swallace f62e0784cb Implement SA_NODEFER sa_flag for sigaction():
Add SA_NODEFER define to signal.h
	Add ps_nodefer field to struct sigacts in signalvar.h.
	Add code to kern_sig.c to handle SA_NODEFER.

If flag is set, when the signal is delivered, it is not masked automatically
from receiving the same signal again.

Reviewed by:	 wollman, bde
1995-10-19 19:16:01 +00:00
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