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Tcl_OpenTcpClient(3)	    Tcl Library Procedures	  Tcl_OpenTcpClient(3)

______________________________________________________________________________

NAME
       Tcl_OpenTcpClient, Tcl_MakeTcpClientChannel, Tcl_OpenTcpServer - proce‐
       dures to open channels using TCP sockets

SYNOPSIS
       #include <tcl.h>

       Tcl_Channel
       Tcl_OpenTcpClient(interp, port, host, myaddr, myport, async)

       Tcl_Channel
       Tcl_MakeTcpClientChannel(sock)

       Tcl_Channel
       Tcl_OpenTcpServer(interp, port, myaddr, proc, clientData)

ARGUMENTS
       Tcl_Interp *interp (in)			  Tcl interpreter to  use  for
						  error	 reporting.   If  non-
						  NULL and an error occurs, an
						  error message is left in the
						  interpreter's result.

       int port (in)				  A port number to connect  to
						  as  a client or to listen on
						  as a server.

       const char *host (in)			  A string specifying  a  host
						  name	 or  address  for  the
						  remote end  of  the  connec‐
						  tion.

       int myport (in)				  A   port   number   for  the
						  client's end of the  socket.
						  If 0, a port number is allo‐
						  cated at random.

       const char *myaddr (in)			  A string specifying the host
						  name	or address for network
						  interface  to	 use  for  the
						  local end of the connection.
						  If NULL, a default interface
						  is chosen.

       int async (in)				  If   nonzero,	  the	client
						  socket  is  connected	 asyn‐
						  chronously to the server.

       ClientData sock (in)			  Platform-specific handle for
						  client TCP socket.

       Tcl_TcpAcceptProc *proc (in)		  Pointer to  a	 procedure  to
						  invoke  each time a new con‐
						  nection is accepted via  the
						  socket.

       ClientData clientData (in)		  Arbitrary  one-word value to
						  pass to proc.
_________________________________________________________________

DESCRIPTION
       These functions are convenience procedures for creating	channels  that
       communicate  over  TCP  sockets.	  The  operations  on  a  channel  are
       described in the manual entry for Tcl_OpenFileChannel.

TCL_OPENTCPCLIENT
       Tcl_OpenTcpClient opens a client TCP socket connected to a  port	 on  a
       specific	 host,	and  returns a channel that can be used to communicate
       with the server. The host to connect to can be specified	 either	 as  a
       domain  name style name (e.g. www.sunlabs.com), or as a string contain‐
       ing the alphanumeric representation  of	its  four-byte	address	 (e.g.
       127.0.0.1).  Use the string localhost to connect to a TCP socket on the
       host on which the function is invoked.

       The myaddr and myport arguments allow a client to  specify  an  address
       for the local end of the connection.  If myaddr is NULL, then an inter‐
       face is chosen automatically by the operating system.  If myport is  0,
       then a port number is chosen at random by the operating system.

       If  async is zero, the call to Tcl_OpenTcpClient returns only after the
       client socket has either successfully connected to the server,  or  the
       attempted  connection  has  failed.   If async is nonzero the socket is
       connected asynchronously and the returned channel may not yet  be  con‐
       nected to the server when the call to Tcl_OpenTcpClient returns. If the
       channel is in blocking mode and an input or output operation is done on
       the channel before the connection is completed or fails, that operation
       will wait until the connection either completes successfully or	fails.
       If  the	channel	 is in nonblocking mode, the input or output operation
       will return immediately and a subsequent call  to  Tcl_InputBlocked  on
       the channel will return nonzero.

       The  returned  channel  is opened for reading and writing.  If an error
       occurs in  opening  the	socket,	 Tcl_OpenTcpClient  returns  NULL  and
       records a POSIX error code that can be retrieved with Tcl_GetErrno.  In
       addition, if interp is non-NULL, an error message is left in the inter‐
       preter's result.

       The  newly  created  channel  is	 not registered in the supplied inter‐
       preter; to register it, use Tcl_RegisterChannel.	 If one of  the	 stan‐
       dard  channels,	stdin, stdout or stderr was previously closed, the act
       of creating the new channel also assigns it as a	 replacement  for  the
       standard channel.

TCL_MAKETCPCLIENTCHANNEL
       Tcl_MakeTcpClientChannel	 creates  a  Tcl_Channel  around  an existing,
       platform specific, handle for a client TCP socket.

       The newly created channel is not	 registered  in	 the  supplied	inter‐
       preter;	to  register it, use Tcl_RegisterChannel.  If one of the stan‐
       dard channels, stdin, stdout or stderr was previously closed,  the  act
       of  creating  the  new channel also assigns it as a replacement for the
       standard channel.

TCL_OPENTCPSERVER
       Tcl_OpenTcpServer opens a TCP socket on the local host on  a  specified
       port  and  uses the Tcl event mechanism to accept requests from clients
       to connect to it. The myaddr argument specifies the network  interface.
       If  myaddr  is  NULL  the  special address INADDR_ANY should be used to
       allow connections from any network interface.  Each time a client  con‐
       nects  to this socket, Tcl creates a channel for the new connection and
       invokes proc with information about the channel. Proc  must  match  the
       following prototype:
	      typedef void Tcl_TcpAcceptProc(
		      ClientData clientData,
		      Tcl_Channel channel,
		      char *hostName,
		      int port);

       The  clientData argument will be the same as the clientData argument to
       Tcl_OpenTcpServer, channel will be the  handle  for  the	 new  channel,
       hostName points to a string containing the name of the client host mak‐
       ing the connection, and port will contain  the  client's	 port  number.
       The new channel is opened for both input and output.  If proc raises an
       error, the connection is closed	automatically.	 Proc  has  no	return
       value, but if it wishes to reject the connection it can close channel.

       Tcl_OpenTcpServer  normally returns a pointer to a channel representing
       the server socket.  If an error occurs, Tcl_OpenTcpServer returns  NULL
       and records a POSIX error code that can be retrieved with Tcl_GetErrno.
       In addition, if the interpreter is non-NULL, an error message  is  left
       in the interpreter's result.

       The  channel  returned  by  Tcl_OpenTcpServer cannot be used for either
       input or output.	 It is simply a handle for the socket used  to	accept
       connections.   The caller can close the channel to shut down the server
       and disallow further connections from new clients.

       TCP server channels operate correctly only in  applications  that  dis‐
       patch  events  through  Tcl_DoOneEvent  or through Tcl commands such as
       vwait; otherwise Tcl will never notice that a connection request from a
       remote client is pending.

       The  newly  created  channel  is	 not registered in the supplied inter‐
       preter; to register it, use Tcl_RegisterChannel.	 If one of  the	 stan‐
       dard  channels,	stdin, stdout or stderr was previously closed, the act
       of creating the new channel also assigns it as a	 replacement  for  the
       standard channel.

PLATFORM ISSUES
       On  Unix	 platforms,  the  socket  handle  is a Unix file descriptor as
       returned by the socket system  call.   On  the  Windows	platform,  the
       socket handle is a SOCKET as defined in the WinSock API.

SEE ALSO
       Tcl_OpenFileChannel(3), Tcl_RegisterChannel(3), vwait(n)

KEYWORDS
       client, server, TCP

Tcl				      8.0		  Tcl_OpenTcpClient(3)
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