int setsockopt()

in demo_example/asio/asio/detail/impl/socket_ops.ipp [1858:1933]

• 65 lines of code
• 21 McCabe index (conditional complexity)

int setsockopt(socket_type s, state_type& state, int level, int optname,
    const void* optval, std::size_t optlen, asio::error_code& ec)
{
  if (s == invalid_socket)
  {
    ec = asio::error::bad_descriptor;
    return socket_error_retval;
  }

  if (level == custom_socket_option_level && optname == always_fail_option)
  {
    ec = asio::error::invalid_argument;
    return socket_error_retval;
  }

  if (level == custom_socket_option_level
      && optname == enable_connection_aborted_option)
  {
    if (optlen != sizeof(int))
    {
      ec = asio::error::invalid_argument;
      return socket_error_retval;
    }

    if (*static_cast<const int*>(optval))
      state |= enable_connection_aborted;
    else
      state &= ~enable_connection_aborted;
    ec.assign(0, ec.category());
    return 0;
  }

  if (level == SOL_SOCKET && optname == SO_LINGER)
    state |= user_set_linger;

#if defined(__BORLANDC__)
  // Mysteriously, using the getsockopt and setsockopt functions directly with
  // Borland C++ results in incorrect values being set and read. The bug can be
  // worked around by using function addresses resolved with GetProcAddress.
  if (HMODULE winsock_module = ::GetModuleHandleA("ws2_32"))
  {
    typedef int (WSAAPI *sso_t)(SOCKET, int, int, const char*, int);
    if (sso_t sso = (sso_t)::GetProcAddress(winsock_module, "setsockopt"))
    {
      int result = sso(s, level, optname,
            reinterpret_cast<const char*>(optval),
            static_cast<int>(optlen));
      get_last_error(ec, result != 0);
      return result;
    }
  }
  ec = asio::error::fault;
  return socket_error_retval;
#else // defined(__BORLANDC__)
  int result = call_setsockopt(&msghdr::msg_namelen,
        s, level, optname, optval, optlen);
  get_last_error(ec, result != 0);
  if (result == 0)
  {
#if defined(__MACH__) && defined(__APPLE__) \
  || defined(__NetBSD__) || defined(__FreeBSD__) \
  || defined(__OpenBSD__) || defined(__QNX__)
    // To implement portable behaviour for SO_REUSEADDR with UDP sockets we
    // need to also set SO_REUSEPORT on BSD-based platforms.
    if ((state & datagram_oriented)
        && level == SOL_SOCKET && optname == SO_REUSEADDR)
    {
      call_setsockopt(&msghdr::msg_namelen, s,
          SOL_SOCKET, SO_REUSEPORT, optval, optlen);
    }
#endif
  }

  return result;
#endif // defined(__BORLANDC__)
}