檸檬傻斌-無料

使用 daemon1 & daemons2 測試! daemon1 fork 出child process 而使用execv執行hello列印出簡單message.執行一段時間後daemon1被linux kernel kill!

trace:

src/linux/kernel/exit.c --> do_exit(long code) 加入debug message

printk(KERN_INFO "parent dead pid=%d status=%d\n",tsk->pid,code);

do_exit時code=4 --> SIGILL 非法指令

src/linux/arch/mips/icplus/setup.c --> ip218_detect_mem_size()

int main(int argc, char **argv)
{
    pid_t pid,pid01;
    pthread_t thread_id;
    unsigned int loop_cnt=0;
    char *args[] = { "/usr/bin/hello", NULL };
    int fd[2];
    int parent_fd;
    int child_fd;
    int status;
    int pr;
    int disp_cnt;

    usleep(10000000);

    pid01=getpid();
    thread_id=pthread_self();

    signal(SIGKILL,test_kill_01);
//  signal(SIGCLD, test_kill_02);
    signal(SIGHUP, test_kill_03);
    signal(SIGSYS, test_kill_04);
    signal(SIGTERM,test_kill_05);
    signal(SIGSEGV,test_kill_06);

    disp_cnt=0;

    while(1)
    {

       if(disp_cnt==0)
          printf("--------------------------------\n");
       loop_cnt++;
       if(disp_cnt==0)
          printf("loop = %d\n",loop_cnt);
       pid = fork();
       if(pid  <  0)
       {
           printf("fork fial ------------!!!\n");
              exit(-1);
       }
       else if (pid==0){
           if(disp_cnt==0)
              printf("child S =%d %d\n",loop_cnt,getppid());
           execve("/usr/bin/hello", args, NULL);
           //execl("/bin/sh", "sh", "-c","cat /proc/uptime", (char *)0);
           // execl("/bin/sh", "sh", "-c","/usr/bin/hello",  (char *)0);
           //execve("cat /proc/uptime", args, NULL);
           printf("child E =%d\n",loop_cnt);
           loop_cnt++;
           exit(0);
       }

       else{
           pr=waitpid(pid, &status, 0 );
           //usleep(500000);
           //loop_cnt++;
           if(disp_cnt==0)
              printf("parent =%d %d %d %d\n",loop_cnt,pid,getpid(),status);

       }
      if(disp_cnt==0)
        printf("--------------------------------\n\n");

     // disp_cnt++;
      if(disp_cnt>10)
        disp_cnt=0;

    }
#if 0
out_main:
#endif
        return 0;
}

test daemon2

int main(int argc, char **argv)
{
  pid_t pid;
  int sleep_cnt=0;
  int disp_cnt=0;
  int delay_cnt=0;
  int delay_cnt1=0;
    pid =getpid();

    usleep(1000000);

    printf("\n daemon2 %d, argc=[%d], sleep_cnt=[%d]", pid,argc, sleep_cnt);
    fflush(stdout);

    while(1)
    {
        sleep_cnt++;
        if(sleep_cnt>900000){
          sleep_cnt=0;
          disp_cnt++;
          if(disp_cnt>900000){
             disp_cnt=0;
             delay_cnt++;
             if(delay_cnt>900000){
                delay_cnt=0;
                delay_cnt1++;
                if(delay_cnt1>4){
                    delay_cnt1=0;
                    printf("\ndaemon2 %d is alive K----------------------->>\n",pid);
                }
             }
          }
        }

    }

//out_main:

    return 0;
}