control_io_channel — Perform an action on I/O channels.
control_io_channel performs an action on the specified I/O channels. The supported parameters are interface-specific and listed in the corresponding documentation of the used I/O interface that can be found in the directory 'doc/html/reference/io'.
Handles of the opened I/O channels.
Name of the action to perform.
List of arguments for the action.
Default value: 
List of values returned by the action.
If the parameters are valid, the operator control_io_channel returns the value 2 (H_MSG_TRUE). If necessary an exception is raised. In this case an extended error information may be set and can be queried with the operator get_extended_error_info.