| // checking for mmap() and munmap() in <sys/mman.h> |
| |
| /*************************************************************************** |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed |
| * with this work for additional information regarding copyright |
| * ownership. The ASF licenses this file to you 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. |
| * |
| * Copyright 2008 Rogue Wave Software, Inc. |
| * |
| **************************************************************************/ |
| |
| #include <sys/mman.h> |
| #include <sys/types.h> |
| |
| |
| void* map_file (int fd) |
| { |
| return mmap (0, 4096, PROT_READ, MAP_PRIVATE, fd, 0); |
| } |
| |
| |
| int main (int argc, char *argv[]) |
| { |
| // avoid executing the code except when one or more command |
| // line arguments have been specified |
| if (argc < 2) |
| return 0; |
| |
| void *p = map_file (argc); |
| munmap (p, 0); |
| |
| return 0; |
| } |