1 /*
2 * Copyright (C) 2015 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 #include <base/at_exit.h>
18 #include <base/command_line.h>
19 #include <base/logging.h>
20 #include <base/strings/string_util.h>
21 #include <brillo/flag_helper.h>
22 #include <brillo/syslog_logging.h>
23 #include <rootdev.h>
24
25 #include "constants.h"
26 #include "metrics_collector.h"
27
28
29 // Returns the path to the disk stats in the sysfs. Returns the null string if
30 // it cannot find the disk stats file.
31 static
MetricsMainDiskStatsPath()32 const std::string MetricsMainDiskStatsPath() {
33 char dev_path_cstr[PATH_MAX];
34 std::string dev_prefix = "/dev/block/";
35 std::string dev_path;
36
37 int ret = rootdev(dev_path_cstr, sizeof(dev_path_cstr), true, true);
38 if (ret != 0) {
39 LOG(WARNING) << "error " << ret << " determining root device";
40 return "";
41 }
42 dev_path = dev_path_cstr;
43 // Check that rootdev begins with "/dev/block/".
44 if (!base::StartsWith(dev_path, dev_prefix,
45 base::CompareCase::INSENSITIVE_ASCII)) {
46 LOG(WARNING) << "unexpected root device " << dev_path;
47 return "";
48 }
49 return "/sys/class/block/" + dev_path.substr(dev_prefix.length()) + "/stat";
50 }
51
main(int argc,char ** argv)52 int main(int argc, char** argv) {
53 DEFINE_bool(foreground, false, "Don't daemonize");
54
55 DEFINE_string(private_directory, metrics::kMetricsCollectorDirectory,
56 "Path to the private directory used by metrics_collector "
57 "(testing only)");
58 DEFINE_string(shared_directory, metrics::kSharedMetricsDirectory,
59 "Path to the shared metrics directory, used by "
60 "metrics_collector, metricsd and all metrics clients "
61 "(testing only)");
62
63 DEFINE_bool(logtostderr, false, "Log to standard error");
64 DEFINE_bool(logtosyslog, false, "Log to syslog");
65
66 brillo::FlagHelper::Init(argc, argv, "Chromium OS Metrics Daemon");
67
68 int logging_location = (FLAGS_foreground ? brillo::kLogToStderr
69 : brillo::kLogToSyslog);
70 if (FLAGS_logtosyslog)
71 logging_location = brillo::kLogToSyslog;
72
73 if (FLAGS_logtostderr)
74 logging_location = brillo::kLogToStderr;
75
76 // Also log to stderr when not running as daemon.
77 brillo::InitLog(logging_location | brillo::kLogHeader);
78
79 if (FLAGS_logtostderr && FLAGS_logtosyslog) {
80 LOG(ERROR) << "only one of --logtosyslog and --logtostderr can be set";
81 return 1;
82 }
83
84 if (!FLAGS_foreground && daemon(0, 0) != 0) {
85 return errno;
86 }
87
88 MetricsLibrary metrics_lib;
89 metrics_lib.InitWithNoCaching();
90 MetricsCollector daemon;
91 daemon.Init(false,
92 &metrics_lib,
93 MetricsMainDiskStatsPath(),
94 base::FilePath(FLAGS_private_directory),
95 base::FilePath(FLAGS_shared_directory));
96
97 daemon.Run();
98 }
99