1 /*
2 * Copyright 2017, 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 <debuggerd/client.h>
18
19 #include <fcntl.h>
20 #include <stdio.h>
21 #include <unistd.h>
22
23 #include <chrono>
24 #include <thread>
25 #include <vector>
26
27 #include <gtest/gtest.h>
28
29 #include <android-base/file.h>
30 #include <android-base/properties.h>
31 #include <android-base/stringprintf.h>
32 #include <android-base/strings.h>
33 #include <android-base/unique_fd.h>
34
35 #include "util.h"
36
37 using namespace std::chrono_literals;
38 using android::base::unique_fd;
39
getThreadCount()40 static int getThreadCount() {
41 int threadCount = 1024;
42 std::vector<std::string> characteristics =
43 android::base::Split(android::base::GetProperty("ro.build.characteristics", ""), ",");
44 if (std::find(characteristics.begin(), characteristics.end(), "embedded")
45 != characteristics.end()) {
46 // 128 is the realistic number for iot devices.
47 threadCount = 128;
48 }
49 return threadCount;
50 }
51
TEST(debuggerd_client,race)52 TEST(debuggerd_client, race) {
53 static int THREAD_COUNT = getThreadCount();
54 pid_t forkpid = fork();
55
56 ASSERT_NE(-1, forkpid);
57
58 if (forkpid == 0) {
59 // Spawn a bunch of threads, to make crash_dump take longer.
60 std::vector<std::thread> threads;
61 for (int i = 0; i < THREAD_COUNT; ++i) {
62 threads.emplace_back([]() {
63 while (true) {
64 std::this_thread::sleep_for(60s);
65 }
66 });
67 }
68
69 std::this_thread::sleep_for(60s);
70 exit(0);
71 }
72
73 unique_fd pipe_read, pipe_write;
74 ASSERT_TRUE(Pipe(&pipe_read, &pipe_write));
75
76 // 16 MiB should be enough for everyone.
77 constexpr int PIPE_SIZE = 16 * 1024 * 1024;
78 ASSERT_EQ(PIPE_SIZE, fcntl(pipe_read.get(), F_SETPIPE_SZ, PIPE_SIZE));
79
80 // Wait for a bit to let the child spawn all of its threads.
81 std::this_thread::sleep_for(1s);
82
83 ASSERT_TRUE(
84 debuggerd_trigger_dump(forkpid, kDebuggerdNativeBacktrace, 60000, std::move(pipe_write)));
85 // Immediately kill the forked child, to make sure that the dump didn't return early.
86 ASSERT_EQ(0, kill(forkpid, SIGKILL)) << strerror(errno);
87
88 // Check the output.
89 std::string result;
90 ASSERT_TRUE(android::base::ReadFdToString(pipe_read.get(), &result));
91
92 // Look for "----- end <PID> -----"
93 int found_end = 0;
94
95 std::string expected_end = android::base::StringPrintf("----- end %d -----", forkpid);
96
97 std::vector<std::string> lines = android::base::Split(result, "\n");
98 for (const std::string& line : lines) {
99 if (line == expected_end) {
100 ++found_end;
101 }
102 }
103
104 EXPECT_EQ(1, found_end) << "\nOutput: \n" << result;
105 }
106
TEST(debuggerd_client,no_timeout)107 TEST(debuggerd_client, no_timeout) {
108 unique_fd pipe_read, pipe_write;
109 ASSERT_TRUE(Pipe(&pipe_read, &pipe_write));
110
111 pid_t forkpid = fork();
112 ASSERT_NE(-1, forkpid);
113 if (forkpid == 0) {
114 pipe_write.reset();
115 char dummy;
116 TEMP_FAILURE_RETRY(read(pipe_read.get(), &dummy, sizeof(dummy)));
117 exit(0);
118 }
119
120 pipe_read.reset();
121
122 unique_fd output_read, output_write;
123 ASSERT_TRUE(Pipe(&output_read, &output_write));
124 ASSERT_TRUE(
125 debuggerd_trigger_dump(forkpid, kDebuggerdNativeBacktrace, 0, std::move(output_write)));
126 }
127