snd_mixer_file_descriptor()
Return the file descriptor of the connection to the sound mixer interface
Synopsis:
#include <sys/asoundlib.h>
int snd_mixer_file_descriptor(
snd_mixer_t *handle );
Arguments:
- handle
- The handle for the mixer device. This must have been created by snd_mixer_open().
Library:
libasound.so
Use the -l asound option with qcc to link against this library.
Description:
The snd_mixer_file_descriptor() function returns the file descriptor of the connection to the sound mixer interface.
You should use this file descriptor with the select() synchronous multiplexer function (see the QNX Neutrino C Library Reference) to receive notification of mixer events. If data is waiting to be read, you can read in the events with snd_mixer_read().
Returns:
The file descriptor of the connection to the mixer interface on success, or a negative error code.
Errors:
- -EINVAL
- Invalid handle argument.
Classification:
QNX Neutrino
| Safety: | |
|---|---|
| Cancellation point | No |
| Interrupt handler | No |
| Signal handler | Yes |
| Thread | Yes |
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