SharedMemory.h

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// Copyright 2024 libsese
//
// 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.
 
#pragma once
 
#include <sese/Config.h>
#include <sese/util/Result.h>
#ifdef WIN32
#else
#include <sys/shm.h>
#endif
 
namespace sese::system {
 
class SharedMemory final {
public:
    using Ptr = std::unique_ptr<SharedMemory>;
 
    static SharedMemory::Ptr create(const char *name, size_t size) noexcept;
 
    static Result<Ptr> createEx(const char *name, size_t size) noexcept;
 
    static SharedMemory::Ptr use(const char *name) noexcept;
 
    static Result<Ptr> useEx(const char *name) noexcept;
 
    ~SharedMemory() noexcept;
    void *getBuffer() noexcept;
 
private:
    SharedMemory() = default;
 
private:
#ifdef WIN32
    void *hMapFile = nullptr;
#else
    int id{};
    static key_t name2key(const char *name) noexcept;
#endif
    void *buffer = nullptr;
    bool isOwner{};
};
} // namespace sese::system