多进程环境

#include
#include
#include
#include
#include
#include
#include
#include
#include

void pr()
{
  printf("just test this is exit\n");
}

int main(int argc, char **argv[])
{
  int pid;
  int count=0;

  pid = fork();
  if(pid < 0) printf("error fork\n");
  else if(pid == 0){
    while(1)
    {
      printf("now  count = %d\n", count++);
      sleep(1);
    }

  }
  else { 
     time_t now_t;
     time_t now_s;
     struct tm now_tm;
     now_s = now_t = time(NULL);
     printf("now parent is waiting\n");
     while ((now_t - now_s)< 10)
     {
       now_t = time(NULL);
     }
     kill(pid, SIGKILL);
    atexit(pr);
     printf("now end\n");
     exit(0);
  }
}