#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <linux/input.h>

// read events in a loop
int main(int argc, char** argv)
{
    // check if we got a device parameter
    if( argc < 2 )
    {
        printf ("please provide a device to listen on!\n" );
        return 1;
    }

    // open the device for reading
    int fd = open( argv[1], O_RDONLY );
    if( fd < 0 )
    {
        printf( "Error opening device \'%s\'\n", argv[1] );
        return 2;
    }

    // read events
    struct input_event ev;
    while( read( fd, &ev, sizeof( struct input_event ) ) )
    {
        printf( "Input event @ %d.%d code=%u type=%u value=%d\n",
                    (int) ev.time.tv_sec,
                    (int) ev.time.tv_usec,
                    (unsigned) ev.code,
                    (unsigned) ev.type,
                    (int) ev.value
              );
    }

    return 0;
}