IOEventLink
Declaration
class IOEventLink;Overview
IOEventLink allows for fast IPC, suitable for realtime applications.
Applications that open user clients to a DriverKit driver can set up an eventlink for fast signaling.
To configure an eventlink, the application will have to first create an eventlink object with os_eventlink_create() (see <os/eventlink_private.h>). The application then has to extract the remote eventlink port with os_eventlink_extract_remote_port(). To send the remote eventlink port to the driver, use:
const char * name = “Event Link Name”; // This must match the name the driver used in IOEventLink::Create(). kern_return_t ret = IOConnectTrap3(connect, // user client connection (io_connect_t) 0, // specifies event link configuration trap (uintptr_t)name, (uintptr_t)strlen(name), (uintptr_t)remotePort // port from os_eventlink_extract_remote_port );
Once the remote eventlink port has been sent to the driver, the driver should be notified with a user-defined external method or other existing signaling mechanism. The driver should handle this by activating the IOEventLink with Activate().
Topics
Instance Methods
ActivateAssociateCancelDisassociateInvalidateSignalSignalAndWaitSignalAndWaitUntilWaitWaitUntilfreeinit