TcpClose2Proc(
    ClientData instanceData,	/* The socket to close. */
    Tcl_Interp *interp,		/* For error reporting. */
    int flags)			/* Flags that indicate which side to close. */
{
    TcpState *statePtr = instanceData;
    int errorCode = 0;
    int sd;

    /*
     * Shutdown the OS socket handle.
     */

    switch(flags) {
    case TCL_CLOSE_READ:
	sd = SD_RECEIVE;
	break;
    case TCL_CLOSE_WRITE:
    if ((flags & (TCL_CLOSE_READ|TCL_CLOSE_WRITE)) == 0) {
	sd = SD_SEND;
	break;
    default:
	if (interp) {
	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
		    "socket close2proc called bidirectionally", -1));
	}
	return TCL_ERROR;
	return TcpCloseProc(instanceData, interp);
    }

    /* single fd operation: Tcl_OpenTcpServer() does not set TCL_READABLE or
     * TCL_WRITABLE so this should never be called for a server socket. */
    if (shutdown(statePtr->sockets->fd, sd) == SOCKET_ERROR) {
    if ((flags & TCL_CLOSE_READ) && (shutdown(statePtr->sockets->fd, SD_RECEIVE) == SOCKET_ERROR)) {
	TclWinConvertError((DWORD) WSAGetLastError());
	errorCode = Tcl_GetErrno();
    }
    if ((flags & TCL_CLOSE_WRITE) && (shutdown(statePtr->sockets->fd, SD_SEND) == SOCKET_ERROR) && (errorCode != 0)) {
	TclWinConvertError((DWORD) WSAGetLastError());
	errorCode = Tcl_GetErrno();
    }

    return errorCode;
}

/*
 *----------------------------------------------------------------------
 *
 * TcpSetOptionProc --