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 INCLUDE_PERFETTO_TRACING_CORE_BASIC_TYPES_H_ 18 #define INCLUDE_PERFETTO_TRACING_CORE_BASIC_TYPES_H_ 19 20 #include <stddef.h> 21 #include <stdint.h> 22 #include <sys/types.h> 23 24 namespace perfetto { 25 26 // Unique within the scope of the tracing service. 27 using TracingSessionID = uint64_t; 28 29 // Unique within the scope of the tracing service. 30 using ProducerID = uint16_t; 31 32 // Unique within the scope of the tracing service. 33 using DataSourceInstanceID = uint64_t; 34 35 // Unique within the scope of a Producer. 36 using WriterID = uint16_t; 37 38 // Unique within the scope of the tracing service. 39 using FlushRequestID = uint64_t; 40 41 // We need one FD per producer and we are not going to be able to keep > 64k FDs 42 // open in the service. 43 static constexpr ProducerID kMaxProducerID = static_cast<ProducerID>(-1); 44 45 // 1024 Writers per producer seems a resonable bound. This reduces the ability 46 // to memory-DoS the service by having to keep track of too many writer IDs. 47 static constexpr WriterID kMaxWriterID = static_cast<WriterID>((1 << 10) - 1); 48 49 // Unique within the scope of a {ProducerID, WriterID} tuple. 50 using ChunkID = uint32_t; 51 static constexpr ChunkID kMaxChunkID = static_cast<ChunkID>(-1); 52 53 // Unique within the scope of the tracing service. 54 using BufferID = uint16_t; 55 56 // Keep this in sync with SharedMemoryABI::PageHeader::target_buffer. 57 static constexpr BufferID kMaxTraceBufferID = static_cast<BufferID>(-1); 58 59 // TODO(primiano): temporary. The buffer page size should be configurable by 60 // consumers. 61 static constexpr size_t kBufferPageSize = 8192; 62 63 constexpr uid_t kInvalidUid = static_cast<uid_t>(-1); 64 65 } // namespace perfetto 66 67 #endif // INCLUDE_PERFETTO_TRACING_CORE_BASIC_TYPES_H_ 68