Linux的 Signal 事件用法

时间：2011-05-18 来源：邓维

View Code    //start
   #include <signal.h>
   #include <sys/time.h>
   #include <stdio.h>
   #include <stdlib.h>
   static void sighandler(int sigty);
   bool goon=true;
   int tot,last;
   int main(){
   struct itimerval v;
   if (signal(SIGUSR1,sighandler)==SIG_ERR){
   printf("error on reg");
   exit(1);
   }
   if (signal(SIGALRM,sighandler)==SIG_ERR){
   printf("error on reg");
   exit(2);
   }
   v.it_value.tv_sec=3; //定时3秒
   v.it_value.tv_usec=0;
   v.it_interval.tv_sec=0;//只做一次
   v.it_interval.tv_usec=0;
   setitimer(ITIMER_REAL,&v,NULL); //定时器
   printf("timer has be seted\n");
   tot=0;
   last=v.it_value.tv_sec;
   goon=true;
   while (goon){
   getitimer(ITIMER_REAL,&v);
   int now = v.it_value.tv_sec;
   //printf("now: %d\n",now);
   if (now==last-1){
   raise(SIGUSR1);
   tot++;
   }
   last=now;
   }

   return 0;
   }
   static void sighandler(int sigty){
   if (sigty==SIGUSR1){
   struct itimerval v;
   getitimer(ITIMER_REAL,&v);
   printf("real time: %ld sec %ld\n",v.it_value.tv_sec ,v.it_value.tv_usec  );
   }else if (sigty==SIGALRM){
   printf("timer stop\n");
   goon=false;
   }
   }
   //end

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