Check (byte by byte) if two files are equal, using open(), read() in C

I know how to check if two files have the same content. I made it using fopen and fread. However, I have some problems translating the code and use open and read instead of fopen and fread.

When I run the program like this: ./app file1.txt file2.txt (and files are not equal) program shows the message that they are not equal, and thats perfectly correct. When I try ./app file1 file1 instead, it also shows that the files are NOT equal, which is not true for sure. Another thing is that using Code::Blocks it shows me the return code 255 so I thing I messed something up, but do not what exactly.

#include <unistd.h>
#include <stdio.h>
#include <sys/types.h>
#include <errno.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <stdlib.h>

int CompareFileByteByByte(char *file1, char *file2)
{
    int results = 0, c1, c2, br1, br2;
    int fin1 = -1, fin2 = -1;

    fin1 = open(file1, O_RDONLY);
    fin2 = open(file2, O_RDONLY);

    if (fin1 == -1)
    {
        perror ("open");
        return -1;
    }

    if (fin2 == -1)
    {
        perror ("open");
        return -1;
    }

    br1 = read (fin1, &c1, 1);
    br2 = read (fin2, &c2, 1);

    while((br1 > 0) && (br2 > 0) && results)
    {
        br1 = read (fin1, &c1, 1);
        br2 = read (fin2, &c2, 1);
        results = (c1 == c2);

        printf("%c %c\n", c1, c2);
    }

    close(fin1);
    close(fin2);

    return results;
}


int main(int argc, char **argv)
{
    if(argc < 3)
    {
        printf("Example usage:\n\n\t %s file1 file2\n\n", argv[0]);
        exit(-1);
    }
    else
    {
        printf("%s %s\n", argv[1], argv[2]);

        if(CompareFileByteByByte(argv[1], argv[2]))
        {
            printf("Files are equal\n");
        }
        else
        {
            printf("Files are NOT equal\n");
        }
    }


    return 0;
}