henrike@webrtc.org | 47be73b | 2014-05-13 18:00:26 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2008 The WebRTC Project Authors. All rights reserved. |
| 3 | * |
| 4 | * Use of this source code is governed by a BSD-style license |
| 5 | * that can be found in the LICENSE file in the root of the source |
| 6 | * tree. An additional intellectual property rights grant can be found |
| 7 | * in the file PATENTS. All contributing project authors may |
| 8 | * be found in the AUTHORS file in the root of the source tree. |
| 9 | */ |
| 10 | |
| 11 | #if defined(WEBRTC_LINUX) |
| 12 | #include "webrtc/base/linux.h" |
| 13 | |
| 14 | #include <ctype.h> |
| 15 | |
| 16 | #include <errno.h> |
| 17 | #include <sys/utsname.h> |
| 18 | #include <sys/wait.h> |
| 19 | |
| 20 | #include <cstdio> |
| 21 | #include <set> |
| 22 | |
| 23 | #include "webrtc/base/stringencode.h" |
| 24 | |
| 25 | namespace rtc { |
| 26 | |
| 27 | static const char kCpuInfoFile[] = "/proc/cpuinfo"; |
| 28 | static const char kCpuMaxFreqFile[] = |
| 29 | "/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq"; |
| 30 | |
| 31 | ProcCpuInfo::ProcCpuInfo() { |
| 32 | } |
| 33 | |
| 34 | ProcCpuInfo::~ProcCpuInfo() { |
| 35 | } |
| 36 | |
| 37 | bool ProcCpuInfo::LoadFromSystem() { |
| 38 | ConfigParser procfs; |
| 39 | if (!procfs.Open(kCpuInfoFile)) { |
| 40 | return false; |
| 41 | } |
| 42 | return procfs.Parse(§ions_); |
| 43 | }; |
| 44 | |
| 45 | bool ProcCpuInfo::GetSectionCount(size_t* count) { |
| 46 | if (sections_.empty()) { |
| 47 | return false; |
| 48 | } |
| 49 | if (count) { |
| 50 | *count = sections_.size(); |
| 51 | } |
| 52 | return true; |
| 53 | } |
| 54 | |
| 55 | bool ProcCpuInfo::GetNumCpus(int* num) { |
| 56 | if (sections_.empty()) { |
| 57 | return false; |
| 58 | } |
| 59 | int total_cpus = 0; |
| 60 | #if defined(__arm__) |
| 61 | // Count the number of blocks that have a "processor" key defined. On ARM, |
| 62 | // there may be extra blocks of information that aren't per-processor. |
| 63 | size_t section_count = sections_.size(); |
| 64 | for (size_t i = 0; i < section_count; ++i) { |
| 65 | int processor_id; |
| 66 | if (GetSectionIntValue(i, "processor", &processor_id)) { |
| 67 | ++total_cpus; |
| 68 | } |
| 69 | } |
| 70 | // Single core ARM systems don't include "processor" keys at all, so return |
| 71 | // that we have a single core if we didn't find any explicitly above. |
| 72 | if (total_cpus == 0) { |
| 73 | total_cpus = 1; |
| 74 | } |
| 75 | #else |
| 76 | // On X86, there is exactly one info section per processor. |
| 77 | total_cpus = static_cast<int>(sections_.size()); |
| 78 | #endif |
| 79 | if (num) { |
| 80 | *num = total_cpus; |
| 81 | } |
| 82 | return true; |
| 83 | } |
| 84 | |
| 85 | bool ProcCpuInfo::GetNumPhysicalCpus(int* num) { |
| 86 | if (sections_.empty()) { |
| 87 | return false; |
| 88 | } |
| 89 | // TODO: /proc/cpuinfo only reports cores that are currently |
| 90 | // _online_, so this may underreport the number of physical cores. |
| 91 | #if defined(__arm__) |
| 92 | // ARM (currently) has no hyperthreading, so just return the same value |
| 93 | // as GetNumCpus. |
| 94 | return GetNumCpus(num); |
| 95 | #else |
| 96 | int total_cores = 0; |
| 97 | std::set<int> physical_ids; |
| 98 | size_t section_count = sections_.size(); |
| 99 | for (size_t i = 0; i < section_count; ++i) { |
| 100 | int physical_id; |
| 101 | int cores; |
| 102 | // Count the cores for the physical id only if we have not counted the id. |
| 103 | if (GetSectionIntValue(i, "physical id", &physical_id) && |
| 104 | GetSectionIntValue(i, "cpu cores", &cores) && |
| 105 | physical_ids.find(physical_id) == physical_ids.end()) { |
| 106 | physical_ids.insert(physical_id); |
| 107 | total_cores += cores; |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | if (num) { |
| 112 | *num = total_cores; |
| 113 | } |
| 114 | return true; |
| 115 | #endif |
| 116 | } |
| 117 | |
| 118 | bool ProcCpuInfo::GetCpuFamily(int* id) { |
| 119 | int cpu_family = 0; |
| 120 | |
| 121 | #if defined(__arm__) |
| 122 | // On some ARM platforms, there is no 'cpu family' in '/proc/cpuinfo'. But |
| 123 | // there is 'CPU Architecture' which can be used as 'cpu family'. |
| 124 | // See http://en.wikipedia.org/wiki/ARM_architecture for a good list of |
| 125 | // ARM cpu families, architectures, and their mappings. |
| 126 | // There may be multiple sessions that aren't per-processor. We need to scan |
| 127 | // through each session until we find the first 'CPU architecture'. |
| 128 | size_t section_count = sections_.size(); |
| 129 | for (size_t i = 0; i < section_count; ++i) { |
| 130 | if (GetSectionIntValue(i, "CPU architecture", &cpu_family)) { |
| 131 | // We returns the first one (if there are multiple entries). |
| 132 | break; |
| 133 | }; |
| 134 | } |
| 135 | #else |
| 136 | GetSectionIntValue(0, "cpu family", &cpu_family); |
| 137 | #endif |
| 138 | if (id) { |
| 139 | *id = cpu_family; |
| 140 | } |
| 141 | return true; |
| 142 | } |
| 143 | |
| 144 | bool ProcCpuInfo::GetSectionStringValue(size_t section_num, |
| 145 | const std::string& key, |
| 146 | std::string* result) { |
| 147 | if (section_num >= sections_.size()) { |
| 148 | return false; |
| 149 | } |
| 150 | ConfigParser::SimpleMap::iterator iter = sections_[section_num].find(key); |
| 151 | if (iter == sections_[section_num].end()) { |
| 152 | return false; |
| 153 | } |
| 154 | *result = iter->second; |
| 155 | return true; |
| 156 | } |
| 157 | |
| 158 | bool ProcCpuInfo::GetSectionIntValue(size_t section_num, |
| 159 | const std::string& key, |
| 160 | int* result) { |
| 161 | if (section_num >= sections_.size()) { |
| 162 | return false; |
| 163 | } |
| 164 | ConfigParser::SimpleMap::iterator iter = sections_[section_num].find(key); |
| 165 | if (iter == sections_[section_num].end()) { |
| 166 | return false; |
| 167 | } |
| 168 | return FromString(iter->second, result); |
| 169 | } |
| 170 | |
| 171 | ConfigParser::ConfigParser() {} |
| 172 | |
| 173 | ConfigParser::~ConfigParser() {} |
| 174 | |
| 175 | bool ConfigParser::Open(const std::string& filename) { |
| 176 | FileStream* fs = new FileStream(); |
| 177 | if (!fs->Open(filename, "r", NULL)) { |
| 178 | return false; |
| 179 | } |
| 180 | instream_.reset(fs); |
| 181 | return true; |
| 182 | } |
| 183 | |
| 184 | void ConfigParser::Attach(StreamInterface* stream) { |
| 185 | instream_.reset(stream); |
| 186 | } |
| 187 | |
| 188 | bool ConfigParser::Parse(MapVector* key_val_pairs) { |
| 189 | // Parses the file and places the found key-value pairs into key_val_pairs. |
| 190 | SimpleMap section; |
| 191 | while (ParseSection(§ion)) { |
| 192 | key_val_pairs->push_back(section); |
| 193 | section.clear(); |
| 194 | } |
| 195 | return (!key_val_pairs->empty()); |
| 196 | } |
| 197 | |
| 198 | bool ConfigParser::ParseSection(SimpleMap* key_val_pair) { |
| 199 | // Parses the next section in the filestream and places the found key-value |
| 200 | // pairs into key_val_pair. |
| 201 | std::string key, value; |
| 202 | while (ParseLine(&key, &value)) { |
| 203 | (*key_val_pair)[key] = value; |
| 204 | } |
| 205 | return (!key_val_pair->empty()); |
| 206 | } |
| 207 | |
| 208 | bool ConfigParser::ParseLine(std::string* key, std::string* value) { |
| 209 | // Parses the next line in the filestream and places the found key-value |
| 210 | // pair into key and val. |
| 211 | std::string line; |
| 212 | if ((instream_->ReadLine(&line)) == SR_EOS) { |
| 213 | return false; |
| 214 | } |
| 215 | std::vector<std::string> tokens; |
| 216 | if (2 != split(line, ':', &tokens)) { |
| 217 | return false; |
| 218 | } |
| 219 | // Removes whitespace at the end of Key name |
| 220 | size_t pos = tokens[0].length() - 1; |
| 221 | while ((pos > 0) && isspace(tokens[0][pos])) { |
| 222 | pos--; |
| 223 | } |
| 224 | tokens[0].erase(pos + 1); |
| 225 | // Removes whitespace at the start of value |
| 226 | pos = 0; |
| 227 | while (pos < tokens[1].length() && isspace(tokens[1][pos])) { |
| 228 | pos++; |
| 229 | } |
| 230 | tokens[1].erase(0, pos); |
| 231 | *key = tokens[0]; |
| 232 | *value = tokens[1]; |
| 233 | return true; |
| 234 | } |
| 235 | |
| 236 | #if !defined(WEBRTC_CHROMIUM_BUILDs) |
| 237 | static bool ExpectLineFromStream(FileStream* stream, |
| 238 | std::string* out) { |
| 239 | StreamResult res = stream->ReadLine(out); |
| 240 | if (res != SR_SUCCESS) { |
| 241 | if (res != SR_EOS) { |
| 242 | LOG(LS_ERROR) << "Error when reading from stream"; |
| 243 | } else { |
| 244 | LOG(LS_ERROR) << "Incorrect number of lines in stream"; |
| 245 | } |
| 246 | return false; |
| 247 | } |
| 248 | return true; |
| 249 | } |
| 250 | |
| 251 | static void ExpectEofFromStream(FileStream* stream) { |
| 252 | std::string unused; |
| 253 | StreamResult res = stream->ReadLine(&unused); |
| 254 | if (res == SR_SUCCESS) { |
| 255 | LOG(LS_WARNING) << "Ignoring unexpected extra lines from stream"; |
| 256 | } else if (res != SR_EOS) { |
| 257 | LOG(LS_WARNING) << "Error when checking for extra lines from stream"; |
| 258 | } |
| 259 | } |
| 260 | |
| 261 | // For caching the lsb_release output (reading it invokes a sub-process and |
| 262 | // hence is somewhat expensive). |
| 263 | static std::string lsb_release_string; |
| 264 | static CriticalSection lsb_release_string_critsec; |
| 265 | |
| 266 | std::string ReadLinuxLsbRelease() { |
| 267 | CritScope cs(&lsb_release_string_critsec); |
| 268 | if (!lsb_release_string.empty()) { |
| 269 | // Have cached result from previous call. |
| 270 | return lsb_release_string; |
| 271 | } |
| 272 | // No cached result. Run lsb_release and parse output. |
| 273 | POpenStream lsb_release_output; |
| 274 | if (!lsb_release_output.Open("lsb_release -idrcs", "r", NULL)) { |
| 275 | LOG_ERR(LS_ERROR) << "Can't run lsb_release"; |
| 276 | return lsb_release_string; // empty |
| 277 | } |
| 278 | // Read in the command's output and build the string. |
| 279 | std::ostringstream sstr; |
| 280 | std::string line; |
| 281 | int wait_status; |
| 282 | |
| 283 | if (!ExpectLineFromStream(&lsb_release_output, &line)) { |
| 284 | return lsb_release_string; // empty |
| 285 | } |
| 286 | sstr << "DISTRIB_ID=" << line; |
| 287 | |
| 288 | if (!ExpectLineFromStream(&lsb_release_output, &line)) { |
| 289 | return lsb_release_string; // empty |
| 290 | } |
| 291 | sstr << " DISTRIB_DESCRIPTION=\"" << line << '"'; |
| 292 | |
| 293 | if (!ExpectLineFromStream(&lsb_release_output, &line)) { |
| 294 | return lsb_release_string; // empty |
| 295 | } |
| 296 | sstr << " DISTRIB_RELEASE=" << line; |
| 297 | |
| 298 | if (!ExpectLineFromStream(&lsb_release_output, &line)) { |
| 299 | return lsb_release_string; // empty |
| 300 | } |
| 301 | sstr << " DISTRIB_CODENAME=" << line; |
| 302 | |
| 303 | // Should not be anything left. |
| 304 | ExpectEofFromStream(&lsb_release_output); |
| 305 | |
| 306 | lsb_release_output.Close(); |
| 307 | wait_status = lsb_release_output.GetWaitStatus(); |
| 308 | if (wait_status == -1 || |
| 309 | !WIFEXITED(wait_status) || |
| 310 | WEXITSTATUS(wait_status) != 0) { |
| 311 | LOG(LS_WARNING) << "Unexpected exit status from lsb_release"; |
| 312 | } |
| 313 | |
| 314 | lsb_release_string = sstr.str(); |
| 315 | |
| 316 | return lsb_release_string; |
| 317 | } |
| 318 | #endif |
| 319 | |
| 320 | std::string ReadLinuxUname() { |
| 321 | struct utsname buf; |
| 322 | if (uname(&buf) < 0) { |
| 323 | LOG_ERR(LS_ERROR) << "Can't call uname()"; |
| 324 | return std::string(); |
| 325 | } |
| 326 | std::ostringstream sstr; |
| 327 | sstr << buf.sysname << " " |
| 328 | << buf.release << " " |
| 329 | << buf.version << " " |
| 330 | << buf.machine; |
| 331 | return sstr.str(); |
| 332 | } |
| 333 | |
| 334 | int ReadCpuMaxFreq() { |
| 335 | FileStream fs; |
| 336 | std::string str; |
| 337 | int freq = -1; |
| 338 | if (!fs.Open(kCpuMaxFreqFile, "r", NULL) || |
| 339 | SR_SUCCESS != fs.ReadLine(&str) || |
| 340 | !FromString(str, &freq)) { |
| 341 | return -1; |
| 342 | } |
| 343 | return freq; |
| 344 | } |
| 345 | |
| 346 | } // namespace rtc |
| 347 | |
| 348 | #endif // defined(WEBRTC_LINUX) |