| /* |
| * Copyright (C) 2018 The Android Open Source Project |
| * |
| * 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. |
| */ |
| |
| #include "src/profiling/memory/wire_protocol.h" |
| |
| #include "perfetto/base/logging.h" |
| #include "perfetto/base/unix_socket.h" |
| #include "perfetto/base/utils.h" |
| |
| #include <sys/socket.h> |
| #include <sys/types.h> |
| |
| namespace perfetto { |
| namespace profiling { |
| |
| namespace { |
| template <typename T> |
| bool ViewAndAdvance(char** ptr, T** out, const char* end) { |
| if (end - sizeof(T) < *ptr) |
| return false; |
| *out = reinterpret_cast<T*>(*ptr); |
| *ptr += sizeof(T); |
| return true; |
| } |
| } // namespace |
| |
| bool SendWireMessage(int sock, const WireMessage& msg) { |
| uint64_t total_size; |
| struct iovec iovecs[4] = {}; |
| // TODO(fmayer): Maye pack these two. |
| iovecs[0].iov_base = &total_size; |
| iovecs[0].iov_len = sizeof(total_size); |
| iovecs[1].iov_base = const_cast<RecordType*>(&msg.record_type); |
| iovecs[1].iov_len = sizeof(msg.record_type); |
| if (msg.alloc_header) { |
| PERFETTO_DCHECK(msg.record_type == RecordType::Malloc); |
| iovecs[2].iov_base = msg.alloc_header; |
| iovecs[2].iov_len = sizeof(*msg.alloc_header); |
| } else if (msg.free_header) { |
| PERFETTO_DCHECK(msg.record_type == RecordType::Free); |
| iovecs[2].iov_base = msg.free_header; |
| iovecs[2].iov_len = sizeof(*msg.free_header); |
| } else { |
| PERFETTO_DFATAL("Neither alloc_header nor free_header set."); |
| return false; |
| } |
| |
| iovecs[3].iov_base = msg.payload; |
| iovecs[3].iov_len = msg.payload_size; |
| |
| struct msghdr hdr = {}; |
| hdr.msg_iov = iovecs; |
| if (msg.payload) { |
| hdr.msg_iovlen = base::ArraySize(iovecs); |
| total_size = iovecs[1].iov_len + iovecs[2].iov_len + iovecs[3].iov_len; |
| } else { |
| // If we are not sending payload, just ignore that iovec. |
| hdr.msg_iovlen = base::ArraySize(iovecs) - 1; |
| total_size = iovecs[1].iov_len + iovecs[2].iov_len; |
| } |
| |
| ssize_t sent = base::SendMsgAll(sock, &hdr, MSG_NOSIGNAL); |
| return sent == static_cast<ssize_t>(total_size + sizeof(total_size)); |
| } |
| |
| bool ReceiveWireMessage(char* buf, size_t size, WireMessage* out) { |
| RecordType* record_type; |
| char* end = buf + size; |
| if (!ViewAndAdvance<RecordType>(&buf, &record_type, end)) |
| return false; |
| |
| out->payload = nullptr; |
| out->payload_size = 0; |
| out->record_type = *record_type; |
| |
| if (*record_type == RecordType::Malloc) { |
| if (!ViewAndAdvance<AllocMetadata>(&buf, &out->alloc_header, end)) |
| return false; |
| out->payload = buf; |
| if (buf > end) { |
| PERFETTO_DFATAL("Buffer overflowed"); |
| return false; |
| } |
| out->payload_size = static_cast<size_t>(end - buf); |
| } else if (*record_type == RecordType::Free) { |
| if (!ViewAndAdvance<FreeMetadata>(&buf, &out->free_header, end)) |
| return false; |
| } else { |
| PERFETTO_DFATAL("Invalid record type."); |
| return false; |
| } |
| return true; |
| } |
| |
| } // namespace profiling |
| } // namespace perfetto |