Using the Input Subsystem, Part II

To Solusrex: I have the same issue. I see at
that the kernel should call /sbin/hotplug which calls device-specific scripts to handle the add or remove event. I'm going to try to instrument the associated script to somehow send a message to my app to notify it. You might try the same.
E Franz

What is the best way to detect from an app that a USB input device was plugged/unplugged beside polling it using open() function?

Hi All,

In one of my project, I need to retrieve events from keyboard in Linux environment. For doing that in my code firstly I opened /dev/input/event0 file and it was successfully opened. However, when I was trying to read something from that file. The read() function stuck and my program can't execute any further steps. Does anybody know why this kind of problem that I encounter and how can I solve this problem. Here is my code:

P.S: In order to execute program you need to be super user and then need to execute code. Otherwise, program will can give "File can not open" error.

#define FILE_PATH "/dev/input/event0"

int main()
{
	printf("Starting KeyEvent Module\n");

	//int file, version;
	size_t file;
	const char *str = FILE_PATH;

	printf("File Path: %s\n", str);

	if((file = open(str, O_RDWR)) < 0)
	{
		printf("ERROR:File can not open\n");
		exit(0);
	}

	struct input_event event[64];

        size_t reader;
        reader = read(file, &event, sizeof(struct input_event) * 64);

        printf("DO NOT COME HERE...\n");

	close(file);
	return 0;
}