ntp_time(n) Network Time Facilities ntp_time(n) 







ntp_time - Tcl Time Service Client








package require Tcl 8.0


package require time ?1.2.1?


::time::gettime ?options? timeserver
    ?port?


::time::getsntp ?options? timeserver
    ?port?


::time::configure ?options?


::time::cget name


::time::unixtime token


::time::status token


::time::error token


::time::reset token ?reason?


::time::wait token


::time::cleanup token












This package implements a client for the RFC 868 TIME protocol
    (http://www.rfc-editor.org/rfc/rfc868.txt) and also a minimal client
    for the RFC 2030 Simple Network Time Protocol
    (http://www.rfc-editor.org/rfc/rfc2030.txt). RFC 868 returns the time
    in seconds since 1 January 1900 to either tcp or udp clients. RFC 2030 also
    gives this time but also provides a fractional part which is not used in
    this client.









  
::time::gettime ?options? timeserver
    ?port?

  
Get the time from timeserver. You may specify any of the options
      listed for the configure command here. This command returns a token
      which must then be used with the remaining commands in this package. Once
      you have finished, you should use cleanup to release all resources.
      The default port is 37.

  
::time::getsntp ?options? timeserver
    ?port?

  
Get the time from an SNTP server. This accepts exactly the same arguments
      as ::time::gettime except that the default port is 123. The
      result is a token as per ::time::gettime and should be handled in
      the same way.
    
Note that it is unlikely that any SNTP server will reply using
        tcp so you will require the tcludp or the ceptcl package.
        If a suitable package can be loaded then the udp protocol will be used
        by default.

  

  
::time::configure ?options?

  
Called with no arguments this command returns all the current
      configuration options and values. Otherwise it should be called with pairs
      of option name and value.







  

  
Set the default network protocol. This defaults to udp if the tcludp
      package is available. Otherwise it will use tcp.

  

  
Set the default port to use. RFC 868 uses port 37, RFC 2030 uses
      port 123.

  

  
Set the default timeout value in milliseconds. The default is 10
    seconds.

  

  
Set a command procedure to be run when a reply is received. The procedure
      is called with the time token appended to the argument list.

  

  
Set the logging level. The default is 'warning'.







  
::time::cget name

  
Get the current value for the named configuration option.

  
::time::unixtime token

  
Format the returned time for the unix epoch. RFC 868 time defines time 0
      as 1 Jan 1900, while unix time defines time 0 as 1 Jan 1970. This command
      converts the reply to unix time.

  
::time::status token

  
Returns the status flag. For a successfully completed query this will be
      ok. May be error or timeout or eof. See also
      ::time::error

  
::time::error token

  
Returns the error message provided for requests whose status is
      error. If there is no error message then an empty string is
      returned.

  
::time::reset token ?reason?

  
Reset or cancel the query optionally specfying the reason to record for
      the error command.

  
::time::wait token

  
Wait for a query to complete and return the status upon completion.

  
::time::cleanup token

  
Remove all state variables associated with the request.






% set tok [::time::gettime ntp2a.mcc.ac.uk]
% set t [::time::unixtime $tok]
% ::time::cleanup $tok



% set tok [::time::getsntp pool.ntp.org]
% set t [::time::unixtime $tok]
% ::time::cleanup $tok



proc on_time {token} {
   if {[time::status $token] eq "ok"} {
      puts [clock format [time::unixtime $token]]
   } else {
      puts [time::error $token]
   }
   time::cleanup $token
}
time::getsntp -command on_time pool.ntp.org









Pat Thoyts








This document, and the package it describes, will undoubtedly
    contain bugs and other problems. Please report such in the category
    ntp of the Tcllib SF Trackers
    [http://sourceforge.net/tracker/?group_id=12883]. Please also report any
    ideas for enhancements you may have for either package and/or
  documentation.








ntp








NTP, SNTP, rfc 2030, rfc 868, time








Networking








Copyright (c) 2002, Pat Thoyts <patthoyts@users.sourceforge.net>








  

    1.2.1
    ntp