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-rw-r--r--win/tclWinInit.c18
1 files changed, 14 insertions, 4 deletions
diff --git a/win/tclWinInit.c b/win/tclWinInit.c
index 81d762f..08ef1ed 100644
--- a/win/tclWinInit.c
+++ b/win/tclWinInit.c
@@ -563,7 +563,8 @@ TclpSetVariables(
SYSTEM_INFO info;
OemId oemId;
} sys;
- OSVERSIONINFOW osInfo;
+ static OSVERSIONINFOW osInfo;
+ static int osInfoInitialized = 0;
Tcl_DString ds;
WCHAR szUserName[UNLEN+1];
DWORD cchUserNameLen = UNLEN;
@@ -571,9 +572,18 @@ TclpSetVariables(
Tcl_SetVar2Ex(interp, "tclDefaultLibrary", NULL,
TclGetProcessGlobalValue(&defaultLibraryDir), TCL_GLOBAL_ONLY);
- osInfo.dwOSVersionInfoSize = sizeof(OSVERSIONINFOW);
- GetVersionExW(&osInfo);
-
+ if (!osInfoInitialized) {
+ HANDLE handle = LoadLibraryW(L"NTDLL");
+ int(*getversion)(void *) = (int(*)(void *))GetProcAddress(handle, "RtlGetVersion");
+ osInfo.dwOSVersionInfoSize = sizeof(OSVERSIONINFOW);
+ if (!getversion || getversion(&osInfo)) {
+ GetVersionExW(&osInfo);
+ }
+ if (handle) {
+ FreeLibrary(handle);
+ }
+ osInfoInitialized = 1;
+ }
GetSystemInfo(&sys.info);
/*