1 /*
2 * Copyright (C) 2016 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 <procinfo/process.h>
18
19 #include <fcntl.h>
20 #include <stdlib.h>
21 #include <sys/types.h>
22 #include <unistd.h>
23
24 #include <algorithm>
25 #include <chrono>
26 #include <set>
27 #include <thread>
28 #include <vector>
29
30 #include <gtest/gtest.h>
31
32 #include <android-base/file.h>
33 #include <android-base/logging.h>
34 #include <android-base/stringprintf.h>
35 #include <android-base/unique_fd.h>
36
37 using namespace std::chrono_literals;
38
39 #if defined(__GLIBC__)
40 #include <syscall.h>
gettid()41 static pid_t gettid() {
42 return syscall(__NR_gettid);
43 }
44 #endif
45
TEST(process_info,process_info_smoke)46 TEST(process_info, process_info_smoke) {
47 android::procinfo::ProcessInfo self;
48 ASSERT_TRUE(android::procinfo::GetProcessInfo(gettid(), &self));
49 ASSERT_EQ(gettid(), self.tid);
50 ASSERT_EQ(getpid(), self.pid);
51 ASSERT_EQ(getppid(), self.ppid);
52 ASSERT_EQ(getuid(), self.uid);
53 ASSERT_EQ(getgid(), self.gid);
54 }
55
TEST(process_info,process_info_proc_pid_fd_smoke)56 TEST(process_info, process_info_proc_pid_fd_smoke) {
57 android::procinfo::ProcessInfo self;
58 int fd = open(android::base::StringPrintf("/proc/%d", gettid()).c_str(), O_DIRECTORY | O_RDONLY);
59 ASSERT_NE(-1, fd);
60 ASSERT_TRUE(android::procinfo::GetProcessInfoFromProcPidFd(fd, gettid(), &self));
61
62 std::string process_path = android::base::GetExecutablePath();
63 std::string process_name = android::base::Basename(process_path);
64 // Process name is capped at 15 bytes.
65 ASSERT_EQ(process_name.substr(0, 15), self.name);
66 ASSERT_EQ(gettid(), self.tid);
67 ASSERT_EQ(getpid(), self.pid);
68 ASSERT_EQ(getppid(), self.ppid);
69 ASSERT_EQ(getuid(), self.uid);
70 ASSERT_EQ(getgid(), self.gid);
71 close(fd);
72 }
73
TEST(process_info,process_tids_smoke)74 TEST(process_info, process_tids_smoke) {
75 pid_t main_tid = gettid();
76 std::thread([main_tid]() {
77 pid_t thread_tid = gettid();
78
79 {
80 std::vector<pid_t> vec;
81 ASSERT_TRUE(android::procinfo::GetProcessTids(getpid(), &vec));
82 ASSERT_EQ(1, std::count(vec.begin(), vec.end(), main_tid));
83 ASSERT_EQ(1, std::count(vec.begin(), vec.end(), thread_tid));
84 }
85
86 {
87 std::set<pid_t> set;
88 ASSERT_TRUE(android::procinfo::GetProcessTids(getpid(), &set));
89 ASSERT_EQ(1, std::count(set.begin(), set.end(), main_tid));
90 ASSERT_EQ(1, std::count(set.begin(), set.end(), thread_tid));
91 }
92 }).join();
93 }
94
TEST(process_info,process_state)95 TEST(process_info, process_state) {
96 int pipefd[2];
97 ASSERT_EQ(0, pipe2(pipefd, O_CLOEXEC));
98 pid_t forkpid = fork();
99
100 ASSERT_NE(-1, forkpid);
101 if (forkpid == 0) {
102 close(pipefd[1]);
103 char buf;
104 TEMP_FAILURE_RETRY(read(pipefd[0], &buf, 1));
105 _exit(0);
106 }
107
108
109 // Give the child some time to get to the read.
110 android::procinfo::ProcessInfo procinfo;
111 for (int loop = 0; loop < 50 && procinfo.state != android::procinfo::kProcessStateSleeping; loop++) {
112 std::this_thread::sleep_for(100ms);
113 ASSERT_TRUE(android::procinfo::GetProcessInfo(forkpid, &procinfo));
114 }
115 ASSERT_EQ(android::procinfo::kProcessStateSleeping, procinfo.state);
116
117 ASSERT_EQ(0, kill(forkpid, SIGKILL));
118
119 // Give the kernel some time to kill the child.
120 for (int loop = 0; loop < 50 && procinfo.state != android::procinfo::kProcessStateZombie; loop++) {
121 std::this_thread::sleep_for(100ms);
122 ASSERT_TRUE(android::procinfo::GetProcessInfo(forkpid, &procinfo));
123 }
124 ASSERT_EQ(android::procinfo::kProcessStateZombie, procinfo.state);
125
126 ASSERT_EQ(forkpid, waitpid(forkpid, nullptr, 0));
127 }
128
read_uptime_secs()129 static uint64_t read_uptime_secs() {
130 std::string uptime;
131 if (!android::base::ReadFileToString("/proc/uptime", &uptime)) {
132 PLOG(FATAL) << "failed to read /proc/uptime";
133 }
134 return strtoll(uptime.c_str(), nullptr, 10);
135 }
136
TEST(process_info,process_start_time)137 TEST(process_info, process_start_time) {
138 uint64_t start = read_uptime_secs();
139 int pipefd[2];
140 ASSERT_EQ(0, pipe2(pipefd, O_CLOEXEC));
141
142 std::this_thread::sleep_for(1000ms);
143
144 pid_t forkpid = fork();
145
146 ASSERT_NE(-1, forkpid);
147 if (forkpid == 0) {
148 close(pipefd[1]);
149 char buf;
150 TEMP_FAILURE_RETRY(read(pipefd[0], &buf, 1));
151 _exit(0);
152 }
153
154 std::this_thread::sleep_for(1000ms);
155
156 uint64_t end = read_uptime_secs();
157
158 android::procinfo::ProcessInfo procinfo;
159 ASSERT_TRUE(android::procinfo::GetProcessInfo(forkpid, &procinfo));
160
161 // starttime is measured in clock ticks: uptime is in seconds:
162 uint64_t process_start = procinfo.starttime / sysconf(_SC_CLK_TCK);
163 ASSERT_LE(start, process_start);
164 ASSERT_LE(process_start, end);
165
166 ASSERT_EQ(0, kill(forkpid, SIGKILL));
167 ASSERT_EQ(forkpid, waitpid(forkpid, nullptr, 0));
168 }
169
TEST(process_info,GetProcessInfoFromProcPidFd_set_error)170 TEST(process_info, GetProcessInfoFromProcPidFd_set_error) {
171 TemporaryDir tmp_dir;
172
173 android::base::unique_fd dirfd(open(tmp_dir.path, O_DIRECTORY | O_RDONLY));
174 android::procinfo::ProcessInfo procinfo;
175 std::string error;
176
177 // failed to open status file error
178 // No segfault if not given error string.
179 ASSERT_FALSE(android::procinfo::GetProcessInfoFromProcPidFd(dirfd.get(), 0, &procinfo));
180 // Set error when given error string.
181 ASSERT_FALSE(android::procinfo::GetProcessInfoFromProcPidFd(dirfd.get(), 0, &procinfo, &error));
182 ASSERT_EQ(error, "failed to open /proc/0/status in GetProcessInfoFromProcPidFd: No such file or directory");
183
184 // failed to parse status file error
185 std::string status_file = std::string(tmp_dir.path) + "/status";
186 ASSERT_TRUE(android::base::WriteStringToFile("invalid data", status_file));
187 ASSERT_FALSE(android::procinfo::GetProcessInfoFromProcPidFd(dirfd.get(), 0, &procinfo));
188 ASSERT_FALSE(android::procinfo::GetProcessInfoFromProcPidFd(dirfd.get(), 0, &procinfo, &error));
189 ASSERT_EQ(error, "failed to parse /proc/0/status");
190
191 // Give the "/status" file valid contents.
192 ASSERT_TRUE(android::base::WriteStringToFile(
193 "Name:\tsh\nTgid:\t0\nPid:\t0\nTracerPid:\t0\nUid:\t0\nGid:\t0\n", status_file));
194
195 // failed to open stat file error
196 ASSERT_FALSE(android::procinfo::GetProcessInfoFromProcPidFd(dirfd.get(), 0, &procinfo));
197 ASSERT_FALSE(android::procinfo::GetProcessInfoFromProcPidFd(dirfd.get(), 0, &procinfo, &error));
198 ASSERT_EQ(error, "failed to open /proc/0/stat: No such file or directory");
199
200 // failed to parse stat file error
201 std::string stat_file = std::string(tmp_dir.path) + "/stat";
202 ASSERT_TRUE(android::base::WriteStringToFile("2027 (sh) invalid data", stat_file));
203 ASSERT_FALSE(android::procinfo::GetProcessInfoFromProcPidFd(dirfd.get(), 0, &procinfo));
204 ASSERT_FALSE(android::procinfo::GetProcessInfoFromProcPidFd(dirfd.get(), 0, &procinfo, &error));
205 ASSERT_EQ(error, "failed to parse /proc/0/stat");
206 }
207