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 // Process name is capped at 15 bytes.
63 ASSERT_EQ("libprocinfo_tes", self.name);
64 ASSERT_EQ(gettid(), self.tid);
65 ASSERT_EQ(getpid(), self.pid);
66 ASSERT_EQ(getppid(), self.ppid);
67 ASSERT_EQ(getuid(), self.uid);
68 ASSERT_EQ(getgid(), self.gid);
69 close(fd);
70 }
71
TEST(process_info,process_tids_smoke)72 TEST(process_info, process_tids_smoke) {
73 pid_t main_tid = gettid();
74 std::thread([main_tid]() {
75 pid_t thread_tid = gettid();
76
77 {
78 std::vector<pid_t> vec;
79 ASSERT_TRUE(android::procinfo::GetProcessTids(getpid(), &vec));
80 ASSERT_EQ(1, std::count(vec.begin(), vec.end(), main_tid));
81 ASSERT_EQ(1, std::count(vec.begin(), vec.end(), thread_tid));
82 }
83
84 {
85 std::set<pid_t> set;
86 ASSERT_TRUE(android::procinfo::GetProcessTids(getpid(), &set));
87 ASSERT_EQ(1, std::count(set.begin(), set.end(), main_tid));
88 ASSERT_EQ(1, std::count(set.begin(), set.end(), thread_tid));
89 }
90 }).join();
91 }
92
TEST(process_info,process_state)93 TEST(process_info, process_state) {
94 int pipefd[2];
95 ASSERT_EQ(0, pipe2(pipefd, O_CLOEXEC));
96 pid_t forkpid = fork();
97
98 ASSERT_NE(-1, forkpid);
99 if (forkpid == 0) {
100 close(pipefd[1]);
101 char buf;
102 TEMP_FAILURE_RETRY(read(pipefd[0], &buf, 1));
103 _exit(0);
104 }
105
106
107 // Give the child some time to get to the read.
108 android::procinfo::ProcessInfo procinfo;
109 for (int loop = 0; loop < 50 && procinfo.state != android::procinfo::kProcessStateSleeping; loop++) {
110 std::this_thread::sleep_for(100ms);
111 ASSERT_TRUE(android::procinfo::GetProcessInfo(forkpid, &procinfo));
112 }
113 ASSERT_EQ(android::procinfo::kProcessStateSleeping, procinfo.state);
114
115 ASSERT_EQ(0, kill(forkpid, SIGKILL));
116
117 // Give the kernel some time to kill the child.
118 for (int loop = 0; loop < 50 && procinfo.state != android::procinfo::kProcessStateZombie; loop++) {
119 std::this_thread::sleep_for(100ms);
120 ASSERT_TRUE(android::procinfo::GetProcessInfo(forkpid, &procinfo));
121 }
122 ASSERT_EQ(android::procinfo::kProcessStateZombie, procinfo.state);
123
124 ASSERT_EQ(forkpid, waitpid(forkpid, nullptr, 0));
125 }
126
read_uptime_secs()127 static uint64_t read_uptime_secs() {
128 std::string uptime;
129 if (!android::base::ReadFileToString("/proc/uptime", &uptime)) {
130 PLOG(FATAL) << "failed to read /proc/uptime";
131 }
132 return strtoll(uptime.c_str(), nullptr, 10);
133 }
134
TEST(process_info,process_start_time)135 TEST(process_info, process_start_time) {
136 uint64_t start = read_uptime_secs();
137 int pipefd[2];
138 ASSERT_EQ(0, pipe2(pipefd, O_CLOEXEC));
139
140 std::this_thread::sleep_for(1000ms);
141
142 pid_t forkpid = fork();
143
144 ASSERT_NE(-1, forkpid);
145 if (forkpid == 0) {
146 close(pipefd[1]);
147 char buf;
148 TEMP_FAILURE_RETRY(read(pipefd[0], &buf, 1));
149 _exit(0);
150 }
151
152 std::this_thread::sleep_for(1000ms);
153
154 uint64_t end = read_uptime_secs();
155
156 android::procinfo::ProcessInfo procinfo;
157 ASSERT_TRUE(android::procinfo::GetProcessInfo(forkpid, &procinfo));
158
159 // starttime is measured in clock ticks: uptime is in seconds:
160 uint64_t process_start = procinfo.starttime / sysconf(_SC_CLK_TCK);
161 ASSERT_LE(start, process_start);
162 ASSERT_LE(process_start, end);
163
164 ASSERT_EQ(0, kill(forkpid, SIGKILL));
165 ASSERT_EQ(forkpid, waitpid(forkpid, nullptr, 0));
166 }
167
TEST(process_info,GetProcessInfoFromProcPidFd_set_error)168 TEST(process_info, GetProcessInfoFromProcPidFd_set_error) {
169 TemporaryDir tmp_dir;
170
171 android::base::unique_fd dirfd(open(tmp_dir.path, O_DIRECTORY | O_RDONLY));
172 android::procinfo::ProcessInfo procinfo;
173 std::string error;
174
175 // failed to open status file error
176 // No segfault if not given error string.
177 ASSERT_FALSE(android::procinfo::GetProcessInfoFromProcPidFd(dirfd.get(), 0, &procinfo));
178 // Set error when given error string.
179 ASSERT_FALSE(android::procinfo::GetProcessInfoFromProcPidFd(dirfd.get(), 0, &procinfo, &error));
180 ASSERT_EQ(error, "failed to open /proc/0/status in GetProcessInfoFromProcPidFd: No such file or directory");
181
182 // failed to parse status file error
183 std::string status_file = std::string(tmp_dir.path) + "/status";
184 ASSERT_TRUE(android::base::WriteStringToFile("invalid data", status_file));
185 ASSERT_FALSE(android::procinfo::GetProcessInfoFromProcPidFd(dirfd.get(), 0, &procinfo));
186 ASSERT_FALSE(android::procinfo::GetProcessInfoFromProcPidFd(dirfd.get(), 0, &procinfo, &error));
187 ASSERT_EQ(error, "failed to parse /proc/0/status");
188
189 // Give the "/status" file valid contents.
190 ASSERT_TRUE(android::base::WriteStringToFile(
191 "Name:\tsh\nTgid:\t0\nPid:\t0\nTracerPid:\t0\nUid:\t0\nGid:\t0\n", status_file));
192
193 // failed to open stat file error
194 ASSERT_FALSE(android::procinfo::GetProcessInfoFromProcPidFd(dirfd.get(), 0, &procinfo));
195 ASSERT_FALSE(android::procinfo::GetProcessInfoFromProcPidFd(dirfd.get(), 0, &procinfo, &error));
196 ASSERT_EQ(error, "failed to open /proc/0/stat: No such file or directory");
197
198 // failed to parse stat file error
199 std::string stat_file = std::string(tmp_dir.path) + "/stat";
200 ASSERT_TRUE(android::base::WriteStringToFile("2027 (sh) invalid data", stat_file));
201 ASSERT_FALSE(android::procinfo::GetProcessInfoFromProcPidFd(dirfd.get(), 0, &procinfo));
202 ASSERT_FALSE(android::procinfo::GetProcessInfoFromProcPidFd(dirfd.get(), 0, &procinfo, &error));
203 ASSERT_EQ(error, "failed to parse /proc/0/stat");
204 }
205