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void init_sigaction(void)
{
    struct sigaction tact;
    tact.sa_handler = drawFrame_proc;
    tact.sa_flags = 0;
    sigemptyset(&tact.sa_mask);
    sigaction(SIGALRM, &tact, NULL);
}

void init_time()
{
    struct itimerval value;
    value.it_value.tv_sec = 0;
    value.it_value.tv_usec = 40000;
    value.it_interval = value.it_value;
    setitimer(ITIMER_REAL, &value, NULL);
}

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