Return the file descriptor of the connection to the sound mixer interface
#include <sys/asoundlib.h> int snd_mixer_file_descriptor( snd_mixer_t *handle );
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().
The file descriptor of the connection to the mixer interface on success, or a negative error code.
QNX Neutrino
Safety: | |
---|---|
Cancellation point | No |
Interrupt handler | No |
Signal handler | Yes |
Thread | Yes |