Modifying Driver Properties
Once an application has located the driver object that it is interested in, it can interact with the driver and the hardware device that it controls. The I/O Kit framework provides two ways to interact with a driver from user space. One method requires the application to open a connection to the driver and then to use that connection to send control requests to the driver and receive status. A connection-based approach is necessary if the driver needs to maintain the state of a client or needs access control to ensure that only one client at a time can access the hardware device. This is discussed later in this chapter.
Another method, which is far simpler, is to allow an application to read and write key/value property ...
Get OS X and iOS Kernel Programming now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
