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 with
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 |