IOKit.framework | |
Public Framework | |
---|---|
Availabile | 1.0 – present |
Class Prefix | IO, OS |
Headers | [headers.cynder.me] |
I/O Kit is a low-level framework communicating with hardware or kernel services. Although it is a public framework, Apple discourages anyone using it, and will be rejected from AppStore.
IOService
Code using I/O Kit usually follows this pattern:
// Get the service named "AppleNANDFTL".
CFMutableDictionaryRef matching = IOServiceMatching("AppleNANDFTL");
io_service_t service = IOServiceGetMatchingService(kIOMasterPortDefault, matching);
// Open a connection to the AppleNANDFTL service
io_connect_t connect;
kern_return_t errcode = IOServiceOpen(service, mach_task_self(), 0, &connect);
// Send some message to the service and get the result.
// using one of the IOConnectCall*** methods.
if (errcode == 0) {
size_t infoSize;
size_t osize = sizeof(infoSize);
errcode = IOConnectCallStructMethod(
connect, 0xFE000200, // selector
NULL, 0, // input
&infoSize, &osize); // output
if (errcode == 0) {
void* info = malloc(infoSize);
IOConnectCallStructMethod(connect, 0xFE000100, NULL, 0, info, &infoSize);
// do_something_with(info);
free(info);
}
IOServiceClose(connect);
}
IOObjectRelease(service);
The selectors and input/output depends on the service.
Non-IOService
Besides IOService functions, the user-land I/O Kit also contains other hardware and kernel-related functions, e.g. IOHID (human interface device), OSKext (kernel extension), etc.
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