180 lines
6.9 KiB
C
180 lines
6.9 KiB
C
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//
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// LPC.H Local Remote Procedure Call
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//
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// History:
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// 2/27/94 JosephJ Created.
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//
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//#define NEW_LPC
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#ifdef NEW_LPC
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enum {
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eSRVR_UNREG=0,
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eSRVR_IDLE,
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eSRVR_BUSY
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} SERVER_STATE;
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enum {
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eCALL_NONE=0,
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eCALL_REQUESTED,
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eCALL_PROCESSING,
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eCALL_ABANDONED,
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eCALL_DONE,
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eCALL_DONE_ACK
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} CALL_STATE;
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#define dwSIG_SHARED 0x567D56DBL
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#define dwSIG_SERVER 0x50704B2BL
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#define dwSIG_CLIENT 0xBF9B1A63L
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typedef struct {
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DWORD dwSig; // Must be dwSIG_SHARED above
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DWORD dwClientIDs; // Bitmap of currently bound client IDs;
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DWORD dwSrvrID; // ID of current server.
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DWORD dwSrvrState; // SERVER_STATE enum
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DWORD dwCallState; // CALL_STATE enum
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DWORD dwCallClientID; // ID of client that placed current call.
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DWORD dwDataSize; // Size of following data
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BYTE rgbData[];
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} SHARED_DATA, FAR * LPSHARED_DATA;
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#endif // NEW_LPC
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typedef struct {
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// Service name
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char rgchService[MAX_PATHNAME_SIZE+1];
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// Shared Memory
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HANDLE hMap; // hMap of shared data.
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HANDLE hMtx; // Controls access to the shared data.
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// Created by anyone (thread that
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// created it is responsible for initializing the
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// shared memory it guards).
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// Only the server can grab it for extended periods
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// of time -- precisely when it is processing a call.
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BOOL fGrabbed; // True if mutex grabbed by this process.
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// Events;
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HANDLE hevSrvrFree;// Used to signal to clients that the server is idle.
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// AUTO reset, created non-signalled by anyone.
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HANDLE hevCallAvail;// Used to signal to the server that a call is avilable
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// Manual reset. Created non-signalled by anyone.
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HANDLE hevCallDone; // If Server: event of client that placed current
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// call. Used to signal to the client that it's
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// call is done. It is also used determine if the
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// client is still around by trying to open this
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// named event.
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// If Client: it's event, signalled by server. Created
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// when calling ClientBind.
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// Manual reset. ONE per client. Created nonsignalled
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// by client when doing a ClientBind.
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HANDLE hevCallDoneAck; // Used to signal to the server that the call-done
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// has been picked up by the client.
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// Manual reset. Created non-signalled by anyone.
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#ifdef NEW_LPC
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LPSHARED_DATA lpSharedData; // Pointer to shared data.
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DWORD dwSrvrID; // Server: My ID; Client: Server I last dealt with.
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DWORD dwClientID; // Server: Client I last dealt with. Server: My ID.
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#else // !NEW_LPC
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DWORD dwSharedDataSize;
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LPVOID lpvSharedData;
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// Events
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HANDLE hevSrvcReg;
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enum {eSS_UNDEF=0, eSS_REG, eSS_UNREG} eState;
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#endif // !NEW_LPC
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} SHARED_STATE, FAR * LPSHARED_STATE;
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typedef struct {
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#ifdef NEW_LPC
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DWORD dwSig; // MUST be dwSIG_SERVER above.
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#else // !NEW_LPC
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DWORD dwInstanceID;
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enum {eS_UNINIT=0, eS_INIT} eState;
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#endif // !NEW_LPC
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HANDLE hDummyEvent;
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SHARED_STATE SState;
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} SERVER_LOCAL_STATE, FAR * LPSERVER_LOCAL_STATE;
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typedef struct {
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#ifdef NEW_LPC
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DWORD dwSig; // MUST be dwSIG_CLIENT above.
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#else NEW_LPC
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DWORD dwInstanceID;
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DWORD dwServerInstanceID;
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#endif //!NEW_LPC
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SHARED_STATE SState;
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} CLIENT_LOCAL_STATE, FAR * LPCLIENT_LOCAL_STATE;
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typedef void (FAR *LPFNCALLHANDLER)(DWORD dwID,
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DWORD dwDataSize, LPBYTE lpbData);
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// Server call handling function.
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BOOL ServerRegister(LPSTR lpszService, LPSERVER_LOCAL_STATE);
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// Registers a server. Only one server can be registered for
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// a particular service name.
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// Initializes server_local_state. Returns TRUE on success.
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BOOL ServerUnRegister(LPSERVER_LOCAL_STATE);
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// Unregisters the service. Invalidates data in server_local_state.
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// Returns true on success.
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#ifdef NEW_LPC
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BOOL ClientCheckIfServerPresent(LPSTR lpszService);
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// Returns true iff a server for this service exists. May be called
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// at any time (even before ClientBind). It may be used for the client
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// to determine whether to launch the server.
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// This is not foolproof: for example, the server may exit just after
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// this call returns true, or the server may exist, but be hung.
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#endif // NEW_LPC
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BOOL ClientBind(LPSTR lpszService, DWORD dwTimeout, LPCLIENT_LOCAL_STATE);
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// Binds to the specified service, initializes client_local_state.
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// Returns TRUE on success.
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BOOL ClientUnBind(LPCLIENT_LOCAL_STATE lpClient);
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// Binds from the specified service.
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// Returns TRUE on success.
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BOOL ClientMakeCall(LPCLIENT_LOCAL_STATE, DWORD dwTimeout,
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DWORD dwID, DWORD dwSize, LPBYTE lpbData);
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// Returns only when complete...
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// Copies all data to shared mem, and copies back when
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// done. Never times out. Returns FALSE if there was
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// some problem with the rpc system, or if bad parameters.
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BOOL ClientMakeCallEx(LPSTR lpszService, DWORD dwID, DWORD dwSize, LPBYTE lpbData);
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// Immediate binding version of ClientMakeCall.
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// Returns only when complete...
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// Copies all data to shared mem, and copies back when
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// done. Never times out. Returns FALSE if there was
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// some problem with the rpc system, or if bad parameters.
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BOOL ServerListen(LPSERVER_LOCAL_STATE, LPFNCALLHANDLER, HANDLE hev2, DWORD dwTimeout);
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// Blocks until call received, then
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// calls lpfnCallHandler(id,size,data) once and returns when call is
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// handled. Returns FALSE iff listen timed out. The intension here
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// is for the server to repeatedly call ServerListen. Each time
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// either one call is handled or the function times out.
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// Following functions are for calling only by LibEntry, on process
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// Creation and termination.... When the LPC functionality is moved
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// into a separate DLL, this will migrate into an internal header file.
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void LPCInternalInit(void);
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void LPCInternalDeInit(void);
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