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2006-11-26 (fedora - 25/11/07)

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rtc - ¥ê¥¢¥ë¥¿¥¤¥à¥¯¥í¥Ã¥¯

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#include <linux/rtc.h>

int ioctl(fd, RTC_request, param);

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¤³¤ì¤Ï¥ê¥¢¥ë¥¿¥¤¥à¥¯¥í¥Ã¥¯ (RTC) ¤Î¥É¥é¥¤¥Ð¤Î¥¤¥ó¥¿¥Õ¥§¡¼¥¹¤Ç¤¢¤ë¡£

Á´¤Æ¤Î x86 PC ¤È ACPI ¥Ù¡¼¥¹¤Î¥·¥¹¥Æ¥à¤Ë¤Ï RTC ¤¬¤¢¤ë¡£ ¤³¤Î RTC ¤Ï¡¢¸µ¡¹¤Î PC/AT ¤ËÂ¸ºß¤·¤¿ Motorola MC146818 ¥Á¥Ã¥×¤È¸ß´¹À¤¬¤¢¤ë¡£ ¤³¤Î¤è¤¦¤Ê RTC ¤Ï¡¢º£Æü¤Ç¤Ï¥Þ¥¶¡¼¥Ü¡¼¥É¤Î ¥Á¥Ã¥×¥»¥Ã¥È (¥µ¥¦¥¹¥Ö¥ê¥Ã¥¸) Æâ¤Ç¼ÂÁõ¤µ¤ì¤Æ¤¤¤ë¤³¤È¤¬Â¿¤¯¡¢ ¸ò´¹²ÄÇ½¤Ê¹Å²ß¤¯¤é¤¤¤ÎÂç¤¤µ¤Î¥Ð¥Ã¥¯¥¢¥Ã¥×ÅÅÃÓ¤ò»È¤Ã¤Æ¤¤¤ë¡£

¥·¥¹¥Æ¥à¥ª¥ó¥Á¥Ã¥× (system-on-chip) ¥×¥í¥»¥Ã¥µ¤ò»È¤Ã¤Æºî¤é¤ì¤¿ ÁÈ¤ß¹þ¤ß¥·¥¹¥Æ¥à¤È¤¤¤Ã¤¿¡¢PC °Ê³°¤Î¥·¥¹¥Æ¥à¤Ç¤Ï¡¢ÊÌ¤Ê¼ÂÁõ¤òÍÑ¤¤¤Æ¤¤¤ë¡£ ¤³¤Î¤è¤¦¤Ê¥·¥¹¥Æ¥à¤Ç¤Ï¡¢PC/AT ¤Î RTC ¤ÈÆ±¤¸µ¡Ç½¤òÄó¶¡¤·¤Æ¤¤¤Ê¤¤¾ì¹ç¤¬Â¿¤¤¡£

RTC ¤È¥·¥¹¥Æ¥à¥¯¥í¥Ã¥¯¤Î°ã¤¤

RTC ¤ò¥·¥¹¥Æ¥à¥¯¥í¥Ã¥¯¤Èº®Æ±¤¹¤Ù¤¤Ç¤Ï¤Ê¤¤¡£ ¥·¥¹¥Æ¥à¥¯¥í¥Ã¥¯¤Ï¡¢¥«¡¼¥Í¥ë¤Ë´ÉÍý¤µ¤ì¤ë¥½¥Õ¥È¥¦¥§¥¢¥¯¥í¥Ã¥¯¤Ç¤¢¤ê¡¢ ¥Õ¥¡¥¤¥ë¤Ë¤è¤ë¥¿¥¤¥à¥¹¥¿¥ó¥×ÀßÄê¤Ê¤É¤È¤È¤â¤Ë¡¢ gettimeofday(2) ¤ä time(2) ¤ò¼ÂÁõ¤¹¤ë¤Î¤Ë»ÈÍÑ¤µ¤ì¤Æ¤¤¤ë¡£ ¥·¥¹¥Æ¥à¥¯¥í¥Ã¥¯¤Ï¡¢POSIX ¤Ë¤ª¤±¤ëµª¸µ (Epoch): Jan 1, 1970, 0:00 UTC ¤ÇÄêµÁ¤µ¤ì¤¿³«»Ï»þÅÀ¤«¤é¤ÎÉÃ¤È¥ß¥êÉÃ¤òÉ½¤¹¡£ 1 ¤Ä¤Î°ìÈÌÅª¤Ê¼ÂÁõ¤Ç¤Ï¥¿¥¤¥Þ¡¼³ä¤ê¹þ¤ß¤ò¡¢"jiffy" Ëè¤Ë 1 ²ó¡¢ 100, 250, 1000 Hz ¤È¤¤¤¦¼þÇÈ¿ô¤Ç¥«¥¦¥ó¥È¤¹¤ë¡£

RTC ¤È¥·¥¹¥Æ¥à¥¯¥í¥Ã¥¯¤Î½ÅÍ×¤Ê°ã¤¤¤Ï¡¢ RTC ¤Ï¥·¥¹¥Æ¥à¤¬ÄãÅÅÎÏ¾õÂÖ (¡Ö¥ª¥Õ¡×¤Î¾ì¹ç¤â´Þ¤à) ¤Ç¤âÆ°ºî¤¹¤ë¤Î¤ËÂÐ¤·¡¢ ¥·¥¹¥Æ¥à¥¯¥í¥Ã¥¯¤ÏÆ°ºî¤·¤Ê¤¤ÅÀ¤Ç¤¢¤ë¡£ ¥·¥¹¥Æ¥à¥¯¥í¥Ã¥¯¤Ï¡¢½é´ü²½¤¬¹Ô¤ï¤ì¤ë¤Þ¤Ç¤Ï¡¢ POSIX µª¸µ¤«¤é¤Ç¤Ï¤Ê¤¯¥·¥¹¥Æ¥à¤Î¥Ö¡¼¥È»þ¤«¤é¤Î»þ¹ï¤·¤«ÊÖ¤»¤Ê¤¤¡£ ¤½¤Î¤¿¤á¡¢¥Ö¡¼¥È»þ¤ä¥·¥¹¥Æ¥à¤ÎÄãÅÅÎÏ¾õÂÖ¤«¤é¤ÎÉüµ¢ (resume) ¸å¤Ë¤Ï¡¢ ¥·¥¹¥Æ¥à¥¯¥í¥Ã¥¯¤Ï RTC ¤ò»È¤Ã¤Æ¸½ºß¤ÎÊÉ»þ·×»þ¹ï¤ËÀßÄê¤µ¤ì¤ë¾ì¹ç¤¬Â¿¤¤¡£ RTC ¤ò»ý¤¿¤Ê¤¤¥·¥¹¥Æ¥à¤Ç¤Ï¡¢ Â¾¤Î»þ·×¤ò»È¤Ã¤Æ¥·¥¹¥Æ¥à¥¯¥í¥Ã¥¯¤òÀßÄê¤¹¤ëÉ¬Í×¤¬¤¢¤ê¡¢ ¥Í¥Ã¥È¥ï¡¼¥¯¤Ë¥¢¥¯¥»¥¹¤·¤¿¤ê¡¢(»þ¹ï) ¥Ç¡¼¥¿¤ò¼êÆ°¤ÇÆþÎÏ¤·¤¿¤ê¤¹¤ë¤À¤í¤¦¡£

RTC ¤Îµ¡Ç½

RTC ¤Ï hwclock(8) ¤Þ¤¿¤Ï²¼µ¤Î ioctl ¥ê¥¯¥¨¥¹¥È¤ÇÆÉ¤ß½ñ¤¤¬¤Ç¤¤ë¡£

*: ¥¯¥í¥Ã¥¯¤Î¹¹¿·Ëè (¤Ä¤Þ¤ê 1 ÉÃËè)¡£
*: 2 Hz ¤«¤é 8192 Hz ¤Þ¤Ç¤Î 2 ¤Î¾è¿ô¤Î¼þÇÈ¿ô¤Ç¡¢Äê´üÅª¤Ê´Ö³Ö¡£
*: Á°¤â¤Ã¤Æ»ØÄê¤·¤¿¥¢¥é¡¼¥à»þ¹ï¤ËÃ£¤·¤¿»þ¡£

¤³¤ì¤é¤Î³ä¤ê¹þ¤ß¸µ¤Ï¡¢¸ÄÊÌ¤ËÍ¸ú¤Ë¤·¤¿¤êÌµ¸ú¤Ë¤·¤¿¤ê¤Ç¤¤ë¡£ Â¿¤¯¤Î¥·¥¹¥Æ¥à¤Ç¤Ï¡¢¥¢¥é¡¼¥à³ä¤ê¹þ¤ß¤ò¥·¥¹¥Æ¥à¤Î ¥¦¥§¥¤¥¯¥¢¥Ã¥×¥¤¥Ù¥ó¥È¤È¤·¤ÆÀßÄê¤Ç¤¤ë¡£ ¤³¤Î¥¤¥Ù¥ó¥È¤Ï¡¢RAM ¤Ø¤Î¥µ¥¹¥Ú¥ó¥É (STR, ACPI ¥·¥¹¥Æ¥à¤Ç S3 ¤È¸Æ¤Ð¤ì¤ë) ¤ä ¥Ï¥¤¥Ð¡¼¥Í¡¼¥·¥ç¥ó (ACPI ¥·¥¹¥Æ¥à¤Ç S4 ¤È¸Æ¤Ð¤ì¤ë) ¤È¤¤¤Ã¤¿ÄãÅÅÎÏ¾õÂÖ¤ä¡¢ ¡Ö¥ª¥Õ¡×(ACPI ¥·¥¹¥Æ¥à¤Ç S5 ¤È¸Æ¤Ð¤ì¤ë) ¤«¤é¤Ç¤â¡¢¥·¥¹¥Æ¥à¤òÉüµ¢¤Ç¤¤ë¡£ ÅÅÃÓ¤Ç¥Ð¥Ã¥¯¥¢¥Ã¥×¤µ¤ì¤¿ RTC ¤¬³ä¤ê¹þ¤ß¤òÈ¯À¸¤Ç¤¤ë¥·¥¹¥Æ¥à¤È¡¢ ¤Ç¤¤Ê¤¤¥·¥¹¥Æ¥à¤¬¤¢¤ë¡£

/dev/rtc (¤Þ¤¿¤Ï /dev/rtc0, /dev/rtc1 ¤Ê¤É¤Î) ¥Ç¥Ð¥¤¥¹¤Ï (¥¯¥í¡¼¥º¤µ¤ì¤ë¤Þ¤Ç) 1 ²ó¤·¤«¥ª¡¼¥×¥ó¤¹¤ë¤³¤È¤¬¤Ç¤¤º¡¢ ÆÉ¤ß¹þ¤ßÀìÍÑ¤Ç¤¢¤ë¡£ read(2) ¤È select(2) ¤ò¸Æ¤Ó½Ð¤·¤¿¥×¥í¥»¥¹¤Ï¡¢ RTC ¤«¤é¤Î³ä¤ê¹þ¤ß¤ò¼õ¤±¼è¤ë¤Þ¤ÇÄä»ß (block) ¤µ¤ì¤ë¡£ ³ä¤ê¹þ¤ß¤Î¸å¡¢¥×¥í¥»¥¹¤Ï long ·¿À°¿ô¤òÆÉ¤ß½Ð¤¹¤³¤È¤¬¤Ç¤¤ë¡£ ¤³¤ÎÀ°¿ô¤ÎºÇ²¼°Ì¥Ð¥¤¥È¤ÏÈ¯À¸¤·¤¿³ä¤ê¹þ¤ß¤Î¼ïÊÌ¤ò ¥³¡¼¥É²½¤·¤¿¥Ó¥Ã¥È¥Þ¥¹¥¯¤Ç¤¢¤ê¡¢ »Ä¤ê¤Î 3 ¥Ð¥¤¥È¤ÏºÇ¸å¤Î read(2) °Ê¹ß¤ËÈ¯À¸¤·¤¿³ä¤ê¹þ¤ß¤Î²ó¿ô¤Ç¤¢¤ë¡£

ioctl(2) ¥¤¥ó¥¿¥Õ¥§¡¼¥¹

°Ê²¼¤Î ioctl(2) ¥ê¥¯¥¨¥¹¥È¤¬ RTC ¥Ç¥Ð¥¤¥¹¤ÎÀÜÂ³¤µ¤ì¤¿ ¥Õ¥¡¥¤¥ë¥Ç¥£¥¹¥¯¥ê¥×¥¿¤ËÂÐ¤·¤ÆÄêµÁ¤µ¤ì¤Æ¤¤¤ë:

RTC_RD_TIME: RTC ¤Î»þ¹ï¤ò°Ê²¼¤Î¹½Â¤ÂÎ¤ÇÊÖ¤¹:


struct rtc_time {

    int tm_sec;

    int tm_min;

    int tm_hour;

    int tm_mday;

    int tm_mon;

    int tm_year;

    int tm_wday;     /* Ì¤»ÈÍÑ */

    int tm_yday;     /* Ì¤»ÈÍÑ */

    int tm_isdst;    /* Ì¤»ÈÍÑ */

};

¤³¤Î¹½Â¤ÂÎ¤Î¥Õ¥£¡¼¥ë¥É¤Ï gmtime(3) ¤ÇÀâÌÀ¤µ¤ì¤Æ¤¤¤ë tm ¹½Â¤ÂÎ¤Î¥Õ¥£¡¼¥ë¥É¤ÈÆ±¤¸°ÕÌ£¤ÇÆ±¤¸ÈÏ°Ï¤Ç¤¢¤ë¡£ ¤³¤Î¹½Â¤ÂÎ¤Ø¤Î¥Ý¥¤¥ó¥¿¤ò ioctl(2) ¤ÎÂè 3 °ú¤¿ô¤È¤·¤ÆÅÏ¤¹¡£
RTC_SET_TIME: ioctl(2) ¤ÎÂè 3 °ú¤¿ô¤¬»Ø¤¹ rtc_time ¹½Â¤ÂÎ¤ÎÃÍ¤ò RTC »þ¹ï¤ËÀßÄê¤¹¤ë¡£ RTC »þ¹ï¤ÎÀßÄê¤¹¤ë¾ì¹ç¡¢¥×¥í¥»¥¹¤ÏÆÃ¸¢ (¤Ä¤Þ¤ê CAP_SYS_TIME ¥±¡¼¥Ñ¥Ó¥ê¥Æ¥£) ¤ò»ý¤¿¤Ê¤±¤ì¤Ð¤Ê¤é¤Ê¤¤¡£
RTC_ALM_READ, RTC_ALM_SET: ¥¢¥é¡¼¥à¤¬¥µ¥Ý¡¼¥È¤µ¤ì¤Æ¤¤¤ë RTC ¤ËÂÐ¤·¤Æ¡¢ ¥¢¥é¡¼¥à»þ¹ï¤ÎÆÉ¤ß¹þ¤ß¤ÈÀßÄê¤ò¹Ô¤¦¡£ ¥¢¥é¡¼¥à³ä¤ê¹þ¤ß¤Ï¡¢ RTC_AIE_ON, RTC_AIE_OFF ¤ò»È¤Ã¤Æ¡¢¤³¤ì¤È¤ÏÊÌ¤ËÍ¸ú¤Þ¤¿¤ÏÌµ¸ú¤Ë¤·¤Ê¤±¤ì¤Ð¤Ê¤é¤Ê¤¤¡£ ioctl(2) ¤ÎÂè 3 °ú¤¿ô¤Ï¡¢ rtc_time ¹½Â¤ÂÎ¤Ø¤Î¥Ý¥¤¥ó¥¿¤Ç¤Ê¤±¤ì¤Ð¤Ê¤é¤Ê¤¤¡£ ¤³¤Î¹½Â¤ÂÎ¤Î tm_sec, tm_min, tm_hour ¥Õ¥£¡¼¥ë¥É¤Î¤ß¤¬»ÈÍÑ¤µ¤ì¤ë¡£
RTC_IRQP_READ, RTC_IRQP_SET: ¼þ´üÅª¤Ê³ä¤ê¹þ¤ß¤¬¥µ¥Ý¡¼¥È¤µ¤ì¤Æ¤¤¤ë RTC ¤ËÂÐ¤·¤Æ¡¢ ¼þ´üÅª¤Ê³ä¤ê¹þ¤ß¤Î¼þÇÈ¿ô¤ÎÆÉ¤ß¹þ¤ß¤ÈÀßÄê¤ò¹Ô¤¦¡£ ¼þ´üÅª¤Ê³ä¤ê¹þ¤ß¤Ï¡¢ RTC_PIE_ON, RTC_PIE_OFF ¤ò»È¤Ã¤Æ¡¢¤³¤ì¤È¤ÏÊÌ¤ËÍ¸ú¤Þ¤¿¤ÏÌµ¸ú¤Ë¤·¤Ê¤±¤ì¤Ð¤Ê¤é¤Ê¤¤¡£ ioctl(2) ¤ÎÂè 3 °ú¤¿ô¤Ï¡¢¤½¤ì¤¾¤ì unsigned long * ¤È unsigned long ¤Ç¤¢¤ë¡£ ¤³¤ÎÃÍ¤Ï 1 ÉÃÅö¤¿¤ê¤Î³ä¤ê¹þ¤ß¤Î²ó¿ô¤Ç¤¢¤ë¡£ »ØÄê²ÄÇ½¤Ê¼þÇÈ¿ô¤Ï¡¢2 ¤Î¾è¿ô¤Ç 2 ¤«¤é 8192 ¤ÎÈÏ°Ï¤Ç¤¢¤ë¡£ ÆÃ¸¢¥×¥í¥»¥¹ (¤Ä¤Þ¤ê CAP_SYS_RESOURCE ¥±¡¼¥Ñ¥Ó¥ê¥Æ¥£¤ò»ý¤Ä¥×¥í¥»¥¹) ¤Î¤ß¤¬¡¢ /proc/sys/dev/rtc/max-user-freq ¤Ë½ñ¤«¤ì¤¿¾åµ¤Î¼þÇÈ¿ô¤òÀßÄê¤Ç¤¤ë¡£ (¤³¤Î¥Õ¥¡¥¤¥ë¤Ë¤Ï¥Ç¥Õ¥©¥ë¥È¤Ç 64 ¤È¤¤¤¦ÃÍ¤¬½ñ¤«¤ì¤Æ¤¤¤ë)¡£
RTC_AIE_ON, RTC_AIE_OFF: ¥¢¥é¡¼¥à¤¬¥µ¥Ý¡¼¥È¤µ¤ì¤Æ¤¤¤ë RTC ¤ËÂÐ¤·¤Æ¡¢ ¥¢¥é¡¼¥à³ä¤ê¹þ¤ß¤òÍ¸ú¤Þ¤¿¤ÏÌµ¸ú¤Ë¤¹¤ë¡£ ioctl(2) ¤ÎÂè 3 °ú¤¿ô¤ÏÌµ»ë¤µ¤ì¤ë¡£
RTC_UIE_ON, RTC_UIE_OFF: 1 ÉÃËè¤Î³ä¤ê¹þ¤ß¤¬¥µ¥Ý¡¼¥È¤µ¤ì¤Æ¤¤¤ë RTC ¤ËÂÐ¤·¤Æ¡¢ ¥¯¥í¥Ã¥¯¹¹¿·Ëè¤Î³ä¤ê¹þ¤ß¤òÍ¸ú¤Þ¤¿¤ÏÌµ¸ú¤Ë¤¹¤ë¡£ ioctl(2) ¤ÎÂè 3 °ú¤¿ô¤ÏÌµ»ë¤µ¤ì¤ë¡£
RTC_PIE_ON, RTC_PIE_OFF: ¼þ´üÅª¤Ê³ä¤ê¹þ¤ß¤¬¥µ¥Ý¡¼¥È¤µ¤ì¤Æ¤¤¤ë RTC ¤ËÂÐ¤·¤Æ¡¢ ¼þ´üÅª¤Ê³ä¤ê¹þ¤ß¤òÍ¸ú¤Þ¤¿¤ÏÌµ¸ú¤Ë¤¹¤ë¡£ ioctl(2) ¤ÎÂè 3 °ú¤¿ô¤ÏÌµ»ë¤µ¤ì¤ë¡£ ÆÃ¸¢¥×¥í¥»¥¹ (¤Ä¤Þ¤ê CAP_SYS_RESOURCE ¥±¡¼¥Ñ¥Ó¥ê¥Æ¥£¤ò»ý¤Ä¥×¥í¥»¥¹) ¤Î¤ß¤¬¡¢ ¤½¤Î»þÅÀ¤Ç /proc/sys/dev/rtc/max-user-freq ¤Ë¼þ´ü¤¬¾åµ¤ÎÃÍ¤Ë»ØÄê¤µ¤ì¤Æ¤¤¤ë¾ì¹ç¤Ë¡¢ ¼þ´üÅª¤Ê³ä¤ê¹þ¤ß¤òÍ¸ú¤Ë¤Ç¤¤ë¡£
RTC_EPOCH_READ, RTC_EPOCH_SET: Â¿¤¯¤Î RTC ¤ÏÇ¯¤ò 8 ¥Ó¥Ã¥È¤Î¥ì¥¸¥¹¥¿¤Ë¥³¡¼¥É²½¤¹¤ë¡£ Ç¯¤Ï 8 ¥Ó¥Ã¥È¤Î¥Ð¥¤¥Ê¥ê¿ô¤Þ¤¿¤Ï BCD ¿ô¤ËÊÑ´¹¤µ¤ì¤ë¡£ ¤É¤Á¤é¤Î¾ì¹ç¤Ç¤â¡¢¤½¤Î¿ôÃÍ¤Ï RTC ¤Îµª¸µ¤«¤éÁêÂÐÃÍ¤ËÊÑ´¹¤µ¤ì¤ë¡£ Â¿¤¯¤Î¥·¥¹¥Æ¥à¤Ç¤Ï RTC ¤Îµª¸µ¤Ï 1900 ¤Ë½é´ü²½¤µ¤ì¤ë¤¬¡¢ Alpha ¤È MIPS ¤Ç¤Ï¡¢RTC ¥ì¥¸¥¹¥¿¤ÎÇ¯¤ÎÃÍ¤Ë±þ¤¸¤Æ¡¢ 1952, 1980, 2000 ¤Î²¿¤ì¤«¤Ë½é´ü²½¤µ¤ì¤ë¡£ ¤³¤ì¤é¤ÎÁàºî¤Ç¤½¤ì¤¾¤ì RTC ¤Îµª¸µ¤ÎÆÉ¤ß¹þ¤ß¤ÈÀßÄê¤¬²ÄÇ½¤Ê RTC ¤â¤¢¤ë¡£ ioctl(2) ¤ÎÂè 3 °ú¤¿ô¤Ï¡¢¤½¤ì¤¾¤ì unsigned long * ¤È unsigned long ¤Ç¤¢¤ë¡£ ÊÖ¤µ¤ì¤ëÃÍ (¤Þ¤¿¤Ï»ØÄê¤µ¤ì¤ëÃÍ) ¤Ïµª¸µ¤Ç¤¢¤ë¡£ RTC ¤Îµª¸µ¤òÀßÄê¤¹¤ë¾ì¹ç¡¢¥×¥í¥»¥¹¤ÏÆÃ¸¢ (¤Ä¤Þ¤ê CAP_SYS_TIME ¥±¡¼¥Ñ¥Ó¥ê¥Æ¥£) ¤ò»ý¤¿¤Ê¤±¤ì¤Ð¤Ê¤é¤Ê¤¤¡£
RTC_WKALM_RD, RTC_WKALM_SET: RTC ¤ÎÃæ¤Ë¤Ï¤è¤ê¶¯ÎÏ¤Ê¥¢¥é¡¼¥à¥¤¥ó¥¿¥Õ¥§¡¼¥¹¤ò¥µ¥Ý¡¼¥È¤¹¤ë¤â¤Î¤â¤¢¤ê¡¢ ¤³¤ì¤é¤Î ioctl ¤ò»È¤¦¤³¤È¤Ç¡¢°Ê²¼¤Î¤è¤¦¤Ê¹½Â¤ÂÎ¤Ç RTC ¤Î¥¢¥é¡¼¥à»þ¹ï¤ò (¤½¤ì¤¾¤ì) ÆÉ¤ß½ñ¤¤Ç¤¤ë:


struct rtc_wkalrm {

    unsigned char enabled;

    unsigned char pending;

    struct rtc_time time;

};

enabled ¥Õ¥é¥°¤Ï¥¢¥é¡¼¥à³ä¤ê¹þ¤ß¤òÍ¸ú¤Þ¤¿¤ÏÌµ¸ú¤·¤¿¤ê¡¢ ¸½ºß¤Î¾õÂÖ¤òÆÉ¤ß¹þ¤à¤Î¤Ë»ÈÍÑ¤µ¤ì¤ë¡£ ¤³¤ì¤é¤Î¥Õ¥é¥°¤ò»È¤¦¾ì¹ç¡¢ RTC_AIE_ON ¤È RTC_AIE_OFF ¤Ï»ÈÍÑ¤µ¤ì¤Ê¤¤¡£ pending ¥Õ¥é¥°¤Ï RTC_WKALM_RD ¤Ç»ÈÍÑ¤µ¤ì¡¢½èÍýÂÔ¤Á¤Î³ä¤ê¹þ¤ß¤òÉ½¼¨¤¹¤ë (EFI ¥Õ¥¡¡¼¥à¥¦¥§¥¢¤Ç´ÉÍý¤µ¤ì¤ë RTC ¤ÈÄÌ¿®¤¹¤ë¤È¤°Ê³°¡¢ Linux ¤Ç¤Ï¤Û¤È¤ó¤ÉÌò¤ËÎ©¤¿¤Ê¤¤)¡£ time ¥Õ¥£¡¼¥ë¥É¤Ï RTC_ALM_READ ¤ä RTC_ALM_SET ¤Î¾ì¹ç¤ÈÆ±¤¸¤è¤¦¤Ë»ÈÍÑ¤µ¤ì¤ë¤¬¡¢ tm_mday, tm_mon, tm_year ¥Õ¥£¡¼¥ë¥É¤âÍ¸ú¤Ç¤¢¤ë¤È¤¤¤¦ÅÀ¤¬°Û¤Ê¤ë¡£ ¤³¤Î¹½Â¤ÂÎ¤Ø¤Î¥Ý¥¤¥ó¥¿¤ò ioctl(2) ¤ÎÂè 3 °ú¤¿ô¤È¤·¤ÆÅÏ¤µ¤Ê¤±¤ì¤Ð¤Ê¤é¤Ê¤¤¡£

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/dev/rtc, /dev/rtc0, /dev/rtc1 ¤Ê¤É: RTC ÆÃ¼ì¥¥ã¥é¥¯¥¿¡¼¥Ç¥Ð¥¤¥¹¥Õ¥¡¥¤¥ë

/proc/driver/rtc: (1 ¤ÄÌÜ¤Î) RTC ¤Î¾õÂÖ

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¥«¡¼¥Í¥ë¤Î¥·¥¹¥Æ¥à¥¯¥í¥Ã¥¯¤ò adjtimex(2) ¤ò»È¤Ã¤Æ³°Éô»²¾È¤ÇÆ±´ü¤µ¤»¤ë¾ì¹ç¡¢ adjtimex(2) ¤Ï»ØÄê¤µ¤ì¤¿ RTC ¤ò 11 Ê¬Ëè¤ËÄê´üÅª¤Ë¹¹¿·¤¹¤ë¡£ ¤³¤ì¤ò¹Ô¤¦¤¿¤á¥«¡¼¥Í¥ë¤Ï¼þ´üÅª¤Ê³ä¤ê¹þ¤ß¤òÃ»´ü´ÖÌµ¸ú¤Ë¤¹¤ëÉ¬Í×¤¬¤¢¤ë¡£ ¤³¤ì¤Ï RTC ¤ò»È¤¦¥×¥í¥°¥é¥à¤Ë±Æ¶Á¤òÍ¿¤¨¤ë¡£

RTC ¤Îµª¸µ¤Ï¡¢¥·¥¹¥Æ¥à¥¯¥í¥Ã¥¯¤Ç¤Î¤ß»ÈÍÑ¤µ¤ì¤ë POSIX ¤Îµª¸µ¤È¤Ï²¿¤Î´Ø·¸¤â¤Ê¤¤¡£

RTC ¤Îµª¸µ¤ÈÇ¯¤Î¥ì¥¸¥¹¥¿¤Ë´ð¤Å¤¯Ç¯¤¬ 1970 Ì¤Ëþ¤Ç¤¢¤ë¾ì¹ç¡¢ 100 Ç¯¸å¡¢¤Ä¤Þ¤ê 2000 ¤«¤é 2069 ¤Ç¤¢¤ë¤È²¾Äê¤µ¤ì¤ë¡£

°Ê²¼¤Îµ¡Ç½¤ò¥µ¥Ý¡¼¥È¤¹¤ë RTC ¤â¤¢¤ë¡£ 1 ÉÃ¤ÎÊ¬¿ô¤Ç¤Ï¤Ê¤¯¡¢1 ÉÃ¤ÎÇÜ¿ô¤ò¼þ´ü¤È¤¹¤ë¼þ´üÅª¤Ê³ä¤ê¹þ¤ß¡£ Ê£¿ô¤Î¥¢¥é¡¼¥à¡£ ¥×¥í¥°¥é¥à²ÄÇ½¤Ê½ÐÎÏ¥¯¥í¥Ã¥¯¥·¥°¥Ê¥ë¡£ ÉÔ´øÈ¯À (non-volatile) ¥á¥â¥ê¡£ ¤³¤Î API ¤Ç¸½ºßÄó¶¡¤·¤Æ¤¤¤Ê¤¤¡¢¤½¤ÎÂ¾¤Î¥Ï¡¼¥É¥¦¥§¥¢µ¡Ç½¡£

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hwclock(8), date(1), time(2), stime(2), gettimeofday(2), settimeofday(2), adjtimex(2), gmtime(3), time(7), /usr/src/linux/Documentation/rtc.txt

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