std::vector<BootEventRecordStore::BootEventRecord> BootEventRecordStore::
GetAllBootEvents() const {
std::vector<BootEventRecord> events;
std::unique_ptr<DIR, decltype(&closedir)> dir(opendir(store_path_.c_str()), closedir);
// This case could happen due to external manipulation of the filesystem,
// so crash out if the record store doesn't exist.
CHECK_NE(static_cast<DIR*>(nullptr), dir.get());
struct dirent* entry;
while ((entry = readdir(dir.get())) != NULL) {
// Only parse regular files.
if (entry->d_type != DT_REG) {
continue;
}
const std::string event = entry->d_name;
const std::string record_path = GetBootEventPath(event);
int32_t uptime;
if (!ParseRecordEventTime(record_path, &uptime)) {
LOG(ERROR) << "Failed to parse boot time record: " << record_path;
continue;
}
events.push_back(std::make_pair(event, uptime));
}
return events;
}
bool BootEventRecordStore::GetBootEvent(
const std::string& event, BootEventRecord* record) const {
CHECK_NE(static_cast<BootEventRecord*>(nullptr), record);
CHECK(!event.empty());
const std::string record_path = GetBootEventPath(event);
int32_t uptime;
if (!ParseRecordEventTime(record_path, &uptime)) {
LOG(ERROR) << "Failed to parse boot time record: " << record_path;
return false;
}
*record = std::make_pair(event, uptime);
return true;
}
// The implementation of AddBootEventValue makes use of the mtime file
// attribute to store the value associated with a boot event in order to
// optimize on-disk size requirements and small-file thrashing.
void BootEventRecordStore::AddBootEventWithValue(
const std::string& name, int32_t value) {
std::string record_path = GetBootEventPath(name);
if (creat(record_path.c_str(), S_IRUSR | S_IWUSR) == -1) {
PLOG(ERROR) << "Failed to create " << record_path;
}
// Fill out the stat structure for |record_path| in order to get the atime to
// set in the utime() call.
struct stat file_stat;
if (stat(record_path.c_str(), &file_stat) == -1) {
PLOG(ERROR) << "Failed to read " << record_path;
}
// Set the |modtime| of the file to store the value of the boot event while
// preserving the |actime| (as read by stat).
struct utimbuf times = {/* actime */ file_stat.st_atime, /* modtime */ value};
if (utime(record_path.c_str(), ×) == -1) {
PLOG(ERROR) << "Failed to set mtime for " << record_path;
}
}
// The implementation of AddBootEventValue makes use of the mtime file
// attribute to store the value associated with a boot event in order to
// optimize on-disk size requirements and small-file thrashing.
void BootEventRecordStore::AddBootEventWithValue(
const std::string& event, int32_t value) {
std::string record_path = GetBootEventPath(event);
int record_fd = creat(record_path.c_str(), S_IRUSR | S_IWUSR);
if (record_fd == -1) {
PLOG(ERROR) << "Failed to create " << record_path;
return;
}
// Writing the value as content in the record file is a debug measure to
// ensure the validity of the file mtime value, i.e., to check that the record
// file mtime values are not changed once set.
// TODO(jhawkins): Remove this block.
if (!android::base::WriteStringToFd(std::to_string(value), record_fd)) {
PLOG(ERROR) << "Failed to write value to " << record_path;
close(record_fd);
return;
}
// Fill out the stat structure for |record_path| in order to get the atime to
// set in the utime() call.
struct stat file_stat;
if (stat(record_path.c_str(), &file_stat) == -1) {
PLOG(ERROR) << "Failed to read " << record_path;
close(record_fd);
return;
}
// Set the |modtime| of the file to store the value of the boot event while
// preserving the |actime| (as read by stat).
struct utimbuf times = {/* actime */ file_stat.st_atime, /* modtime */ value};
if (utime(record_path.c_str(), ×) == -1) {
PLOG(ERROR) << "Failed to set mtime for " << record_path;
close(record_fd);
return;
}
close(record_fd);
}
void BootEventRecordStore::AddBootEvent(const std::string& name) {
std::string uptime_str;
if (!android::base::ReadFileToString("/proc/uptime", &uptime_str)) {
LOG(ERROR) << "Failed to read /proc/uptime";
}
std::string record_path = GetBootEventPath(name);
if (creat(record_path.c_str(), S_IRUSR | S_IWUSR) == -1) {
PLOG(ERROR) << "Failed to create " << record_path;
}
struct stat file_stat;
if (stat(record_path.c_str(), &file_stat) == -1) {
PLOG(ERROR) << "Failed to read " << record_path;
}
// Cast intentionally rounds down.
time_t uptime = static_cast<time_t>(strtod(uptime_str.c_str(), NULL));
struct utimbuf times = {file_stat.st_atime, uptime};
if (utime(record_path.c_str(), ×) == -1) {
PLOG(ERROR) << "Failed to set mtime for " << record_path;
}
}
