base/logging.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/logging.h"
   6
   7 #if defined(OS_WIN)
   8 #include <io.h>
   9 #include <windows.h>
  10 #include "base/files/file_path.h"
  11 #include "base/files/file_util.h"
  12 typedef HANDLE FileHandle;
  13 typedef HANDLE MutexHandle;
  14 // Windows warns on using write().  It prefers _write().
  15 #define write(fd, buf, count) _write(fd, buf, static_cast<unsigned int>(count))
  16 // Windows doesn't define STDERR_FILENO.  Define it here.
  17 #define STDERR_FILENO 2
  18 #elif defined(OS_MACOSX)
  19 #include <mach/mach.h>
  20 #include <mach/mach_time.h>
  21 #include <mach-o/dyld.h>
  22 #elif defined(OS_POSIX)
  23 #if defined(OS_NACL)
  24 #include <sys/time.h>  // timespec doesn't seem to be in <time.h>
  25 #else
  26 #include <sys/syscall.h>
  27 #endif
  28 #include <time.h>
  29 #endif
  30
  31 #if defined(OS_POSIX)
  32 #include <errno.h>
  33 #include <pthread.h>
  34 #include <stdio.h>
  35 #include <stdlib.h>
  36 #include <string.h>
  37 #include <unistd.h>
  38 #define MAX_PATH PATH_MAX
  39 typedef FILE* FileHandle;
  40 typedef pthread_mutex_t* MutexHandle;
  41 #endif
  42
  43 #include <algorithm>
  44 #include <cstring>
  45 #include <ctime>
  46 #include <iomanip>
  47 #include <ostream>
  48 #include <string>
  49
  50 #include "base/base_switches.h"
  51 #include "base/command_line.h"
  52 #include "base/debug/alias.h"
  53 #include "base/debug/debugger.h"
  54 #include "base/debug/stack_trace.h"
  55 #include "base/posix/eintr_wrapper.h"
  56 #include "base/strings/string_piece.h"
  57 #include "base/strings/string_util.h"
  58 #include "base/strings/stringprintf.h"
  59 #include "base/strings/utf_string_conversions.h"
  60 #include "base/synchronization/lock_impl.h"
  61 #include "base/threading/platform_thread.h"
  62 #include "base/vlog.h"
  63 #if defined(OS_POSIX)
  64 #include "base/posix/safe_strerror.h"
  65 #endif
  66
  67 #if defined(OS_ANDROID)
  68 #include <android/log.h>
  69 #endif
  70
  71 namespace logging {
  72
  73 namespace {
  74
  75 VlogInfo* g_vlog_info = nullptr;
  76 VlogInfo* g_vlog_info_prev = nullptr;
  77
  78 const char* const log_severity_names[LOG_NUM_SEVERITIES] = {
  79   "INFO", "WARNING", "ERROR", "FATAL" };
  80
  81 const char* log_severity_name(int severity) {
  82   if (severity >= 0 && severity < LOG_NUM_SEVERITIES)
  83     return log_severity_names[severity];
  84   return "UNKNOWN";
  85 }
  86
  87 int g_min_log_level = 0;
  88
  89 LoggingDestination g_logging_destination = LOG_DEFAULT;
  90
  91 // For LOG_ERROR and above, always print to stderr.
  92 const int kAlwaysPrintErrorLevel = LOG_ERROR;
  93
  94 // Which log file to use? This is initialized by InitLogging or
  95 // will be lazily initialized to the default value when it is
  96 // first needed.
  97 #if defined(OS_WIN)
  98 typedef std::wstring PathString;
  99 #else
 100 typedef std::string PathString;
 101 #endif
 102 PathString* g_log_file_name = nullptr;
 103
 104 // This file is lazily opened and the handle may be nullptr
 105 FileHandle g_log_file = nullptr;
 106
 107 // What should be prepended to each message?
 108 bool g_log_process_id = false;
 109 bool g_log_thread_id = false;
 110 bool g_log_timestamp = true;
 111 bool g_log_tickcount = false;
 112
 113 // Should we pop up fatal debug messages in a dialog?
 114 bool show_error_dialogs = false;
 115
 116 // An assert handler override specified by the client to be called instead of
 117 // the debug message dialog and process termination.
 118 LogAssertHandlerFunction log_assert_handler = nullptr;
 119 // A log message handler that gets notified of every log message we process.
 120 LogMessageHandlerFunction log_message_handler = nullptr;
 121
 122 // Helper functions to wrap platform differences.
 123
 124 int32 CurrentProcessId() {
 125 #if defined(OS_WIN)
 126   return GetCurrentProcessId();
 127 #elif defined(OS_POSIX)
 128   return getpid();
 129 #endif
 130 }
 131
 132 uint64 TickCount() {
 133 #if defined(OS_WIN)
 134   return GetTickCount();
 135 #elif defined(OS_MACOSX)
 136   return mach_absolute_time();
 137 #elif defined(OS_NACL)
 138   // NaCl sadly does not have _POSIX_TIMERS enabled in sys/features.h
 139   // So we have to use clock() for now.
 140   return clock();
 141 #elif defined(OS_POSIX)
 142   struct timespec ts;
 143   clock_gettime(CLOCK_MONOTONIC, &ts);
 144
 145   uint64 absolute_micro =
 146     static_cast<int64>(ts.tv_sec) * 1000000 +
 147     static_cast<int64>(ts.tv_nsec) / 1000;
 148
 149   return absolute_micro;
 150 #endif
 151 }
 152
 153 void DeleteFilePath(const PathString& log_name) {
 154 #if defined(OS_WIN)
 155   DeleteFile(log_name.c_str());
 156 #elif defined(OS_NACL)
 157   // Do nothing; unlink() isn't supported on NaCl.
 158 #else
 159   unlink(log_name.c_str());
 160 #endif
 161 }
 162
 163 PathString GetDefaultLogFile() {
 164 #if defined(OS_WIN)
 165   // On Windows we use the same path as the exe.
 166   wchar_t module_name[MAX_PATH];
 167   GetModuleFileName(nullptr, module_name, MAX_PATH);
 168
 169   PathString log_name = module_name;
 170   PathString::size_type last_backslash = log_name.rfind('\\', log_name.size());
 171   if (last_backslash != PathString::npos)
 172     log_name.erase(last_backslash + 1);
 173   log_name += L"debug.log";
 174   return log_name;
 175 #elif defined(OS_POSIX)
 176   // On other platforms we just use the current directory.
 177   return PathString("debug.log");
 178 #endif
 179 }
 180
 181 // We don't need locks on Windows for atomically appending to files. The OS
 182 // provides this functionality.
 183 #if !defined(OS_WIN)
 184 // This class acts as a wrapper for locking the logging files.
 185 // LoggingLock::Init() should be called from the main thread before any logging
 186 // is done. Then whenever logging, be sure to have a local LoggingLock
 187 // instance on the stack. This will ensure that the lock is unlocked upon
 188 // exiting the frame.
 189 // LoggingLocks can not be nested.
 190 class LoggingLock {
 191  public:
 192   LoggingLock() {
 193     LockLogging();
 194   }
 195
 196   ~LoggingLock() {
 197     UnlockLogging();
 198   }
 199
 200   static void Init(LogLockingState lock_log, const PathChar* new_log_file) {
 201     if (initialized)
 202       return;
 203     lock_log_file = lock_log;
 204
 205     if (lock_log_file != LOCK_LOG_FILE)
 206       log_lock = new base::internal::LockImpl();
 207
 208     initialized = true;
 209   }
 210
 211  private:
 212   static void LockLogging() {
 213     if (lock_log_file == LOCK_LOG_FILE) {
 214 #if defined(OS_POSIX)
 215       pthread_mutex_lock(&log_mutex);
 216 #endif
 217     } else {
 218       // use the lock
 219       log_lock->Lock();
 220     }
 221   }
 222
 223   static void UnlockLogging() {
 224     if (lock_log_file == LOCK_LOG_FILE) {
 225 #if defined(OS_POSIX)
 226       pthread_mutex_unlock(&log_mutex);
 227 #endif
 228     } else {
 229       log_lock->Unlock();
 230     }
 231   }
 232
 233   // The lock is used if log file locking is false. It helps us avoid problems
 234   // with multiple threads writing to the log file at the same time.  Use
 235   // LockImpl directly instead of using Lock, because Lock makes logging calls.
 236   static base::internal::LockImpl* log_lock;
 237
 238   // When we don't use a lock, we are using a global mutex. We need to do this
 239   // because LockFileEx is not thread safe.
 240 #if defined(OS_POSIX)
 241   static pthread_mutex_t log_mutex;
 242 #endif
 243
 244   static bool initialized;
 245   static LogLockingState lock_log_file;
 246 };
 247
 248 // static
 249 bool LoggingLock::initialized = false;
 250 // static
 251 base::internal::LockImpl* LoggingLock::log_lock = nullptr;
 252 // static
 253 LogLockingState LoggingLock::lock_log_file = LOCK_LOG_FILE;
 254
 255 #if defined(OS_POSIX)
 256 pthread_mutex_t LoggingLock::log_mutex = PTHREAD_MUTEX_INITIALIZER;
 257 #endif
 258
 259 #endif  // OS_WIN
 260
 261 // Called by logging functions to ensure that |g_log_file| is initialized
 262 // and can be used for writing. Returns false if the file could not be
 263 // initialized. |g_log_file| will be nullptr in this case.
 264 bool InitializeLogFileHandle() {
 265   if (g_log_file)
 266     return true;
 267
 268   if (!g_log_file_name) {
 269     // Nobody has called InitLogging to specify a debug log file, so here we
 270     // initialize the log file name to a default.
 271     g_log_file_name = new PathString(GetDefaultLogFile());
 272   }
 273
 274   if ((g_logging_destination & LOG_TO_FILE) != 0) {
 275 #if defined(OS_WIN)
 276     // The FILE_APPEND_DATA access mask ensures that the file is atomically
 277     // appended to across accesses from multiple threads.
 278     // https://msdn.microsoft.com/en-us/library/windows/desktop/aa364399(v=vs.85).aspx
 279     // https://msdn.microsoft.com/en-us/library/windows/desktop/aa363858(v=vs.85).aspx
 280     g_log_file = CreateFile(g_log_file_name->c_str(), FILE_APPEND_DATA,
 281                             FILE_SHARE_READ | FILE_SHARE_WRITE, nullptr,
 282                             OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, nullptr);
 283     if (g_log_file == INVALID_HANDLE_VALUE || g_log_file == nullptr) {
 284       // try the current directory
 285       base::FilePath file_path;
 286       if (!base::GetCurrentDirectory(&file_path))
 287         return false;
 288
 289       *g_log_file_name = file_path.Append(
 290           FILE_PATH_LITERAL("debug.log")).value();
 291
 292       g_log_file = CreateFile(g_log_file_name->c_str(), FILE_APPEND_DATA,
 293                               FILE_SHARE_READ | FILE_SHARE_WRITE, nullptr,
 294                               OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, nullptr);
 295       if (g_log_file == INVALID_HANDLE_VALUE || g_log_file == nullptr) {
 296         g_log_file = nullptr;
 297         return false;
 298       }
 299     }
 300 #elif defined(OS_POSIX)
 301     g_log_file = fopen(g_log_file_name->c_str(), "a");
 302     if (g_log_file == nullptr)
 303       return false;
 304 #endif
 305   }
 306
 307   return true;
 308 }
 309
 310 void CloseFile(FileHandle log) {
 311 #if defined(OS_WIN)
 312   CloseHandle(log);
 313 #else
 314   fclose(log);
 315 #endif
 316 }
 317
 318 void CloseLogFileUnlocked() {
 319   if (!g_log_file)
 320     return;
 321
 322   CloseFile(g_log_file);
 323   g_log_file = nullptr;
 324 }
 325
 326 }  // namespace
 327
 328 LoggingSettings::LoggingSettings()
 329     : logging_dest(LOG_DEFAULT),
 330       log_file(nullptr),
 331       lock_log(LOCK_LOG_FILE),
 332       delete_old(APPEND_TO_OLD_LOG_FILE) {}
 333
 334 bool BaseInitLoggingImpl(const LoggingSettings& settings) {
 335 #if defined(OS_NACL)
 336   // Can log only to the system debug log.
 337   CHECK_EQ(settings.logging_dest & ~LOG_TO_SYSTEM_DEBUG_LOG, 0);
 338 #endif
 339   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
 340   // Don't bother initializing |g_vlog_info| unless we use one of the
 341   // vlog switches.
 342   if (command_line->HasSwitch(switches::kV) ||
 343       command_line->HasSwitch(switches::kVModule)) {
 344     // NOTE: If |g_vlog_info| has already been initialized, it might be in use
 345     // by another thread. Don't delete the old VLogInfo, just create a second
 346     // one. We keep track of both to avoid memory leak warnings.
 347     CHECK(!g_vlog_info_prev);
 348     g_vlog_info_prev = g_vlog_info;
 349
 350     g_vlog_info =
 351         new VlogInfo(command_line->GetSwitchValueASCII(switches::kV),
 352                      command_line->GetSwitchValueASCII(switches::kVModule),
 353                      &g_min_log_level);
 354   }
 355
 356   g_logging_destination = settings.logging_dest;
 357
 358   // ignore file options unless logging to file is set.
 359   if ((g_logging_destination & LOG_TO_FILE) == 0)
 360     return true;
 361
 362 #if !defined(OS_WIN)
 363   LoggingLock::Init(settings.lock_log, settings.log_file);
 364   LoggingLock logging_lock;
 365 #endif
 366
 367   // Calling InitLogging twice or after some log call has already opened the
 368   // default log file will re-initialize to the new options.
 369   CloseLogFileUnlocked();
 370
 371   if (!g_log_file_name)
 372     g_log_file_name = new PathString();
 373   *g_log_file_name = settings.log_file;
 374   if (settings.delete_old == DELETE_OLD_LOG_FILE)
 375     DeleteFilePath(*g_log_file_name);
 376
 377   return InitializeLogFileHandle();
 378 }
 379
 380 void SetMinLogLevel(int level) {
 381   g_min_log_level = std::min(LOG_FATAL, level);
 382 }
 383
 384 int GetMinLogLevel() {
 385   return g_min_log_level;
 386 }
 387
 388 int GetVlogVerbosity() {
 389   return std::max(-1, LOG_INFO - GetMinLogLevel());
 390 }
 391
 392 int GetVlogLevelHelper(const char* file, size_t N) {
 393   DCHECK_GT(N, 0U);
 394   // Note: |g_vlog_info| may change on a different thread during startup
 395   // (but will always be valid or nullptr).
 396   VlogInfo* vlog_info = g_vlog_info;
 397   return vlog_info ?
 398       vlog_info->GetVlogLevel(base::StringPiece(file, N - 1)) :
 399       GetVlogVerbosity();
 400 }
 401
 402 void SetLogItems(bool enable_process_id, bool enable_thread_id,
 403                  bool enable_timestamp, bool enable_tickcount) {
 404   g_log_process_id = enable_process_id;
 405   g_log_thread_id = enable_thread_id;
 406   g_log_timestamp = enable_timestamp;
 407   g_log_tickcount = enable_tickcount;
 408 }
 409
 410 void SetShowErrorDialogs(bool enable_dialogs) {
 411   show_error_dialogs = enable_dialogs;
 412 }
 413
 414 void SetLogAssertHandler(LogAssertHandlerFunction handler) {
 415   log_assert_handler = handler;
 416 }
 417
 418 void SetLogMessageHandler(LogMessageHandlerFunction handler) {
 419   log_message_handler = handler;
 420 }
 421
 422 LogMessageHandlerFunction GetLogMessageHandler() {
 423   return log_message_handler;
 424 }
 425
 426 // Explicit instantiations for commonly used comparisons.
 427 template std::string* MakeCheckOpString<int, int>(
 428     const int&, const int&, const char* names);
 429 template std::string* MakeCheckOpString<unsigned long, unsigned long>(
 430     const unsigned long&, const unsigned long&, const char* names);
 431 template std::string* MakeCheckOpString<unsigned long, unsigned int>(
 432     const unsigned long&, const unsigned int&, const char* names);
 433 template std::string* MakeCheckOpString<unsigned int, unsigned long>(
 434     const unsigned int&, const unsigned long&, const char* names);
 435 template std::string* MakeCheckOpString<std::string, std::string>(
 436     const std::string&, const std::string&, const char* name);
 437
 438 #if !defined(NDEBUG)
 439 // Displays a message box to the user with the error message in it.
 440 // Used for fatal messages, where we close the app simultaneously.
 441 // This is for developers only; we don't use this in circumstances
 442 // (like release builds) where users could see it, since users don't
 443 // understand these messages anyway.
 444 void DisplayDebugMessageInDialog(const std::string& str) {
 445   if (str.empty())
 446     return;
 447
 448   if (!show_error_dialogs)
 449     return;
 450
 451 #if defined(OS_WIN)
 452   // For Windows programs, it's possible that the message loop is
 453   // messed up on a fatal error, and creating a MessageBox will cause
 454   // that message loop to be run. Instead, we try to spawn another
 455   // process that displays its command line. We look for "Debug
 456   // Message.exe" in the same directory as the application. If it
 457   // exists, we use it, otherwise, we use a regular message box.
 458   wchar_t prog_name[MAX_PATH];
 459   GetModuleFileNameW(nullptr, prog_name, MAX_PATH);
 460   wchar_t* backslash = wcsrchr(prog_name, '\\');
 461   if (backslash)
 462     backslash[1] = 0;
 463   wcscat_s(prog_name, MAX_PATH, L"debug_message.exe");
 464
 465   std::wstring cmdline = base::UTF8ToWide(str);
 466   if (cmdline.empty())
 467     return;
 468
 469   STARTUPINFO startup_info;
 470   memset(&startup_info, 0, sizeof(startup_info));
 471   startup_info.cb = sizeof(startup_info);
 472
 473   PROCESS_INFORMATION process_info;
 474   if (CreateProcessW(prog_name, &cmdline[0], nullptr, nullptr, false, 0,
 475                      nullptr, nullptr, &startup_info, &process_info)) {
 476     WaitForSingleObject(process_info.hProcess, INFINITE);
 477     CloseHandle(process_info.hThread);
 478     CloseHandle(process_info.hProcess);
 479   } else {
 480     // debug process broken, let's just do a message box
 481     MessageBoxW(nullptr, &cmdline[0], L"Fatal error",
 482                 MB_OK | MB_ICONHAND | MB_TOPMOST);
 483   }
 484 #else
 485   // We intentionally don't implement a dialog on other platforms.
 486   // You can just look at stderr.
 487 #endif  // defined(OS_WIN)
 488 }
 489 #endif  // !defined(NDEBUG)
 490
 491 #if defined(OS_WIN)
 492 LogMessage::SaveLastError::SaveLastError() : last_error_(::GetLastError()) {
 493 }
 494
 495 LogMessage::SaveLastError::~SaveLastError() {
 496   ::SetLastError(last_error_);
 497 }
 498 #endif  // defined(OS_WIN)
 499
 500 LogMessage::LogMessage(const char* file, int line, LogSeverity severity)
 501     : severity_(severity), file_(file), line_(line) {
 502   Init(file, line);
 503 }
 504
 505 LogMessage::LogMessage(const char* file, int line, const char* condition)
 506     : severity_(LOG_FATAL), file_(file), line_(line) {
 507   Init(file, line);
 508   stream_ << "Check failed: " << condition << ". ";
 509 }
 510
 511 LogMessage::LogMessage(const char* file, int line, std::string* result)
 512     : severity_(LOG_FATAL), file_(file), line_(line) {
 513   Init(file, line);
 514   stream_ << "Check failed: " << *result;
 515   delete result;
 516 }
 517
 518 LogMessage::LogMessage(const char* file, int line, LogSeverity severity,
 519                        std::string* result)
 520     : severity_(severity), file_(file), line_(line) {
 521   Init(file, line);
 522   stream_ << "Check failed: " << *result;
 523   delete result;
 524 }
 525
 526 LogMessage::~LogMessage() {
 527 #if !defined(OFFICIAL_BUILD) && !defined(OS_NACL) && !defined(__UCLIBC__)
 528   if (severity_ == LOG_FATAL && !base::debug::BeingDebugged()) {
 529     // Include a stack trace on a fatal, unless a debugger is attached.
 530     base::debug::StackTrace trace;
 531     stream_ << std::endl;  // Newline to separate from log message.
 532     trace.OutputToStream(&stream_);
 533   }
 534 #endif
 535   stream_ << std::endl;
 536   std::string str_newline(stream_.str());
 537
 538   // Give any log message handler first dibs on the message.
 539   if (log_message_handler &&
 540       log_message_handler(severity_, file_, line_,
 541                           message_start_, str_newline)) {
 542     // The handler took care of it, no further processing.
 543     return;
 544   }
 545
 546   if ((g_logging_destination & LOG_TO_SYSTEM_DEBUG_LOG) != 0) {
 547 #if defined(OS_WIN)
 548     OutputDebugStringA(str_newline.c_str());
 549 #elif defined(OS_ANDROID)
 550     android_LogPriority priority =
 551         (severity_ < 0) ? ANDROID_LOG_VERBOSE : ANDROID_LOG_UNKNOWN;
 552     switch (severity_) {
 553       case LOG_INFO:
 554         priority = ANDROID_LOG_INFO;
 555         break;
 556       case LOG_WARNING:
 557         priority = ANDROID_LOG_WARN;
 558         break;
 559       case LOG_ERROR:
 560         priority = ANDROID_LOG_ERROR;
 561         break;
 562       case LOG_FATAL:
 563         priority = ANDROID_LOG_FATAL;
 564         break;
 565     }
 566     __android_log_write(priority, "chromium", str_newline.c_str());
 567 #endif
 568     ignore_result(fwrite(str_newline.data(), str_newline.size(), 1, stderr));
 569     fflush(stderr);
 570   } else if (severity_ >= kAlwaysPrintErrorLevel) {
 571     // When we're only outputting to a log file, above a certain log level, we
 572     // should still output to stderr so that we can better detect and diagnose
 573     // problems with unit tests, especially on the buildbots.
 574     ignore_result(fwrite(str_newline.data(), str_newline.size(), 1, stderr));
 575     fflush(stderr);
 576   }
 577
 578   // write to log file
 579   if ((g_logging_destination & LOG_TO_FILE) != 0) {
 580     // We can have multiple threads and/or processes, so try to prevent them
 581     // from clobbering each other's writes.
 582     // If the client app did not call InitLogging, and the lock has not
 583     // been created do it now. We do this on demand, but if two threads try
 584     // to do this at the same time, there will be a race condition to create
 585     // the lock. This is why InitLogging should be called from the main
 586     // thread at the beginning of execution.
 587 #if !defined(OS_WIN)
 588     LoggingLock::Init(LOCK_LOG_FILE, nullptr);
 589     LoggingLock logging_lock;
 590 #endif
 591     if (InitializeLogFileHandle()) {
 592 #if defined(OS_WIN)
 593       DWORD num_written;
 594       WriteFile(g_log_file,
 595                 static_cast<const void*>(str_newline.c_str()),
 596                 static_cast<DWORD>(str_newline.length()),
 597                 &num_written,
 598                 nullptr);
 599 #else
 600       ignore_result(fwrite(
 601           str_newline.data(), str_newline.size(), 1, g_log_file));
 602       fflush(g_log_file);
 603 #endif
 604     }
 605   }
 606
 607   if (severity_ == LOG_FATAL) {
 608     // Ensure the first characters of the string are on the stack so they
 609     // are contained in minidumps for diagnostic purposes.
 610     char str_stack[1024];
 611     str_newline.copy(str_stack, arraysize(str_stack));
 612     base::debug::Alias(str_stack);
 613
 614     if (log_assert_handler) {
 615       // Make a copy of the string for the handler out of paranoia.
 616       log_assert_handler(std::string(stream_.str()));
 617     } else {
 618       // Don't use the string with the newline, get a fresh version to send to
 619       // the debug message process. We also don't display assertions to the
 620       // user in release mode. The enduser can't do anything with this
 621       // information, and displaying message boxes when the application is
 622       // hosed can cause additional problems.
 623 #ifndef NDEBUG
 624       if (!base::debug::BeingDebugged()) {
 625         // Displaying a dialog is unnecessary when debugging and can complicate
 626         // debugging.
 627         DisplayDebugMessageInDialog(stream_.str());
 628       }
 629 #endif
 630       // Crash the process to generate a dump.
 631       base::debug::BreakDebugger();
 632     }
 633   }
 634 }
 635
 636 // writes the common header info to the stream
 637 void LogMessage::Init(const char* file, int line) {
 638   base::StringPiece filename(file);
 639   size_t last_slash_pos = filename.find_last_of("\\/");
 640   if (last_slash_pos != base::StringPiece::npos)
 641     filename.remove_prefix(last_slash_pos + 1);
 642
 643   // TODO(darin): It might be nice if the columns were fixed width.
 644
 645   stream_ <<  '[';
 646   if (g_log_process_id)
 647     stream_ << CurrentProcessId() << ':';
 648   if (g_log_thread_id)
 649     stream_ << base::PlatformThread::CurrentId() << ':';
 650   if (g_log_timestamp) {
 651     time_t t = time(nullptr);
 652     struct tm local_time = {0};
 653 #ifdef _MSC_VER
 654     localtime_s(&local_time, &t);
 655 #else
 656     localtime_r(&t, &local_time);
 657 #endif
 658     struct tm* tm_time = &local_time;
 659     stream_ << std::setfill('0')
 660             << std::setw(2) << 1 + tm_time->tm_mon
 661             << std::setw(2) << tm_time->tm_mday
 662             << '/'
 663             << std::setw(2) << tm_time->tm_hour
 664             << std::setw(2) << tm_time->tm_min
 665             << std::setw(2) << tm_time->tm_sec
 666             << ':';
 667   }
 668   if (g_log_tickcount)
 669     stream_ << TickCount() << ':';
 670   if (severity_ >= 0)
 671     stream_ << log_severity_name(severity_);
 672   else
 673     stream_ << "VERBOSE" << -severity_;
 674
 675   stream_ << ":" << filename << "(" << line << ")] ";
 676
 677   message_start_ = stream_.str().length();
 678 }
 679
 680 #if defined(OS_WIN)
 681 // This has already been defined in the header, but defining it again as DWORD
 682 // ensures that the type used in the header is equivalent to DWORD. If not,
 683 // the redefinition is a compile error.
 684 typedef DWORD SystemErrorCode;
 685 #endif
 686
 687 SystemErrorCode GetLastSystemErrorCode() {
 688 #if defined(OS_WIN)
 689   return ::GetLastError();
 690 #elif defined(OS_POSIX)
 691   return errno;
 692 #else
 693 #error Not implemented
 694 #endif
 695 }
 696
 697 #if defined(OS_WIN)
 698 BASE_EXPORT std::string SystemErrorCodeToString(SystemErrorCode error_code) {
 699   const int kErrorMessageBufferSize = 256;
 700   char msgbuf[kErrorMessageBufferSize];
 701   DWORD flags = FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS;
 702   DWORD len = FormatMessageA(flags, nullptr, error_code, 0, msgbuf,
 703                              arraysize(msgbuf), nullptr);
 704   if (len) {
 705     // Messages returned by system end with line breaks.
 706     return base::CollapseWhitespaceASCII(msgbuf, true) +
 707         base::StringPrintf(" (0x%X)", error_code);
 708   }
 709   return base::StringPrintf("Error (0x%X) while retrieving error. (0x%X)",
 710                             GetLastError(), error_code);
 711 }
 712 #elif defined(OS_POSIX)
 713 BASE_EXPORT std::string SystemErrorCodeToString(SystemErrorCode error_code) {
 714   return base::safe_strerror(error_code);
 715 }
 716 #else
 717 #error Not implemented
 718 #endif  // defined(OS_WIN)
 719
 720
 721 #if defined(OS_WIN)
 722 Win32ErrorLogMessage::Win32ErrorLogMessage(const char* file,
 723                                            int line,
 724                                            LogSeverity severity,
 725                                            SystemErrorCode err)
 726     : err_(err),
 727       log_message_(file, line, severity) {
 728 }
 729
 730 Win32ErrorLogMessage::~Win32ErrorLogMessage() {
 731   stream() << ": " << SystemErrorCodeToString(err_);
 732   // We're about to crash (CHECK). Put |err_| on the stack (by placing it in a
 733   // field) and use Alias in hopes that it makes it into crash dumps.
 734   DWORD last_error = err_;
 735   base::debug::Alias(&last_error);
 736 }
 737 #elif defined(OS_POSIX)
 738 ErrnoLogMessage::ErrnoLogMessage(const char* file,
 739                                  int line,
 740                                  LogSeverity severity,
 741                                  SystemErrorCode err)
 742     : err_(err),
 743       log_message_(file, line, severity) {
 744 }
 745
 746 ErrnoLogMessage::~ErrnoLogMessage() {
 747   stream() << ": " << SystemErrorCodeToString(err_);
 748 }
 749 #endif  // defined(OS_WIN)
 750
 751 void CloseLogFile() {
 752 #if !defined(OS_WIN)
 753   LoggingLock logging_lock;
 754 #endif
 755   CloseLogFileUnlocked();
 756 }
 757
 758 void RawLog(int level, const char* message) {
 759   if (level >= g_min_log_level) {
 760     size_t bytes_written = 0;
 761     const size_t message_len = strlen(message);
 762     int rv;
 763     while (bytes_written < message_len) {
 764       rv = HANDLE_EINTR(
 765           write(STDERR_FILENO, message + bytes_written,
 766                 message_len - bytes_written));
 767       if (rv < 0) {
 768         // Give up, nothing we can do now.
 769         break;
 770       }
 771       bytes_written += rv;
 772     }
 773
 774     if (message_len > 0 && message[message_len - 1] != '\n') {
 775       do {
 776         rv = HANDLE_EINTR(write(STDERR_FILENO, "\n", 1));
 777         if (rv < 0) {
 778           // Give up, nothing we can do now.
 779           break;
 780         }
 781       } while (rv != 1);
 782     }
 783   }
 784
 785   if (level == LOG_FATAL)
 786     base::debug::BreakDebugger();
 787 }
 788
 789 // This was defined at the beginning of this file.
 790 #undef write
 791
 792 #if defined(OS_WIN)
 793 bool IsLoggingToFileEnabled() {
 794   return g_logging_destination & LOG_TO_FILE;
 795 }
 796
 797 std::wstring GetLogFileFullPath() {
 798   if (g_log_file_name)
 799     return *g_log_file_name;
 800   return std::wstring();
 801 }
 802 #endif
 803
 804 BASE_EXPORT void LogErrorNotReached(const char* file, int line) {
 805   LogMessage(file, line, LOG_ERROR).stream()
 806       << "NOTREACHED() hit.";
 807 }
 808
 809 }  // namespace logging
 810
 811 std::ostream& std::operator<<(std::ostream& out, const wchar_t* wstr) {
 812   return out << base::WideToUTF8(wstr);
 813 }