int (*ssignal( int sig, int (*action)))) (void)

	- prototype in signal.h

	- ssignal() and gsignal() implement a software-signaling facility
	  where software signals are integers 1-15
	- ssignal() establishes an action routine for servicing a signal
	  where sig is associated with the action routine
	- ssignal() returns action previously established for ssignal()
	  or SIG_DFL
	- UNIX based