Primiano Tucci | a616648 | 2017-11-20 13:05:45 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2017 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #ifndef TRACING_SRC_IPC_POSIX_SHARED_MEMORY_H_ |
| 18 | #define TRACING_SRC_IPC_POSIX_SHARED_MEMORY_H_ |
| 19 | |
| 20 | #include <stddef.h> |
| 21 | |
| 22 | #include <memory> |
| 23 | |
| 24 | #include "base/scoped_file.h" |
| 25 | #include "tracing/core/shared_memory.h" |
| 26 | |
| 27 | namespace perfetto { |
| 28 | |
| 29 | // Implements the SharedMemory and its factory for the posix-based transport. |
Primiano Tucci | a616648 | 2017-11-20 13:05:45 +0000 | [diff] [blame] | 30 | class PosixSharedMemory : public SharedMemory { |
| 31 | public: |
| 32 | class Factory : public SharedMemory::Factory { |
| 33 | public: |
| 34 | ~Factory() override; |
| 35 | std::unique_ptr<SharedMemory> CreateSharedMemory(size_t) override; |
| 36 | }; |
| 37 | |
Primiano Tucci | 69ca126 | 2017-11-20 19:42:22 +0000 | [diff] [blame] | 38 | // Create a brand new SHM region (the service uses this). |
| 39 | static std::unique_ptr<PosixSharedMemory> Create(size_t size); |
| 40 | |
| 41 | // Mmaps a file descriptor to an existing SHM region (the producer uses this). |
| 42 | static std::unique_ptr<PosixSharedMemory> AttachToFd(base::ScopedFile); |
| 43 | |
| 44 | ~PosixSharedMemory() override; |
| 45 | |
| 46 | int fd() const { return fd_.get(); } |
| 47 | |
Primiano Tucci | a616648 | 2017-11-20 13:05:45 +0000 | [diff] [blame] | 48 | // SharedMemory implementation. |
Primiano Tucci | 69ca126 | 2017-11-20 19:42:22 +0000 | [diff] [blame] | 49 | void* start() const override { return start_; } |
| 50 | size_t size() const override { return size_; } |
| 51 | |
| 52 | private: |
| 53 | static std::unique_ptr<PosixSharedMemory> MapFD(base::ScopedFile, size_t); |
| 54 | |
| 55 | PosixSharedMemory(void* start, size_t size, base::ScopedFile); |
| 56 | PosixSharedMemory(const PosixSharedMemory&) = delete; |
| 57 | PosixSharedMemory& operator=(const PosixSharedMemory&) = delete; |
| 58 | |
| 59 | void* const start_; |
| 60 | const size_t size_; |
| 61 | base::ScopedFile fd_; |
Primiano Tucci | a616648 | 2017-11-20 13:05:45 +0000 | [diff] [blame] | 62 | }; |
| 63 | |
| 64 | } // namespace perfetto |
| 65 | |
| 66 | #endif // TRACING_SRC_IPC_POSIX_SHARED_MEMORY_H_ |