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    Command:

    udp

    
    
    

    SYNOPSIS

           package require Tcl  8.2
    
           package require udp  1.0
    
           udp_open ?port?
    
           udp_conf sock host port
    
           udp_conf  sock  ?-myport?  ?-remote?  ?-peer?  ?-broadcast  bool? ?-ttl
           count?
    
           udp_conf ?-mcastadd groupaddr?
    
           udp_conf ?-mcastdrop groupaddr?
    
           udp_peek sock ?buffersize?
    
    
    

    DESCRIPTION

           This package provides support for using UDP through  Tcl.  The  package
           provides  a  new  channel type and attempts to permit the use of packet
           oriented UDP over stream oriented Tcl  channels.  The  package  defined
           three  commands but udp_conf should be considered depreciated in favour
           of the standard Tcl command fconfigure.
    
    
    

    COMMANDS

           udp_open ?port?
                  udp_open will open a UDP socket. If port is  specified  the  UDP
                  socket  will  be  opened on that port. Otherwise the system will
                  choose a port and the user  can  use  the  udp_conf  command  to
                  obtain the port number if required.
    
           udp_conf sock host port
                  udp_conf  in  this  configuration  is used to specify the remote
                  destination for packets written to this sock. You must call this
                  command before writing data to the UDP socket.
    
           udp_conf  sock  ?-myport?  ?-remote?  ?-peer?  ?-broadcast  bool? ?-ttl
           count?
                  In  addition  to  being  used  to configure the remote host, the
                  udp_conf command is used to obtain  information  about  the  UDP
                  socket.
    
                  -myport
                         Returns the local port number of the socket.
    
                  -remote
                         Returns  the remote hostname and port number as set using
                         udp_conf sock host port.
    
                  -peer  Returns the remote  hostname  and  port  number  for  the
                         packet  to  the  local  subnet. To permit packets to pass
                         routers, you must increase the ttl. A value of 31  should
                         keep it within a site, while 255 is global.
    
           udp_conf ?-mcastadd groupaddr?
    
           udp_conf ?-mcastdrop groupaddr?
                  tcludp sockets can support IPv4 multicast operations. To recieve
                  multicast packets the application has to  notify  the  operating
                  system  that  it should join a particular multicast group. These
                  are  specified  as  addresses  in   the   range   224.0.0.0   to
                  239.255.255.255.
    
           udp_peek sock ?buffersize?
                  Examine  a  packet  without  removing  it from the buffer.  This
                  function is not available on windows.
    
    
    

    EXAMPLES

           # Send data to a remote UDP socket
           proc udp_puts {host port} {
               set s [udp_open]
               fconfigure $s -remote [list $host $port]
               puts $s "Hello, World"
               close $f
           }
    
           # A simple UDP server
           package require udp
    
           proc udpEventHandler {sock} {
               set pkt [read $sock]
               set peer [fconfigure $sock -peer]
               puts "$peer: [string length $pkt] {$pkt}"
               return
           }
    
           proc udp_listen {port} {
               set srv [udp_open $port]
               fconfigure $srv -buffering none -translation binary
               fileevent $srv readable [list ::udpEventHandler $srv]
               puts "Listening on udp port: [fconfigure $srv -myport]"
               return $srv
           }
    
           set sock [udp_listen 53530]
           vwait forever
           close $sock
    
           # A multicast demo.
           fconfigure $s -buffering none -blocking 0
           fconfigure $s -mcastadd $group -remote [list $group $port]
           fileevent $s readable [list udpEvent $s]
           puts -nonewline $s "hello, world"
           set ::forever 0
           vwait ::forever
           exit
    
    
    

    HISTORY

           Some of the code in this extension  is  copied  from  Michael  Miller's
           tcludp                                                         package.
           (http://www.neosoft.com/tcl/ftparchive/sorted/comm/tcludp-1.0/)    Com-
           pared  with  Michael's  UDP  extension, this extension provides Windows
           support and provides the ability of using 'gets/puts' to read/write the
           socket. In addition, it provides more configuration ability.
    
           Enhancements  to  support  binary data and to setup the package for the
           Tcl Extension Architecture by Pat Thoyts.
    
    
    

    SEE ALSO

           socket(3tcl)
    
    
    

    KEYWORDS

           networking, socket, udp
    
    
    

    COPYRIGHT

           Copyright (c) 1999-2000 Columbia University; all rights reserved
    
    
    

    udp 1.0.8 udp(3tcl)

    
    
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