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adjtimex
Langue: ja
Version: 2004-05-27 (openSuse - 09/10/07)
Section: 2 (Appels système)
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adjtimex - ¥«¡¼¥Í¥ë¤Î»þ·×¤òÄ´À°¤¹¤ë½ñ¼°
#include <sys/timex.h>int adjtimex(struct timex *buf);
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Linux ¤Ï David L. Mill ¤Î»þ·×Ä´Àᥢ¥ë¥´¥ê¥º¥à¤ò»ÈÍѤ·¤Æ¤¤¤ë (RFC 1305 ¤ò»²¾È)¡£ ¥·¥¹¥Æ¥à¥³¡¼¥ë adjtimex() ¤Ï¤³¤Î¥¢¥ë¥´¥ê¥º¥à¤ÎÄ´Àá¤Î¥Ñ¥é¥á¡¼¥¿¡¼¤òÆɤ߼è¤Ã¤¿¤ê¡¢ÀßÄꤷ¤¿¤ê¤¹¤ë¡£ ¤³¤Î´Ø¿ô¤Ï timex ¹½Â¤ÂΤؤΥݥ¤¥ó¥¿¡¼¤ò¼õ¤±¼è¤ê¡¢¤½¤ÎÃͤǥ«¡¼¥Í¥ë¤Î¥Ñ¥é¥á¡¼¥¿¡¼¤ò¹¹¿·¤·¤Æ¡¢ Ʊ¤¸¹½Â¤ÂΤ˸½ºß¤Î¥«¡¼¥Í¥ë¤ÎÃͤòÊÖ¤¹¡£ ¤³¤Î¹½Â¤ÂΤϰʲ¼¤Î¤è¤¦¤ËÀë¸À¤µ¤ì¤ë:-
struct timex { int modes; /* mode selector */ long offset; /* time offset (usec) */ long freq; /* frequency offset (scaled ppm) */ long maxerror; /* maximum error (usec) */ long esterror; /* estimated error (usec) */ int status; /* clock command/status */ long constant; /* pll time constant */ long precision; /* clock precision (usec) (read only) */ long tolerance; /* clock frequency tolerance (ppm) (read only) */ struct timeval time; /* current time (read only) */ long tick; /* usecs between clock ticks */ };
modes ¥Õ¥£¡¼¥ë¥É¤Ï (ɬÍפ˱þ¤¸¤Æ) ¤É¤Î¥Ñ¥é¥á¡¼¥¿¡¼¤òÀßÄꤹ¤ë¤«·èÄꤹ¤ë¡£ ¤½¤ì¤Ï°Ê²¼¤Î¥Ó¥Ã¥ÈÃͤΠ0 ¸Ä°Ê¾å¤Î ¥Ó¥Ã¥È OR ¤«¤é¤Ê¤ë:
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#define ADJ_OFFSET 0x0001 /* time offset */ #define ADJ_FREQUENCY 0x0002 /* frequency offset */ #define ADJ_MAXERROR 0x0004 /* maximum time error */ #define ADJ_ESTERROR 0x0008 /* estimated time error */ #define ADJ_STATUS 0x0010 /* clock status */ #define ADJ_TIMECONST 0x0020 /* pll time constant */ #define ADJ_TICK 0x4000 /* tick value */ #define ADJ_OFFSET_SINGLESHOT 0x8001 /* old-fashioned adjtime() */
Ä̾ï¤Î¥æ¡¼¥¶¡¼¤Ï mode ¤ÎÃÍ¤Ï 0 ¤ËÀ©¸Â¤µ¤ì¤Æ¤¤¤ë¡£ ¥¹¡¼¥Ñ¡¼¡¦¥æ¡¼¥¶¡¼¤Î¤ß¤¬Á´¤Æ¤Î¥Ñ¥é¥á¡¼¥¿¡¼¤òÀßÄê¤Ç¤¤ë¡£
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À®¸ù¤·¤¿¾ì¹ç¡¢ adjtimex() ¤Ï ¥¯¥í¥Ã¥¯¤Î¾õÂÖ¤òÊÖ¤¹:-
#define TIME_OK 0 /* clock synchronized */ #define TIME_INS 1 /* insert leap second */ #define TIME_DEL 2 /* delete leap second */ #define TIME_OOP 3 /* leap second in progress */ #define TIME_BAD 4 /* clock not synchronized */
¼ºÇÔ¤·¤¿¾ì¹ç¤Ï adjtimex() ¤Ï -1 ¤òÊÖ¤·¡¢ errno ¤¬ÀßÄꤵ¤ì¤ë¡£
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- EFAULT
- buf ¤¬½ñ¤¹þ¤ß²Äǽ¤Ê¥á¥â¥ê¤ò»Ø¤·¤Æ¤¤¤Ê¤¤¡£
- EINVAL
- buf.offset ¤Ø -131071 ¡Á +131071 ¤ÎÈϰϰʳ°¤ÎÃͤòÀßÄꤷ¤è¤¦¤È¤·¤¿¤«¡¢ buf.status ¤Ë¾åµ°Ê³°¤ÎÃͤòÀßÄꤷ¤è¤¦¤È¤·¤¿¤«¡¢ buf.tick ¤Ë 900000/HZ ¡Á 1100000/HZ ¤ÎÈϰϰʳ°¤ÎÃͤòÀßÄꤷ¤è¤¦¤È¤·¤¿¡£ ¤³¤³¤Ç HZ ¤Ï¥·¥¹¥Æ¥à¤Î¥¿¥¤¥Þ¡¼³ä¤ê¹þ¤ß¤Î¼þ´ü¤Ç¤¢¤ë¡£
- EPERM
- buf.mode ¤¬ 0 ¤Ç¤Ê¤¯¡¢¤«¤Ä¸Æ¤Ó½Ð¤·¸µ¤¬½½Ê¬¤ÊÆø¢¤ò»ý¤Ã¤Æ¤¤¤Ê¤¤¡£ Linux ¤Ç¤Ï CAP_SYS_TIME ¥±¡¼¥Ñ¥Ó¥ê¥Æ¥£¤¬É¬ÍפǤ¢¤ë¡£
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adjtimex() ¤Ï Linux ÆÃͤǤ¢¤ê¡¢ °Ü¿¢¤ò°Õ¿Þ¤·¤¿¥×¥í¥°¥é¥à¤Ç»ÈÍѤ¹¤Ù¤¤Ç¤Ï¤Ê¤¤¡£ ¥·¥¹¥Æ¥à¥¯¥í¥Ã¥¯¤òÄ´À°¤¹¤ëÊýË¡¤Ç¡¢ °Ü¿¢À¤¬¤¢¤ë¤¬¼«Í³ÅÙ¤ÏÎô¤ëÊýË¡¤Ë¤Ä¤¤¤Æ¤Ï adjtime(3) ¤ò»²¾È¤Î¤³¤È¡£´ØÏ¢¹àÌÜ
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