2.3. cec ioctl()¶
cec-ioctl - Control a cec device
This documents the proposed CEC API. This API is not yet finalized and is currently only available as a staging kernel module.
ioctl() function manipulates cec device parameters. The
fd must be an open file descriptor.
request code specifies the cec function to be called. It
has encoded in it whether the argument is an input, output or read/write
parameter, and the size of the argument
argp in bytes.
Macros and structures definitions specifying cec ioctl requests and their parameters are located in the cec.h header file. All cec ioctl requests, their respective function and parameters are specified in Function Reference.
2.3.5. Return Value¶
On success 0 is returned, on error -1 and the
errno variable is set
appropriately. The generic error codes are described at the
Generic Error Codes chapter.
Request-specific error codes are listed in the individual requests descriptions.
When an ioctl that takes an output or read/write parameter fails, the parameter remains unmodified.