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Annotation of 43BSDTahoe/man/man8/timed.8, revision 1.1

1.1     ! root        1: .\" Copyright (c) 1980 Regents of the University of California.
        !             2: .\" All rights reserved.
        !             3: .\"
        !             4: .\" Redistribution and use in source and binary forms are permitted
        !             5: .\" provided that the above copyright notice and this paragraph are
        !             6: .\" duplicated in all such forms and that any documentation,
        !             7: .\" advertising materials, and other materials related to such
        !             8: .\" distribution and use acknowledge that the software was developed
        !             9: .\" by the University of California, Berkeley.  The name of the
        !            10: .\" University may not be used to endorse or promote products derived
        !            11: .\" from this software without specific prior written permission.
        !            12: .\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            13: .\" IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            14: .\" WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            15: .\"
        !            16: .\"    @(#)timed.8     6.3 (Berkeley) 7/9/88
        !            17: .\"
        !            18: .TH TIMED 8 "July 9, 1988"
        !            19: .UC 6
        !            20: .ad
        !            21: .SH NAME
        !            22: timed \- time server daemon
        !            23: .SH SYNOPSIS
        !            24: .B /etc/timed
        !            25: [ -t ] [ -M ] [ -n network ] [ -i network ]
        !            26: .SH DESCRIPTION
        !            27: .I Timed
        !            28: is the time server daemon and is normally invoked
        !            29: at boot time from the
        !            30: .IR rc (8)
        !            31: file.  
        !            32: It synchronizes the host's time with the time of other
        !            33: machines in a local area network running 
        !            34: .IR timed (8).
        !            35: These time servers will slow down the clocks of some machines
        !            36: and speed up the clocks of others to bring them to the average network time.
        !            37: The average network time is computed from measurements of clock differences
        !            38: using the ICMP timestamp request message.
        !            39: .PP
        !            40: The service provided by \fItimed\fP is based  on a master-slave
        !            41: scheme.
        !            42: When
        !            43: .IR timed (8)
        !            44: is started on a machine, it asks the master for the network time
        !            45: and sets the host's clock to that time.
        !            46: After that, it accepts synchronization messages periodically sent by
        !            47: the master and calls 
        !            48: .IR adjtime (2)
        !            49: to perform the needed corrections on the host's clock.
        !            50: .PP
        !            51: It also communicates with
        !            52: .IR date (1)
        !            53: in order to set the date globally,
        !            54: and with 
        !            55: .IR timedc (8),
        !            56: a timed control program.
        !            57: If the machine running the master crashes, then the slaves will elect
        !            58: a new master from among slaves running with the 
        !            59: .B \-M
        !            60: flag.
        !            61: A
        !            62: .IR timed
        !            63: running without the
        !            64: .B \-M
        !            65: flag will remain a slave.
        !            66: The 
        !            67: .B \-t 
        !            68: flag enables \fItimed\fP to trace the messages it receives in the
        !            69: file /usr/adm/timed.log.
        !            70: Tracing can be turned on or off by the program
        !            71: .IR timedc (8).
        !            72: .I Timed
        !            73: normally checks for a master time server on each network to which
        !            74: it is connected, except as modified by the options described below.
        !            75: It will request synchronization service from the first master server
        !            76: located.
        !            77: If permitted by the
        !            78: .B \-M
        !            79: flag, it will provide synchronization service on any attached networks
        !            80: on which no current master server was detected.
        !            81: Such a server propagates the time computed by the top-level master.
        !            82: The 
        !            83: .B \-n 
        !            84: flag, followed by the name of a network which the host is connected to
        !            85: (see
        !            86: .IR networks (5)),
        !            87: overrides the default choice of the
        !            88: network addresses made by the program.
        !            89: Each time the
        !            90: .B \-n
        !            91: flag appears, that network name is added to a list of valid networks.
        !            92: All other networks are ignored.
        !            93: The 
        !            94: .B \-i 
        !            95: flag, followed by the name of a network to which the host is connected
        !            96: (see
        !            97: .IR networks (5)),
        !            98: overrides the default choice of the network addresses made by the program.
        !            99: Each time the
        !           100: .B \-i
        !           101: flag appears, that network name is added to a list of networks to ignore.
        !           102: All other networks are used by the time daemon.
        !           103: The
        !           104: .B \-n
        !           105: and 
        !           106: .B \-i
        !           107: flags are meaningless if used together.
        !           108: .SH FILES
        !           109: .nf
        !           110: .ta \w'/usr/adm/timed.masterlog     'u
        !           111: /usr/adm/timed.log             tracing file for timed
        !           112: /usr/adm/timed.masterlog       log file for master timed 
        !           113: .fi
        !           114: .SH "SEE ALSO"
        !           115: date(1), adjtime(2), gettimeofday(2), icmp(4P), timedc(8),
        !           116: .br
        !           117: \fITSP: The Time Synchronization Protocol for UNIX 4.3BSD\fP, 
        !           118: R. Gusella and S. Zatti

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