granicus.if.org Git - postgresql/blob - src/interfaces/odbc/psqlodbc.c

   1 /*--------
   2  * Module:                      psqlodbc.c
   3  *
   4  * Description:         This module contains the main entry point (DllMain)
   5  *                                      for the library.  It also contains functions to get
   6  *                                      and set global variables for the driver in the registry.
   7  *
   8  * Classes:                     n/a
   9  *
  10  * API functions:       none
  11  *
  12  * Comments:            See "notice.txt" for copyright and license information.
  13  *--------
  14  */
  15
  16 #include "psqlodbc.h"
  17 #include "dlg_specific.h"
  18
  19 #ifdef WIN32
  20 #include <winsock.h>
  21 #endif
  22
  23 GLOBAL_VALUES globals;
  24
  25 RETCODE SQL_API SQLDummyOrdinal(void);
  26
  27 #ifdef WIN32
  28 HINSTANCE NEAR s_hModule;               /* Saved module handle. */
  29
  30 /*      This is where the Driver Manager attaches to this Driver */
  31 BOOL            WINAPI
  32 DllMain(HANDLE hInst, ULONG ul_reason_for_call, LPVOID lpReserved)
  33 {
  34         WORD            wVersionRequested;
  35         WSADATA         wsaData;
  36
  37         switch (ul_reason_for_call)
  38         {
  39                 case DLL_PROCESS_ATTACH:
  40                         s_hModule = hInst;      /* Save for dialog boxes */
  41
  42                         /* Load the WinSock Library */
  43                         wVersionRequested = MAKEWORD(1, 1);
  44
  45                         if (WSAStartup(wVersionRequested, &wsaData))
  46                                 return FALSE;
  47
  48                         /* Verify that this is the minimum version of WinSock */
  49                         if (LOBYTE(wsaData.wVersion) != 1 ||
  50                                 HIBYTE(wsaData.wVersion) != 1)
  51                         {
  52                                 WSACleanup();
  53                                 return FALSE;
  54                         }
  55
  56                         getCommonDefaults(DBMS_NAME, ODBCINST_INI, NULL);
  57                         break;
  58
  59                 case DLL_THREAD_ATTACH:
  60                         break;
  61
  62                 case DLL_PROCESS_DETACH:
  63                         WSACleanup();
  64                         return TRUE;
  65
  66                 case DLL_THREAD_DETACH:
  67                         break;
  68
  69                 default:
  70                         break;
  71         }
  72
  73         return TRUE;
  74
  75         UNREFERENCED_PARAMETER(lpReserved);
  76 }
  77
  78 #else                                                   /* not WIN32 */
  79
  80 #ifndef TRUE
  81 #define TRUE    (BOOL)1
  82 #endif
  83 #ifndef FALSE
  84 #define FALSE   (BOOL)0
  85 #endif
  86
  87 #ifdef __GNUC__
  88
  89 /* This function is called at library initialization time.      */
  90
  91 static BOOL
  92 __attribute__((constructor))
  93 init(void)
  94 {
  95         getCommonDefaults(DBMS_NAME, ODBCINST_INI, NULL);
  96         return TRUE;
  97 }
  98
  99 #else                                                   /* not __GNUC__ */
 100
 101 /*
 102  * These two functions do shared library initialziation on UNIX, well at least
 103  * on Linux. I don't know about other systems.
 104  */
 105 BOOL
 106 _init(void)
 107 {
 108         getCommonDefaults(DBMS_NAME, ODBCINST_INI, NULL);
 109         return TRUE;
 110 }
 111
 112 BOOL
 113 _fini(void)
 114 {
 115         return TRUE;
 116 }
 117
 118 #endif   /* not __GNUC__ */
 119
 120 #endif   /* not WIN32 */
 121
 122
 123 /*
 124  *      This function is used to cause the Driver Manager to
 125  *      call functions by number rather than name, which is faster.
 126  *      The ordinal value of this function must be 199 to have the
 127  *      Driver Manager do this.  Also, the ordinal values of the
 128  *      functions must match the value of fFunction in SQLGetFunctions()
 129  */
 130 RETCODE SQL_API
 131 SQLDummyOrdinal(void)
 132 {
 133         return SQL_SUCCESS;
 134 }