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 <android-base/file.h>
29 #include <android-base/logging.h>
30 #include <android-base/parseint.h>
31 #include <android-base/strings.h>
32 #include <android-base/stringprintf.h>
39 LineReader(FILE* fp) : fp_(fp), buf_(nullptr), bufsize_(0) {
48 if (getline(&buf_, &bufsize_, fp_) != -1) {
54 size_t MaxLineSize() {
64 std::vector<int> GetOnlineCpus() {
65 std::vector<int> result;
66 FILE* fp = fopen("/sys/devices/system/cpu/online", "re");
68 PLOG(ERROR) << "can't open online cpu information";
72 LineReader reader(fp);
74 if ((line = reader.ReadLine()) != nullptr) {
75 result = GetCpusFromString(line);
77 CHECK(!result.empty()) << "can't get online cpu information";
81 std::vector<int> GetCpusFromString(const std::string& s) {
82 std::set<int> cpu_set;
83 bool have_dash = false;
84 const char* p = s.c_str();
88 // Parse line like: 0,1-3, 5, 7-8
89 while ((cpu = strtol(p, &endp, 10)) != 0 || endp != p) {
90 if (have_dash && !cpu_set.empty()) {
91 for (int t = last_cpu + 1; t < cpu; ++t) {
99 while (!isdigit(*p) && *p != '\0') {
106 return std::vector<int>(cpu_set.begin(), cpu_set.end());
109 bool ProcessKernelSymbols(const std::string& symbol_file,
110 std::function<bool(const KernelSymbol&)> callback) {
111 FILE* fp = fopen(symbol_file.c_str(), "re");
113 PLOG(ERROR) << "failed to open file " << symbol_file;
116 LineReader reader(fp);
118 while ((line = reader.ReadLine()) != nullptr) {
119 // Parse line like: ffffffffa005c4e4 d __warned.41698 [libsas]
120 char name[reader.MaxLineSize()];
121 char module[reader.MaxLineSize()];
125 if (sscanf(line, "%" PRIx64 " %c %s%s", &symbol.addr, &symbol.type, name, module) < 3) {
129 size_t module_len = strlen(module);
130 if (module_len > 2 && module[0] == '[' && module[module_len - 1] == ']') {
131 module[module_len - 1] = '\0';
132 symbol.module = &module[1];
134 symbol.module = nullptr;
137 if (callback(symbol)) {
144 static bool FindStartOfKernelSymbolCallback(const KernelSymbol& symbol, uint64_t* start_addr) {
145 if (symbol.module == nullptr) {
146 *start_addr = symbol.addr;
152 static bool FindStartOfKernelSymbol(const std::string& symbol_file, uint64_t* start_addr) {
153 return ProcessKernelSymbols(
154 symbol_file, std::bind(&FindStartOfKernelSymbolCallback, std::placeholders::_1, start_addr));
157 static bool FindKernelFunctionSymbolCallback(const KernelSymbol& symbol, const std::string& name,
159 if ((symbol.type == 'T' || symbol.type == 'W' || symbol.type == 'A') &&
160 symbol.module == nullptr && name == symbol.name) {
167 static bool FindKernelFunctionSymbol(const std::string& symbol_file, const std::string& name,
169 return ProcessKernelSymbols(
170 symbol_file, std::bind(&FindKernelFunctionSymbolCallback, std::placeholders::_1, name, addr));
173 std::vector<ModuleMmap> GetLoadedModules() {
174 std::vector<ModuleMmap> result;
175 FILE* fp = fopen("/proc/modules", "re");
177 // There is no /proc/modules on Android devices, so we don't print error if failed to open it.
178 PLOG(DEBUG) << "failed to open file /proc/modules";
181 LineReader reader(fp);
183 while ((line = reader.ReadLine()) != nullptr) {
184 // Parse line like: nf_defrag_ipv6 34768 1 nf_conntrack_ipv6, Live 0xffffffffa0fe5000
185 char name[reader.MaxLineSize()];
187 if (sscanf(line, "%s%*lu%*u%*s%*s 0x%" PRIx64, name, &addr) == 2) {
190 map.start_addr = addr;
191 result.push_back(map);
197 static std::string GetLinuxVersion() {
199 if (android::base::ReadFileToString("/proc/version", &content)) {
200 char s[content.size() + 1];
201 if (sscanf(content.c_str(), "Linux version %s", s) == 1) {
205 PLOG(FATAL) << "can't read linux version";
209 static void GetAllModuleFiles(const std::string& path,
210 std::unordered_map<std::string, std::string>* module_file_map) {
211 std::vector<std::string> files;
212 std::vector<std::string> subdirs;
213 GetEntriesInDir(path, &files, &subdirs);
214 for (auto& name : files) {
215 if (android::base::EndsWith(name, ".ko")) {
216 std::string module_name = name.substr(0, name.size() - 3);
217 std::replace(module_name.begin(), module_name.end(), '-', '_');
218 module_file_map->insert(std::make_pair(module_name, path + "/" + name));
221 for (auto& name : subdirs) {
222 GetAllModuleFiles(path + "/" + name, module_file_map);
226 static std::vector<ModuleMmap> GetModulesInUse() {
227 // TODO: There is no /proc/modules or /lib/modules on Android, find methods work on it.
228 std::vector<ModuleMmap> module_mmaps = GetLoadedModules();
229 std::string linux_version = GetLinuxVersion();
230 std::string module_dirpath = "/lib/modules/" + linux_version + "/kernel";
231 std::unordered_map<std::string, std::string> module_file_map;
232 GetAllModuleFiles(module_dirpath, &module_file_map);
233 for (auto& module : module_mmaps) {
234 auto it = module_file_map.find(module.name);
235 if (it != module_file_map.end()) {
236 module.filepath = it->second;
242 bool GetKernelAndModuleMmaps(KernelMmap* kernel_mmap, std::vector<ModuleMmap>* module_mmaps) {
243 if (!FindStartOfKernelSymbol("/proc/kallsyms", &kernel_mmap->start_addr)) {
244 LOG(DEBUG) << "call FindStartOfKernelSymbol() failed";
247 if (!FindKernelFunctionSymbol("/proc/kallsyms", "_text", &kernel_mmap->pgoff)) {
248 LOG(DEBUG) << "call FindKernelFunctionSymbol() failed";
251 kernel_mmap->name = DEFAULT_KERNEL_MMAP_NAME;
252 *module_mmaps = GetModulesInUse();
253 if (module_mmaps->size() == 0) {
254 kernel_mmap->len = std::numeric_limits<unsigned long long>::max() - kernel_mmap->start_addr;
257 module_mmaps->begin(), module_mmaps->end(),
258 [](const ModuleMmap& m1, const ModuleMmap& m2) { return m1.start_addr < m2.start_addr; });
259 CHECK_LE(kernel_mmap->start_addr, (*module_mmaps)[0].start_addr);
260 // When not having enough privilege, all addresses are read as 0.
261 if (kernel_mmap->start_addr == (*module_mmaps)[0].start_addr) {
262 kernel_mmap->len = 0;
264 kernel_mmap->len = (*module_mmaps)[0].start_addr - kernel_mmap->start_addr - 1;
266 for (size_t i = 0; i + 1 < module_mmaps->size(); ++i) {
267 if ((*module_mmaps)[i].start_addr == (*module_mmaps)[i + 1].start_addr) {
268 (*module_mmaps)[i].len = 0;
270 (*module_mmaps)[i].len =
271 (*module_mmaps)[i + 1].start_addr - (*module_mmaps)[i].start_addr - 1;
274 module_mmaps->back().len =
275 std::numeric_limits<unsigned long long>::max() - module_mmaps->back().start_addr;
280 static bool ReadThreadNameAndTgid(const std::string& status_file, std::string* comm, pid_t* tgid) {
281 FILE* fp = fopen(status_file.c_str(), "re");
285 bool read_comm = false;
286 bool read_tgid = false;
287 LineReader reader(fp);
289 while ((line = reader.ReadLine()) != nullptr) {
290 char s[reader.MaxLineSize()];
291 if (sscanf(line, "Name:%s", s) == 1) {
294 } else if (sscanf(line, "Tgid:%d", tgid) == 1) {
297 if (read_comm && read_tgid) {
304 static std::vector<pid_t> GetThreadsInProcess(pid_t pid) {
305 std::vector<pid_t> result;
306 std::string task_dirname = android::base::StringPrintf("/proc/%d/task", pid);
307 std::vector<std::string> subdirs;
308 GetEntriesInDir(task_dirname, nullptr, &subdirs);
309 for (const auto& name : subdirs) {
311 if (!android::base::ParseInt(name.c_str(), &tid, 0)) {
314 result.push_back(tid);
319 static bool GetThreadComm(pid_t pid, std::vector<ThreadComm>* thread_comms) {
320 std::vector<pid_t> tids = GetThreadsInProcess(pid);
321 for (auto& tid : tids) {
322 std::string status_file = android::base::StringPrintf("/proc/%d/task/%d/status", pid, tid);
325 // It is possible that the process or thread exited before we can read its status.
326 if (!ReadThreadNameAndTgid(status_file, &comm, &tgid)) {
334 thread_comms->push_back(thread);
339 bool GetThreadComms(std::vector<ThreadComm>* thread_comms) {
340 thread_comms->clear();
341 std::vector<std::string> subdirs;
342 GetEntriesInDir("/proc", nullptr, &subdirs);
343 for (auto& name : subdirs) {
345 if (!android::base::ParseInt(name.c_str(), &pid, 0)) {
348 if (!GetThreadComm(pid, thread_comms)) {
355 bool GetThreadMmapsInProcess(pid_t pid, std::vector<ThreadMmap>* thread_mmaps) {
356 std::string map_file = android::base::StringPrintf("/proc/%d/maps", pid);
357 FILE* fp = fopen(map_file.c_str(), "re");
359 PLOG(DEBUG) << "can't open file " << map_file;
362 thread_mmaps->clear();
363 LineReader reader(fp);
365 while ((line = reader.ReadLine()) != nullptr) {
366 // Parse line like: 00400000-00409000 r-xp 00000000 fc:00 426998 /usr/lib/gvfs/gvfsd-http
367 uint64_t start_addr, end_addr, pgoff;
368 char type[reader.MaxLineSize()];
369 char execname[reader.MaxLineSize()];
370 strcpy(execname, "");
371 if (sscanf(line, "%" PRIx64 "-%" PRIx64 " %s %" PRIx64 " %*x:%*x %*u %s\n", &start_addr,
372 &end_addr, type, &pgoff, execname) < 4) {
375 if (strcmp(execname, "") == 0) {
376 strcpy(execname, DEFAULT_EXECNAME_FOR_THREAD_MMAP);
379 thread.start_addr = start_addr;
380 thread.len = end_addr - start_addr;
381 thread.pgoff = pgoff;
382 thread.name = execname;
383 thread.executable = (type[2] == 'x');
384 thread_mmaps->push_back(thread);
389 bool GetKernelBuildId(BuildId* build_id) {
390 return GetBuildIdFromNoteFile("/sys/kernel/notes", build_id);
393 bool GetModuleBuildId(const std::string& module_name, BuildId* build_id) {
394 std::string notefile = "/sys/module/" + module_name + "/notes/.note.gnu.build-id";
395 return GetBuildIdFromNoteFile(notefile, build_id);
398 bool GetValidThreadsFromProcessString(const std::string& pid_str, std::set<pid_t>* tid_set) {
399 std::vector<std::string> strs = android::base::Split(pid_str, ",");
400 for (const auto& s : strs) {
402 if (!android::base::ParseInt(s.c_str(), &pid, 0)) {
403 LOG(ERROR) << "Invalid pid '" << s << "'";
406 std::vector<pid_t> tids = GetThreadsInProcess(pid);
408 LOG(ERROR) << "Non existing process '" << pid << "'";
411 tid_set->insert(tids.begin(), tids.end());
416 bool GetValidThreadsFromThreadString(const std::string& tid_str, std::set<pid_t>* tid_set) {
417 std::vector<std::string> strs = android::base::Split(tid_str, ",");
418 for (const auto& s : strs) {
420 if (!android::base::ParseInt(s.c_str(), &tid, 0)) {
421 LOG(ERROR) << "Invalid tid '" << s << "'";
424 if (!IsDir(android::base::StringPrintf("/proc/%d", tid))) {
425 LOG(ERROR) << "Non existing thread '" << tid << "'";
428 tid_set->insert(tid);
433 bool GetExecPath(std::string* exec_path) {
435 ssize_t path_len = readlink("/proc/self/exe", path, sizeof(path));
436 if (path_len <= 0 || path_len >= static_cast<ssize_t>(sizeof(path))) {
437 PLOG(ERROR) << "readlink failed";
440 path[path_len] = '\0';