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¡¡¡¡ÔÚ³ÌÐòµ±ÖÐ,ÎÒÃǾ­³£ÒªÊä³öϵͳµ±Ç°µÄʱ¼ä,±ÈÈçÎÒÃÇʹÓÃdateÃüÁîµÄÊä³ö½á¹û.Õâ¸öʱºòÎÒÃÇ¿ÉÒÔʹÓÃÏÂÃæÁ½¸öº¯Êý:
¡¡¡¡#include
¡¡¡¡time_t time(time_t *tloc);
¡¡¡¡char *ctime(const time_t *clock);
¡¡¡¡timeº¯Êý·µ»Ø´Ó1970Äê1ÔÂ1ÈÕ0µãÒÔÀ´µÄÃëÊý.´æ´¢ÔÚtime_t½á¹¹Ö®ÖÐ.²»¹ýÕâ¸öº¯ÊýµÄ·µ»ØÖµ¶ÔÓÚÎÒÃÇÀ´ËµÃ»ÓÐʲôʵ¼ÊÒâÒå.Õâ¸öʱºòÎÒÃÇʹÓõڶþ¸öº¯Êý½«ÃëÊýת»¯Îª×Ö·û´®. Õâ¸öº¯ÊýµÄ·µ»ØÀàÐÍÊǹ̶¨µÄ:Ò»¸ö¿ÉÄÜֵΪ.Thu Dec7 14:58:59 2000 Õâ¸ö×Ö·û´®µÄ³¤¶ÈÊǹ̶¨µÄΪ26.
2.ʱ¼äµÄ²âÁ¿
¡¡¡¡ÓÐʱºòÎÒÃÇÒª¼ÆËã³ÌÐòÖ´ÐеÄʱ¼ä.±ÈÈçÎÒÃÇÒª¶ÔËã·¨½øÐÐʱ¼ä·ÖÎö.Õâ¸öʱºò¿ÉÒÔʹÓÃÏÂÃæÕâ¸öº¯Êý. #include
¡¡¡¡int gettimeofday(struct timeval *tv,struct timezone *tz);
¡¡¡¡strut timeval {
¡¡¡¡long tv_sec; /* ÃëÊý */
¡¡¡¡long tv_usec; /* ΢ÃëÊý */
¡¡¡¡};
¡¡¡¡gettimeofday½«Ê±¼ä±£´æÔڽṹtvÖ®ÖÐ.tzÒ»°ãÎÒÃÇʹÓÃNULLÀ´´úÌæ.
3.¼ÆÊ±Æ÷µÄʹÓÃ
3.1¡¢alarm
-------------------------------------------
    Èç¹û²»ÒªÇóºÜ¾«È·µÄ»°£¬ÓÃalarm()ºÍsignal()¾Í¹»ÁË
    unsigned int alarm(unsigned int seconds)
    º¯Êý˵Ã÷: alarm()ÓÃÀ´ÉèÖÃÐźÅSIGALRMÔÚ¾­¹ý²ÎÊýsecondsÖ¸¶¨µÄÃëÊýºó´«Ë͸øÄ¿Ç°µÄ½ø³Ì¡£Èç¹û²ÎÊýsecondsΪ0£¬Ôò֮ǰÉèÖõÄÄÖÖӻᱻȡÏû£¬²¢½«Ê£ÏµÄʱ¼ä·µ»Ø¡£
    ·µ»ØÖµ: ·µ»ØÖ®Ç°ÄÖÖÓµÄÊ£ÓàÃëÊý£¬Èç¹û֮ǰδÉèÄÖÖÓÔò·µ»Ø0¡£
    alarm()Ö´Ðк󣬽ø³Ì½«¼ÌÐøÖ´ÐУ¬ÔÚºóÆÚ(alarmÒÔºó)µÄÖ´Ðйý³ÌÖн«»áÔÚsecondsÃëºóÊÕµ½ÐźÅSIGALRM²¢Ö´ÐÐÆä´¦Àíº¯Êý¡£
#include <stdio.h>
#include <unistd.h>
#include <signal.h>
void sigalrm_fn(int sig)
{
    printf("alarm!\n");
    alarm(2);
    return;
}
int main(void)
{
    signal(SIGALRM, sigalrm_fn);
    alarm(1);
    while(1) pause();
}
3.2¡¢setitimer()
-------------------------------------------
    int setitimer(int which, const struct itimerval *value, struct itimerval *ovalue));
    setitimer()±Èalarm¹¦ÄÜÇ¿´ó£¬Ö§³Ö3ÖÖÀàÐ͵Ķ¨Ê±Æ÷£º
    ITIMER_REAL :&nb


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