"Fossies" - the Fresh Open Source Software Archive

Member "libev-4.33/ev_win32.c" (19 Nov 2019, 5346 Bytes) of package /linux/misc/libev-4.33.tar.gz:


As a special service "Fossies" has tried to format the requested source page into HTML format using (guessed) C and C++ source code syntax highlighting (style: standard) with prefixed line numbers and code folding option. Alternatively you can here view or download the uninterpreted source code file. For more information about "ev_win32.c" see the Fossies "Dox" file reference documentation and the last Fossies "Diffs" side-by-side code changes report: 4.27_vs_4.31.

    1 /*
    2  * libev win32 compatibility cruft (_not_ a backend)
    3  *
    4  * Copyright (c) 2007,2008,2009 Marc Alexander Lehmann <libev@schmorp.de>
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without modifica-
    8  * tion, are permitted provided that the following conditions are met:
    9  *
   10  *   1.  Redistributions of source code must retain the above copyright notice,
   11  *       this list of conditions and the following disclaimer.
   12  *
   13  *   2.  Redistributions in binary form must reproduce the above copyright
   14  *       notice, this list of conditions and the following disclaimer in the
   15  *       documentation and/or other materials provided with the distribution.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
   18  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
   19  * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
   20  * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
   21  * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   22  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
   23  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
   24  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
   25  * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
   26  * OF THE POSSIBILITY OF SUCH DAMAGE.
   27  *
   28  * Alternatively, the contents of this file may be used under the terms of
   29  * the GNU General Public License ("GPL") version 2 or any later version,
   30  * in which case the provisions of the GPL are applicable instead of
   31  * the above. If you wish to allow the use of your version of this file
   32  * only under the terms of the GPL and not to allow others to use your
   33  * version of this file under the BSD license, indicate your decision
   34  * by deleting the provisions above and replace them with the notice
   35  * and other provisions required by the GPL. If you do not delete the
   36  * provisions above, a recipient may use your version of this file under
   37  * either the BSD or the GPL.
   38  */
   39 
   40 #ifdef _WIN32
   41 
   42 /* note: the comment below could not be substantiated, but what would I care */
   43 /* MSDN says this is required to handle SIGFPE */
   44 /* my wild guess would be that using something floating-pointy is required */
   45 /* for the crt to do something about it */
   46 volatile double SIGFPE_REQ = 0.0f;
   47 
   48 static SOCKET
   49 ev_tcp_socket (void)
   50 {
   51 #if EV_USE_WSASOCKET
   52   return WSASocket (AF_INET, SOCK_STREAM, 0, 0, 0, 0);
   53 #else
   54   return socket (AF_INET, SOCK_STREAM, 0);
   55 #endif
   56 }
   57 
   58 /* oh, the humanity! */
   59 static int
   60 ev_pipe (int filedes [2])
   61 {
   62   struct sockaddr_in addr = { 0 };
   63   int addr_size = sizeof (addr);
   64   struct sockaddr_in adr2;
   65   int adr2_size = sizeof (adr2);
   66   SOCKET listener;
   67   SOCKET sock [2] = { -1, -1 };
   68 
   69   if ((listener = ev_tcp_socket ()) == INVALID_SOCKET)
   70     return -1;
   71 
   72   addr.sin_family = AF_INET;
   73   addr.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
   74   addr.sin_port = 0;
   75 
   76   if (bind (listener, (struct sockaddr *)&addr, addr_size))
   77     goto fail;
   78 
   79   if (getsockname (listener, (struct sockaddr *)&addr, &addr_size))
   80     goto fail;
   81 
   82   if (listen (listener, 1))
   83     goto fail;
   84 
   85   if ((sock [0] = ev_tcp_socket ()) == INVALID_SOCKET)
   86     goto fail;
   87 
   88   if (connect (sock [0], (struct sockaddr *)&addr, addr_size))
   89     goto fail;
   90 
   91   /* TODO: returns INVALID_SOCKET on winsock accept, not < 0. fix it */
   92   /* when convenient, probably by just removing error checking altogether? */
   93   if ((sock [1] = accept (listener, 0, 0)) < 0)
   94     goto fail;
   95 
   96   /* windows vista returns fantasy port numbers for sockets:
   97    * example for two interconnected tcp sockets:
   98    *
   99    * (Socket::unpack_sockaddr_in getsockname $sock0)[0] == 53364
  100    * (Socket::unpack_sockaddr_in getpeername $sock0)[0] == 53363
  101    * (Socket::unpack_sockaddr_in getsockname $sock1)[0] == 53363
  102    * (Socket::unpack_sockaddr_in getpeername $sock1)[0] == 53365
  103    *
  104    * wow! tridirectional sockets!
  105    *
  106    * this way of checking ports seems to work:
  107    */
  108   if (getpeername (sock [0], (struct sockaddr *)&addr, &addr_size))
  109     goto fail;
  110 
  111   if (getsockname (sock [1], (struct sockaddr *)&adr2, &adr2_size))
  112     goto fail;
  113 
  114   errno = WSAEINVAL;
  115   if (addr_size != adr2_size
  116       || addr.sin_addr.s_addr != adr2.sin_addr.s_addr /* just to be sure, I mean, it's windows */
  117       || addr.sin_port        != adr2.sin_port)
  118     goto fail;
  119 
  120   closesocket (listener);
  121 
  122 #if EV_SELECT_IS_WINSOCKET
  123   filedes [0] = EV_WIN32_HANDLE_TO_FD (sock [0]);
  124   filedes [1] = EV_WIN32_HANDLE_TO_FD (sock [1]);
  125 #else
  126   /* when select isn't winsocket, we also expect socket, connect, accept etc.
  127    * to work on fds */
  128   filedes [0] = sock [0];
  129   filedes [1] = sock [1];
  130 #endif
  131 
  132   return 0;
  133 
  134 fail:
  135   closesocket (listener);
  136 
  137   if (sock [0] != INVALID_SOCKET) closesocket (sock [0]);
  138   if (sock [1] != INVALID_SOCKET) closesocket (sock [1]);
  139 
  140   return -1;
  141 }
  142 
  143 #undef pipe
  144 #define pipe(filedes) ev_pipe (filedes)
  145 
  146 #define EV_HAVE_EV_TIME 1
  147 ev_tstamp
  148 ev_time (void)
  149 {
  150   FILETIME ft;
  151   ULARGE_INTEGER ui;
  152 
  153   GetSystemTimeAsFileTime (&ft);
  154   ui.u.LowPart  = ft.dwLowDateTime;
  155   ui.u.HighPart = ft.dwHighDateTime;
  156 
  157   /* also, msvc cannot convert ulonglong to double... yes, it is that sucky */
  158   return EV_TS_FROM_USEC (((LONGLONG)(ui.QuadPart - 116444736000000000) * 1e-1));
  159 }
  160 
  161 #endif
  162