snd_mixer_open()

Create a connection and handle to a specified mixer device

Synopsis:

#include <sys/asoundlib.h>

int snd_mixer_open( snd_mixer_t **handle, 
                    int card, 
                    int device );

Arguments:

handle
A pointer to a location where snd_mixer_open() stores a handle for the mixer device.
card
The card number.
device
The device number.

Library:

libasound.so

Use the -l asound option to qcc to link against this library.

Description:

The snd_mixer_open() function creates a connection and handle to the mixer device specified by the card and device number. You'll use this handle when calling the other snd_mixer_* functions.

Returns:

Zero on success, or a negative value on error.

Errors:

-EACCES
Search permission is denied on a component of the path prefix, or the device exists and the permissions specified are denied.
-EINTR
The open() operation was interrupted by a signal.
-EMFILE
Too many file descriptors are currently in use by this process.
-ENFILE
Too many files are currently open in the system.
-ENOENT
The named device doesn't exist.
-ENOMEM
No memory available for data structure.
-SND_ERROR_INCOMPATIBLE_VERSION
The audio driver version is incompatible with the client library that the application is using.

Classification:

QNX Neutrino

Safety:
Cancellation point No
Interrupt handler No
Signal handler Yes
Thread Yes