sigemptyset - initialize and empty signal set

Syntax	#include <signal.h> int sigemptyset(sigset_t *set);
Description	sigemptyset() initializes the signal set pointed to by set in a manner that excludes all the signals defined in the system.
Return val.	0 -1	if successful. if an error occurs.
Notes	Applications should call sigemptyset() or sigfillset() for each object of type sigset_t prior to any other use of that object. If such an object is not initialized in this way, but is nonetheless supplied as an argument to any of sigaction(), sigaddset(), sigdelset(), sigismember(), sigpending() or sigprocmask(), the behavior is undefined.
See also	sigdelset(), sigemptyset(), sigfillset(), sigismember(), signal.h.