diff options
Diffstat (limited to 'logd/RecordingLogBuffer.cpp')
| -rw-r--r-- | logd/RecordingLogBuffer.cpp | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/logd/RecordingLogBuffer.cpp b/logd/RecordingLogBuffer.cpp new file mode 100644 index 0000000000..f5991f3701 --- /dev/null +++ b/logd/RecordingLogBuffer.cpp @@ -0,0 +1,62 @@ +/* + * Copyright (C) 2020 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 "RecordingLogBuffer.h" + +#include <android-base/file.h> + +static void WriteLogMessage(int fd, const RecordedLogMessage& meta, const std::string& msg) { + android::base::WriteFully(fd, &meta, sizeof(meta)); + android::base::WriteFully(fd, msg.c_str(), meta.msg_len); +} + +void RecordingLogBuffer::RecordLogMessage(log_id_t log_id, log_time realtime, uid_t uid, pid_t pid, + pid_t tid, const char* msg, uint16_t len) { + auto lock = std::lock_guard{lock_}; + if (len > LOGGER_ENTRY_MAX_PAYLOAD) { + len = LOGGER_ENTRY_MAX_PAYLOAD; + } + + RecordedLogMessage recorded_log_message = { + .uid = uid, + .pid = static_cast<uint32_t>(pid), + .tid = static_cast<uint32_t>(tid), + .realtime = realtime, + .msg_len = len, + .log_id = static_cast<uint8_t>(log_id), + }; + + if (!fd_.ok()) { + fd_.reset(open("/data/misc/logd/recorded-messages", + O_WRONLY | O_CREAT | O_APPEND | O_CLOEXEC, 0666)); + if (!fd_.ok()) { + since_boot_messages_.emplace_back(recorded_log_message, std::string(msg, len)); + return; + } else { + for (const auto& [meta, msg] : since_boot_messages_) { + WriteLogMessage(fd_.get(), meta, msg); + } + } + } + + WriteLogMessage(fd_.get(), recorded_log_message, std::string(msg, len)); +} + +int RecordingLogBuffer::Log(log_id_t log_id, log_time realtime, uid_t uid, pid_t pid, pid_t tid, + const char* msg, uint16_t len) { + RecordLogMessage(log_id, realtime, uid, pid, tid, msg, len); + return SimpleLogBuffer::Log(log_id, realtime, uid, pid, tid, msg, len); +}
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