// 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.

// This file is copied from

// https://github.com/ClickHouse/ClickHouse/blob/master/base/base/mremap.h

// and modified by Doris

#pragma once

#if !defined(_MSC_VER)

#include <sys/mman.h>

#endif

#ifdef MREMAP_MAYMOVE

#define HAS_MREMAP 1

#else

#define HAS_MREMAP 0

#endif

/// You can forcely disable mremap by defining DISABLE_MREMAP to 1 before including this file.

#ifndef DISABLE_MREMAP

#if HAS_MREMAP

#define DISABLE_MREMAP 0

#else

#define DISABLE_MREMAP 1

#endif

#endif

/// Implement mremap with mmap/memcpy/munmap.

void* mremap_fallback(void* old_address, size_t old_size, size_t new_size, int flags, int mmap_prot,

                      int mmap_flags, int mmap_fd, off_t mmap_offset);

#if !HAS_MREMAP

#define MREMAP_MAYMOVE 1

inline void* mremap(void* old_address, size_t old_size, size_t new_size, int flags = 0,

                    int mmap_prot = 0, int mmap_flags = 0, int mmap_fd = -1,

                    off_t mmap_offset = 0) {

    return mremap_fallback(old_address, old_size, new_size, flags, mmap_prot, mmap_flags, mmap_fd,

                           mmap_offset);

}

#endif

inline void* clickhouse_mremap(void* old_address, size_t old_size, size_t new_size, int flags = 0,

                               [[maybe_unused]] int mmap_prot = 0,

                               [[maybe_unused]] int mmap_flags = 0,

                               [[maybe_unused]] int mmap_fd = -1,

                               [[maybe_unused]] off_t mmap_offset = 0) {

#if DISABLE_MREMAP

    return mremap_fallback(old_address, old_size, new_size, flags, mmap_prot, mmap_flags, mmap_fd,

                           mmap_offset);

#else

    return mremap(old_address, old_size, new_size, flags

#if !defined(MREMAP_FIXED)

                  ,

                  mmap_prot, mmap_flags, mmap_fd, mmap_offset

#endif

    );

#endif

}