2.1. cec open()

2.1.1. Name

cec-open - Open a cec device

2.1.2. Synopsis

#include <fcntl.h>
int open(const char *device_name, int flags)

2.1.3. Arguments

device_name
Device to be opened.
flags

Open flags. Access mode must be O_RDWR.

When the O_NONBLOCK flag is given, the CEC_RECEIVE and CEC_DQEVENT ioctls will return the EAGAIN error code when no message or event is available, and ioctls CEC_TRANSMIT, CEC_ADAP_S_PHYS_ADDR and CEC_ADAP_S_LOG_ADDRS all return 0.

Other flags have no effect.

2.1.4. Description

Note

This documents the proposed CEC API. This API is not yet finalized and is currently only available as a staging kernel module.

To open a cec device applications call open() with the desired device name. The function has no side effects; the device configuration remain unchanged.

When the device is opened in read-only mode, attempts to modify its configuration will result in an error, and errno will be set to EBADF.

2.1.5. Return Value

open() returns the new file descriptor on success. On error, -1 is returned, and errno is set appropriately. Possible error codes include:

EACCES
The requested access to the file is not allowed.
EMFILE
The process already has the maximum number of files open.
ENFILE
The system limit on the total number of open files has been reached.
ENOMEM
Insufficient kernel memory was available.
ENXIO
No device corresponding to this device special file exists.