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¶

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.