ioctlsocket 関数 (winsock.h) - Win32 apps | Microsoft Learn
https://learn.microsoft.com/ja-jp/windows/win32/api/winsock/nf-winsock …
iResult = ioctlsocket(m_socket, FIONBIO, &iMode); if (iResult != NO_ERROR) printf("ioctlsocket failed with error: %ld\n", iResult); } 互 …