// util header file//// Copyright 2017 Google Inc.//// Licensed under the Apache License, Version 2.0 (the "License");// you may not use this file except in compliance with the License.// You may obtain a copy of the License at////      http://www.apache.org/licenses/LICENSE-2.0//// Unless required by applicable law or agreed to in writing, software// distributed under the License is distributed on an "AS IS" BASIS,// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.// See the License for the specific language governing permissions and// limitations under the License. #include <stdlib.h>  // for size_t // Declare it - we'll either use ours or whatever autoconf found.// Including <bsd/string.h> would maybe be nicer, but it doesn't seem to// actually define this symbol unless we set _GNU_SOURCE.void explicit_bzero(void *s, size_t len);