// while ((c = recv(din, buf, bufsize, 1)) > 0) {
// if ((d = write(fileno(fout), buf, c)) != c)
// if ((d = write(fileno(fout), buf, c)) != c)
// while ((c = recv(din, buf, bufsize, 1)) > 0) {
// if ((d = write(fileno(fout), buf, c)) != c)
// if ((d = write(fileno(fout), buf, c)) != c)