while(pos != -1 && lineCount < 10)
    {
        if((rState = read(fileDesc, &c, 1)) < 0)
        {
            perror("read:");
        }
        else if(rState == 0) break;
        else
        {
            if(pos == -1)
            {
                pos = lseek(fileDesc, 0, SEEK_END);
            }
            pos--;
            pos=lseek(fileDesc, pos, SEEK_SET);
            if (c == '\n')
            {
                lineCount++;
            }
            charCount++;
        }
    }