Merging upstream version 1.2.1.

Signed-off-by: Daniel Baumann <daniel@debian.org>

src/core/file.lua

@@ -0,0 +1,37 @@
+-- Copyright (c) 2018-2021, OARC, Inc.
+-- All rights reserved.
+--
+-- This file is part of dnsjit.
+--
+-- dnsjit is free software: you can redistribute it and/or modify
+-- it under the terms of the GNU General Public License as published by
+-- the Free Software Foundation, either version 3 of the License, or
+-- (at your option) any later version.
+--
+-- dnsjit is distributed in the hope that it will be useful,
+-- but WITHOUT ANY WARRANTY; without even the implied warranty of
+-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+-- GNU General Public License for more details.
+--
+-- You should have received a copy of the GNU General Public License
+-- along with dnsjit.  If not, see <http://www.gnu.org/licenses/>.
+
+-- dnsjit.core.file
+-- OS file operations
+--   require("dnsjit.core.file")
+--   local ffi = require("ffi")
+--   if ffi.C.core_file_exists("path/file") == 0 then
+--       ...
+--   end
+--
+-- Module that exposes some file operations that are missing from Lua.
+-- .SS C functions
+-- .TP
+-- core_file_exists(path/filename)
+-- Function that takes a string and uses
+-- .B stat()
+-- to check if that path/filename exists.
+-- Returns zero if it exists.
+module(...,package.seeall)
+
+require("dnsjit.core.file_h")