Add copyright

only dump core if user has read permission on the text

make signal semantics more like system V;
non-super user can do `kill -1 1' to kill all processes run by them,
return ESRCH instaed of EINVAL for `kill 0 1' when not in a process group

eliminate extraneous include of conf.h

rewritten kill code from sun!shannon

give SIGCHLD on stop even if traced (once only)

add another bit to sigvec() flags to disable system call restart

eliminate signal() system call interface

Added SIGWINCH for windows

remove unused code

mask macro moved to header file and name changed to sigmask

Change to includes. no more ../h

add `signal' as a system call

rework `namei' interface to eliminate global variables

linked lists of active, zombie and free procs; avoid linear proc
searches wherever possible

If a process exists but has a different uid than the killer it should return
EPERM rather than ESRCH. (Bill Shanon)

4.2 distribution

from shannon; can't allow masked signals to be presented;
also, beware of ptrace taking child signal, then changing it to something

crud from previous interface not deleted

change NOCOMPAT to COMPAT and make it work

beware of masked signals with STRC

"final" sigvec interface?

new signals

kill with signal 0 allows for error checking without sending a signal
from shannon@sun.UUCP

merge of bill's code plus lint (plus, of course, cleanup of bill's bugs)