* shared.cc (shared_info::init_obcaseinsensitive): Check actual state

	of case sensitivity on post-Windows 2000 systems.
	* wincap.h (wincaps::kernel_is_always_casesensitive): New element.
	* wincap.cc: Implement above element throughout.

1 files changed, 35 insertions, 14 deletions

diff --git a/winsup/cygwin/shared.cc b/winsup/cygwin/shared.cc
index 86f93c269..7a0b2510b 100644
--- a/winsup/cygwin/shared.cc
+++ b/winsup/cygwin/shared.cc
@@ -286,23 +286,44 @@ shared_destroy ()
   UnmapViewOfFile (user_shared);
 }
 
-/* Initialize obcaseinsensitive.  Default to case insensitive on pre-XP. */
+/* Initialize obcaseinsensitive.*/
 void
 shared_info::init_obcaseinsensitive ()
 {
-  NTSTATUS status;
-  DWORD def_obcaseinsensitive = 1;
-
-  obcaseinsensitive = def_obcaseinsensitive;
-  RTL_QUERY_REGISTRY_TABLE tab[2] = {
-    { NULL, RTL_QUERY_REGISTRY_DIRECT | RTL_QUERY_REGISTRY_NOSTRING,
-      L"obcaseinsensitive", &obcaseinsensitive, REG_DWORD,
-      &def_obcaseinsensitive, sizeof (DWORD) },
-    { NULL, 0, NULL, NULL, 0, NULL, 0 }
-  };
-  status = RtlQueryRegistryValues (RTL_REGISTRY_CONTROL,
-				   L"Session Manager\\kernel",
-				   tab, NULL, NULL);
+  if (wincap.kernel_is_always_casesensitive ())
+    {
+      /* Only Windows 2000.  Default to case insensitive unless the user
+      	 sets the obcaseinsensitive registry value explicitely to 0. */
+      DWORD def_obcaseinsensitive = 1;
+
+      obcaseinsensitive = def_obcaseinsensitive;
+      RTL_QUERY_REGISTRY_TABLE tab[2] = {
+	{ NULL, RTL_QUERY_REGISTRY_DIRECT | RTL_QUERY_REGISTRY_NOSTRING,
+	  L"obcaseinsensitive", &obcaseinsensitive, REG_DWORD,
+	  &def_obcaseinsensitive, sizeof (DWORD) },
+	{ NULL, 0, NULL, NULL, 0, NULL, 0 }
+      };
+      RtlQueryRegistryValues (RTL_REGISTRY_CONTROL,
+			      L"Session Manager\\kernel",
+			      tab, NULL, NULL);
+    }
+  else
+    {
+      /* Instead of reading the obcaseinsensitive registry value, test the
+	 actual state of case sensitivity handling in the kernel. */
+      UNICODE_STRING sysroot;
+      OBJECT_ATTRIBUTES attr;
+      HANDLE h;
+
+      RtlInitUnicodeString (&sysroot, L"\\SYSTEMROOT");
+      InitializeObjectAttributes (&attr, &sysroot, 0, NULL, NULL);
+      /* NtOpenSymbolicLinkObject returns STATUS_ACCESS_DENIED when called
+      	 with a 0 access mask.  However, if the kernel is case sensitive,
+	 it returns STATUS_OBJECT_NAME_NOT_FOUND because we used the incorrect
+	 case for the filename (It's actually "\\SystemRoot"). */
+      obcaseinsensitive = NtOpenSymbolicLinkObject (&h, 0, &attr)
+			  != STATUS_OBJECT_NAME_NOT_FOUND;
+    }
 }
 
 void inline