granicus.if.org Git - postgresql/blob - src/backend/port/win32/mingwcompat.c

   1 /*-------------------------------------------------------------------------
   2  *
   3  * mingwcompat.c
   4  *        MinGW compatibility functions
   5  *
   6  * Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
   7  *
   8  * IDENTIFICATION
   9  *        $PostgreSQL: pgsql/src/backend/port/win32/mingwcompat.c,v 1.9 2010/02/09 19:55:14 mha Exp $
  10  *
  11  *-------------------------------------------------------------------------
  12  */
  13
  14 #include "postgres.h"
  15
  16 #ifndef WIN32_ONLY_COMPILER
  17 /*
  18  * MingW defines an extern to this struct, but the actual struct isn't present
  19  * in any library. It's trivial enough that we can safely defined it
  20  * ourselves.
  21  */
  22 const struct in6_addr in6addr_any = {{{0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0}}};
  23
  24
  25 /*
  26  * This file contains loaders for functions that are missing in the MinGW
  27  * import libraries. It's only for actual Win32 API functions, so they are
  28  * all present in proper Win32 compilers.
  29  */
  30 static HMODULE kernel32 = NULL;
  31
  32 /*
  33  * Load DLL file just once regardless of how many functions
  34  * we load/call in it.
  35  */
  36 static void
  37 LoadKernel32()
  38 {
  39         if (kernel32 != NULL)
  40                 return;
  41
  42         kernel32 = LoadLibraryEx("kernel32.dll", NULL, 0);
  43         if (kernel32 == NULL)
  44                 ereport(FATAL,
  45                                 (errmsg_internal("could not load kernel32.dll: %d",
  46                                                                  (int) GetLastError())));
  47 }
  48
  49
  50 /*
  51  * Replacement for RegisterWaitForSingleObject(), which lives in
  52  * kernel32.dll
  53  */
  54 typedef
  55 BOOL            (WINAPI * __RegisterWaitForSingleObject)
  56                         (PHANDLE, HANDLE, WAITORTIMERCALLBACK, PVOID, ULONG, ULONG);
  57 static __RegisterWaitForSingleObject _RegisterWaitForSingleObject = NULL;
  58
  59 BOOL            WINAPI
  60 RegisterWaitForSingleObject(PHANDLE phNewWaitObject,
  61                                                         HANDLE hObject,
  62                                                         WAITORTIMERCALLBACK Callback,
  63                                                         PVOID Context,
  64                                                         ULONG dwMilliseconds,
  65                                                         ULONG dwFlags)
  66 {
  67         if (_RegisterWaitForSingleObject == NULL)
  68         {
  69                 LoadKernel32();
  70
  71                 _RegisterWaitForSingleObject = (__RegisterWaitForSingleObject)
  72                         GetProcAddress(kernel32, "RegisterWaitForSingleObject");
  73
  74                 if (_RegisterWaitForSingleObject == NULL)
  75                         ereport(FATAL,
  76                                         (errmsg_internal("could not locate RegisterWaitForSingleObject in kernel32.dll: %d",
  77                                                                          (int) GetLastError())));
  78         }
  79
  80         return (_RegisterWaitForSingleObject)
  81                 (phNewWaitObject, hObject, Callback, Context, dwMilliseconds, dwFlags);
  82 }
  83
  84 #endif