04clock_01misc_app

#include <stdio.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>

#define DEV_NAME "/dev/my_led"

int main(int argc, char const *argv[])
{
    
    int  fd = open(DEV_NAME, O_RDWR);
    if(fd < 0) {
        perror("open");
        return -1;
    }

    char buf[10] = {0};

    int ret = read(fd, buf, 10);
    printf("buf = %s
", buf); 

    close(fd);
    return 0;
}