Intel Extensible Firmware Interface - Manual (Page 170)

Extensible Firmware Interface Specification
5-72 12/01/02 Version 1.10
//
// Retrieve the list of all the protocols on each handle
//
Status = gBS->ProtocolsPerHandle (
HandleBuffer[HandleIndex],
&ProtocolGuidArray,
&ArrayCount
);
if (!EFI_ERROR (Status)) {
for (ProtocolIndex = 0; ProtocolIndex < ArrayCount; ProtocolIndex++) {
//
// Retrieve the protocol instance for each protocol
//
Status = gBS->OpenProtocol (
HandleBuffer[HandleIndex],
ProtocolGuidArray[ProtocolIndex],
&Instance,
ImageHandle,
NULL,
EFI_OPEN_PROTOCOL_GET_PROTOCOL
);
//
// Retrieve the list of agents that have opened each protocol
//
Status = gBS->OpenProtocolInformation (
HandleBuffer[HandleIndex],
ProtocolGuidArray[ProtocolIndex],
&OpenInfo,
&OpenInfoCount
);
if (!EFI_ERROR (Status)) {
for (OpenInfoIndex=0;OpenInfoIndex
//
// HandleBuffer[HandleIndex] is the handle
// ProtocolGuidArray[ProtocolIndex] is the protocol GUID
// Instance is the protocol instance for the protocol
// OpenInfo[OpenInfoIndex] is an agent that has opened a protocol
//
}
if (OpenInfo != NULL) {
gBS->FreePool(OpenInfo);
}
}
}
if (ProtocolGuidArray != NULL) {
gBS->FreePool(ProtocolGuidArray);
}
}
}
if (HandleBuffer != NULL) {
gBS->FreePool (HandleBuffer);
}
}