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1.ʱ¼ä±íʾ
¡¡¡¡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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ÔÚLinux²Ù×÷ϵͳÖУ¬ÓÐÒ»ÏîÌØÊâµÄ¹¦ÄÜ——³õʼ»¯ÄÚ´æÅÌINITRD(INITial Ram Disk)¼¼Êõ£¬¶øÇÒÄÚºËÖ§³ÖѹËõµÄÎļþϵͳӳÏñ¡£ÓÐÁËÕâÁ½ÏÄÜ£¬ÎÒÃÇ¿ÉÒÔÈÃLinuxϵͳ´ÓСµÄ³õʼ»¯ÄÚ´æÅÌÆô¶¯£¬²¢°ÑϵͳÄÚ´æµÄÒ»²¿·Ö×÷Ϊ¸ùÎļþϵͳ¹ÒÔØ¡£
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ÔÚLinuxÖÐʹÓÃJava Console

The
Java Console provides information about the Java Runtime Environment
(JRE) version, user home directory, and any error message that occurs
while running an applet or application. You can enable the Java Console
for the Linux platform.









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