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snd_ctl_open()

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.a

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

See also:

snd_ctl_close()

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