Create a connection and handle to the specified control device
Synopsis:
#include <sys/asoundlib.h>
int snd_ctl_open( snd_ctl_t **handle,
int card );
Arguments:
- handle
- A pointer to a location in which snd_ctl_open() stores a
handle for the card, which you need to pass to the other
snd_ctl_* functions.
- card
- The card number.
Library:
libasound.so
Use the -l asound option with
qcc
to link against this library.
Description:
The snd_ctl_open() function
creates a new handle and opens a connection to the control interface
for sound card number card (0-N).
This handle may be used in all of the other snd_ctl_*() calls.
Returns:
Zero on success, or a negative value if an error occurs.
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 |