Module Name:	src
Committed By:	kleink
Date:		Tue Jan 12 00:16:40 UTC 1999

Modified Files:
	src/sys/compat/svr4: svr4_signal.c
Log Message:
If a null pointer argument is passed to setcontext(), exit the process; it
would appear that overloading the argument this way is used by SVR4 to `fall
off' the main context (uc_link being NULL) after a function set up using
makecontext() returns.