4.4BSD-Lite2
This commit is contained in:
mrg
parent
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commit
5cf6badca2
53
usr.sbin/timed/SMM.doc/timed/date
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53
usr.sbin/timed/SMM.doc/timed/date
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.\" Copyright (c) 1986, 1993
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||||||
|
.\" The Regents of the University of California. All rights reserved.
|
||||||
|
.\"
|
||||||
|
.\" Redistribution and use in source and binary forms, with or without
|
||||||
|
.\" modification, are permitted provided that the following conditions
|
||||||
|
.\" are met:
|
||||||
|
.\" 1. Redistributions of source code must retain the above copyright
|
||||||
|
.\" notice, this list of conditions and the following disclaimer.
|
||||||
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
||||||
|
.\" notice, this list of conditions and the following disclaimer in the
|
||||||
|
.\" documentation and/or other materials provided with the distribution.
|
||||||
|
.\" 3. All advertising materials mentioning features or use of this software
|
||||||
|
.\" must display the following acknowledgement:
|
||||||
|
.\" This product includes software developed by the University of
|
||||||
|
.\" California, Berkeley and its contributors.
|
||||||
|
.\" 4. Neither the name of the University nor the names of its contributors
|
||||||
|
.\" may be used to endorse or promote products derived from this software
|
||||||
|
.\" without specific prior written permission.
|
||||||
|
.\"
|
||||||
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
||||||
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||||||
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||||||
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
||||||
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||||||
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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||||||
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||||
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
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|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||||||
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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|
.\" SUCH DAMAGE.
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|
.\"
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.\" @(#)date 8.1 (Berkeley) 6/8/93
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.\"
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.ft B
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.TS
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|
center;
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ce | ce | ce | ce
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| c | c | c | s |
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| c s s s |.
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Byte 1 Byte 2 Byte 3 Byte 4
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=
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Type Version No. Sequence No.
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_
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Seconds of Time to Set
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_
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Microseconds of Time to Set
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_
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Machine Name
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_
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\&. . .
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_
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.TE
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.ft R
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54
usr.sbin/timed/SMM.doc/timed/loop
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54
usr.sbin/timed/SMM.doc/timed/loop
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@ -0,0 +1,54 @@
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.\" Copyright (c) 1986, 1993
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.\" The Regents of the University of California. All rights reserved.
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|
.\"
|
||||||
|
.\" Redistribution and use in source and binary forms, with or without
|
||||||
|
.\" modification, are permitted provided that the following conditions
|
||||||
|
.\" are met:
|
||||||
|
.\" 1. Redistributions of source code must retain the above copyright
|
||||||
|
.\" notice, this list of conditions and the following disclaimer.
|
||||||
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
||||||
|
.\" notice, this list of conditions and the following disclaimer in the
|
||||||
|
.\" documentation and/or other materials provided with the distribution.
|
||||||
|
.\" 3. All advertising materials mentioning features or use of this software
|
||||||
|
.\" must display the following acknowledgement:
|
||||||
|
.\" This product includes software developed by the University of
|
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|
.\" California, Berkeley and its contributors.
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||||||
|
.\" 4. Neither the name of the University nor the names of its contributors
|
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|
.\" may be used to endorse or promote products derived from this software
|
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|
.\" without specific prior written permission.
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||||||
|
.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||||||
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
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|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
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|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||||||
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
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|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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|
.\" SUCH DAMAGE.
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.\"
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.\" @(#)loop 8.1 (Berkeley) 6/8/93
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.\"
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.ft B
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|
.TS
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|
center;
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|
ce | ce | ce | ce
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| c | c | c | s |
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|
| c | c s s |
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| c s s s |.
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Byte 1 Byte 2 Byte 3 Byte 4
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=
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Type Version No. Sequence No.
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_
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|
Hop Count ( unused )
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|
_
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( unused )
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_
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Machine Name
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_
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\&. . .
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_
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.TE
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.ft R
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34
usr.sbin/timed/SMM.doc/timed/spell.ok
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34
usr.sbin/timed/SMM.doc/timed/spell.ok
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ACK
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ADJTIME
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Adjtime
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CS
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CSELT
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|
Candidature
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|
DATEACK
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|
DoD
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|
Gusella
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MASTERACK
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MASTERREQ
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MASTERUP
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MSITE
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MSITEREQ
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Protocol''SMM:22
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Riccardo
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SETDATE
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SETDATEREQ
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SETTIME
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SLAVEUP
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SMM:22
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|
Stefano
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TRACEOFF
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|
TRACEON
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TSP
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Timedc
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UDP
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|
USENIX
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|
Zatti
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|
candidature
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|
ce
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|
daemon
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|
daemons
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timedc
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53
usr.sbin/timed/SMM.doc/timed/time
Normal file
53
usr.sbin/timed/SMM.doc/timed/time
Normal file
@ -0,0 +1,53 @@
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.\" Copyright (c) 1986, 1993
|
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|
.\" The Regents of the University of California. All rights reserved.
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|
.\"
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||||||
|
.\" Redistribution and use in source and binary forms, with or without
|
||||||
|
.\" modification, are permitted provided that the following conditions
|
||||||
|
.\" are met:
|
||||||
|
.\" 1. Redistributions of source code must retain the above copyright
|
||||||
|
.\" notice, this list of conditions and the following disclaimer.
|
||||||
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
||||||
|
.\" notice, this list of conditions and the following disclaimer in the
|
||||||
|
.\" documentation and/or other materials provided with the distribution.
|
||||||
|
.\" 3. All advertising materials mentioning features or use of this software
|
||||||
|
.\" must display the following acknowledgement:
|
||||||
|
.\" This product includes software developed by the University of
|
||||||
|
.\" California, Berkeley and its contributors.
|
||||||
|
.\" 4. Neither the name of the University nor the names of its contributors
|
||||||
|
.\" may be used to endorse or promote products derived from this software
|
||||||
|
.\" without specific prior written permission.
|
||||||
|
.\"
|
||||||
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
||||||
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||||||
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||||||
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
||||||
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||||||
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||||||
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||||
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||||
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||||||
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
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|
.\" SUCH DAMAGE.
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|
.\"
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|
.\" @(#)time 8.1 (Berkeley) 6/8/93
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|
.\"
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.ft B
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|
.TS
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|
center;
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|
ce | ce | ce | ce
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|
| c | c | c | s |
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|
| c s s s |.
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|
Byte 1 Byte 2 Byte 3 Byte 4
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=
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|
Type Version No. Sequence No.
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|
_
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|
Seconds of Adjustment
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|
_
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|
Microseconds of Adjustment
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|
_
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|
Machine Name
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|
_
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\&. . .
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|
_
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.TE
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|
.ft R
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504
usr.sbin/timed/SMM.doc/timed/timed.ms
Normal file
504
usr.sbin/timed/SMM.doc/timed/timed.ms
Normal file
@ -0,0 +1,504 @@
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|
.\" Copyright (c) 1986, 1993
|
||||||
|
.\" The Regents of the University of California. All rights reserved.
|
||||||
|
.\"
|
||||||
|
.\" Redistribution and use in source and binary forms, with or without
|
||||||
|
.\" modification, are permitted provided that the following conditions
|
||||||
|
.\" are met:
|
||||||
|
.\" 1. Redistributions of source code must retain the above copyright
|
||||||
|
.\" notice, this list of conditions and the following disclaimer.
|
||||||
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
||||||
|
.\" notice, this list of conditions and the following disclaimer in the
|
||||||
|
.\" documentation and/or other materials provided with the distribution.
|
||||||
|
.\" 3. All advertising materials mentioning features or use of this software
|
||||||
|
.\" must display the following acknowledgement:
|
||||||
|
.\" This product includes software developed by the University of
|
||||||
|
.\" California, Berkeley and its contributors.
|
||||||
|
.\" 4. Neither the name of the University nor the names of its contributors
|
||||||
|
.\" may be used to endorse or promote products derived from this software
|
||||||
|
.\" without specific prior written permission.
|
||||||
|
.\"
|
||||||
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
||||||
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||||||
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||||||
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
||||||
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||||||
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||||||
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||||
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||||
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||||||
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
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|
.\" SUCH DAMAGE.
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|
.\"
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.\" @(#)timed.ms 8.1 (Berkeley) 6/8/93
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.\"
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.TL
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The Berkeley
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.UX
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.br
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Time Synchronization Protocol
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.AU
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|
Riccardo Gusella, Stefano Zatti, and James M. Bloom
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.AI
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|
Computer Systems Research Group
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Computer Science Division
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Department of Electrical Engineering and Computer Science
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University of California, Berkeley
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Berkeley, CA 94720
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.FS
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|
This work was sponsored by the Defense Advanced Research Projects Agency
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(DoD), monitored by the Naval Electronics Systems
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|
Command under contract No. N00039-84-C-0089, and by the Italian CSELT
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Corporation.
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|
The views and conclusions contained in this document are those of the
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|
authors and should not be interpreted as representing official policies,
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|
either expressed or implied, of the Defense Research Projects Agency,
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|
of the US Government, or of CSELT.
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.FE
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|
.LP
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|
.OH 'The Berkeley UNIX Time Synchronization Protocol''SMM:12-%'
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.EH 'SMM:12-%''The Berkeley UNIX Time Synchronization Protocol'
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|
.SH
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|
Introduction
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.PP
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|
The Time Synchronization Protocol (TSP)
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|
has been designed for specific use by the program \fItimed\fP,
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|
a local area network clock synchronizer for
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the UNIX 4.3BSD operating
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system.
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|
Timed is built on the DARPA UDP protocol [4] and
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|
is based on a master slave scheme.
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.PP
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|
TSP serves a dual purpose.
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|
First, it supports messages for the synchronization of the clocks
|
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|
of the various hosts in a local area network.
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|
Second, it supports messages for the election that occurs
|
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|
among slave time daemons when, for any reason, the master disappears.
|
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|
The synchronization mechanism and the election procedure
|
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|
employed by the program timed are described
|
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|
in other documents [1,2,3].
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|
.PP
|
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|
Briefly, the synchronization software, which works in a
|
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|
local area network, consists of a collection of \fItime daemons\fP
|
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|
(one per machine) and is based on a master-slave
|
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|
structure.
|
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|
The present implementation keeps processor clocks synchronized
|
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|
within 20 milliseconds.
|
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|
A \fImaster time daemon\fP measures the time
|
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|
difference between the clock of the machine on which it
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|
is running and those of all other machines. The current implementation
|
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|
uses ICMP \fITime Stamp Requests\fP [5] to measure the clock difference
|
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|
between machines.
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|
The master computes the \fInetwork time\fP as the average of the
|
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|
times provided by nonfaulty clocks.\**
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|
.FS
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|
A clock is considered to be faulty when its value
|
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|
is more than a small specified
|
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|
interval apart from the majority of the clocks
|
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|
of the machines on the same network.
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|
See [1,2] for more details.
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|
.FE
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|
It then sends to each \fIslave time daemon\fP the
|
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|
correction that should be performed on the clock of its machine.
|
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|
This process is repeated periodically.
|
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|
Since the correction is expressed as a time difference rather than an
|
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|
absolute time, transmission delays do not interfere with synchronization.
|
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|
When a machine comes up and joins the network,
|
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|
it starts a slave time daemon, which
|
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|
will ask the master for the correct time and will reset the machine's clock
|
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|
before any user activity can begin.
|
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|
The time daemons therefore maintain a single network time in spite of
|
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|
the drift of clocks away from each other.
|
||||||
|
.PP
|
||||||
|
Additionally, a time daemon on gateway machines may run as
|
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|
a \fIsubmaster\fP.
|
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|
A submaster time daemon functions as a slave on one network that
|
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|
already has a master and as master on other networks.
|
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|
In addition, a submaster is responsible for propagating broadcast
|
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|
packets from one network to the other.
|
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|
.PP
|
||||||
|
To ensure that service provided is continuous and reliable,
|
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|
it is necessary to implement an election algorithm that will elect a
|
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|
new master should the machine running the current master crash, the master
|
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|
terminate (for example, because of a run-time error), or the network be
|
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|
partitioned.
|
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|
Under our algorithm, slaves are able to realize when the master has
|
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|
stopped functioning and to elect a new master from among themselves.
|
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|
It is important to note that since the failure of the master results
|
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|
only in a gradual divergence of clock values, the election
|
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|
need not occur immediately.
|
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|
.PP
|
||||||
|
All the communication occurring among time daemons uses the TSP
|
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|
protocol.
|
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|
While some messages need not be sent in a reliable way,
|
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|
most communication in TSP requires reliability not provided by the underlying
|
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|
protocol.
|
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|
Reliability is achieved by the use of acknowledgements, sequence numbers, and
|
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|
retransmission when message losses occur.
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|
When a message that requires acknowledgment is not acknowledged after
|
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|
multiple attempts,
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|
the time daemon that has sent the message will assume that the
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|
addressee is down.
|
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|
This document will not describe the details of how reliability is
|
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|
implemented, but will only point out when
|
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|
a message type requires a reliable transport mechanism.
|
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|
.PP
|
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|
The message format in TSP is the same for all message types;
|
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|
however, in some instances, one or more fields are not used.
|
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|
The next section describes the message format.
|
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|
The following sections describe
|
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|
in detail the different message types, their use and the contents
|
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|
of each field. NOTE: The message format is likely to change in
|
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|
future versions of timed.
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|
.sp 2
|
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|
.SH
|
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|
Message Format
|
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|
.PP
|
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|
All fields are based upon 8-bit bytes. Fields should be sent in
|
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|
network byte order if they are more than one byte long.
|
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|
The structure of a TSP message is the following:
|
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|
.IP 1)
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|
A one byte message type.
|
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|
.IP 2)
|
||||||
|
A one byte version number, specifying the protocol version which the
|
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|
message uses.
|
||||||
|
.IP 3)
|
||||||
|
A two byte sequence number to be used for recognizing duplicate messages
|
||||||
|
that occur when messages are retransmitted.
|
||||||
|
.IP 4)
|
||||||
|
Eight bytes of packet specific data. This field contains two 4 byte time
|
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|
values, a one byte hop count, or may be unused depending on the type
|
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|
of the packet.
|
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|
.IP 5)
|
||||||
|
A zero-terminated string of up to 256 \s-2ASCII\s+2 characters with the name of
|
||||||
|
the machine sending the message.
|
||||||
|
.PP
|
||||||
|
The following charts describe the message types,
|
||||||
|
show their fields, and explain their usages.
|
||||||
|
For the purpose of the following discussion, a time daemon can
|
||||||
|
be considered to be in
|
||||||
|
one of three states: slave, master, or candidate for election to master.
|
||||||
|
Also, the term \fIbroadcast\fP refers to
|
||||||
|
the sending of a message to all active time daemons.
|
||||||
|
.sp 1
|
||||||
|
.DS L
|
||||||
|
.SH
|
||||||
|
Adjtime Message
|
||||||
|
.so time
|
||||||
|
.LP
|
||||||
|
Type: TSP_ADJTIME (1)
|
||||||
|
.sp 1
|
||||||
|
.PP
|
||||||
|
The master sends this message to a slave to communicate
|
||||||
|
the difference between
|
||||||
|
the clock of the slave and
|
||||||
|
the network time the master has just computed.
|
||||||
|
The slave will accordingly
|
||||||
|
adjust the time of its machine.
|
||||||
|
This message requires an acknowledgment.
|
||||||
|
.sp 1
|
||||||
|
.DE
|
||||||
|
.DS L
|
||||||
|
.SH
|
||||||
|
Acknowledgment Message
|
||||||
|
.so unused
|
||||||
|
.LP
|
||||||
|
Type: TSP_ACK (2)
|
||||||
|
.sp 1
|
||||||
|
.PP
|
||||||
|
Both the master and the slaves use this message for
|
||||||
|
acknowledgment only.
|
||||||
|
It is used in several different contexts, for example
|
||||||
|
in reply to an Adjtime message.
|
||||||
|
.sp 1
|
||||||
|
.DE
|
||||||
|
.DS L
|
||||||
|
.SH
|
||||||
|
Master Request Message
|
||||||
|
.so unused
|
||||||
|
.LP
|
||||||
|
Type: TSP_MASTERREQ (3)
|
||||||
|
.sp 1
|
||||||
|
.PP
|
||||||
|
A newly-started time daemon broadcasts this message to
|
||||||
|
locate a master. No other action is implied by this packet.
|
||||||
|
It requires a Master Acknowledgment.
|
||||||
|
.sp 1
|
||||||
|
.DE
|
||||||
|
.DS L
|
||||||
|
.SH
|
||||||
|
Master Acknowledgement
|
||||||
|
.so unused
|
||||||
|
.LP
|
||||||
|
Type: TSP_MASTERACK (4)
|
||||||
|
.sp 1
|
||||||
|
.PP
|
||||||
|
The master sends this message to acknowledge the Master Request message
|
||||||
|
and the Conflict Resolution Message.
|
||||||
|
.sp 1
|
||||||
|
.DE
|
||||||
|
.DS L
|
||||||
|
.SH
|
||||||
|
Set Network Time Message
|
||||||
|
.so date
|
||||||
|
.LP
|
||||||
|
Type: TSP_SETTIME (5)
|
||||||
|
.sp 1
|
||||||
|
.PP
|
||||||
|
The master sends this message to slave time daemons to set their time.
|
||||||
|
This packet is sent to newly started time daemons and when the network
|
||||||
|
date is changed.
|
||||||
|
It contains the master's time as an approximation of the network time.
|
||||||
|
It requires an acknowledgment.
|
||||||
|
The next
|
||||||
|
synchronization round will eliminate the small time difference
|
||||||
|
caused by the random delay in the communication channel.
|
||||||
|
.sp 1
|
||||||
|
.DE
|
||||||
|
.DS L
|
||||||
|
.SH
|
||||||
|
Master Active Message
|
||||||
|
.so unused
|
||||||
|
.LP
|
||||||
|
Type: TSP_MASTERUP (6)
|
||||||
|
.sp 1
|
||||||
|
.PP
|
||||||
|
The master broadcasts this message to
|
||||||
|
solicit the names of the active slaves.
|
||||||
|
Slaves will reply with a Slave Active message.
|
||||||
|
.sp 1
|
||||||
|
.DE
|
||||||
|
.DS L
|
||||||
|
.SH
|
||||||
|
Slave Active Message
|
||||||
|
.so unused
|
||||||
|
.LP
|
||||||
|
Type: TSP_SLAVEUP (7)
|
||||||
|
.sp 1
|
||||||
|
.PP
|
||||||
|
A slave sends this message to the master in answer to a Master Active message.
|
||||||
|
This message is also sent when a new slave starts up to inform the master that
|
||||||
|
it wants to be synchronized.
|
||||||
|
.sp 1
|
||||||
|
.DE
|
||||||
|
.DS L
|
||||||
|
.SH
|
||||||
|
Master Candidature Message
|
||||||
|
.so unused
|
||||||
|
.LP
|
||||||
|
Type: TSP_ELECTION (8)
|
||||||
|
.sp 1
|
||||||
|
.PP
|
||||||
|
A slave eligible to become a master broadcasts this message when its election
|
||||||
|
timer expires.
|
||||||
|
The message declares that the slave wishes to become the new master.
|
||||||
|
.sp 1
|
||||||
|
.DE
|
||||||
|
.DS L
|
||||||
|
.SH
|
||||||
|
Candidature Acceptance Message
|
||||||
|
.so unused
|
||||||
|
.LP
|
||||||
|
Type: TSP_ACCEPT (9)
|
||||||
|
.sp 1
|
||||||
|
.PP
|
||||||
|
A slave sends this message to accept the candidature of the time daemon
|
||||||
|
that has broadcast an Election message.
|
||||||
|
The candidate will add the slave's name to the list of machines that it
|
||||||
|
will control should it become the master.
|
||||||
|
.sp 1
|
||||||
|
.DE
|
||||||
|
.DS L
|
||||||
|
.SH
|
||||||
|
Candidature Rejection Message
|
||||||
|
.so unused
|
||||||
|
.LP
|
||||||
|
Type: TSP_REFUSE (10)
|
||||||
|
.sp 1
|
||||||
|
.PP
|
||||||
|
After a slave accepts the candidature of a time daemon, it will reply
|
||||||
|
to any election messages from other slaves
|
||||||
|
with this message.
|
||||||
|
This rejects any candidature other than the first received.
|
||||||
|
.sp 1
|
||||||
|
.DE
|
||||||
|
.DS L
|
||||||
|
.SH
|
||||||
|
Multiple Master Notification Message
|
||||||
|
.so unused
|
||||||
|
.LP
|
||||||
|
Type: TSP_CONFLICT (11)
|
||||||
|
.sp 1
|
||||||
|
.PP
|
||||||
|
When two or more masters reply to a Master Request message, the slave
|
||||||
|
uses this message to inform one of them that more than one master exists.
|
||||||
|
.sp 1
|
||||||
|
.DE
|
||||||
|
.DS L
|
||||||
|
.SH
|
||||||
|
Conflict Resolution Message
|
||||||
|
.so unused
|
||||||
|
.LP
|
||||||
|
Type: TSP_RESOLVE (12)
|
||||||
|
.sp 1
|
||||||
|
.PP
|
||||||
|
A master which has been informed of the existence of other masters
|
||||||
|
broadcasts this message to determine who the other masters are.
|
||||||
|
.sp 1
|
||||||
|
.DE
|
||||||
|
.DS L
|
||||||
|
.SH
|
||||||
|
Quit Message
|
||||||
|
.so unused
|
||||||
|
.LP
|
||||||
|
Type: TSP_QUIT (13)
|
||||||
|
.sp 1
|
||||||
|
.PP
|
||||||
|
This message is sent by the master in three different contexts:
|
||||||
|
1) to a candidate that broadcasts an Master Candidature message,
|
||||||
|
2) to another master when notified of its existence,
|
||||||
|
3) to another master if a loop is detected.
|
||||||
|
In all cases, the recipient time daemon will become a slave.
|
||||||
|
This message requires an acknowledgement.
|
||||||
|
.sp 1
|
||||||
|
.DE
|
||||||
|
.DS L
|
||||||
|
.SH
|
||||||
|
Set Date Message
|
||||||
|
.so date
|
||||||
|
.LP
|
||||||
|
Type: TSP_SETDATE (22)
|
||||||
|
.sp 1
|
||||||
|
.PP
|
||||||
|
The program \fIdate\fP\|(1) sends this message to the local time daemon
|
||||||
|
when a super-user wants to set the network date.
|
||||||
|
If the local time daemon is the master, it will set the date;
|
||||||
|
if it is a slave, it will communicate the desired date to the master.
|
||||||
|
.sp 1
|
||||||
|
.DE
|
||||||
|
.DS L
|
||||||
|
.SH
|
||||||
|
Set Date Request Message
|
||||||
|
.so date
|
||||||
|
.LP
|
||||||
|
Type: TSP_SETDATEREQ (23)
|
||||||
|
.sp 1
|
||||||
|
.PP
|
||||||
|
A slave that has received a Set Date message will communicate the
|
||||||
|
desired date to the master using this message.
|
||||||
|
.sp 1
|
||||||
|
.DE
|
||||||
|
.DS L
|
||||||
|
.SH
|
||||||
|
Set Date Acknowledgment Message
|
||||||
|
.so unused
|
||||||
|
.LP
|
||||||
|
Type: TSP_DATEACK (16)
|
||||||
|
.sp 1
|
||||||
|
.PP
|
||||||
|
The master sends this message to a slave in acknowledgment of a
|
||||||
|
Set Date Request Message.
|
||||||
|
The same message is sent by the local time daemon to the program
|
||||||
|
\fIdate(1)\fP to confirm that the network date has been set by the
|
||||||
|
master.
|
||||||
|
.sp 1
|
||||||
|
.DE
|
||||||
|
.DS L
|
||||||
|
.SH
|
||||||
|
Start Tracing Message
|
||||||
|
.so unused
|
||||||
|
.LP
|
||||||
|
Type: TSP_TRACEON (17)
|
||||||
|
.sp 1
|
||||||
|
.PP
|
||||||
|
The controlling program \fItimedc\fP sends this message to the local
|
||||||
|
time daemon to start the recording in a system file of
|
||||||
|
all messages received.
|
||||||
|
.sp 1
|
||||||
|
.DE
|
||||||
|
.DS L
|
||||||
|
.SH
|
||||||
|
Stop Tracing Message
|
||||||
|
.so unused
|
||||||
|
.LP
|
||||||
|
Type: TSP_TRACEOFF (18)
|
||||||
|
.sp 1
|
||||||
|
.PP
|
||||||
|
\fITimedc\fP sends this message to the local
|
||||||
|
time daemon to stop the recording of
|
||||||
|
messages received.
|
||||||
|
.sp 1
|
||||||
|
.DE
|
||||||
|
.DS L
|
||||||
|
.SH
|
||||||
|
Master Site Message
|
||||||
|
.so unused
|
||||||
|
.LP
|
||||||
|
Type: TSP_MSITE (19)
|
||||||
|
.sp 1
|
||||||
|
.PP
|
||||||
|
\fITimedc\fP sends this message to the local time daemon to find out
|
||||||
|
where the master is running.
|
||||||
|
.sp 1
|
||||||
|
.DE
|
||||||
|
.DS L
|
||||||
|
.SH
|
||||||
|
Remote Master Site Message
|
||||||
|
.so unused
|
||||||
|
.LP
|
||||||
|
Type: TSP_MSITEREQ (20)
|
||||||
|
.sp 1
|
||||||
|
.PP
|
||||||
|
A local time daemon broadcasts this message to find the location
|
||||||
|
of the master.
|
||||||
|
It then uses the Acknowledgement message to
|
||||||
|
communicate this location to \fItimedc\fP.
|
||||||
|
.sp 1
|
||||||
|
.DE
|
||||||
|
.DS L
|
||||||
|
.SH
|
||||||
|
Test Message
|
||||||
|
.so unused
|
||||||
|
.LP
|
||||||
|
Type: TSP_TEST (21)
|
||||||
|
.sp 1
|
||||||
|
.PP
|
||||||
|
For testing purposes, \fItimedc\fP sends this message to a slave
|
||||||
|
to cause its election timer to expire. NOTE: \fItimed\fP
|
||||||
|
is not normally compiled to support this.
|
||||||
|
.sp 1
|
||||||
|
.DE
|
||||||
|
.SH
|
||||||
|
.DS L
|
||||||
|
.SH
|
||||||
|
Loop Detection Message
|
||||||
|
.so loop
|
||||||
|
.LP
|
||||||
|
Type: TSP_LOOP (24)
|
||||||
|
.sp 1
|
||||||
|
.PP
|
||||||
|
This packet is initiated by all masters occasionally to attempt to detect loops.
|
||||||
|
All submasters forward this packet onto the networks over which they are master.
|
||||||
|
If a master receives a packet it sent out initially,
|
||||||
|
it knows that a loop exists and tries to correct the problem.
|
||||||
|
.DE
|
||||||
|
.SH
|
||||||
|
References
|
||||||
|
.IP 1.
|
||||||
|
R. Gusella and S. Zatti,
|
||||||
|
\fITEMPO: A Network Time Controller for Distributed Berkeley UNIX System\fP,
|
||||||
|
USENIX Summer Conference Proceedings, Salt Lake City, June 1984.
|
||||||
|
.IP 2.
|
||||||
|
R. Gusella and S. Zatti, \fIClock Synchronization in a Local Area Network\fP,
|
||||||
|
University of California, Berkeley, Technical Report, \fIto appear\fP.
|
||||||
|
.IP 3.
|
||||||
|
R. Gusella and S. Zatti,
|
||||||
|
\fIAn Election Algorithm for a Distributed Clock Synchronization Program\fP,
|
||||||
|
University of California, Berkeley, CS Technical Report #275, Dec. 1985.
|
||||||
|
.IP 4.
|
||||||
|
Postel, J., \fIUser Datagram Protocol\fP, RFC 768.
|
||||||
|
Network Information Center, SRI International, Menlo Park, California,
|
||||||
|
August 1980.
|
||||||
|
.IP 5.
|
||||||
|
Postel, J., \fIInternet Control Message Protocol\fP, RFC 792.
|
||||||
|
Network Information Center, SRI International, Menlo Park, California,
|
||||||
|
September 1981.
|
||||||
53
usr.sbin/timed/SMM.doc/timed/unused
Normal file
53
usr.sbin/timed/SMM.doc/timed/unused
Normal file
@ -0,0 +1,53 @@
|
|||||||
|
.\" Copyright (c) 1986, 1993
|
||||||
|
.\" The Regents of the University of California. All rights reserved.
|
||||||
|
.\"
|
||||||
|
.\" Redistribution and use in source and binary forms, with or without
|
||||||
|
.\" modification, are permitted provided that the following conditions
|
||||||
|
.\" are met:
|
||||||
|
.\" 1. Redistributions of source code must retain the above copyright
|
||||||
|
.\" notice, this list of conditions and the following disclaimer.
|
||||||
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
||||||
|
.\" notice, this list of conditions and the following disclaimer in the
|
||||||
|
.\" documentation and/or other materials provided with the distribution.
|
||||||
|
.\" 3. All advertising materials mentioning features or use of this software
|
||||||
|
.\" must display the following acknowledgement:
|
||||||
|
.\" This product includes software developed by the University of
|
||||||
|
.\" California, Berkeley and its contributors.
|
||||||
|
.\" 4. Neither the name of the University nor the names of its contributors
|
||||||
|
.\" may be used to endorse or promote products derived from this software
|
||||||
|
.\" without specific prior written permission.
|
||||||
|
.\"
|
||||||
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
||||||
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||||||
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||||||
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
||||||
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||||||
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||||||
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||||
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||||
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||||||
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||||||
|
.\" SUCH DAMAGE.
|
||||||
|
.\"
|
||||||
|
.\" @(#)unused 8.1 (Berkeley) 6/8/93
|
||||||
|
.\"
|
||||||
|
.ft B
|
||||||
|
.TS
|
||||||
|
center;
|
||||||
|
ce | ce | ce | ce
|
||||||
|
| c | c | c | s |
|
||||||
|
| c s s s |.
|
||||||
|
Byte 1 Byte 2 Byte 3 Byte 4
|
||||||
|
=
|
||||||
|
Type Version No. Sequence No.
|
||||||
|
_
|
||||||
|
( unused )
|
||||||
|
_
|
||||||
|
( unused )
|
||||||
|
_
|
||||||
|
Machine Name
|
||||||
|
_
|
||||||
|
\&. . .
|
||||||
|
_
|
||||||
|
.TE
|
||||||
|
.ft R
|
||||||
Loading…
Reference in New Issue
Block a user