1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
|
/*
* 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.
*/
#define STATSD_DEBUG false // STOPSHIP if true
#include "config/ConfigKey.h"
#include "Log.h"
#include "src/statsd_config.pb.h" // Alert
#include <android-base/unique_fd.h>
#include <inttypes.h>
#include <sys/wait.h>
#include <string>
namespace {
const char kDropboxTag[] = "perfetto";
}
namespace android {
namespace os {
namespace statsd {
bool CollectPerfettoTraceAndUploadToDropbox(const PerfettoDetails& config,
int64_t subscription_id,
int64_t alert_id,
const ConfigKey& configKey) {
VLOG("Starting trace collection through perfetto");
if (!config.has_trace_config()) {
ALOGE("The perfetto trace config is empty, aborting");
return false;
}
char subscriptionId[25];
char alertId[25];
char configId[25];
char configUid[25];
snprintf(subscriptionId, sizeof(subscriptionId), "%" PRId64, subscription_id);
snprintf(alertId, sizeof(alertId), "%" PRId64, alert_id);
snprintf(configId, sizeof(configId), "%" PRId64, configKey.GetId());
snprintf(configUid, sizeof(configUid), "%d", configKey.GetUid());
android::base::unique_fd readPipe;
android::base::unique_fd writePipe;
if (!android::base::Pipe(&readPipe, &writePipe)) {
ALOGE("pipe() failed while calling the Perfetto client: %s", strerror(errno));
return false;
}
pid_t pid = fork();
if (pid < 0) {
ALOGE("fork() failed while calling the Perfetto client: %s", strerror(errno));
return false;
}
if (pid == 0) {
// Child process.
// No malloc calls or library calls after this point. Remember that even
// ALOGx (aka android_printLog()) can use dynamic memory for vsprintf().
writePipe.reset(); // Close the write end (owned by the main process).
// Replace stdin with |readPipe| so the main process can write into it.
if (dup2(readPipe.get(), STDIN_FILENO) < 0) _exit(1);
readPipe.reset();
// Replace stdout/stderr with /dev/null and close any other file
// descriptor. This is to avoid SELinux complaining about perfetto
// trying to access files accidentally left open by statsd (i.e. files
// that have been opened without the O_CLOEXEC flag).
int devNullFd = open("/dev/null", O_RDWR | O_CLOEXEC);
if (dup2(devNullFd, STDOUT_FILENO) < 0) _exit(2);
if (dup2(devNullFd, STDERR_FILENO) < 0) _exit(3);
close(devNullFd);
for (int i = 0; i < 1024; i++) {
if (i != STDIN_FILENO && i != STDOUT_FILENO && i != STDERR_FILENO) close(i);
}
execl("/system/bin/perfetto", "perfetto", "--background", "--config", "-", "--dropbox",
kDropboxTag, "--alert-id", alertId, "--config-id", configId, "--config-uid",
configUid, "--subscription-id", subscriptionId, nullptr);
// execl() doesn't return in case of success, if we get here something
// failed.
_exit(4);
}
// Main process.
readPipe.reset(); // Close the read end (owned by the child process).
// Using fdopen() because fwrite() has the right logic to chunking write()
// over a pipe (see __sfvwrite()).
FILE* writePipeStream = android::base::Fdopen(std::move(writePipe), "wb");
if (!writePipeStream) {
ALOGE("fdopen() failed while calling the Perfetto client: %s", strerror(errno));
return false;
}
const std::string& cfgProto = config.trace_config();
size_t bytesWritten = fwrite(cfgProto.data(), 1, cfgProto.size(), writePipeStream);
fclose(writePipeStream);
if (bytesWritten != cfgProto.size() || cfgProto.size() == 0) {
ALOGE("fwrite() failed (ret: %zd) while calling the Perfetto client: %s", bytesWritten,
strerror(errno));
return false;
}
// This does NOT wait for the full duration of the trace. It just waits until
// the process has read the config from stdin and detached.
int childStatus = 0;
waitpid(pid, &childStatus, 0);
if (!WIFEXITED(childStatus) || WEXITSTATUS(childStatus) != 0) {
ALOGE("Child process failed (0x%x) while calling the Perfetto client", childStatus);
return false;
}
VLOG("CollectPerfettoTraceAndUploadToDropbox() succeeded");
return true;
}
} // namespace statsd
} // namespace os
} // namespace android
|
