109 lines
2.1 KiB
ReStructuredText
Executable file
109 lines
2.1 KiB
ReStructuredText
Executable file
.. -*- coding: utf-8; mode: rst -*-
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.. _audio_fopen:
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=======================
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Digital TV audio open()
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=======================
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Name
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----
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Digital TV audio open()
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.. attention:: This ioctl is deprecated
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Synopsis
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--------
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.. c:function:: int open(const char *deviceName, int flags)
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:name: dvb-audio-open
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Arguments
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---------
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.. flat-table::
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:header-rows: 0
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:stub-columns: 0
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- .. row 1
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- const char \*deviceName
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- Name of specific audio device.
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- .. row 2
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- int flags
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- A bit-wise OR of the following flags:
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- .. row 3
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-
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- O_RDONLY read-only access
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- .. row 4
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-
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- O_RDWR read/write access
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- .. row 5
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-
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- O_NONBLOCK open in non-blocking mode
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- .. row 6
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-
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- (blocking mode is the default)
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Description
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-----------
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This system call opens a named audio device (e.g.
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/dev/dvb/adapter0/audio0) for subsequent use. When an open() call has
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succeeded, the device will be ready for use. The significance of
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blocking or non-blocking mode is described in the documentation for
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functions where there is a difference. It does not affect the semantics
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of the open() call itself. A device opened in blocking mode can later be
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put into non-blocking mode (and vice versa) using the F_SETFL command
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of the fcntl system call. This is a standard system call, documented in
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the Linux manual page for fcntl. Only one user can open the Audio Device
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in O_RDWR mode. All other attempts to open the device in this mode will
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fail, and an error code will be returned. If the Audio Device is opened
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in O_RDONLY mode, the only ioctl call that can be used is
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AUDIO_GET_STATUS. All other call will return with an error code.
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Return Value
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------------
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.. tabularcolumns:: |p{2.5cm}|p{15.0cm}|
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.. flat-table::
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:header-rows: 0
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:stub-columns: 0
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- .. row 1
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- ``ENODEV``
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- Device driver not loaded/available.
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- .. row 2
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- ``EBUSY``
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- Device or resource busy.
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- .. row 3
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- ``EINVAL``
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- Invalid argument.
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