SIG_ERR
#define SIG_ERR ((__sighandler_t *)-1)
# define SIG_ERR ((sigtype) -1)
# define SIG_ERR ((void (*)()) -1)
#define SIG_ERR (SIG_PF)-1
#define SIG_ERR (void(*)(int))0
#define SIG_ERR (void(*)())-1
#define SIG_ERR (SIG_PF)-1
#define SIG_ERR (void(*)(int))0
#define SIG_ERR (void(*)(int))-1