Function eagain

classpath/java-nio.cpp:183–191

}

inline bool eagain()
{
#ifdef PLATFORM_WINDOWS
  return WSAGetLastError() == WSAEINPROGRESS
         or WSAGetLastError() == WSAEWOULDBLOCK;
#else
  return errno == EAGAIN;
#endif
}

bool setBlocking(JNIEnv* e, int d, bool blocking)
{