Initializes a signal set and fills it with all supported signals.
#include <signal.h> int sigfillset ( sigset_t *set );
(IN) Points to the signal set to initialize and fill.
If successful, returns 0. Otherwise, returns -1 and sets errno to indicate an error.
For a list of supported signals, see Section 5.1, Standard Signals. Each object of type sigset_t must be initialized once with a call to either sigfillset or sigemptyset before calling the other functions which manage the signal set.