1ntp_time(n) Network Time Facilities ntp_time(n)
2______________________________________________________________________________
6
8 ntp_time - Tcl Time Service Client
9
11 package require Tcl 8.0
12 package require time ?1.2.1?
14 ::time::gettime ?options? timeserver ?port?
16 ::time::getsntp ?options? timeserver ?port?
18 ::time::configure ?options?
20 ::time::cget name
22 ::time::unixtime token
24 ::time::status token
26 ::time::error token
28 ::time::reset token ?reason?
30 ::time::wait token
32 ::time::cleanup token
34_________________________________________________________________
36
38 This package implements a client for the RFC 868 TIME protocol
39 (http://www.rfc-editor.org/rfc/rfc868.txt) and also a minimal client
40 for the RFC 2030 Simple Network Time Protocol (http://www.rfc-edi‐
41 tor.org/rfc/rfc2030.txt). RFC 868 returns the time in seconds since 1
42 January 1900 to either tcp or udp clients. RFC 2030 also gives this
43 time but also provides a fractional part which is not used in this
44 client.
45
47 ::time::gettime ?options? timeserver ?port?
48 Get the time from timeserver. You may specify any of the options
49 listed for the configure command here. This command returns a
50 token which must then be used with the remaining commands in
51 this package. Once you have finished, you should use cleanup to
52 release all resources. The default port is 37.
53 ::time::getsntp ?options? timeserver ?port?
55 Get the time from an SNTP server. This accepts exactly the same
56 arguments as ::time::gettime except that the default port is
57 123. The result is a token as per ::time::gettime and should be
58 handled in the same way.
59 Note that it is unlikely that any SNTP server will reply using
61 tcp so you will require the tcludp or the ceptcl package. If a
62 suitable package can be loaded then the udp protocol will be
63 used by default.
64 ::time::configure ?options?
66 Called with no arguments this command returns all the current
67 configuration options and values. Otherwise it should be called
68 with pairs of option name and value.
69 -protocol number
71 Set the default network protocol. This defaults to udp if
72 the tcludp package is available. Otherwise it will use
73 tcp.
74 -port number
76 Set the default port to use. RFC 868 uses port 37, RFC
77 2030 uses port 123.
78 -timeout number
80 Set the default timeout value in milliseconds. The
81 default is 10 seconds.
82 -command number
84 Set a command procedure to be run when a reply is
85 received. The procedure is called with the time token
86 appended to the argument list.
87 -loglevel number
89 Set the logging level. The default is 'warning'.
90 ::time::cget name
92 Get the current value for the named configuration option.
93 ::time::unixtime token
95 Format the returned time for the unix epoch. RFC 868 time
96 defines time 0 as 1 Jan 1900, while unix time defines time 0 as
97 1 Jan 1970. This command converts the reply to unix time.
98 ::time::status token
100 Returns the status flag. For a successfully completed query this
101 will be ok. May be error or timeout or eof. See also
102 ::time::error
103 ::time::error token
105 Returns the error message provided for requests whose status is
106 error. If there is no error message then an empty string is
107 returned.
108 ::time::reset token ?reason?
110 Reset or cancel the query optionally specfying the reason to
111 record for the error command.
112 ::time::wait token
114 Wait for a query to complete and return the status upon comple‐
115 tion.
116 ::time::cleanup token
118 Remove all state variables associated with the request.
119 % set tok [::time::gettime ntp2a.mcc.ac.uk]
121 % set t [::time::unixtime $tok]
122 % ::time::cleanup $tok
123 % set tok [::time::getsntp pool.ntp.org]
126 % set t [::time::unixtime $tok]
127 % ::time::cleanup $tok
128 proc on_time {token} {
131 if {[time::status $token] eq "ok"} {
132 puts [clock format [time::unixtime $token]]
133 } else {
134 puts [time::error $token]
135 }
136 time::cleanup $token
137 }
138 time::getsntp -command on_time pool.ntp.org
139
142 Pat Thoyts
143
145 This document, and the package it describes, will undoubtedly contain
146 bugs and other problems. Please report such in the category ntp of the
147 Tcllib SF Trackers [http://sourceforge.net/tracker/?group_id=12883].
148 Please also report any ideas for enhancements you may have for either
149 package and/or documentation.
150
152 ntp
153
155 NTP, SNTP, rfc 2030, rfc 868, time
156
158 Copyright (c) 2002, Pat Thoyts <patthoyts@users.sourceforge.net>
159ntp 1.2.1 ntp_time(n)