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boottime, time_second, time_uptime — ?????ƥ??????ѿ?

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<sys/time.h>

• extern struct timeval boottime;
• extern struct time_t time_second;
• extern struct timeval time_uptime;

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boottime ?ѿ??ϥ????ƥ??Υ֡??Ȼ??????ݻ????ޤ???

time_second ?ѿ??ϥ????ƥ??? “??????” ?????å? (??) ?Ǥ???

time_uptime ?ѿ??ϡ??֡??Ȥ??Ƥ??????ÿ??Ǥ???

bintime(9), getbintime(9), microtime(9), getmicrotime(9), nanotime(9), getnanotime(9) ?ؿ??ϡ????߻????????????Τˡ??Բ?ʬ?˼??????뤳?Ȥ??Ǥ??ޤ??? Ʊ?ͤ? binuptime(9), getbinuptime(9), microuptime(9), getmicrouptime(9), nanouptime(9), getnanouptime(9) ?ؿ??ϡ??֡??Ȥ??Ƥ????ηв????֤????????Τˡ??Բ?ʬ?˼??????뤳?Ȥ??Ǥ??ޤ??? boottime ?ѿ??ϡ????̤ʷٲ??ʤ????ɤ߽񤭤??뤳?Ȥ??Ǥ??ޤ???

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clock_settime(2), ntp_adjtime(2), settimeofday(2), getbintime(9), getbinuptime(9), getmicrotime(9), getmicrouptime(9), getnanotime(9), getnanouptime(9), bintime(9), binuptime(9), microtime(9), microuptime(9), nanotime(9,) nanouptime(9) Poul-Henning Kamp, Timecounters: Efficient and precise timekeeping in SMP kernels, Proceedings of EuroBSDCon 2002, Amsterdam, /usr/share/doc/papers/timecounter.ascii.gz. Marshall Kirk McKusick and George V. Neville-Neil, The Design and Implementation of the FreeBSD Operating System, Addison-Wesley, 57-61,65-66, July 2004.