GETITIMER

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#include <sys/time.h>

int getitimer(int which, struct itimerval *value);

int setitimer(int which, const struct itimerval *value, struct itimerval *ovalue);

ÀâÌÀ

ITIMER_REAL

¤Ï¼Â»þ´Ö(real time)¤Ç¸º¾¯¤·¡¢Àڤ줿¾ì¹ç¤Ë¤Ï SIGALRM ¤¬Á÷¤é¤ì¤ë¡£

ITIMER_VIRTUAL

¤Ï¥×¥í¥»¥¹¤¬¼Â¹Ô¤µ¤ì¤Æ¤¤¤ë´Ö¤Î¤ß¸º¾¯¤·¡¢Àڤ줿¾ì¹ç¤Ï SIGVTALRM ¤¬Á÷¤é¤µ¤ì¤ë¡£

ITIMER_PROF

¤Ï¥×¥í¥»¥¹¤¬¼Â¹Ô¤µ¤ì¤Æ¤¤¤ë´Ö¤È ¤½¤Î¥×¥í¥»¥¹¤Î¤¿¤á¤Ë¥·¥¹¥Æ¥à¤¬¼Â¹Ô¤µ¤ì¤Æ¤¤¤ë´Ö¤Ë¸º¾¯¤¹¤ë¡£ ¤³¤Î¥¿¥¤¥Þ¡¼¤Ï¤¿¤¤¤Æ¤¤ ITIMER_VIRTUAL ¤ÈÁȤ߹ç¤ï¤µ¤ì¡¢¥¢¥×¥ê¥±¡¼¥·¥ç¥ó¤¬¥«¡¼¥Í¥ë¶õ´Ö¤È¥æ¡¼¥¶¡¼¶è´Ö¤Ç ¤É¤ì¤À¤±¤Î»þ´Ö¤ò²á¤´¤·¤¿¤«¥×¥í¥Õ¥¡¥¤¥ë¤¹¤ë¤Î¤Ë»ÈÍѤµ¤ì¤ë¡£ Àڤ줿¾ì¹ç¤Ë¤Ï SIGPROF ¤¬Á÷¤é¤ì¤ë¡£

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struct itimerval {
    struct timeval it_interval; /* next value */
    struct timeval it_value;    /* current value */
};
struct timeval {
    long tv_sec;                /* seconds */
    long tv_usec;               /* microseconds */
};

getitimer(2) ¤Ï value ¤Ç»ØÄꤵ¤ì¤¿¹½Â¤ÂÎ¤Ë which ¤Ç»ØÄꤵ¤ì¤¿ ( ITIMER_REAL, ITIMER_VIRTUAL, ITIMER_PROF ¤Î¤É¤ì¤«¤Î) ¥¿¥¤¥Þ¡¼¤Î¸½ºß¤ÎÀßÄê¤ò³ÊǼ¤¹¤ë¡£ it_value Í×ÁǤˤϥ¿¥¤¥Þ¡¼¤Î»Ä¤ê»þ´Ö¤¬ÀßÄꤵ¤ì¤ë¡£¥¿¥¤¥Þ¡¼¤¬¥ª¥Õ¤Î¾ì¹ç¤Ï ¥¼¥í¤¬ÀßÄꤵ¤ì¤ë¡£Æ±ÍÍ¤Ë it_interval ¤Ë¤Ï½é´üÃͤ¬ÀßÄꤵ¤ì¤ë¡£ setitimer(2) ¤Ï»ØÄꤵ¤ì¤¿¥¿¥¤¥Þ¡¼¤Ë value ¤ÎÃͤòÀßÄꤹ¤ë¡£ ovalue ¤¬¥¼¥í¤Ç¤Ê¤±¤ì¤Ð¡¢¥¿¥¤¥Þ¡¼¤Î¸Å¤¤Ãͤ¬¤½¤³¤Ë³ÊǼ¤µ¤ì¤ë¡£

¥¿¥¤¥Þ¡¼¤Ï it_value ¤«¤é¥¼¥í¤Ø¸þ¤±¤Æ¸º¤Ã¤Æ¤¤¤­¡¢¥·¥°¥Ê¥ë¤òÀ¸À®¤·¡¢ it_interval ¤Ë½é´ü²½¤µ¤ì¤ë¡£ ¥¿¥¤¥Þ¡¼¤¬¥¼¥í¤ËÀßÄꤵ¤ì¤¿( it_value ¤¬¥¼¥í¤«¡¢¥¿¥¤¥Þ¡¼¤¬Àڤ줿»þ¤Ë it_interval ¤¬¥¼¥í¤Î)¾ì¹ç¤ÏÄä»ß¤¹¤ë¡£

tv_sec ¤È tv_usec ¤ÎξÊý¤¬¥¿¥¤¥Þ¡¼´Ö³Ö¤ò·èÄꤹ¤ë¤Î¤Ë°ÕÌ£¤ò»ý¤Ä¡£

Í׵ᤷ¤¿»þ´Ö¤¬¤¯¤ë¤Þ¤¨¤Ë¥¿¥¤¥Þ¡¼¤¬ÀÚ¤ì¤ë¤³¤È¤Ï¤Ê¤¯¡¢ µÕ¤Ë¤¢¤ë°ìÄê¤Îû¤¤»þ´Ö¤À¤±ÃÙ¤ì¤ë¡£ ¤³¤ÎÃͤϥ·¥¹¥Æ¥à¤Î»þ´Öʬ²òǽ (¸½ºß¤Ï 10ms) ¤Ë°Í¸¤¹¤ë¡£ Àڤ줿¾ì¹ç¤Ë¤Ï¥·¥°¥Ê¥ë¤¬À¸À®¤µ¤ì¡¢¥¿¥¤¥Þ¡¼¤¬½é´ü²½¤µ¤ì¤ë¡£¥×¥í¥»¥¹¤¬ ¥¢¥¯¥Æ¥£¥Ö(active)¤Ê»þ( ITIMER_VIRT ¾ì¹ç¤Ë¤Ï¾ï¤Ë¿¿)¤Ë¥¿¥¤¥Þ¡¼¤¬Àڤ줿¾ì¹ç¡¢À¸À®¤µ¤ì¤¿¥·¥°¥Ê¥ë¤Ï¤¹¤°¤Ë Á÷¤é¤ì¤ë¡£¤½¤¦¤Ç¤Ê¤ì¤Ð¥·¥¹¥Æ¥à¤ÎÉé²Ù¤Ë¤è¤ê¾¯¤·¤Î»þ´Ö¤À¤±ÃÙ¤ì¤Æ Á÷¤é¤ì¤ë¡£

ÊÖ¤êÃÍ

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EFAULT

value ¤Þ¤¿¤Ï ovalue ¤¬Í­¸ú¤Ê¥Ý¥¤¥ó¥¿¡¼¤Ç¤Ê¤¤¡£

EINVAL

which ¤¬ ITIMER_REAL, ITIMER_VIRT, ITIMER_PROF ¤Î¤É¤ì¤«¤Ç¤Ê¤¤¡£

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