int gsignal( int sig )

	- prototype in signal.h

	- ssignal() and gsignal() implement a software-signaling facility
	  where software signals are integers 1-15
	- gsignal() raises the signal given by sig and executes the action
	  routine
	- gsignal() returns value by action or SIG_IGN or SIG_DFL
	- UNIX based
	- see	ssignal()