f05ab40ab9
This CL replaces the deprecated int* and uint* types from 'base/basictypes.h' with the int*_t and uint*_t types from 'stdint.h'. BUG=chromium:401356 TEST=`FEATURES=test emerge-$BOARD metrics` Change-Id: Ie5a69edba2c8a9d5185bbc548ed70a5b121c3e3b Reviewed-on: https://chromium-review.googlesource.com/211381 Reviewed-by: Mike Frysinger <vapier@chromium.org> Tested-by: Ben Chan <benchan@chromium.org> Commit-Queue: Ben Chan <benchan@chromium.org>
101 lines
2.5 KiB
C++
101 lines
2.5 KiB
C++
// Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "metrics/persistent_integer.h"
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#include <fcntl.h>
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#include <base/logging.h>
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#include <base/posix/eintr_wrapper.h>
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#include "metrics/metrics_library.h"
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namespace {
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// The directory for the persistent storage.
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const char kBackingFilesDirectory[] = "/var/lib/metrics/";
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}
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namespace chromeos_metrics {
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// Static class member instantiation.
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bool PersistentInteger::testing_ = false;
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PersistentInteger::PersistentInteger(const std::string& name) :
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value_(0),
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version_(kVersion),
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name_(name),
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synced_(false) {
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if (testing_) {
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backing_file_name_ = name_;
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} else {
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backing_file_name_ = kBackingFilesDirectory + name_;
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}
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}
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PersistentInteger::~PersistentInteger() {}
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void PersistentInteger::Set(int64_t value) {
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value_ = value;
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Write();
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}
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int64_t PersistentInteger::Get() {
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// If not synced, then read. If the read fails, it's a good idea to write.
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if (!synced_ && !Read())
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Write();
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return value_;
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}
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int64_t PersistentInteger::GetAndClear() {
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int64_t v = Get();
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Set(0);
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return v;
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}
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void PersistentInteger::Add(int64_t x) {
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Set(Get() + x);
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}
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void PersistentInteger::Write() {
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int fd = HANDLE_EINTR(open(backing_file_name_.c_str(),
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O_WRONLY | O_CREAT | O_TRUNC,
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S_IWUSR | S_IRUSR | S_IRGRP | S_IROTH));
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PCHECK(fd >= 0) << "cannot open " << backing_file_name_ << " for writing";
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PCHECK((HANDLE_EINTR(write(fd, &version_, sizeof(version_))) ==
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sizeof(version_)) &&
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(HANDLE_EINTR(write(fd, &value_, sizeof(value_))) ==
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sizeof(value_)))
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<< "cannot write to " << backing_file_name_;
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close(fd);
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synced_ = true;
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}
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bool PersistentInteger::Read() {
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int fd = HANDLE_EINTR(open(backing_file_name_.c_str(), O_RDONLY));
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if (fd < 0) {
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PLOG(WARNING) << "cannot open " << backing_file_name_ << " for reading";
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return false;
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}
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int32_t version;
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int64_t value;
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bool read_succeeded = false;
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if (HANDLE_EINTR(read(fd, &version, sizeof(version))) == sizeof(version) &&
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version == version_ &&
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HANDLE_EINTR(read(fd, &value, sizeof(value))) == sizeof(value)) {
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value_ = value;
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read_succeeded = true;
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synced_ = true;
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}
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close(fd);
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return read_succeeded;
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}
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void PersistentInteger::SetTestingMode(bool testing) {
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testing_ = testing;
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}
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} // namespace chromeos_metrics
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