.. -*- coding: utf-8; mode: rst -*- .. _CA_SET_DESCR: ============ CA_SET_DESCR ============ Name ---- CA_SET_DESCR Synopsis -------- .. c:function:: int ioctl(fd, CA_SET_DESCR, struct ca_descr *desc) :name: CA_SET_DESCR Arguments --------- ``fd`` File descriptor returned by a previous call to :c:func:`open() `. ``msg`` Pointer to struct :c:type:`ca_descr`. .. c:type:: ca_descr .. code-block:: c struct ca_descr { unsigned int index; unsigned int parity; unsigned char cw[8]; }; Description ----------- .. note:: This ioctl is undocumented. Documentation is welcome. Return Value ------------ On success 0 is returned. On error -1 is returned, and the ``errno`` variable is set appropriately. Generic error codes are described at the :ref:`Generic Error Codes ` chapter.