API-MS-Win-Core-IO-L1-1-0

All functions in the API-MS-Win-Core-IO-L1-1-0 set are documented exports from KERNEL32:

• CancelIoEx
• CreateIoCompletionPort
• DeviceIoControl
• GetOverlappedResult
• GetQueuedCompletionStatus
• GetQueuedCompletionStatusEx
• PostQueuedCompletionStatus

For most of these functions, the implementations in KERNEL32 version 6.1 and higher are just stubs which transfer the handling to wherever the schema redirects the API Set. The exceptions are:

• DeviceIoControl, for which the kernel pre-processes the transfer.

New Locations

Non-trivial implementations of all functions in this API Set are exported from KERNELBASE version 6.1 and higher.

Schema Redirection

The Windows 7 schema redirects this API Set to KERNEL32, except that when KERNEL32 itself imports from the API Set, the redirection is to KERNELBASE. Thus:

• high-level executables, which do not use the API Set, continue to import these functions from KERNEL32;
• low-level executables have their imports from the API Set redirected to KERNEL32;
• stub implementations in KERNEL32 import from underlying implementations in KERNELBASE.