text: /*
   * libev win32 compatibility cruft (_not_ a backend)
   *
   * Copyright (c) 2007,2008,2009 Marc Alexander Lehmann <libev@schmorp.de>
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without modifica-
   * tion, are permitted provided that the following conditions are met:
   *
   *   1.  Redistributions of source code must retain the above copyright notice,
   *       this list of conditions and the following disclaimer.
   *
   *   2.  Redistributions in binary form must reproduce the above copyright
   *       notice, this list of conditions and the following disclaimer in the
   *       documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
   * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
   * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
   * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
   * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
   * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
   * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
   * OF THE POSSIBILITY OF SUCH DAMAGE.
   *
   * Alternatively, the contents of this file may be used under the terms of
   * the GNU General Public License ("GPL") version 2 or any later version,
   * in which case the provisions of the GPL are applicable instead of
   * the above. If you wish to allow the use of your version of this file
   * only under the terms of the GPL and not to allow others to use your
   * version of this file under the BSD license, indicate your decision
   * by deleting the provisions above and replace them with the notice
   * and other provisions required by the GPL. If you do not delete the
   * provisions above, a recipient may use your version of this file under
   * either the BSD or the GPL.
   */
  
  #ifdef _WIN32
  
  /* note: the comment below could not be substantiated, but what would I care */
  /* MSDN says this is required to handle SIGFPE */
  /* my wild guess would be that using something floating-pointy is required */
  /* for the crt to do something about it */
  volatile double SIGFPE_REQ = 0.0f;
  
  static SOCKET
  ev_tcp_socket (void)
  {
  #if EV_USE_WSASOCKET
    return WSASocket (AF_INET, SOCK_STREAM, 0, 0, 0, 0);
  #else
    return socket (AF_INET, SOCK_STREAM, 0);
  #endif
  }
  
  /* oh, the humanity! */
  static int
  ev_pipe (int filedes [2])
  {
    struct sockaddr_in addr = { 0 };
    int addr_size = sizeof (addr);
    struct sockaddr_in adr2;
    int adr2_size = sizeof (adr2);
    SOCKET listener;
    SOCKET sock [2] = { INVALID_SOCKET, INVALID_SOCKET };
  
    if ((listener = ev_tcp_socket ()) == INVALID_SOCKET)
      return -1;
  
    addr.sin_family = AF_INET;
    addr.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
    addr.sin_port = 0;
  
    if (bind (listener, (struct sockaddr *)&addr, addr_size))
      goto fail;
  
    if (getsockname (listener, (struct sockaddr *)&addr, &addr_size))
      goto fail;
  
    if (listen (listener, 1))
      goto fail;
  
    if ((sock [0] = ev_tcp_socket ()) == INVALID_SOCKET)
      goto fail;
  
    if (connect (sock [0], (struct sockaddr *)&addr, addr_size))
      goto fail;
  
    /* TODO: returns INVALID_SOCKET on winsock accept, not < 0. fix it */
    /* when convenient, probably by just removing error checking altogether? */
    if ((sock [1] = accept (listener, 0, 0)) < 0)
      goto fail;
  
    /* windows vista returns fantasy port numbers for sockets:
     * example for two interconnected tcp sockets:
     *
     * (Socket::unpack_sockaddr_in getsockname $sock0)[0] == 53364
     * (Socket::unpack_sockaddr_in getpeername $sock0)[0] == 53363
     * (Socket::unpack_sockaddr_in getsockname $sock1)[0] == 53363
     * (Socket::unpack_sockaddr_in getpeername $sock1)[0] == 53365
     *
     * wow! tridirectional sockets!
     *
     * this way of checking ports seems to work:
     */
    if (getpeername (sock [0], (struct sockaddr *)&addr, &addr_size))
      goto fail;
  
    if (getsockname (sock [1], (struct sockaddr *)&adr2, &adr2_size))
      goto fail;
  
    errno = WSAEINVAL;
    if (addr_size != adr2_size
        || addr.sin_addr.s_addr != adr2.sin_addr.s_addr /* just to be sure, I mean, it's windows */
        || addr.sin_port        != adr2.sin_port)
      goto fail;
  
    closesocket (listener);
  
  #if EV_SELECT_IS_WINSOCKET
    filedes [0] = EV_WIN32_HANDLE_TO_FD (sock [0]);
    filedes [1] = EV_WIN32_HANDLE_TO_FD (sock [1]);
  #else
    /* when select isn't winsocket, we also expect socket, connect, accept etc.
     * to work on fds */
    filedes [0] = sock [0];
    filedes [1] = sock [1];
  #endif
  
    return 0;
  
  fail:
    closesocket (listener);
  
    if (sock [0] != INVALID_SOCKET) closesocket (sock [0]);
    if (sock [1] != INVALID_SOCKET) closesocket (sock [1]);
  
    return -1;
  }
  
  #undef pipe
  #define pipe(filedes) ev_pipe (filedes)
  
  #define EV_HAVE_EV_TIME 1
  ev_tstamp
  ev_time (void) EV_NOEXCEPT
  {
    FILETIME ft;
    ULARGE_INTEGER ui;
  
    GetSystemTimeAsFileTime (&ft);
    ui.u.LowPart  = ft.dwLowDateTime;
    ui.u.HighPart = ft.dwHighDateTime;
  
    /* also, msvc cannot convert ulonglong to double... yes, it is that sucky */
    return EV_TS_FROM_USEC (((LONGLONG)(ui.QuadPart - 116444736000000000) * 1e-1));
  }
  
  #endif
  
  