.. 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 <gen-errors> chapter.