Intel Extensible Firmware Interface - Manual (Page 157)

Services — Boot Services
Version 1.10 12/01/02 5-59
OpenProtocolInformation()
Summary
Retrieves the list of agents that currently have a protocol interface opened.
Prototype
typedef
EFI_STATUS
(EFIAPI *EFI_OPEN_PROTOCOL_INFORMATION) (
IN EFI_HANDLE Handle,
IN EFI_GUID *Protocol,
OUT EFI_OPEN_PROTOCOL_INFORMATION_ENTRY **EntryBuffer,
OUT UINTN *EntryCount
);
Parameters
Handle The handle for the protocol interface that is being queried.
Protocol The published unique identifier of the protocol. It is the callers
responsibility to pass in a valid GUID. See “Wired For
Management Baseline” for a description of valid GUID values.
EntryBuffer A pointer to a buffer of open protocol information in the form of
EFI_OPEN_PROTOCOL_INFORMATION_ENTRY structures.
See "Related Definitions" for the declaration of this type. The
buffer is allocated by this service, and it is the caller's
responsibility to free this buffer when the caller no longer
requires the buffer's contents.
EntryCount A pointer to the number of entries in EntryBuffer .
Related Definitions
typedef struct {
EFI_HANDLE AgentHandle;
EFI_HANDLE ControllerHandle;
UINT32 Attributes;
UINT32 OpenCount;
} EFI_OPEN_PROTOCOL_INFORMATION_ENTRY;