro changed.
date and time created 84/05/16 15:19:24 by ralph