.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later .. c:namespace:: CEC .. _cec-func-open: ********** cec open() ********** Name ==== cec-open - Open a cec device Synopsis ======== .. code-block:: c #include .. c:function:: int open( const char *device_name, int flags ) Arguments ========= ``device_name`` Device to be opened. ``flags`` Open flags. Access mode must be ``O_RDWR``. When the ``O_NONBLOCK`` flag is given, the :ref:`CEC_RECEIVE ` and :ref:`CEC_DQEVENT ` ioctls will return the ``EAGAIN`` error code when no message or event is available, and ioctls :ref:`CEC_TRANSMIT `, :ref:`CEC_ADAP_S_PHYS_ADDR ` and :ref:`CEC_ADAP_S_LOG_ADDRS ` all return 0. Other flags have no effect. Description =========== To open a cec device applications call :c:func:`open()` with the desired device name. The function has no side effects; the device configuration remain unchanged. When the device is opened in read-only mode, attempts to modify its configuration will result in an error, and ``errno`` will be set to EBADF. Return Value ============ :c:func:`open()` returns the new file descriptor on success. On error, -1 is returned, and ``errno`` is set appropriately. Possible error codes include: ``EACCES`` The requested access to the file is not allowed. ``EMFILE`` The process already has the maximum number of files open. ``ENFILE`` The system limit on the total number of open files has been reached. ``ENOMEM`` Insufficient kernel memory was available. ``ENXIO`` No device corresponding to this device special file exists.