sigaltstack       841 maint/gnulib/lib/sigsegv.c   if (sigaltstack (NULL, &ss) >= 0)
sigaltstack       844 maint/gnulib/lib/sigsegv.c       sigaltstack (&ss, NULL);
sigaltstack      1343 maint/gnulib/lib/sigsegv.c     if (sigaltstack (&ss, (stack_t*)0) < 0)
sigaltstack      1377 maint/gnulib/lib/sigsegv.c     if (sigaltstack (&ss, (stack_t *) 0) < 0)