/*
* 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/perfetto_cmd/perfetto_cmd.h"
#include <dlfcn.h>
#include <fcntl.h>
#include <getopt.h>
#include <signal.h>
#include <stdio.h>
#include <sys/stat.h>
#include <time.h>
#include <unistd.h>
#include <fstream>
#include <iostream>
#include <iterator>
#include <sstream>
#include "perfetto/base/file_utils.h"
#include "perfetto/base/logging.h"
#include "perfetto/base/string_view.h"
#include "perfetto/base/time.h"
#include "perfetto/base/utils.h"
#include "perfetto/config/trace_config.pb.h"
#include "perfetto/protozero/proto_utils.h"
#include "perfetto/traced/traced.h"
#include "perfetto/tracing/core/basic_types.h"
#include "perfetto/tracing/core/data_source_config.h"
#include "perfetto/tracing/core/data_source_descriptor.h"
#include "perfetto/tracing/core/trace_config.h"
#include "perfetto/tracing/core/trace_packet.h"
#include "src/perfetto_cmd/config.h"
#include "src/perfetto_cmd/packet_writer.h"
#include "src/perfetto_cmd/pbtxt_to_pb.h"
#include "src/perfetto_cmd/trigger_producer.h"
#include "src/tracing/ipc/default_socket.h"
#include "google/protobuf/io/zero_copy_stream_impl_lite.h"
#if PERFETTO_BUILDFLAG(PERFETTO_ANDROID_BUILD)
#include <sys/sendfile.h>
#include <android/os/DropBoxManager.h>
#include <utils/Looper.h>
#include <utils/StrongPointer.h>
#include "src/android_internal/incident_service.h"
#endif // PERFETTO_BUILDFLAG(PERFETTO_ANDROID_BUILD)
namespace perfetto {
namespace {
perfetto::PerfettoCmd* g_consumer_cmd;
class LoggingErrorReporter : public ErrorReporter {
public:
LoggingErrorReporter(std::string file_name, const char* config)
: file_name_(file_name), config_(config) {}
void AddError(size_t row,
size_t column,
size_t length,
const std::string& message) override {
parsed_successfully_ = false;
std::string line = ExtractLine(row - 1).ToStdString();
if (!line.empty() && line[line.length() - 1] == '\n') {
line.erase(line.length() - 1);
}
std::string guide(column + length, ' ');
for (size_t i = column; i < column + length; i++) {
guide[i - 1] = i == column ? '^' : '~';
}
fprintf(stderr, "%s:%zu:%zu error: %s\n", file_name_.c_str(), row, column,
message.c_str());
fprintf(stderr, "%s\n", line.c_str());
fprintf(stderr, "%s\n", guide.c_str());
}
bool Success() const { return parsed_successfully_; }
private:
base::StringView ExtractLine(size_t line) {
const char* start = config_;
const char* end = config_;
for (size_t i = 0; i < line + 1; i++) {
start = end;
char c;
while ((c = *end++) && c != '\n')
;
}
return base::StringView(start, static_cast<size_t>(end - start));
}
bool parsed_successfully_ = true;
std::string file_name_;
const char* config_;
};
bool ParseTraceConfigPbtxt(const std::string& file_name,
const std::string& pbtxt,
protos::TraceConfig* config) {
LoggingErrorReporter reporter(file_name, pbtxt.c_str());
std::vector<uint8_t> buf = PbtxtToPb(pbtxt, &reporter);
if (!reporter.Success())
return false;
if (!config->ParseFromArray(buf.data(), static_cast<int>(buf.size())))
return false;
return true;
}
#if PERFETTO_BUILDFLAG(PERFETTO_ANDROID_BUILD)
static bool StartIncidentReport(const TraceConfig::IncidentReportConfig& cfg) {
using ScopedDlHandle = base::ScopedResource<void*, dlclose, nullptr>;
static const char kLibName[] = "libperfetto_android_internal.so";
ScopedDlHandle handle(dlopen(kLibName, RTLD_NOW));
PERFETTO_CHECK(handle);
void* fn = dlsym(*handle, "StartIncidentReport");
PERFETTO_CHECK(fn);
auto start_incident =
reinterpret_cast<decltype(&android_internal::StartIncidentReport)>(fn);
return start_incident(cfg.destination_package().c_str(),
cfg.destination_class().c_str(), cfg.privacy_level());
}
#else
static bool StartIncidentReport(const TraceConfig::IncidentReportConfig&) {
PERFETTO_FATAL("should not be called");
};
#endif
} // namespace
// Directory for temporary trace files. Note that this is automatically created
// by the system by setting setprop persist.traced.enable=1.
const char* kTempDropBoxTraceDir = "/data/misc/perfetto-traces";
#if PERFETTO_BUILDFLAG(PERFETTO_ANDROID_BUILD)
// If writing into an incident, the trace is written to a hardcoded location
// that is known to incidentd.
static const char kIncidentTraceLocation[] =
"/data/misc/perfetto-traces/incident-trace";
static const char kTempIncidentTraceLocation[] =
"/data/misc/perfetto-traces/incident-trace.temp";
#endif
using protozero::proto_utils::MakeTagLengthDelimited;
using protozero::proto_utils::WriteVarInt;
int PerfettoCmd::PrintUsage(const char* argv0) {
PERFETTO_ELOG(R"(
Usage: %s
--background -d : Exits immediately and continues tracing in background
--config -c : /path/to/trace/config/file or - for stdin
--out -o : /path/to/out/trace/file or - for stdout
--dropbox TAG : Upload trace into DropBox using tag TAG
--no-guardrails : Ignore guardrails triggered when using --dropbox (for testing).
--txt : Parse config as pbtxt. Not a stable API. Not for production use.
--reset-guardrails : Resets the state of the guardails and exits (for testing).
--help -h
light configuration flags: (only when NOT using -c/--config)
--time -t : Trace duration N[s,m,h] (default: 10s)
--buffer -b : Ring buffer size N[mb,gb] (default: 32mb)
--size -s : Max file size N[mb,gb] (default: in-memory ring-buffer only)
ATRACE_CAT : Record ATRACE_CAT (e.g. wm)
FTRACE_GROUP/FTRACE_NAME : Record ftrace event (e.g. sched/sched_switch)
FTRACE_GROUP/* : Record all events in group (e.g. sched/*)
statsd-specific flags:
--alert-id : ID of the alert that triggered this trace.
--config-id : ID of the triggering config.
--config-uid : UID of app which registered the config.
--subscription-id : ID of the subscription that triggered this trace.
Detach mode. DISCOURAGED, read https://docs.perfetto.dev/#/detached-mode :
--detach=key : Detach from the tracing session with the given key.
--attach=key [--stop] : Re-attach to the session (optionally stop tracing once reattached).
--is_detached=key : Check if the session can be re-attached (0:Yes, 2:No, 1:Error).
)",
argv0);
return 1;
}
int PerfettoCmd::Main(int argc, char** argv) {
enum LongOption {
OPT_ALERT_ID = 1000,
OPT_CONFIG_ID,
OPT_CONFIG_UID,
OPT_SUBSCRIPTION_ID,
OPT_RESET_GUARDRAILS,
OPT_PBTXT_CONFIG,
OPT_DROPBOX,
OPT_ATRACE_APP,
OPT_IGNORE_GUARDRAILS,
OPT_DETACH,
OPT_ATTACH,
OPT_IS_DETACHED,
OPT_STOP,
};
static const struct option long_options[] = {
{"help", no_argument, nullptr, 'h'},
{"config", required_argument, nullptr, 'c'},
{"out", required_argument, nullptr, 'o'},
{"background", no_argument, nullptr, 'd'},
{"time", required_argument, nullptr, 't'},
{"buffer", required_argument, nullptr, 'b'},
{"size", required_argument, nullptr, 's'},
{"no-guardrails", no_argument, nullptr, OPT_IGNORE_GUARDRAILS},
{"txt", no_argument, nullptr, OPT_PBTXT_CONFIG},
{"dropbox", required_argument, nullptr, OPT_DROPBOX},
{"alert-id", required_argument, nullptr, OPT_ALERT_ID},
{"config-id", required_argument, nullptr, OPT_CONFIG_ID},
{"config-uid", required_argument, nullptr, OPT_CONFIG_UID},
{"subscription-id", required_argument, nullptr, OPT_SUBSCRIPTION_ID},
{"reset-guardrails", no_argument, nullptr, OPT_RESET_GUARDRAILS},
{"detach", required_argument, nullptr, OPT_DETACH},
{"attach", required_argument, nullptr, OPT_ATTACH},
{"is_detached", required_argument, nullptr, OPT_IS_DETACHED},
{"stop", no_argument, nullptr, OPT_STOP},
{"app", required_argument, nullptr, OPT_ATRACE_APP},
{nullptr, 0, nullptr, 0}};
int option_index = 0;
std::string config_file_name;
std::string trace_config_raw;
bool background = false;
bool ignore_guardrails = false;
bool parse_as_pbtxt = false;
perfetto::protos::TraceConfig::StatsdMetadata statsd_metadata;
RateLimiter limiter;
ConfigOptions config_options;
bool has_config_options = false;
for (;;) {
int option =
getopt_long(argc, argv, "hc:o:dt:b:s:", long_options, &option_index);
if (option == -1)
break; // EOF.
if (option == 'c') {
config_file_name = std::string(optarg);
if (strcmp(optarg, "-") == 0) {
std::istreambuf_iterator<char> begin(std::cin), end;
trace_config_raw.assign(begin, end);
} else if (strcmp(optarg, ":test") == 0) {
// TODO(primiano): temporary for testing only.
perfetto::protos::TraceConfig test_config;
test_config.add_buffers()->set_size_kb(4096);
test_config.set_duration_ms(2000);
auto* ds_config = test_config.add_data_sources()->mutable_config();
ds_config->set_name("linux.ftrace");
ds_config->mutable_ftrace_config()->add_ftrace_events("sched_switch");
ds_config->mutable_ftrace_config()->add_ftrace_events("cpu_idle");
ds_config->mutable_ftrace_config()->add_ftrace_events("cpu_frequency");
ds_config->mutable_ftrace_config()->add_ftrace_events("gpu_frequency");
ds_config->set_target_buffer(0);
test_config.SerializeToString(&trace_config_raw);
} else {
if (!base::ReadFile(optarg, &trace_config_raw)) {
PERFETTO_PLOG("Could not open %s", optarg);
return 1;
}
}
continue;
}
if (option == 'o') {
trace_out_path_ = optarg;
continue;
}
if (option == 'd') {
background = true;
continue;
}
if (option == 't') {
has_config_options = true;
config_options.time = std::string(optarg);
continue;
}
if (option == 'b') {
has_config_options = true;
config_options.buffer_size = std::string(optarg);
continue;
}
if (option == 's') {
has_config_options = true;
config_options.max_file_size = std::string(optarg);
continue;
}
if (option == OPT_DROPBOX) {
#if PERFETTO_BUILDFLAG(PERFETTO_ANDROID_BUILD)
if (!optarg)
PERFETTO_FATAL("optarg is null");
dropbox_tag_ = optarg;
continue;
#else
PERFETTO_ELOG("DropBox is only supported with Android tree builds");
return 1;
#endif
}
if (option == OPT_PBTXT_CONFIG) {
parse_as_pbtxt = true;
continue;
}
if (option == OPT_IGNORE_GUARDRAILS) {
ignore_guardrails = true;
continue;
}
if (option == OPT_RESET_GUARDRAILS) {
PERFETTO_CHECK(limiter.ClearState());
PERFETTO_ILOG("Guardrail state cleared");
return 0;
}
if (option == OPT_ALERT_ID) {
statsd_metadata.set_triggering_alert_id(atoll(optarg));
continue;
}
if (option == OPT_CONFIG_ID) {
statsd_metadata.set_triggering_config_id(atoll(optarg));
continue;
}
if (option == OPT_CONFIG_UID) {
statsd_metadata.set_triggering_config_uid(atoi(optarg));
continue;
}
if (option == OPT_SUBSCRIPTION_ID) {
statsd_metadata.set_triggering_subscription_id(atoll(optarg));
continue;
}
if (option == OPT_ATRACE_APP) {
config_options.atrace_apps.push_back(std::string(optarg));
has_config_options = true;
continue;
}
if (option == OPT_DETACH) {
detach_key_ = std::string(optarg);
PERFETTO_CHECK(!detach_key_.empty());
continue;
}
if (option == OPT_ATTACH) {
attach_key_ = std::string(optarg);
PERFETTO_CHECK(!attach_key_.empty());
continue;
}
if (option == OPT_IS_DETACHED) {
attach_key_ = std::string(optarg);
redetach_once_attached_ = true;
PERFETTO_CHECK(!attach_key_.empty());
continue;
}
if (option == OPT_STOP) {
stop_trace_once_attached_ = true;
continue;
}
return PrintUsage(argv[0]);
}
for (ssize_t i = optind; i < argc; i++) {
has_config_options = true;
config_options.categories.push_back(argv[i]);
}
if (is_detach() && is_attach()) {
PERFETTO_ELOG("--attach and --detach are mutually exclusive");
return 1;
}
if (is_detach() && background) {
PERFETTO_ELOG("--detach and --background are mutually exclusive");
return 1;
}
if (stop_trace_once_attached_ && !is_attach()) {
PERFETTO_ELOG("--stop is supported only in combination with --attach");
return 1;
}
// Parse the trace config. It can be either:
// 1) A proto-encoded file/stdin (-c ...).
// 2) A proto-text file/stdin (-c ... --txt).
// 3) A set of option arguments (-t 10s -s 10m).
// The only cases in which a trace config is not expected is --attach.
// For this we are just acting on already existing sessions.
perfetto::protos::TraceConfig trace_config_proto;
std::vector<std::string> triggers_to_activate;
bool parsed = false;
if (is_attach()) {
if ((!trace_config_raw.empty() || has_config_options)) {
PERFETTO_ELOG("Cannot specify a trace config with --attach");
return 1;
}
} else if (has_config_options) {
if (!trace_config_raw.empty()) {
PERFETTO_ELOG(
"Cannot specify both -c/--config and any of --time, --size, "
"--buffer, --app, ATRACE_CAT, FTRACE_EVENT");
return 1;
}
parsed = CreateConfigFromOptions(config_options, &trace_config_proto);
} else {
if (trace_config_raw.empty()) {
PERFETTO_ELOG("The TraceConfig is empty");
return 1;
}
PERFETTO_DLOG("Parsing TraceConfig, %zu bytes", trace_config_raw.size());
if (parse_as_pbtxt) {
parsed = ParseTraceConfigPbtxt(config_file_name, trace_config_raw,
&trace_config_proto);
} else {
parsed = trace_config_proto.ParseFromString(trace_config_raw);
}
}
trace_config_.reset(new TraceConfig());
if (parsed) {
*trace_config_proto.mutable_statsd_metadata() = std::move(statsd_metadata);
trace_config_->FromProto(trace_config_proto);
trace_config_raw.clear();
} else if (!is_attach()) {
PERFETTO_ELOG("The trace config is invalid, bailing out.");
return 1;
}
if (!trace_config_->incident_report_config().destination_package().empty()) {
if (dropbox_tag_.empty()) {
PERFETTO_ELOG("Unexpected IncidentReportConfig without --dropbox.");
return 1;
}
}
// Set up the output file. Either --out or --dropbox are expected, with the
// only exception of --attach. In this case the output file is passed when
// detaching.
if (!trace_out_path_.empty() && !dropbox_tag_.empty()) {
PERFETTO_ELOG(
"Can't log to a file (--out) and DropBox (--dropbox) at the same "
"time");
return 1;
}
// |activate_triggers| in the trace config is shorthand for trigger_perfetto.
// In this case we don't intend to send any trace config to the service,
// rather use that as a signal to the cmdline client to connect as a producer
// and activate triggers.
if (!trace_config_->activate_triggers().empty()) {
for (const auto& trigger : trace_config_->activate_triggers()) {
triggers_to_activate.push_back(trigger);
}
trace_config_.reset(new TraceConfig());
}
bool open_out_file = true;
if (is_attach()) {
open_out_file = false;
if (!trace_out_path_.empty() || !dropbox_tag_.empty()) {
PERFETTO_ELOG("Can't pass an --out file (or --dropbox) to --attach");
return 1;
}
} else if (!triggers_to_activate.empty()) {
open_out_file = false;
} else if (trace_out_path_.empty() && dropbox_tag_.empty()) {
PERFETTO_ELOG("Either --out or --dropbox is required");
return 1;
} else if (is_detach() && !trace_config_->write_into_file()) {
// In detached mode we must pass the file descriptor to the service and
// let that one write the trace. We cannot use the IPC readback code path
// because the client process is about to exit soon after detaching.
PERFETTO_ELOG(
"TraceConfig's write_into_file must be true when using --detach");
return 1;
}
if (open_out_file) {
if (!OpenOutputFile())
return 1;
if (!trace_config_->write_into_file())
packet_writer_ = CreateFilePacketWriter(trace_out_stream_.get());
}
if (background) {
pid_t pid;
switch (pid = fork()) {
case -1:
PERFETTO_FATAL("fork");
case 0: {
PERFETTO_CHECK(setsid() != -1);
base::ignore_result(chdir("/"));
base::ScopedFile null = base::OpenFile("/dev/null", O_RDONLY);
PERFETTO_CHECK(null);
PERFETTO_CHECK(dup2(*null, STDIN_FILENO) != -1);
PERFETTO_CHECK(dup2(*null, STDOUT_FILENO) != -1);
PERFETTO_CHECK(dup2(*null, STDERR_FILENO) != -1);
// Do not accidentally close stdin/stdout/stderr.
if (*null <= 2)
null.release();
break;
}
default:
printf("%d\n", pid);
exit(0);
}
}
// If we are just activating triggers then we don't need to rate limit,
// connect as a consumer or run the trace. So bail out after processing all
// the options.
if (!triggers_to_activate.empty()) {
bool finished_with_success = false;
TriggerProducer producer(&task_runner_,
[this, &finished_with_success](bool success) {
finished_with_success = success;
task_runner_.Quit();
},
&triggers_to_activate);
task_runner_.Run();
return finished_with_success ? 0 : 1;
}
if (trace_config_->compression_type() ==
perfetto::TraceConfig::COMPRESSION_TYPE_DEFLATE) {
if (packet_writer_) {
packet_writer_ = CreateZipPacketWriter(std::move(packet_writer_));
} else {
PERFETTO_ELOG("Cannot compress when tracing directly to file.");
}
}
RateLimiter::Args args{};
args.is_dropbox = !dropbox_tag_.empty();
args.current_time = base::GetWallTimeS();
args.ignore_guardrails = ignore_guardrails;
args.allow_user_build_tracing = trace_config_->allow_user_build_tracing();
#if PERFETTO_BUILDFLAG(PERFETTO_ANDROID_USERDEBUG_BUILD) || \
PERFETTO_BUILDFLAG(PERFETTO_STANDALONE_BUILD)
args.max_upload_bytes_override =
trace_config_->guardrail_overrides().max_upload_per_day_bytes();
#endif
if (args.is_dropbox && !args.ignore_guardrails &&
(trace_config_->duration_ms() == 0 &&
trace_config_->trigger_config().trigger_timeout_ms() == 0)) {
PERFETTO_ELOG("Can't trace indefinitely when tracing to Dropbox.");
return 1;
}
if (!limiter.ShouldTrace(args))
return 1;
consumer_endpoint_ =
ConsumerIPCClient::Connect(GetConsumerSocket(), this, &task_runner_);
SetupCtrlCSignalHandler();
task_runner_.Run();
return limiter.OnTraceDone(args, did_process_full_trace_, bytes_written_) ? 0
: 1;
}
void PerfettoCmd::OnConnect() {
if (is_attach()) {
consumer_endpoint_->Attach(attach_key_);
return;
}
PERFETTO_LOG(
"Connected to the Perfetto traced service, starting tracing for %d ms",
trace_config_->duration_ms());
PERFETTO_DCHECK(trace_config_);
trace_config_->set_enable_extra_guardrails(!dropbox_tag_.empty());
base::ScopedFile optional_fd;
if (trace_config_->write_into_file())
optional_fd.reset(dup(fileno(*trace_out_stream_)));
consumer_endpoint_->EnableTracing(*trace_config_, std::move(optional_fd));
if (is_detach()) {
consumer_endpoint_->Detach(detach_key_); // Will invoke OnDetach() soon.
return;
}
// Failsafe mechanism to avoid waiting indefinitely if the service hangs.
if (trace_config_->duration_ms()) {
uint32_t trace_timeout = trace_config_->duration_ms() + 10000 +
trace_config_->flush_timeout_ms();
task_runner_.PostDelayedTask(std::bind(&PerfettoCmd::OnTimeout, this),
trace_timeout);
}
}
void PerfettoCmd::OnDisconnect() {
PERFETTO_LOG("Disconnected from the Perfetto traced service");
task_runner_.Quit();
}
void PerfettoCmd::OnTimeout() {
PERFETTO_ELOG("Timed out while waiting for trace from the service, aborting");
task_runner_.Quit();
}
void PerfettoCmd::OnTraceData(std::vector<TracePacket> packets, bool has_more) {
if (!packet_writer_->WritePackets(packets)) {
PERFETTO_ELOG("Failed to write packets");
FinalizeTraceAndExit();
}
if (!has_more)
FinalizeTraceAndExit(); // Reached end of trace.
}
void PerfettoCmd::OnTracingDisabled() {
if (trace_config_->write_into_file()) {
// If write_into_file == true, at this point the passed file contains
// already all the packets.
return FinalizeTraceAndExit();
}
// This will cause a bunch of OnTraceData callbacks. The last one will
// save the file and exit.
consumer_endpoint_->ReadBuffers();
}
void PerfettoCmd::FinalizeTraceAndExit() {
packet_writer_.reset();
if (trace_out_stream_) {
fseek(*trace_out_stream_, 0, SEEK_END);
off_t sz = ftell(*trace_out_stream_);
if (sz > 0)
bytes_written_ = static_cast<size_t>(sz);
}
if (dropbox_tag_.empty()) {
trace_out_stream_.reset();
did_process_full_trace_ = true;
if (trace_config_->write_into_file()) {
// trace_out_path_ might be empty in the case of --attach.
PERFETTO_LOG("Trace written into the output file");
} else {
PERFETTO_LOG("Wrote %" PRIu64 " bytes into %s", bytes_written_,
trace_out_path_ == "-" ? "stdout" : trace_out_path_.c_str());
}
task_runner_.Quit();
return;
}
// Otherwise, write to Dropbox unless there's a special override in the
// incident report config.
if (!trace_config_->incident_report_config().skip_dropbox()) {
SaveOutputToDropboxOrCrash();
}
// Optionally save the trace as an incident. This is either in addition to, or
// instead of, the Dropbox write.
if (!trace_config_->incident_report_config().destination_package().empty()) {
SaveOutputToIncidentTraceOrCrash();
// Ask incidentd to create a report, which will read the file we just wrote.
PERFETTO_CHECK(
StartIncidentReport(trace_config_->incident_report_config()));
}
did_process_full_trace_ = true;
task_runner_.Quit();
}
void PerfettoCmd::SaveOutputToDropboxOrCrash() {
#if PERFETTO_BUILDFLAG(PERFETTO_ANDROID_BUILD)
if (bytes_written_ == 0) {
PERFETTO_LOG("Skipping write to dropbox. Empty trace.");
return;
}
android::sp<android::os::DropBoxManager> dropbox =
new android::os::DropBoxManager();
PERFETTO_CHECK(fseek(*trace_out_stream_, 0, SEEK_SET) == 0);
// DropBox takes ownership of the file descriptor, so give it a duplicate.
// Also we need to give it a read-only copy of the fd or will hit a SELinux
// violation (about system_server ending up with a writable FD to our dir).
char fdpath[64];
sprintf(fdpath, "/proc/self/fd/%d", fileno(*trace_out_stream_));
base::ScopedFile read_only_fd(base::OpenFile(fdpath, O_RDONLY));
PERFETTO_CHECK(read_only_fd);
android::binder::Status status =
dropbox->addFile(android::String16(dropbox_tag_.c_str()),
read_only_fd.release(), 0 /* flags */);
if (status.isOk()) {
PERFETTO_LOG("Wrote %" PRIu64
" bytes (before compression) into DropBox with tag %s",
bytes_written_, dropbox_tag_.c_str());
} else {
PERFETTO_FATAL("DropBox upload failed: %s", status.toString8().c_str());
}
#endif
}
// Open a staging file (unlinking the previous instance), copy the trace
// contents over, then rename to a final hardcoded path. Such tracing sessions
// should not normally overlap. We do not use unique unique filenames to avoid
// creating an unbounded amount of files in case of errors.
void PerfettoCmd::SaveOutputToIncidentTraceOrCrash() {
#if PERFETTO_BUILDFLAG(PERFETTO_ANDROID_BUILD)
if (bytes_written_ == 0) {
PERFETTO_LOG("Skipping incident report. Empty trace.");
return;
}
PERFETTO_CHECK(unlink(kTempIncidentTraceLocation) == 0 || errno == ENOENT);
// SELinux constrains the set of readers.
base::ScopedFile staging_fd =
base::OpenFile(kTempIncidentTraceLocation, O_CREAT | O_RDWR, 0666);
PERFETTO_CHECK(staging_fd);
// Set the desired permissions even if under a umask.
PERFETTO_CHECK(fchmod(*staging_fd, 0666) == 0);
off_t offset = 0;
PERFETTO_CHECK(sendfile(*staging_fd, fileno(*trace_out_stream_), &offset,
bytes_written_) == bytes_written_);
staging_fd.reset();
PERFETTO_CHECK(rename(kTempIncidentTraceLocation, kIncidentTraceLocation) ==
0);
// Note: not calling fsync(2), as we're not interested in the file being
// consistent in case of a crash.
#endif
}
bool PerfettoCmd::OpenOutputFile() {
base::ScopedFile fd;
if (!dropbox_tag_.empty()) {
#if PERFETTO_BUILDFLAG(PERFETTO_ANDROID_BUILD)
// If we are tracing to DropBox, there's no need to make a
// filesystem-visible temporary file.
// TODO(skyostil): Fall back to base::TempFile for older devices.
fd = base::OpenFile(kTempDropBoxTraceDir, O_TMPFILE | O_RDWR, 0600);
if (!fd) {
PERFETTO_PLOG("Could not create a temporary trace file in %s",
kTempDropBoxTraceDir);
return false;
}
#else
PERFETTO_FATAL("Tracing to Dropbox requires the Android build.");
#endif
} else if (trace_out_path_ == "-") {
fd.reset(dup(STDOUT_FILENO));
} else {
fd = base::OpenFile(trace_out_path_, O_RDWR | O_CREAT | O_TRUNC, 0600);
}
if (!fd) {
PERFETTO_PLOG(
"Failed to open %s. If you get permission denied in "
"/data/misc/perfetto-traces, the file might have been "
"created by another user, try deleting it first.",
trace_out_path_.c_str());
return false;
}
trace_out_stream_.reset(fdopen(fd.release(), "wb"));
PERFETTO_CHECK(trace_out_stream_);
return true;
}
void PerfettoCmd::SetupCtrlCSignalHandler() {
// Setup signal handler.
struct sigaction sa {};
// Glibc headers for sa_sigaction trigger this.
#pragma GCC diagnostic push
#if defined(__clang__)
#pragma GCC diagnostic ignored "-Wdisabled-macro-expansion"
#endif
sa.sa_handler = [](int) { g_consumer_cmd->SignalCtrlC(); };
sa.sa_flags = static_cast<decltype(sa.sa_flags)>(SA_RESETHAND | SA_RESTART);
#pragma GCC diagnostic pop
sigaction(SIGINT, &sa, nullptr);
sigaction(SIGTERM, &sa, nullptr);
task_runner_.AddFileDescriptorWatch(ctrl_c_evt_.fd(), [this] {
PERFETTO_LOG("SIGINT/SIGTERM received: disabling tracing.");
ctrl_c_evt_.Clear();
consumer_endpoint_->Flush(0, [this](bool flush_success) {
if (!flush_success)
PERFETTO_ELOG("Final flush unsuccessful.");
consumer_endpoint_->DisableTracing();
});
});
}
void PerfettoCmd::OnDetach(bool success) {
if (!success) {
PERFETTO_ELOG("Session detach failed");
exit(1);
}
exit(0);
}
void PerfettoCmd::OnAttach(bool success, const TraceConfig& trace_config) {
if (!success) {
if (!redetach_once_attached_) {
// Print an error message if attach fails, with the exception of the
// --is_detached case, where we want to silently return.
PERFETTO_ELOG("Session re-attach failed. Check service logs for details");
}
// Keep this exit code distinguishable from the general error code so
// --is_detached can tell the difference between a general error and the
// not-detached case.
exit(2);
}
if (redetach_once_attached_) {
consumer_endpoint_->Detach(attach_key_); // Will invoke OnDetach() soon.
return;
}
trace_config_.reset(new TraceConfig(trace_config));
PERFETTO_DCHECK(trace_config_->write_into_file());
if (stop_trace_once_attached_) {
consumer_endpoint_->Flush(0, [this](bool flush_success) {
if (!flush_success)
PERFETTO_ELOG("Final flush unsuccessful.");
consumer_endpoint_->DisableTracing();
});
}
}
void PerfettoCmd::OnTraceStats(bool /*success*/,
const TraceStats& /*trace_config*/) {
// TODO(eseckler): Support GetTraceStats().
}
void PerfettoCmd::OnObservableEvents(
const ObservableEvents& /*observable_events*/) {}
int __attribute__((visibility("default")))
PerfettoCmdMain(int argc, char** argv) {
g_consumer_cmd = new perfetto::PerfettoCmd();
return g_consumer_cmd->Main(argc, argv);
}
} // namespace perfetto