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<?xml version="1.0" encoding="utf-8"?> |
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<?xml version="1.0" encoding="euc-jp"?> |
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<!DOCTYPE article PUBLIC "-//FreeBSD//DTD DocBook XML V5.0-Based Extension//EN" "http://www.FreeBSD.org/XML/share/xml/freebsd50.dtd"> |
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<!DOCTYPE article PUBLIC "-//FreeBSD//DTD DocBook XML V5.0-Based Extension//EN" "http://www.FreeBSD.org/XML/share/xml/freebsd50.dtd"> |
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<article xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" version="5.0" xml:id="leapseconds" xml:lang="ja_JP"> |
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<article xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" version="5.0" xml:id="leapseconds" xml:lang="ja_JP"> |
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<title>FreeBSDã«ãããéç§ã®ãµãã¼ãã«ã¤ãã¦</title> |
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<title>FreeBSD¤Ë¤ª¤±¤ë±¼ÉäΥµ¥Ý¡¼¥È¤Ë¤Ä¤¤¤Æ</title> |
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<pubdate>$FreeBSD$</pubdate> |
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<pubdate>$FreeBSD$</pubdate> |
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<sect1 xml:id="leapseconds-definition"> |
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<title>ã¤ã³ãããã¯ã·ã§ã³</title> |
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<title>¥¤¥ó¥È¥í¥À¥¯¥·¥ç¥ó</title> |
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<para><emphasis>leap second</emphasis>(éç§)ã¯å°çã®èªè»¢ã¨æå»ãåæãããããã«ä½¿ç¨ãããç¹å¥ãªç§ã®ãã¨ã§ãããã®è¨äºã¯FreeBSDãã©ã®ããã«éç§ãæ±ã£ã¦ãããã解説ãã¾ãã</para> |
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<para><emphasis>leap second</emphasis>(±¼ÉÃ)¤ÏÃϵå¤Î¼«Å¾¤È»þ¹ï¤òƱ´ü¤µ¤»¤ë¤¿¤á¤Ë»ÈÍѤµ¤ì¤ëÆÃÊ̤ÊÉäΤ³¤È¤Ç¤¹¡£¤³¤Îµ»ö¤ÏFreeBSD¤¬¤É¤Î¤è¤¦¤Ë±¼Éäò°·¤Ã¤Æ¤¤¤ë¤«¤ò²òÀ⤷¤Þ¤¹¡£</para> |
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<para>éç§ã¯<link xlink:href="http://datacenter.iers.org/web/guest/bulletins/-/somos/5Rgv/product/16">Bulletin C</link>ã«ããã<link xlink:href="http://datacenter.iers.org/"><acronym>IERS</acronym></link>ã«ããã¦çºè¡¨ããã¦ãã¾ãã</para> |
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<para>±¼ÉäÏ<link xlink:href="http://datacenter.iers.org/web/guest/bulletins/-/somos/5Rgv/product/16">Bulletin C</link>¤Ë¤ª¤±¤ë<link xlink:href="http://datacenter.iers.org/"><acronym>IERS</acronym></link>¤Ë¤ª¤¤¤Æȯɽ¤µ¤ì¤Æ¤¤¤Þ¤¹¡£</para> |
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<para>éç§ã®ä¸è¬çãªåä½ã«é¢ãã¦ã¯<link xlink:href="https://tools.ietf.org/html/rfc7164#section-3">RFC 7164</link>ã§è§£èª¬ããã¦ãã¾ãã<citerefentry><refentrytitle>time2posix</refentrytitle><manvolnum>3</manvolnum></citerefentry>ã«é¢ãã¦ãåç
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<para>±¼ÉäΰìÈÌŪ¤ÊÆ°ºî¤Ë´Ø¤·¤Æ¤Ï<link xlink:href="https://tools.ietf.org/html/rfc7164#section-3">RFC 7164</link>¤Ç²òÀ⤵¤ì¤Æ¤¤¤Þ¤¹¡£<citerefentry><refentrytitle>time2posix</refentrytitle><manvolnum>3</manvolnum></citerefentry>¤Ë´Ø¤·¤Æ¤â»²¾È¤·¤Æ¤¯¤À¤µ¤¤¡£</para> |
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<sect1 xml:id="leapseconds-posix"> |
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<title>FreeBSDã«ãããããã©ã«ãã®éç§ã®ãã³ããªã³ã°æ¹æ³</title> |
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<title>FreeBSD¤Ë¤ª¤±¤ë¥Ç¥Õ¥©¥ë¥È¤Î±¼ÉäΥϥó¥É¥ê¥ó¥°ÊýË¡</title> |
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<para>éç§ã®ãã£ã¨ãç°¡åãªåãæ±ãæ¹æ³ã¯FreeBSDãããã©ã«ãã§ä½¿ã£ã¦ãã<acronym>POSIX</acronym>ã®ã¿ã¤ã ã«ã¼ã«ã¨<link xlink:href="@@URL_RELPREFIX@@/doc/en_US.ISO8859-1/books/handbook/network-ntp.html"><acronym>NTP</acronym></link>ãçµã¿åãããæ¹æ³ã§ãã<citerefentry><refentrytitle>ntpd</refentrytitle><manvolnum>8</manvolnum></citerefentry>ãä¸ä½ã®<acronym>NTP</acronym>ãµã¼ãã¨åæãã¦ããå ´åã«ã¯éç§ã¯é©åã«å¦çãããéç§ã¯æ¥ã®æå¾ã®ç§ãããä¸åº¦ç¹°ãè¿ãã¨ããæ¹æ³ãèªåçã«å®æ½ãã¾ãããã以å¤ã®èª¿æ´ã¯å¿
è¦ããã¾ããã</para> |
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<para>±¼ÉäΤâ¤Ã¤È¤â´Êñ¤Ê¼è¤ê°·¤¤ÊýË¡¤ÏFreeBSD¤¬¥Ç¥Õ¥©¥ë¥È¤Ç»È¤Ã¤Æ¤¤¤ë<acronym>POSIX</acronym>¤Î¥¿¥¤¥à¥ë¡¼¥ë¤È<link xlink:href="@@URL_RELPREFIX@@/doc/en_US.ISO8859-1/books/handbook/network-ntp.html"><acronym>NTP</acronym></link>¤òÁȤ߹ç¤ï¤»¤ëÊýË¡¤Ç¤¹¡£<citerefentry><refentrytitle>ntpd</refentrytitle><manvolnum>8</manvolnum></citerefentry>¤¬¾å°Ì¤Î<acronym>NTP</acronym>¥µ¡¼¥Ð¤ÈƱ´ü¤·¤Æ¤¤¤ë¾ì¹ç¤Ë¤Ï±¼ÉäÏŬÀڤ˽èÍý¤µ¤ì¡¢±¼ÉäÏÆü¤ÎºÇ¸å¤ÎÉäò¤â¤¦°ìÅÙ·«¤êÊÖ¤¹¤È¤¤¤¦ÊýË¡¤ò¼«Æ°Åª¤Ë¼Â»Ü¤·¤Þ¤¹¡£¤³¤ì°Ê³°¤ÎÄ´À°¤ÏɬÍפ¢¤ê¤Þ¤»¤ó¡£</para> |
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<para>ã¢ããã¹ããªã¼ã <acronym>NTP</acronym>ãµã¼ããéç§ãé©åã«å¦çãã¦ããªãå ´åã<citerefentry><refentrytitle>ntpd</refentrytitle><manvolnum>8</manvolnum></citerefentry>ã¯æå»ã®ããã«æ°ã¥ããã¢ããã¹ããªã¼ã ãµã¼ããæå»ãä¿®æ£ãããã¨ã«æå»ãåããããã¨ã«ãªãã¾ãã</para> |
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<para>¥¢¥Ã¥×¥¹¥È¥ê¡¼¥à<acronym>NTP</acronym>¥µ¡¼¥Ð¤¬±¼ÉäòŬÀڤ˽èÍý¤·¤Æ¤¤¤Ê¤¤¾ì¹ç¡¢<citerefentry><refentrytitle>ntpd</refentrytitle><manvolnum>8</manvolnum></citerefentry>¤Ï»þ¹ï¤Î¤º¤ì¤Ëµ¤¤Å¤¤¤¿¥¢¥Ã¥×¥¹¥È¥ê¡¼¥à¥µ¡¼¥Ð¤¬»þ¹ï¤ò½¤Àµ¤·¤¿¤¢¤È¤Ë»þ¹ï¤ò¹ç¤ï¤»¤ë¤³¤È¤Ë¤Ê¤ê¤Þ¤¹¡£</para> |
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<para><acronym>NTP</acronym>ã使ã£ã¦ããªãå ´åãéç§ãçµéãããã¨ã«æåã§ã·ã¹ãã ã¯ããã¯ãå¤æ´ããå¿
è¦ãããã¾ãã</para> |
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<para><acronym>NTP</acronym>¤ò»È¤Ã¤Æ¤¤¤Ê¤¤¾ì¹ç¡¢±¼É䬷вᤷ¤¿¤¢¤È¤Ë¼êÆ°¤Ç¥·¥¹¥Æ¥à¥¯¥í¥Ã¥¯¤òÊѹ¹¤¹¤ëɬÍפ¬¤¢¤ê¤Þ¤¹¡£</para> |
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</sect1> |
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<sect1 xml:id="leapseconds-cautions"> |
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<sect1 xml:id="leapseconds-cautions"> |
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<title>注æäºé
</title> |
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<title>Ãí°Õ»ö¹à</title> |
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<para>éç§ã¯<acronym>UTC</acronym>(åå®ä¸çæ)ã§ã®çå¤ä¸ã«ä¸çä¸ã§åæã«æ¿å
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<para>FreeBSDã§ã¯é©åã§å®å®ãã<acronym>NTP</acronym>ãµã¼ãã¹ãæä¾ããã¦ããã°å
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<para>FreeBSDã¨åãæ¹æ³ã§éç§ãå¦çãã¦ãããã¦ããªãã«é¢ãããã»ãã®ãªãã¬ã¼ãã£ã³ã°ã·ã¹ãã ãã»ãã®ã³ã³ãã¥ã¼ã¿ã¨ãé©åã§å®å®ãã<acronym>NTP</acronym>ãµã¼ãã¹ã使ç¨ãã¦ããªãã·ã¹ãã ã¯éç§ã«é¢ãã¦ã¯ã¾ã£ããé¢ç¥ãã¦ããã¾ããã</para> |
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<para>FreeBSD¤ÈƱ¤¸ÊýË¡¤Ç±¼Éäò½èÍý¤·¤Æ¤¤¤ë¤·¤Æ¤¤¤Ê¤¤¤Ë´Ø¤ï¤é¤º¤Û¤«¤Î¥ª¥Ú¥ì¡¼¥Æ¥£¥ó¥°¥·¥¹¥Æ¥à¤ä¤Û¤«¤Î¥³¥ó¥Ô¥å¡¼¥¿¤È¡¢Å¬ÀڤǰÂÄꤷ¤¿<acronym>NTP</acronym>¥µ¡¼¥Ó¥¹¤ò»ÈÍѤ·¤Æ¤¤¤Ê¤¤¥·¥¹¥Æ¥à¤Ï±¼Éä˴ؤ·¤Æ¤Ï¤Þ¤Ã¤¿¤¯´ØÃΤ·¤Æ¤¯¤ì¤Þ¤»¤ó¡£</para> |
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</sect1> |
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<sect1 xml:id="leapseconds-testing"> |
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<sect1 xml:id="leapseconds-testing"> |
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<title>ãã¹ãæ¹æ³</title> |
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<title>¥Æ¥¹¥ÈÊýË¡</title> |
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<screen><prompt>%</prompt> <userinput>ntpq -c 'rv 0 leap'</userinput></screen> |
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<screen><prompt>%</prompt> <userinput>ntpq -c 'rv 0 leap'</userinput></screen> |
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<para><literal>leap_add_sec</literal>ã¤ã³ãã£ã±ã¼ã¿ãå«ãã åºåã¯éç§ãé©åã«ãµãã¼ããã¦ãããã¨ãæå³ãã¦ãã¾ããéç§ãçºçããããã24æéåãã¾ãã¯éç§ãçºçããå¾ã«ã¯<literal>leap_none</literal>ã表示ããã¾ãã</para> |
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<para><literal>leap_add_sec</literal>¥¤¥ó¥Ç¥£¥±¡¼¥¿¤ò´Þ¤ó¤À½ÐÎϤϱ¼ÉäòŬÀڤ˥µ¥Ý¡¼¥È¤·¤Æ¤¤¤ë¤³¤È¤ò°ÕÌ£¤·¤Æ¤¤¤Þ¤¹¡£±¼Éä¬È¯À¸¤¹¤ë¤è¤ê¤â24»þ´ÖÁ°¡¢¤Þ¤¿¤Ï±¼Éä¬È¯À¸¤·¤¿¸å¤Ë¤Ï<literal>leap_none</literal>¤¬É½¼¨¤µ¤ì¤Þ¤¹¡£</para> |
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</sect1> |
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<sect1 xml:id="leapseconds-conclusion"> |
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<sect1 xml:id="leapseconds-conclusion"> |
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<title>çµè«</title> |
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<title>·ëÏÀ</title> |
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<para>å®éã®ã¨ãããéç§ãFreeBSDã§åé¡ã«ãªããã¨ã¯ããã¾ããããã®è¦ç´ãã©ã®ããã«éç§ã®å¦çã§ä½ãè¡ãããã®ããã©ããã£ã¦éç§ã®å¦çãåé¡ãªãæ¸ã¾ããã°ããã®ãã¨ããèããæ確ã«ããæå©ãã«ãªãã°ã¨æãã¾ãã</para> |
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<para>¼ÂºÝ¤Î¤È¤³¤í¡¢±¼Éä¬FreeBSD¤ÇÌäÂê¤Ë¤Ê¤ë¤³¤È¤Ï¤¢¤ê¤Þ¤»¤ó¡£¤³¤ÎÍ×Ì󤬤ɤΤ褦¤Ë±¼ÉäνèÍý¤Ç²¿¤¬¹Ô¤ï¤ì¤ë¤Î¤«¡¢¤É¤¦¤ä¤Ã¤Æ±¼ÉäνèÍý¤òÌäÂê¤Ê¤¯ºÑ¤Þ¤»¤ì¤Ð¤è¤¤¤Î¤«¤È¤¤¤¦¹Í¤¨¤òÌÀ³Î¤Ë¤¹¤ë¼ê½õ¤±¤Ë¤Ê¤ì¤Ð¤È»×¤¤¤Þ¤¹¡£</para> |
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</sect1> |
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</sect1> |
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</article> |
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</article> |