59 lines
1.8 KiB
C
59 lines
1.8 KiB
C
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/*++
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Copyright (c) 1989 Microsoft Corporation
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Module Name:
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lpclistn.c
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Abstract:
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Local Inter-Process Communication (LPC) connection system services.
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Author:
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Steve Wood (stevewo) 15-May-1989
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--*/
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#include "lpcp.h"
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text(PAGE,NtListenPort)
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#endif
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NTSTATUS NtListenPort (IN HANDLE PortHandle, OUT PPORT_MESSAGE ConnectionRequest)
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/*++
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Routine Description:
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A server thread can listen for connection requests from client threads
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using the NtReplyWaitReceivePort service and looking for an LPC_CONNECTION_REQUEST message type.
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This call will loop, calling the NtReplyWaitReceivePort service, and
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return when it sees a message of type LPC_CONNECTION_REQUEST
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Arguments:
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PortHandle - Specifies the connection port to listen for connection requests to.
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ConnectionRequest - Pointer to a structure that describes the connection request the client is making:
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Return Value:
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NTSTATUS - An appropriate status value
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--*/
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{
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NTSTATUS Status;
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PAGED_CODE();
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// Keep on looping until we get a connection request on the lpc port
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while (TRUE) {
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Status = NtReplyWaitReceivePort( PortHandle, NULL, NULL, ConnectionRequest );
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// We'll return from this procedure if ever we get back non success or the message is a connection request.
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// We still need to protect the testing of ConnectionRequest because it is a user supplied buffer.
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try {
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if ((Status != STATUS_SUCCESS) ||
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((ConnectionRequest->u2.s2.Type & ~LPC_KERNELMODE_MESSAGE) == LPC_CONNECTION_REQUEST)) {
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break;
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}
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} except( EXCEPTION_EXECUTE_HANDLER ) {
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Status = GetExceptionCode();
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break;
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}
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}
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return Status;// And return to our caller
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}
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