be/src/vec/common/mremap.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.
// 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
}