Linux Certif

Toute la documentation sur la certification Linux LPI

tzfile

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#include <tzfile.h>

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tzh_leapcnt

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tzh_timecnt

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tzh_typecnt

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tzh_charcnt

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¾åµ­¤Î¥Ø¥Ã¥À¤Ë³¤¤¤Æ tzh_timecnt ¤È¤¤¤¦ 4 ¥Ð¥¤¥È¤Î long ·¿¤ÎÃͤ¬ (Ê£¿ô¸Ä) ³¤¯¡£¾º½ç¤ÇÊݴɤµ¤ì¤Æ¤¤¤ë¡£ ¤³¤ì¤é¤ÎÃͤϡÖɸ½à¡×¥Ð¥¤¥È¥ª¡¼¥À¡¼¤Çµ­½Ò¤µ¤ì¤Æ¤¤¤ë¡£ ¤½¤ì¤¾¤ì¤ÏÁ«°Ü»þ´Ö (time(2) ¤¬ÊÖ¤¹ÃÍ) ¤È¤·¤ÆÍѤ¤¤é¤ì¡¢ ¤½¤ì¤¾¤ì¤Ë¤ª¤¤¤Æ¥í¡¼¥«¥ë»þ´Ö¤Î·×»»¥ë¡¼¥ë¤¬Êѹ¹¤µ¤ì¤ë¡£ ¼¡¤ËÍè¤ë¤Î¤Ï tzh_timecnt ¤Ç¡¢¤³¤ì¤Ï unsigned char ·¿¤Î 1 ¥Ð¥¤¥È¤ÎÃͤǤ¢¤ë (Ê£¿ô¸Ä³¤¯¤³¤È¤â¤¢¤ë)¡£ ¤³¤ÎÃͤϡ¢¥Õ¥¡¥¤¥ë¤Çµ­½Ò¤µ¤ì¤Æ¤¤¤ë°Û¤Ê¤Ã¤¿¥¿¥¤¥×¤Î¡Ö¥í¡¼¥«¥ë»þ´Ö¡×¤¬¡¢ ¤½¤ì¤¾¤ìƱ¤¸¤è¤¦¤Ë¥¤¥ó¥Ç¥Ã¥¯¥¹¤µ¤ì¤¿Á«°Ü»þ´Ö¤Î¤É¤ì¤Ë´ØÏ¢¤Å¤±¤é¤ì¤Æ ¤¤¤ë¤«¤ò¼¨¤¹¡£ ¤³¤ì¤é¤ÎÃÍ¤Ï ttinifo ¹½Â¤ÂΤÎÇÛÎó¤ËÂФ¹¤ë¥¤¥ó¥Ç¥Ã¥¯¥¹¤È¤·¤ÆÄ󶡤µ¤ì¤Æ¤¤¤ë¡£ ttinfo ¹½Â¤ÂΤϥե¡¥¤¥ëÃæ¤Ç¼¡¤Î°ÌÃÖ¤ËÃÖ¤«¤ì¤ë¡£ ¤³¤Î¹½Â¤ÂΤϰʲ¼¤Î¤è¤¦¤ËÄêµÁ¤µ¤ì¤Æ¤¤¤ë:

struct ttinfo {

    long         tt_gmtoff;

    int          tt_isdst;

    unsigned int tt_abbrind;

};

¤½¤ì¤¾¤ì¤Î¹½Â¤ÂΤϡ¢ 4 ¥Ð¥¤¥È¤Î long ·¿¤ÎÃÍ tt_gmtoff¡¢ 1 ¥Ð¥¤¥È¤ÎÃÍ tt_isdst, 1 ¥Ð¥¤¥È¤ÎÃÍ tt_abbrind ¤«¤é¹½À®¤µ¤ì¤ë¡£ ¤½¤ì¤¾¤ì¤Î¹½Â¤ÂΤˤª¤¤¤Æ¡¢ tt_gmtoff ¤Ï UTC ¤Ë²Ã¤¨¤ë¤Ù¤­Éÿô¤òÍ¿¤¨¡¢ tt_isdst ¤Ï tm_isdst ¤ò localtime(3) ¤Ë¥»¥Ã¥È¤¹¤Ù¤­¤«¤É¤¦¤«¤ò¼¨¤·¡¢ tt_abbrind ¤Ï¥Õ¥¡¥¤¥ëÃæ¤Ç ttinfo ¹½Â¤ÂÎ (ÇÛÎó) ¤Î¤¢¤È¤ËÃÖ¤«¤ì¤ë ¥¿¥¤¥à¥¾¡¼¥óά¼°Ê¸»úÎó¤ÎÇÛÎó¤ËÂФ¹¤ë¥¤¥ó¥Ç¥Ã¥¯¥¹¤Ç¤¢¤ë¡£

¼¡¤Ë¤Ï 4 ¥Ð¥¤¥ÈÃͤΥڥ¢¤Ç¤¢¤ë tzh_leapcnt ¤¬ (Ê£¿ô¸Ä) ³¤¯¡£É¸½à¥Ð¥¤¥È¥ª¡¼¥À¡¼¤Çµ­½Ò¤µ¤ì¤ë¡£ ¤½¤ì¤¾¤ì¤Î¥Ú¥¢¤ÎºÇ½é¤ÎÃͤϱ¼Éäε¯¤­¤¿»þ¹ï¤ò ( time(2) ¤ÎÊÖ¤¹·Á¼°¤Ç) Í¿¤¨¡¢ÆóÈÖÌܤÎÃͤϤ½¤Î»þ¹ï¤Ë²Ã¤¨¤ë¤Ù¤­±¼Éÿô¤Î Á´Éÿô¤òÍ¿¤¨¤ë¡£¤³¤ì¤é¤Î¥Ú¥¢¤Ï»þ¹ï¤Î¸Å¤¤½ç¤Ëµ­½Ò¤¹¤ë¡£

¼¡¤Ë¤Ï tzh_ttisstdcnt ¤¬ÃÖ¤«¤ì¤ë¡£¤³¤ì¤Ï standard/wall ¥¤¥ó¥¸¥±¡¼¥¿¤Ç¡¢¤½¤ì¤¾¤ì 1 ¥Ð¥¤¥È¤Î ÃͤòÊݴɤ¹¤ë¡£¤³¤ì¤é¤Ï¥í¡¼¥«¥ë»þ´Ö¤Î¥¿¥¤¥×¤Ë´ØÏ¢¤Å¤±¤é¤ì¤¿Á«°Ü»þ´Ö¤¬ ɸ½à»þ¹ï (standard time) ¤ÈÊÉ»þ·×»þ¹ï (wall clock time) ¤Î ¤É¤Á¤é¤Ç»ØÄꤵ¤ì¤Æ¤¤¤ë¤«¤ò¼¨¤¹¡£¤Þ¤¿¤³¤ÎÃͤϡ¢ POSIX ¥¹¥¿¥¤¥ë¤Î¥¿¥¤¥à¥¾¡¼¥ó´Ä¶­ÊÑ¿ô¤ò½èÍý¤¹¤ë¤È¤­¤Ë ¥¿¥¤¥à¥¾¡¼¥ó¥Õ¥¡¥¤¥ë¤¬»È¤ï¤ì¤ë¤È¤­¤Ë¤âÍøÍѤµ¤ì¤ë¡£

ºÇ¸å¤Ë tzh_ttisgmtcnt ¤¬ÃÖ¤«¤ì¤ë¡£¤³¤ì¤Ï UTC/local ¥¤¥ó¥¸¥±¡¼¥¿¤Ç¡¢¤½¤ì¤¾¤ì 1 ¥Ð¥¤¥È¤Î ÃͤòÊݴɤ¹¤ë¡£¤³¤ì¤é¤Ï¥í¡¼¥«¥ë»þ´Ö¤Î¥¿¥¤¥×¤Ë´ØÏ¢¤Å¤±¤é¤ì¤¿Á«°Ü»þ´Ö¤¬ UTC ¤È¥í¡¼¥«¥ë»þ¹ï¤Î¤É¤Á¤é¤Ç»ØÄꤵ¤ì¤Æ¤¤¤ë¤«¤ò¼¨¤¹¡£¤Þ¤¿¤³¤ÎÃͤϡ¢ POSIX ¥¹¥¿¥¤¥ë¤Î¥¿¥¤¥à¥¾¡¼¥ó´Ä¶­ÊÑ¿ô¤ò½èÍý¤¹¤ë¤È¤­¤Ë ¥¿¥¤¥à¥¾¡¼¥ó¥Õ¥¡¥¤¥ë¤¬»È¤ï¤ì¤ë¤È¤­¤Ë¤âÍøÍѤµ¤ì¤ë¡£

localtime ¤Ï¡¢ tzh_timeout ¤¬ 0 ¤Ç¤¢¤ë¤« time °ú¿ô¤¬¥Õ¥¡¥¤¥ë¤Ëµ­Ï¿¤µ¤ì¤Æ¤¤¤¿ºÇ½é¤ÎÁ«°Ü»þ¹ï ¤è¤ê¤â¾®¤µ¤¤¾ì¹ç¤Ë¤Ï¡¢ ¥Õ¥¡¥¤¥ë¤ËºÇ½é¤Ë¸½¤ì¤ëɸ½à»þ¹ï¤Î ttinfo ¹½Â¤ÂΤò»È¤¦ (¤Þ¤¿¤Ïɸ½à»þ¹ï¤Î¹½Â¤ÂΤ¬¤Ê¤¤¾ì¹ç¤Ï¡¢Ã±¤ËºÇ½é¤Î ttinfo ¹½Â¤ÂΤò»È¤¦)¡£