_krb5_uio
struct _krb5_uio uio_a = { 0, KRB5_UIO_GETRESPONSE, "Password 1: " };
struct _krb5_uio uio_b = { 0, KRB5_UIO_GETRESPONSE |
struct _krb5_uio uio_c = { 0, KRB5_UIO_GETRESPONSE, "Password 3: " };
struct _krb5_uio *next;