Get the control file descriptor
#include <sys/asoundlib.h> int snd_ctl_file_descriptor( snd_ctl_t *handle );
The snd_ctl_file_descriptor() function returns the file descriptor of the connection to the control interface.
You can use the file descriptor for the select() function (see the QNX Neutrino C Library Reference) for determining if something can be read or written. Your application should then call snd_ctl_read() if data is waiting to be read.
The file descriptor of the connection to the control interface, or a negative value if an error occurs.
QNX Neutrino
Safety: | |
---|---|
Cancellation point | No |
Interrupt handler | No |
Signal handler | Yes |
Thread | Yes |