.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later .. c:namespace:: DTV.ca .. _ca_fopen: ==================== Digital TV CA open() ==================== Name ---- Digital TV CA open() Synopsis -------- .. c:function:: int open(const char *name, int flags) Arguments --------- ``name`` Name of specific Digital TV CA device. ``flags`` A bit-wise OR of the following flags: .. tabularcolumns:: |p{2.5cm}|p{15.0cm}| .. flat-table:: :header-rows: 0 :stub-columns: 0 :widths: 1 16 - - ``O_RDONLY`` - read-only access - - ``O_RDWR`` - read/write access - - ``O_NONBLOCK`` - open in non-blocking mode (blocking mode is the default) Description ----------- This system call opens a named ca device (e.g. ``/dev/dvb/adapter?/ca?``) for subsequent use. When an ``open()`` call has succeeded, the device will be ready for use. The significance of blocking or non-blocking mode is described in the documentation for functions where there is a difference. It does not affect the semantics of the ``open()`` call itself. A device opened in blocking mode can later be put into non-blocking mode (and vice versa) using the ``F_SETFL`` command of the ``fcntl`` system call. This is a standard system call, documented in the Linux manual page for fcntl. Only one user can open the CA Device in ``O_RDWR`` mode. All other attempts to open the device in this mode will fail, and an error code will be returned. 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.