linux c 定时器

struct itimerval t;fflush(stdout);setvbuf(stdout,NULL,_IONBF,0);t.it_interval.tv_usec =20000;t.it_interval.tv_sec = 0;t.it_value.tv_usec =20000;t.it_value.tv_sec = 0;if( setitimer( ITIMER_REAL, &t, 0) < 0 ){printf("set");return -1;}signal( SIGALRM, my_alarm_handler );

void my_alarm_handler()

{}