Don't leave Windows 2000 behind.

* autoload.cc (GetSystemWow64DirectoryW): Define.
	(GetVolumePathNamesForVolumeNameW): Define.
	* fhandler_process.cc (get_volume_path_names_for_volume_name): New
	static function to workaround missing GetVolumePathNamesForVolumeNameW
	function in Windows 2000.
	(dos_drive_mappings::dos_drive_mappings): Call
	get_volume_path_names_for_volume_name instead of
	GetVolumePathNamesForVolumeNameW.

winsup/cygwin/ChangeLog

@@ -1,3 +1,14 @@
+2011-12-14  Corinna Vinschen  <vinschen@redhat.com>
+
+	* autoload.cc (GetSystemWow64DirectoryW): Define.
+	(GetVolumePathNamesForVolumeNameW): Define.
+	* fhandler_process.cc (get_volume_path_names_for_volume_name): New
+	static function to workaround missing GetVolumePathNamesForVolumeNameW
+	function in Windows 2000.
+	(dos_drive_mappings::dos_drive_mappings): Call
+	get_volume_path_names_for_volume_name instead of
+	GetVolumePathNamesForVolumeNameW.
+
 2011-12-13  Christopher Faylor  <me.cygwin2011@cgf.cx>
 
 	* dcrt0.cc (init_windows_system_directory): Record

winsup/cygwin/autoload.cc

@@ -392,6 +392,8 @@ LoadDLLfunc (GetUdpTable, 12, iphlpapi)
 LoadDLLfuncEx (AttachConsole, 4, kernel32, 1)
 LoadDLLfuncEx (GetModuleHandleExW, 12, kernel32, 1)
 LoadDLLfuncEx (GetNamedPipeClientProcessId, 8, kernel32, 1)
+LoadDLLfuncEx (GetSystemWow64DirectoryW, 8, kernel32, 1)
+LoadDLLfuncEx (GetVolumePathNamesForVolumeNameW, 16, kernel32, 1)
 LoadDLLfunc (LocaleNameToLCID, 8, kernel32)
 
 LoadDLLfunc (WNetCloseEnum, 4, mpr)

winsup/cygwin/fhandler_process.cc

@@ -544,6 +544,41 @@ format_process_winexename (void *data, char *&destbuf)
   return len + 1;
 }
 
+static bool
+get_volume_path_names_for_volume_name (LPCWSTR vol, LPWSTR mounts)
+{
+  DWORD len;
+  if (GetVolumePathNamesForVolumeNameW (vol, mounts, NT_MAX_PATH, &len))
+    return true;
+
+  /* Windows 2000 doesn't have GetVolumePathNamesForVolumeNameW.
+     Just assume that mount points are not longer than MAX_PATH. */
+  WCHAR drives[MAX_PATH], dvol[MAX_PATH], mp[MAX_PATH + 3];
+  if (!GetLogicalDriveStringsW (MAX_PATH, drives))
+    return false;
+  for (PWCHAR drive = drives; *drive; drive = wcschr (drive, '\0') + 1)
+    {
+      if (!GetVolumeNameForVolumeMountPointW (drive, dvol, MAX_PATH))
+	continue;
+      if (!wcscasecmp (vol, dvol))
+	mounts = wcpcpy (mounts, drive) + 1;
+      wcscpy (mp, drive);
+      HANDLE h = FindFirstVolumeMountPointW (dvol, mp + 3, MAX_PATH);
+      if (h == INVALID_HANDLE_VALUE)
+	continue;
+      do
+	{
+	  if (GetVolumeNameForVolumeMountPointW (mp, dvol, MAX_PATH))
+	    if (!wcscasecmp (vol, dvol))
+	      mounts = wcpcpy (mounts, drive) + 1;
+	}
+      while (FindNextVolumeMountPointW (h, mp, MAX_PATH));
+      FindVolumeMountPointClose (h);
+    }
+  *mounts = L'\0';
+  return true;
+}
+
 struct dos_drive_mappings
 {
   struct mapping
@@ -573,9 +608,8 @@ struct dos_drive_mappings
     else
       do
 	{
-	  DWORD len;
 	  /* Skip drives which are not mounted. */
-	  if (!GetVolumePathNamesForVolumeNameW (vol, mounts, NT_MAX_PATH, &len)
+	  if (!get_volume_path_names_for_volume_name (vol, mounts)
 	      || mounts[0] == L'\0')
 	    continue;
 	  *wcsrchr (vol, L'\\') = L'\0';