/*

 * 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] = { -1, -1 };

  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)

{

  FILETIME ft;

  ULARGE_INTEGER ui;

  GetSystemTimeAsFileTime (&ft;;

  ui.u.LowPart  = ft.dwLowDateTime;

  ui.u.HighPart = ft.dwHighDateTime;

  /* msvc cannot convert ulonglong to double... yes, it is that sucky */

  return (LONGLONG)(ui.QuadPart - 116444736000000000) * 1e-7;

}

#endif