Redirect the standard out to a file and restore it later

redirect_stdout

int f = open(CONSOLE_LOG_CONSOLE, O_CREAT | O_RDWR, 0666);
    int out = dup(1);
    close(1);
    dup2(f, 1);

    // Do something

    fsync(f);
    close(f);
    dup2(out, 1);