getopt 用法

• a:: 说明不能带参数， b: 说明 -b 后面必须带参数：

	while((opt = getopt(argc, argv, "p::s::f:a::b::c::d::e::g::h::i")) != -1) {
		switch (opt) {
			case 'p':
				clsoe_watchdog();
				args_correctly = 1;
				break;
			case 's':
				open_watchdog();
				args_correctly = 1;
				break;
			case 'f':
				time = strtol(optarg, NULL, 0);
				feed_watchdog(time);
				args_correctly = 1;
				break;
			case 'a':
				set_led_status_1(1);
				args_correctly = 1;
				break;
			case 'b':
				set_led_status_1(0);
				args_correctly = 1;
				break;
			case 'c':
				set_led_status_2(1);
				args_correctly = 1;
				break;
			case 'd':
				set_led_status_2(0);
				args_correctly = 1;
				break;
			case 'e':
				set_led_status_3(1);
				args_correctly = 1;
				break;
			case 'g':
				set_led_status_3(0);
				args_correctly = 1;
				break;
			case 'h':
				on_all_led();
				args_correctly = 1;
				break;
			case 'i':
				off_all_led();
				args_correctly = 1;
				break;
			default:
				args_correctly = 0;

		}
	}