| .. -*- coding: utf-8; mode: rst -*- |
| |
| .. _audio_fopen: |
| |
| ================ |
| DVB audio open() |
| ================ |
| |
| NAME |
| ---- |
| |
| DVB audio open() |
| |
| SYNOPSIS |
| -------- |
| |
| .. c:function:: int open(const char *deviceName, int flags) |
| |
| |
| ARGUMENTS |
| --------- |
| |
| .. flat-table:: |
| :header-rows: 0 |
| :stub-columns: 0 |
| |
| |
| - .. row 1 |
| |
| - const char \*deviceName |
| |
| - Name of specific audio device. |
| |
| - .. row 2 |
| |
| - int flags |
| |
| - A bit-wise OR of the following flags: |
| |
| - .. row 3 |
| |
| - |
| - O_RDONLY read-only access |
| |
| - .. row 4 |
| |
| - |
| - O_RDWR read/write access |
| |
| - .. row 5 |
| |
| - |
| - O_NONBLOCK open in non-blocking mode |
| |
| - .. row 6 |
| |
| - |
| - (blocking mode is the default) |
| |
| |
| DESCRIPTION |
| ----------- |
| |
| This system call opens a named audio device (e.g. |
| /dev/dvb/adapter0/audio0) 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 Audio Device |
| in O_RDWR mode. All other attempts to open the device in this mode will |
| fail, and an error code will be returned. If the Audio Device is opened |
| in O_RDONLY mode, the only ioctl call that can be used is |
| AUDIO_GET_STATUS. All other call will return with an error code. |
| |
| |
| RETURN VALUE |
| ------------ |
| |
| .. flat-table:: |
| :header-rows: 0 |
| :stub-columns: 0 |
| |
| |
| - .. row 1 |
| |
| - ``ENODEV`` |
| |
| - Device driver not loaded/available. |
| |
| - .. row 2 |
| |
| - ``EBUSY`` |
| |
| - Device or resource busy. |
| |
| - .. row 3 |
| |
| - ``EINVAL`` |
| |
| - Invalid argument. |