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		ret = read(*((int*)fd),&event,sizeof(struct input_event));

C
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <fcntl.h>
#include <termios.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <signal.h>
#include <linux/input.h>
 
#define EV_PRESSED 1
 
//INIT DEVICE KEYBOARD
int init_keyboard(int *fd)
{
	//file buffer keyboard
	char *keyboard = "/dev/input/event3";
 
	if(getuid() != 0){
		printf("You are not root! This may not work...\n");
		return -1;
	}
 
	if((*fd = open(keyboard,O_RDONLY)) == -1){
		printf("%s is not a valid keyboard. \n",keyboard);
		return -1;
	}
 
	fcntl(*fd,F_SETFL,FNDELAY);
 
	printf("file %s opened\n",keyboard);
 
	return 0;
}
 
//ROUTINE KEY_PRESSED
void* update_keyboard(void *fd)
{
	struct input_event event;
	int ret;
 
	while(1){
		usleep(100000);		
		ret = read(*((int*)fd),&event,sizeof(struct input_event));
		printf("ret = %d\n",ret);
		if(event.type == EV_KEY){
			printf("EV_KEY\n");
			if(event.value == EV_PRESSED){
				if(event.code == KEY_ESC){
					printf("!!!__PRESSED_ESC__!!!");
				}
			}
		}
	}
}
 
int main(void)
{	
	int fd_keyboard,status;
	pthread_t thread_keyboard;
 
	if(!init_keyboard(&fd_keyboard)){
		//create thread read key of keyboard
		printf("create thread keyboard read\n");
		status = pthread_create(&thread_keyboard,NULL,update_keyboard,(void*)(&fd_keyboard));
		if(status != 0){
			printf("error create thread keyboard read\n");
			exit(-1);
		}
 
		if(!pthread_detach(thread_keyboard)){
			printf("detach thread read keyboard\n");
		}
        }
 
        while(1){
         // MAIN LOOP
        }       
 
	return 0;
}