linux stand out 을 file 에 logging 하기

static const char *TEMPORARY_LOG_FILE = "/tmp/recovery.log";

redirect_stdio(TEMPORARY_LOG_FILE);

static void redirect_stdio(const char* filename) {

    // If these fail, there's not really anywhere to complain...

    freopen(filename, "a", stdout); setbuf(stdout, NULL);

    freopen(filename, "a", stderr); setbuf(stderr, NULL);

}