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alarm
       Èç¹û²»ÒªÇóºÜ¾«È·µÄ»°£¬Óà alarm() ºÍ signal() ¾Í¹»ÁË 
       unsigned int alarm(unsigned int seconds)      
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       #include <stdio.h>
       #include <unistd.h>
       #include <signal.h>
       void sigalrm_fn(int sig)
       {
               /* Do something */
               printf("alarm!\n");
               alarm(2);
               return;
       }
       int main(void)
       {
               signal(SIGALRM, sigalrm_fn);
               alarm(2);
               /* Do someting */
               while(1) pause();
       }
  2.  setitimer
       int setitimer(int which, const struct itimerval *value, struct itimerval *ovalue)); 
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       ITIMER_REAL :  ÒÔÏµÍ³ÕæÊµµÄʱ¼äÀ´¼ÆË㣬ËüËͳöSIGALRMÐźš£  
       ITIMER_VIRTUAL :  ÒÔ¸ÃÐгÌÕæÕýÓÐÖ´ÐеÄʱ¼äÀ´¼ÆËã£


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