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GETTIMEOFDAY
Section: Linux Programmer's Manual (2)Updated: 1997-12-10
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gettimeofday, settimeofday - »þ´Ö¤ò¼èÆÀ/ÀßÄꤹ¤ë½ñ¼°
#include <sys/time.h>
int gettimeofday(struct timeval *tv, struct timezone *tz);
int settimeofday(const struct timeval *tv
, const struct timezone *tz);
ÀâÌÀ
gettimeofday ¤È settimeofday ¤Ï»þ´Ö¤È¥¿¥¤¥à¥¾¡¼¥ó (timezone) ¤ò¼èÆÀ¤Þ¤¿¤ÏÀßÄꤹ¤ë¡£ tv ¤Ï /usr/include/sys/time.h ¤ËÄêµÁ¤µ¤ì¤Æ¤¤¤ë timeval ¹½Â¤ÂΤǤ¢¤ë:
struct timeval {
long tv_sec; /* seconds */
long tv_usec; /* microseconds */
};
¤½¤·¤Æ tz ¤Ï timezone ¹½Â¤ÂΤǤ¢¤ë:
struct timezone {
int tz_minuteswest; /* minutes W of Greenwich */
int tz_dsttime; /* type of dst correction */
};
timezone ¹½Â¤ÂΤλÈÍѤÏÇÑ»ß (obsolete) ¤µ¤ì¤¿¡£ tz_dsttime ¥Õ¥£¡¼¥ë¥É¤Ï Linux ¤Ç¤Ï»ÈÍѤµ¤ì¤Ê¤¤¡£libc ¤ä glibc ¤Ë¤è¤Ã¤Æ ¥µ¥Ý¡¼¥È¤µ¤ì¤ë¤³¤È¤Ï¤Ê¤¤¡£¥«¡¼¥Í¥ë¤Î¥½¡¼¥¹Ãæ¤Ë¤³¤Î¥Õ¥£¡¼¥ë¥É ¤¬Â¸ºß¤¹¤ë¤Î¤ÏÁ´¤Æ¥Ð¥°¤Ç¤¢¤ë¡£¤½¤ì¤é¤Ï½ã¿è¤ËÎò»ËŪ¤Ê¤â¤Î¤Ç¤¢¤ë¡£
tz_dsttime ¥Õ¥£¡¼¥ë¥É¤Ï (°Ê²¼¤ÇÍ¿¤¨¤é¤ì¤ë¤è¤¦¤Ê) ¥·¥ó¥Ü¥ëÄê¿ô¤ò³ÊǼ¤·¤Æ¤¤¤ë¡£ ¤³¤ì¤Ï°ìǯ¤Î¤¦¤Á¤Ç¤¤¤Ä²Æ»þ´Ö (Daylight Savings Time) ¤ò¼Â»Ü¤¹¤ë¤«¤ò¼¨¤·¤Æ¤¤¤ë¡£ (Ãí°Õ: ¤½¤ÎÃͤÏǯ´Ö¤ÎÄê¿ô¤Ç DST ¤ò¼Â»Ü¤¹¤ë¤³¤È¤ò»Ø¼¨¤·¤Æ¤¤¤ë¤ï¤±¤Ç¤Ï¤Ê¤¯¡¢ ¥¢¥ë¥´¥ê¥º¥à¤òÁªÂò¤·¤Æ¤¤¤ë¡£) ²Æ»þ´Ö (daylight savings times) ¤Ï°Ê²¼¤Î¤è¤¦¤ËÄêµÁ¤µ¤ì¤ë:
DST_NONE /* not on dst */
DST_USA /* USA style dst */
DST_AUST /* Australian style dst */
DST_WET /* Western European dst */
DST_MET /* Middle European dst */
DST_EET /* Eastern European dst */
DST_CAN /* Canada */
DST_GB /* Great Britain and Eire */
DST_RUM /* Rumania */
DST_TUR /* Turkey */
DST_AUSTALT /* Australian style with shift in 1986 */
¤â¤Á¤í¤ó¡¢¤É¤Î´ü´Ö¤Ë²Æ»þ´Ö¤ò¼Â»Ü¤¹¤ë¤«¤Ë¤Ïñ½ã¤Ê¥¢¥ë¥´¥ê¥º¥à¤Ï¸ºß¤»¤º¡¢ ¹ñ¤´¤È¤Ë°Û¤Ã¤Æ¤¤¤ë¡£ ¼ÂºÝ¤Ë¤³¤Î´ü´Ö¤ÏͽÃΤǤ¤Ê¤¤À¯¼£Åª¤Ê·èÄê¤Ç¤¢¤ë¡£ ¤½¤ì¤Ç¤³¤Î¥¿¥¤¥à¡¦¥¾¡¼¥ó¤Îɽ¸½ÊýË¡¤ÏÊü´þ¤µ¤ì¤¿¡£ Linux ¤Ë¤ª¤¤¤Æ¡¢ settimeofday ¥³¡¼¥ë¤Ï tz_dsttime ¥Õ¥£¡¼¥ë¥É¤Ë¤Ï¥¼¥í¤Ë¤¹¤ëɬÍפ¬¤¢¤ë¡£
Linux ¤Ë¤ª¤¤¤ÆÆÈÆäΡ֥¯¥í¥Ã¥¯¤Î¥º¥ì (warp clock)¡×¤¬ settimeofday ¥·¥¹¥Æ¥à¡¦¥³¡¼¥ë¤Ë´ØÏ¢¤·¤Æ¸ºß¤¹¤ë¡£ ¤³¤ì¤Ï (¥Ö¡¼¥È¸å¤Î) ºÇ½é¤Î¥³¡¼¥ë¤Ç tz °ú¤¿ô¤¬ NULL ¤Ç¤Ê¤¯¡¢ tv °ú¤¿ô¤¬ NULL ¤Ç tz_minuteswest ¥Õ¥£¡¼¥ë¥É¤¬¥¼¥í¤Ç¤Ê¤¤¾ì¹ç¤Ë¤ª¤³¤ë¡£ ¤³¤Î¤è¤¦¤Ê¾ì¹ç¡¢CMOS ¥¯¥í¥Ã¥¯¤ÏÃÏÊý»þ (local time) ¤Ç¤¢¤ë¤È¤ß¤Ê¤·¡¢ UTC ¥·¥¹¥Æ¥à»þ´Ö¤òÆÀ¤ë¤¿¤á¤Ë¡¢¤³¤Î»þ´Ö¤òÁý²Ã¤µ¤»¤ë¡£ ¤³¤Î»ÅÍͤò»È¤¦¤³¤È¤Ï¤ª¤½¤é¤¯Îɤ¤¹Í¤¨¤Ç¤Ï¤Ê¤¤¤À¤í¤¦¡£
timeval ¹½Â¤ÂΤòÁàºî¤¹¤ë¤¿¤á¤Ë°Ê²¼¤Î¥Þ¥¯¥í (macro) ¤¬ÄêµÁ¤µ¤ì¤Æ¤¤¤ë :
#define timerisset(tvp)\
((tvp)->tv_sec || (tvp)->tv_usec) #define timercmp(tvp, uvp, cmp)\ ((tvp)->tv_sec cmp (uvp)->tv_sec ||\ (tvp)->tv_sec == (uvp)->tv_sec &&\ (tvp)->tv_usec cmp (uvp)->tv_usec)
#define timerclear(tvp)\
((tvp)->tv_sec = (tvp)->tv_usec = 0)
tv ¤Þ¤¿¤Ï tz ¤Î¤É¤Á¤é¤«¤¬ NULL ¤Ê¤é¤Ð¡¢Âбþ¤¹¤ë¹½Â¤ÂΤÏÀßÄꤵ¤ì¤Ê¤¤¤«ÊÖ¤µ¤ì¤Ê¤¤¡£
¥¹¡¼¥Ñ¡¼¡¦¥æ¡¼¥¶¡¼¤Î¤ß¤¬ settimeofday ¤ò»ÈÍѤǤ¤ë¡£
ÊÖ¤êÃÍ
gettimeofday ¤È settimeofday ¤ÏÀ®¸ù¤¹¤ë¤È¥¼¥í¤òÊÖ¤·¡¢¼ºÇÔ¤·¤¿¾ì¹ç¤Ï -1 ¤òÊÖ¤¹ (¤³¤Î¾ì¹ç¤Ï errno ¤¬Å¬ÀÚ¤ËÀßÄꤵ¤ì¤ë)¡£¥¨¥é¡¼
- EPERM
- settimeofday ¤¬¥¹¡¼¥Ñ¡¼¡¦¥æ¡¼¥¶¡¼°Ê³°¤«¤é¸Æ¤Ó½Ð¤µ¤ì¤¿¡£
- EINVAL
- ¥¿¥¤¥à¥¾¡¼¥ó (¤Þ¤¿¤Ï¾¤Î²¿¤«) ¤¬ÉÔÀµ¤Ç¤¢¤ë¡£
- EFAULT
- tv ¤« tz ¤Î¤É¤Á¤é¤«¤¬¥¢¥¯¥»¥¹²Äǽ¤Ê¥¢¥É¥ì¥¹¶õ´Ö¤Î³°Éô¤ò»Ø¤·¤Æ¤¤¤ë¡£
½àµò
SVr4, BSD 4.3´ØÏ¢¹àÌÜ
date(1), adjtimex(2), time(2), ctime(3), ftime(3)