nobu	2017-12-08 15:20:06 +0900 (Fri, 08 Dec 2017)

  New Revision: 61077

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=61077

  Log:
    win32.c: check error code
    
    * win32/win32.c (w32_io_info): check GetFileInformationByHandleEx
      error code to fallback to GetFileInformationByHandle.

  Modified files:
    trunk/win32/win32.c
Index: win32/win32.c
===================================================================
--- win32/win32.c	(revision 61076)
+++ win32/win32.c	(revision 61077)
@@ -8050,7 +8050,12 @@ w32_io_info(VALUE *file, w32_io_info_t * https://github.com/ruby/ruby/blob/trunk/win32/win32.c#L8050
 		st->file_id_p = TRUE;
 		return ret;
 	    }
-	    /* may not work at files on network drives, fallback to old API. */
+	    else if (GetLastError() != ERROR_INVALID_PARAMETER) {
+		CloseHandle(f);
+		return FALSE;
+	    }
+	    /* this API may not wrok at files on non Microsoft SMB
+	     * server, fallback to old API then. */
 	}
 	if (GetFileInformationByHandle(f, &st->info.bhfi)) {
 	    st->file_id_p = FALSE;

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