2 * Copyright (C) 2015 The Android Open Source Project
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
17 #include "environment.h"
25 #include <unordered_map>
28 #include <base/file.h>
29 #include <base/logging.h>
30 #include <base/strings.h>
31 #include <base/stringprintf.h>
36 std::vector<int> GetOnlineCpus() {
37 std::vector<int> result;
38 FILE* fp = fopen("/sys/devices/system/cpu/online", "re");
40 PLOG(ERROR) << "can't open online cpu information";
44 LineReader reader(fp);
46 if ((line = reader.ReadLine()) != nullptr) {
47 result = GetCpusFromString(line);
49 CHECK(!result.empty()) << "can't get online cpu information";
53 std::vector<int> GetCpusFromString(const std::string& s) {
54 std::set<int> cpu_set;
55 bool have_dash = false;
56 const char* p = s.c_str();
60 // Parse line like: 0,1-3, 5, 7-8
61 while ((cpu = strtol(p, &endp, 10)) != 0 || endp != p) {
62 if (have_dash && !cpu_set.empty()) {
63 for (int t = last_cpu + 1; t < cpu; ++t) {
71 while (!isdigit(*p) && *p != '\0') {
78 return std::vector<int>(cpu_set.begin(), cpu_set.end());
81 bool ProcessKernelSymbols(const std::string& symbol_file,
82 std::function<bool(const KernelSymbol&)> callback) {
83 FILE* fp = fopen(symbol_file.c_str(), "re");
85 PLOG(ERROR) << "failed to open file " << symbol_file;
88 LineReader reader(fp);
90 while ((line = reader.ReadLine()) != nullptr) {
91 // Parse line like: ffffffffa005c4e4 d __warned.41698 [libsas]
92 char name[reader.MaxLineSize()];
93 char module[reader.MaxLineSize()];
97 if (sscanf(line, "%" PRIx64 " %c %s%s", &symbol.addr, &symbol.type, name, module) < 3) {
101 size_t module_len = strlen(module);
102 if (module_len > 2 && module[0] == '[' && module[module_len - 1] == ']') {
103 module[module_len - 1] = '\0';
104 symbol.module = &module[1];
106 symbol.module = nullptr;
109 if (callback(symbol)) {
116 static bool FindStartOfKernelSymbolCallback(const KernelSymbol& symbol, uint64_t* start_addr) {
117 if (symbol.module == nullptr) {
118 *start_addr = symbol.addr;
124 static bool FindStartOfKernelSymbol(const std::string& symbol_file, uint64_t* start_addr) {
125 return ProcessKernelSymbols(
126 symbol_file, std::bind(&FindStartOfKernelSymbolCallback, std::placeholders::_1, start_addr));
129 static bool FindKernelFunctionSymbolCallback(const KernelSymbol& symbol, const std::string& name,
131 if ((symbol.type == 'T' || symbol.type == 'W' || symbol.type == 'A') &&
132 symbol.module == nullptr && name == symbol.name) {
139 static bool FindKernelFunctionSymbol(const std::string& symbol_file, const std::string& name,
141 return ProcessKernelSymbols(
142 symbol_file, std::bind(&FindKernelFunctionSymbolCallback, std::placeholders::_1, name, addr));
145 std::vector<ModuleMmap> GetLoadedModules() {
146 std::vector<ModuleMmap> result;
147 FILE* fp = fopen("/proc/modules", "re");
149 // There is no /proc/modules on Android devices, so we don't print error if failed to open it.
150 PLOG(DEBUG) << "failed to open file /proc/modules";
153 LineReader reader(fp);
155 while ((line = reader.ReadLine()) != nullptr) {
156 // Parse line like: nf_defrag_ipv6 34768 1 nf_conntrack_ipv6, Live 0xffffffffa0fe5000
157 char name[reader.MaxLineSize()];
159 if (sscanf(line, "%s%*lu%*u%*s%*s 0x%" PRIx64, name, &addr) == 2) {
162 map.start_addr = addr;
163 result.push_back(map);
169 static std::string GetLinuxVersion() {
171 if (android::base::ReadFileToString("/proc/version", &content)) {
172 char s[content.size() + 1];
173 if (sscanf(content.c_str(), "Linux version %s", s) == 1) {
177 PLOG(FATAL) << "can't read linux version";
181 static void GetAllModuleFiles(const std::string& path,
182 std::unordered_map<std::string, std::string>* module_file_map) {
183 std::vector<std::string> files;
184 std::vector<std::string> subdirs;
185 GetEntriesInDir(path, &files, &subdirs);
186 for (auto& name : files) {
187 if (android::base::EndsWith(name, ".ko")) {
188 std::string module_name = name.substr(0, name.size() - 3);
189 std::replace(module_name.begin(), module_name.end(), '-', '_');
190 module_file_map->insert(std::make_pair(module_name, path + "/" + name));
193 for (auto& name : subdirs) {
194 GetAllModuleFiles(path + "/" + name, module_file_map);
198 static std::vector<ModuleMmap> GetModulesInUse() {
199 // TODO: There is no /proc/modules or /lib/modules on Android, find methods work on it.
200 std::vector<ModuleMmap> module_mmaps = GetLoadedModules();
201 std::string linux_version = GetLinuxVersion();
202 std::string module_dirpath = "/lib/modules/" + linux_version + "/kernel";
203 std::unordered_map<std::string, std::string> module_file_map;
204 GetAllModuleFiles(module_dirpath, &module_file_map);
205 for (auto& module : module_mmaps) {
206 auto it = module_file_map.find(module.name);
207 if (it != module_file_map.end()) {
208 module.filepath = it->second;
214 bool GetKernelAndModuleMmaps(KernelMmap* kernel_mmap, std::vector<ModuleMmap>* module_mmaps) {
215 if (!FindStartOfKernelSymbol("/proc/kallsyms", &kernel_mmap->start_addr)) {
216 LOG(DEBUG) << "call FindStartOfKernelSymbol() failed";
219 if (!FindKernelFunctionSymbol("/proc/kallsyms", "_text", &kernel_mmap->pgoff)) {
220 LOG(DEBUG) << "call FindKernelFunctionSymbol() failed";
223 kernel_mmap->name = DEFAULT_KERNEL_MMAP_NAME;
224 *module_mmaps = GetModulesInUse();
225 if (module_mmaps->size() == 0) {
226 kernel_mmap->len = std::numeric_limits<unsigned long long>::max() - kernel_mmap->start_addr;
229 module_mmaps->begin(), module_mmaps->end(),
230 [](const ModuleMmap& m1, const ModuleMmap& m2) { return m1.start_addr < m2.start_addr; });
231 CHECK_LE(kernel_mmap->start_addr, (*module_mmaps)[0].start_addr);
232 // When not having enough privilege, all addresses are read as 0.
233 if (kernel_mmap->start_addr == (*module_mmaps)[0].start_addr) {
234 kernel_mmap->len = 0;
236 kernel_mmap->len = (*module_mmaps)[0].start_addr - kernel_mmap->start_addr - 1;
238 for (size_t i = 0; i + 1 < module_mmaps->size(); ++i) {
239 if ((*module_mmaps)[i].start_addr == (*module_mmaps)[i + 1].start_addr) {
240 (*module_mmaps)[i].len = 0;
242 (*module_mmaps)[i].len =
243 (*module_mmaps)[i + 1].start_addr - (*module_mmaps)[i].start_addr - 1;
246 module_mmaps->back().len =
247 std::numeric_limits<unsigned long long>::max() - module_mmaps->back().start_addr;
252 static bool ReadThreadNameAndTgid(const std::string& status_file, std::string* comm, pid_t* tgid) {
253 FILE* fp = fopen(status_file.c_str(), "re");
257 bool read_comm = false;
258 bool read_tgid = false;
259 LineReader reader(fp);
261 while ((line = reader.ReadLine()) != nullptr) {
262 char s[reader.MaxLineSize()];
263 if (sscanf(line, "Name:%s", s) == 1) {
266 } else if (sscanf(line, "Tgid:%d", tgid) == 1) {
269 if (read_comm && read_tgid) {
276 static std::vector<pid_t> GetThreadsInProcess(pid_t pid) {
277 std::vector<pid_t> result;
278 std::string task_dirname = android::base::StringPrintf("/proc/%d/task", pid);
279 std::vector<std::string> subdirs;
280 GetEntriesInDir(task_dirname, nullptr, &subdirs);
281 for (auto& name : subdirs) {
283 if (!StringToPid(name, &tid)) {
286 result.push_back(tid);
291 static bool GetThreadComm(pid_t pid, std::vector<ThreadComm>* thread_comms) {
292 std::vector<pid_t> tids = GetThreadsInProcess(pid);
293 for (auto& tid : tids) {
294 std::string status_file = android::base::StringPrintf("/proc/%d/task/%d/status", pid, tid);
297 // It is possible that the process or thread exited before we can read its status.
298 if (!ReadThreadNameAndTgid(status_file, &comm, &tgid)) {
306 thread_comms->push_back(thread);
311 bool GetThreadComms(std::vector<ThreadComm>* thread_comms) {
312 thread_comms->clear();
313 std::vector<std::string> subdirs;
314 GetEntriesInDir("/proc", nullptr, &subdirs);
315 for (auto& name : subdirs) {
317 if (!StringToPid(name, &pid)) {
320 if (!GetThreadComm(pid, thread_comms)) {
327 bool GetThreadMmapsInProcess(pid_t pid, std::vector<ThreadMmap>* thread_mmaps) {
328 std::string map_file = android::base::StringPrintf("/proc/%d/maps", pid);
329 FILE* fp = fopen(map_file.c_str(), "re");
331 PLOG(DEBUG) << "can't open file " << map_file;
334 thread_mmaps->clear();
335 LineReader reader(fp);
337 while ((line = reader.ReadLine()) != nullptr) {
338 // Parse line like: 00400000-00409000 r-xp 00000000 fc:00 426998 /usr/lib/gvfs/gvfsd-http
339 uint64_t start_addr, end_addr, pgoff;
340 char type[reader.MaxLineSize()];
341 char execname[reader.MaxLineSize()];
342 strcpy(execname, "");
343 if (sscanf(line, "%" PRIx64 "-%" PRIx64 " %s %" PRIx64 " %*x:%*x %*u %s\n", &start_addr,
344 &end_addr, type, &pgoff, execname) < 4) {
347 if (strcmp(execname, "") == 0) {
348 strcpy(execname, DEFAULT_EXECNAME_FOR_THREAD_MMAP);
351 thread.start_addr = start_addr;
352 thread.len = end_addr - start_addr;
353 thread.pgoff = pgoff;
354 thread.name = execname;
355 thread.executable = (type[2] == 'x');
356 thread_mmaps->push_back(thread);
361 bool GetKernelBuildId(BuildId* build_id) {
362 return GetBuildIdFromNoteFile("/sys/kernel/notes", build_id);
365 bool GetModuleBuildId(const std::string& module_name, BuildId* build_id) {
366 std::string notefile = "/sys/module/" + module_name + "/notes/.note.gnu.build-id";
367 return GetBuildIdFromNoteFile(notefile, build_id);
370 bool GetValidThreadsFromProcessString(const std::string& pid_str, std::set<pid_t>* tid_set) {
371 std::vector<std::string> strs = android::base::Split(pid_str, ",");
372 for (auto& s : strs) {
374 if (!StringToPid(s, &pid)) {
375 LOG(ERROR) << "Invalid pid '" << s << "'";
378 std::vector<pid_t> tids = GetThreadsInProcess(pid);
380 LOG(ERROR) << "Non existing process '" << pid << "'";
383 tid_set->insert(tids.begin(), tids.end());
388 bool GetValidThreadsFromThreadString(const std::string& tid_str, std::set<pid_t>* tid_set) {
389 std::vector<std::string> strs = android::base::Split(tid_str, ",");
390 for (auto& s : strs) {
392 if (!StringToPid(s, &tid)) {
393 LOG(ERROR) << "Invalid tid '" << s << "'";
396 if (!IsDir(android::base::StringPrintf("/proc/%d", tid))) {
397 LOG(ERROR) << "Non existing thread '" << tid << "'";
400 tid_set->insert(tid);
405 bool GetExecPath(std::string* exec_path) {
407 ssize_t path_len = readlink("/proc/self/exe", path, sizeof(path));
408 if (path_len <= 0 || path_len >= static_cast<ssize_t>(sizeof(path))) {
409 PLOG(ERROR) << "readlink failed";
412 path[path_len] = '\0';