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ntp_gettime —

NTP ?桼?????ץꥱ???????󥤥󥿥ե?????

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<sys/timex.h> int ntp_gettime(struct ntptimeval *ntv)

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ntp_gettime() ?ˤ??ä??֤??????????ϡ? timespec ??¤?Τ˳?Ǽ?????ޤ??????ޥ??????? (?äȥޥ???????) ?ޤ??? ?ʥ??? (?äȥʥ???) ?Τɤ??餫?η????Ǥ??뤳?Ȥ??Ǥ??ޤ??? ??????????ͭ?η????ϡ? ntp_adjtime() ?????ƥॳ?????ˤ??ä??֤????? status ??ɤ? STA_NANO ?ӥåȤˤ??äƷ??ꤵ???ޤ??? ntp_gettime() ?ϰʲ??Υ????Ф????? ntptimeval ??¤?ΤؤΥݥ??󥿤??????Ȥ??ƻ????ޤ?:

struct ntptimeval {
	struct timespec time;	/* ???ߤλ??? (ns) (ro) */
	long maxerror;		/* ???????? (us) (ro) */
	long esterror;		/* ???????? (us) (ro) */
	long tai;		/* TAI-UTC ???ե??å? */
	int time_state;		/* ???־??? */
};

???????ϰʲ??Τ褦?????򤵤??ޤ?:

time: ???ߤλ????Ǥ? (?ɼ???????)??
maxerror: ?ޥ???????ñ?̤Ǥκ????????Ǥ? (?ɼ???????)??
esterror: ?ޥ???????ñ?̤Ǥο????????Ǥ? (?ɼ???????)??
tai: TAI ?????? UTC ?λ??֥????????δ֤???ñ?̤Υ??ե??åȤǤ??? ???Υ??ե??åȤ? 1 ǯ???? 2 ??ȯ?Ԥ??졢 TAI (???ä??ʤ?) ?? UTC (???ä?????) ?Ȥδ֤??????ú??Ǥ??? ntpd(8) ?ޤ??Ϥ???¾?Υ??????????Ȥ??????ͤ????????ޤ??? ?? 0 ??????????̣???ޤ??? ???Υޥ˥奢???ڡ????????դǤϡ????Υ??ե??åȤ? 32 ?äǤ???
time_state: ???߻????ξ??֤Ǥ???

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The ntp_gettime() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate the error.

?????ꤦ?륯???å??ξ??֤ϰʲ??ΤȤ????Ǥ?:

TIME_OK: ???Ƥ? OK ?ǡ????äηٹ??⤢???ޤ?????
TIME_INS: ???α??äηٹ??Ǥ??? ???????κǸ??? 23:59:59 ?θ????ɲä? 1 ?ä??????????ޤ???
TIME_DEL: ???α??äηٹ??Ǥ??? ???????κǸ??? 23:59:59 ?ϥ????åפ????ޤ???
TIME_OOP: ???äηв????Ǥ???
TIME_WAIT: ???ä?ȯ?????ޤ?????
TIME_ERROR: ?????å???Ʊ?????Ƥ??ޤ?????

??Ϣ????

ntp_adjtime(2), ntpd(8)

http://www.bipm.fr/enus/5_Scientific/c_time/time_1.html
http://www.boulder.nist.gov/timefreq/general/faq.htm
ftp://time.nist.gov/pub/leap-seconds.list

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???Υޥ˥奢???ڡ????? Tom Rhodes ⟨trhodes@FreeBSD.org⟩ ???񤭤ޤ?????