_ACL_T_ALIGNMENT_BITS
aclp = (acl_t)(((long)entry >> _ACL_T_ALIGNMENT_BITS) << _ACL_T_ALIGNMENT_BITS);
CTASSERT(1 << _ACL_T_ALIGNMENT_BITS > sizeof(struct acl_t_struct));
error = posix_memalign((void *)&acl, 1 << _ACL_T_ALIGNMENT_BITS,