/* IGNORE SIGNALS -- must be used inline */
#define ALL -1
#define OLDMASK() ((&__old))
#define NEWMASK() ((&__new))
#define IGNORE(sig)							\
  for (sigset_t __new, __old,						\
	 *__i = (memset(&__new, 0, sizeof(sigset_t)),			\
		 memset(&__old, 0, sizeof(sigset_t)),			\
		 (((sig) == ALL) ? (sigfillset(&__new) &&		\
				    (err(EXIT_FAILURE, "sigfillset"), 1)) \
		  : (sigaddset(&__new, sig) &&				\
		     (err(EXIT_FAILURE, "sigaddset"), 1))),		\
		 (sigprocmask(SIG_SETMASK, &__new, &__old) &&		\
		  (err(EXIT_FAILURE, "sigprocmask"), 1)),		\
		 (sigset_t *)1);					\
       __i; (sigprocmask(SIG_SETMASK, &__old, __i = NULL) &&		\
	     (err(EXIT_FAILURE, "sigprocmask"), 1)))