krb5_rc_io_write
if ((krb5_rc_io_write(context, &t->d,
ret = krb5_rc_io_write(context, &t->d, buf, len);
retval = krb5_rc_io_write(context, d, (krb5_pointer)&rc_vno,
krb5_error_code krb5_rc_io_write