SIG_DFL
#define SIG_DFL ((__sighandler_t *)0)
#define SIG_DFL (SIG_PF)0
#define SIG_DFL (void(*)(int))0
#define SIG_DFL (void(*)())0
#define SIG_DFL (SIG_PF)0
#define SIG_DFL (void(*)(int))0
#define SIG_DFL (void(*)(int))0