/*
     * Only needed for server sockets
     */

    Tcl_TcpAcceptProc *acceptProc;
                                /* Proc to call on accept. */
    void *acceptProcData;  /* The data for the accept proc. */
    void *acceptProcData;	/* The data for the accept proc. */

    /*
     * Only needed for client sockets
     */

    struct addrinfo *addrlist;	/* Addresses to connect to. */
    struct addrinfo *addr;	/* Iterator over addrlist. */

 *	Sets the device into blocking or nonblocking mode.
 *
 * ----------------------------------------------------------------------
 */

static int
TcpBlockModeProc(
    void *instanceData,	/* Socket state. */
    void *instanceData,		/* Socket state. */
    int mode)			/* The mode to set. Can be one of
				 * TCL_MODE_BLOCKING or
				 * TCL_MODE_NONBLOCKING. */
{
    TcpState *statePtr = (TcpState *)instanceData;

    if (mode == TCL_MODE_BLOCKING) {

 *	Reads input from the input device of the channel.
 *
 *----------------------------------------------------------------------
 */

static int
TcpInputProc(
    void *instanceData,	/* Socket state. */
    void *instanceData,		/* Socket state. */
    char *buf,			/* Where to store data read. */
    int bufSize,		/* How much space is available in the
				 * buffer? */
    int *errorCodePtr)		/* Where to store error code. */
{
    TcpState *statePtr = (TcpState *)instanceData;
    int bytesRead;

 *	Writes output on the output device of the channel.
 *
 *----------------------------------------------------------------------
 */

static int
TcpOutputProc(
    void *instanceData,	/* Socket state. */
    void *instanceData,		/* Socket state. */
    const char *buf,		/* The data buffer. */
    int toWrite,		/* How many bytes to write? */
    int *errorCodePtr)		/* Where to store error code. */
{
    TcpState *statePtr = (TcpState *)instanceData;
    int written;

 *	Closes the socket of the channel.
 *
 *----------------------------------------------------------------------
 */

static int
TcpCloseProc(
    void *instanceData,	/* The socket to close. */
    void *instanceData,		/* The socket to close. */
    TCL_UNUSED(Tcl_Interp *))
{
    TcpState *statePtr = (TcpState *)instanceData;
    int errorCode = 0;
    TcpFdList *fds;

    /*

 *	Shuts down one side of the socket.
 *
 *----------------------------------------------------------------------
 */

static int
TcpClose2Proc(
    void *instanceData,	/* The socket to close. */
    void *instanceData,		/* The socket to close. */
    TCL_UNUSED(Tcl_Interp *),
    int flags)			/* Flags that indicate which side to close. */
{
    TcpState *statePtr = (TcpState *)instanceData;
    int readError = 0;
    int writeError = 0;

	newmask = TCL_WRITABLE;
    }
    Tcl_NotifyChannel(statePtr->channel, newmask);
}

static void
TcpWatchProc(
    void *instanceData,	/* The socket state. */
    void *instanceData,		/* The socket state. */
    int mask)			/* Events of interest; an OR-ed combination of
				 * TCL_READABLE, TCL_WRITABLE and
				 * TCL_EXCEPTION. */
{
    TcpState *statePtr = (TcpState *)instanceData;

    if (statePtr->acceptProc != NULL) {

 *	None.
 *
 * ----------------------------------------------------------------------
 */

static int
TcpGetHandleProc(
    void *instanceData,	/* The socket state. */
    void *instanceData,		/* The socket state. */
    TCL_UNUSED(int) /*direction*/,
    void **handlePtr)	/* Where to store the handle. */
    void **handlePtr)		/* Where to store the handle. */
{
    TcpState *statePtr = (TcpState *)instanceData;

    *handlePtr = INT2PTR(statePtr->fds.fd);
    return TCL_OK;
}


 *	attempt has succeeded or failed.
 *
 * ----------------------------------------------------------------------
 */

static void
TcpAsyncCallback(
    void *clientData,	/* The socket state. */
    void *clientData,		/* The socket state. */
    TCL_UNUSED(int) /*mask*/)
{
    TcpConnect(NULL, (TcpState *)clientData);
}

/*
 * ----------------------------------------------------------------------

 *	None.
 *
 *----------------------------------------------------------------------
 */

Tcl_Channel
Tcl_MakeTcpClientChannel(
    void *sock)		/* The socket to wrap up into a channel. */
    void *sock)			/* The socket to wrap up into a channel. */
{
    return (Tcl_Channel) TclpMakeTcpClientChannelMode(sock,
            TCL_READABLE | TCL_WRITABLE);
}

/*
 *----------------------------------------------------------------------

 *	None.
 *
 *----------------------------------------------------------------------
 */

void *
TclpMakeTcpClientChannelMode(
    void *sock,		/* The socket to wrap up into a channel. */
    void *sock,			/* The socket to wrap up into a channel. */
    int mode)			/* OR'ed combination of TCL_READABLE and
				 * TCL_WRITABLE to indicate file mode. */
{
    TcpState *statePtr;
    char channelName[SOCK_CHAN_LENGTH];

    statePtr = (TcpState *)Tcl_Alloc(sizeof(TcpState));

 *	connection acceptance mechanism.
 *
 *----------------------------------------------------------------------
 */

static void
TcpAccept(
    void *data,		/* Callback token. */
    void *data,			/* Callback token. */
    TCL_UNUSED(int) /*mask*/)
{
    TcpFdList *fds = (TcpFdList *)data;	/* Client data of server socket. */
    int newsock;		/* The new client socket */
    TcpState *newSockState;	/* State for new socket. */
    address addr;		/* The remote address */
    socklen_t len;		/* For accept interface */