logging.cc revision d5335d37310036a1236ba3f4195afbdc55a85b5a
1// Copyright (c) 2010 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> 10typedef HANDLE FileHandle; 11typedef HANDLE MutexHandle; 12// Windows warns on using write(). It prefers _write(). 13#define write(fd, buf, count) _write(fd, buf, static_cast<unsigned int>(count)) 14// Windows doesn't define STDERR_FILENO. Define it here. 15#define STDERR_FILENO 2 16#elif defined(OS_MACOSX) 17#include <CoreFoundation/CoreFoundation.h> 18#include <mach/mach.h> 19#include <mach/mach_time.h> 20#include <mach-o/dyld.h> 21#elif defined(OS_POSIX) 22#include <sys/syscall.h> 23#include <time.h> 24#endif 25 26#if defined(OS_POSIX) 27#include <errno.h> 28#include <pthread.h> 29#include <stdlib.h> 30#include <stdio.h> 31#include <string.h> 32#include <unistd.h> 33#define MAX_PATH PATH_MAX 34typedef FILE* FileHandle; 35typedef pthread_mutex_t* MutexHandle; 36#endif 37 38#include <ctime> 39#include <iomanip> 40#include <cstring> 41#include <algorithm> 42 43#include "base/base_switches.h" 44#include "base/command_line.h" 45#include "base/debug/debugger.h" 46#include "base/debug/stack_trace.h" 47#include "base/eintr_wrapper.h" 48#include "base/lock_impl.h" 49#if defined(OS_POSIX) 50#include "base/safe_strerror_posix.h" 51#endif 52#include "base/process_util.h" 53#include "base/string_piece.h" 54#include "base/utf_string_conversions.h" 55#ifndef ANDROID 56#include "base/vlog.h" 57#endif 58 59namespace logging { 60 61bool g_enable_dcheck = false; 62#ifndef ANDROID 63VlogInfo* g_vlog_info = NULL; 64#endif 65 66const char* const log_severity_names[LOG_NUM_SEVERITIES] = { 67 "INFO", "WARNING", "ERROR", "ERROR_REPORT", "FATAL" }; 68 69int min_log_level = 0; 70 71// The default set here for logging_destination will only be used if 72// InitLogging is not called. On Windows, use a file next to the exe; 73// on POSIX platforms, where it may not even be possible to locate the 74// executable on disk, use stderr. 75#if defined(OS_WIN) 76LoggingDestination logging_destination = LOG_ONLY_TO_FILE; 77#elif defined(OS_POSIX) 78LoggingDestination logging_destination = LOG_ONLY_TO_SYSTEM_DEBUG_LOG; 79#endif 80 81// For LOG_ERROR and above, always print to stderr. 82const int kAlwaysPrintErrorLevel = LOG_ERROR; 83 84// Which log file to use? This is initialized by InitLogging or 85// will be lazily initialized to the default value when it is 86// first needed. 87#if defined(OS_WIN) 88typedef std::wstring PathString; 89#else 90typedef std::string PathString; 91#endif 92PathString* log_file_name = NULL; 93 94// this file is lazily opened and the handle may be NULL 95FileHandle log_file = NULL; 96 97// what should be prepended to each message? 98bool log_process_id = false; 99bool log_thread_id = false; 100bool log_timestamp = true; 101bool log_tickcount = false; 102 103// Should we pop up fatal debug messages in a dialog? 104bool show_error_dialogs = false; 105 106// An assert handler override specified by the client to be called instead of 107// the debug message dialog and process termination. 108LogAssertHandlerFunction log_assert_handler = NULL; 109// An report handler override specified by the client to be called instead of 110// the debug message dialog. 111LogReportHandlerFunction log_report_handler = NULL; 112// A log message handler that gets notified of every log message we process. 113LogMessageHandlerFunction log_message_handler = NULL; 114 115// Helper functions to wrap platform differences. 116 117int32 CurrentProcessId() { 118#if defined(OS_WIN) 119 return GetCurrentProcessId(); 120#elif defined(OS_POSIX) 121 return getpid(); 122#endif 123} 124 125int32 CurrentThreadId() { 126#if defined(OS_WIN) 127 return GetCurrentThreadId(); 128#elif defined(OS_MACOSX) 129 return mach_thread_self(); 130#elif defined(OS_LINUX) 131 return syscall(__NR_gettid); 132#elif defined(OS_FREEBSD) 133 // TODO(BSD): find a better thread ID 134 return reinterpret_cast<int64>(pthread_self()); 135#endif 136} 137 138uint64 TickCount() { 139#if defined(OS_WIN) 140 return GetTickCount(); 141#elif defined(OS_MACOSX) 142 return mach_absolute_time(); 143#elif defined(OS_POSIX) 144 struct timespec ts; 145 clock_gettime(CLOCK_MONOTONIC, &ts); 146 147 uint64 absolute_micro = 148 static_cast<int64>(ts.tv_sec) * 1000000 + 149 static_cast<int64>(ts.tv_nsec) / 1000; 150 151 return absolute_micro; 152#endif 153} 154 155void CloseFile(FileHandle log) { 156#if defined(OS_WIN) 157 CloseHandle(log); 158#else 159 fclose(log); 160#endif 161} 162 163void DeleteFilePath(const PathString& log_name) { 164#if defined(OS_WIN) 165 DeleteFile(log_name.c_str()); 166#else 167 unlink(log_name.c_str()); 168#endif 169} 170 171PathString GetDefaultLogFile() { 172#if defined(OS_WIN) 173 // On Windows we use the same path as the exe. 174 wchar_t module_name[MAX_PATH]; 175 GetModuleFileName(NULL, module_name, MAX_PATH); 176 177 PathString log_file = module_name; 178 PathString::size_type last_backslash = 179 log_file.rfind('\\', log_file.size()); 180 if (last_backslash != PathString::npos) 181 log_file.erase(last_backslash + 1); 182 log_file += L"debug.log"; 183 return log_file; 184#elif defined(OS_POSIX) 185 // On other platforms we just use the current directory. 186 return PathString("debug.log"); 187#endif 188} 189 190// This class acts as a wrapper for locking the logging files. 191// LoggingLock::Init() should be called from the main thread before any logging 192// is done. Then whenever logging, be sure to have a local LoggingLock 193// instance on the stack. This will ensure that the lock is unlocked upon 194// exiting the frame. 195// LoggingLocks can not be nested. 196class LoggingLock { 197 public: 198 LoggingLock() { 199 LockLogging(); 200 } 201 202 ~LoggingLock() { 203 UnlockLogging(); 204 } 205 206 static void Init(LogLockingState lock_log, const PathChar* new_log_file) { 207 if (initialized) 208 return; 209 lock_log_file = lock_log; 210 if (lock_log_file == LOCK_LOG_FILE) { 211#if defined(OS_WIN) 212 if (!log_mutex) { 213 std::wstring safe_name; 214 if (new_log_file) 215 safe_name = new_log_file; 216 else 217 safe_name = GetDefaultLogFile(); 218 // \ is not a legal character in mutex names so we replace \ with / 219 std::replace(safe_name.begin(), safe_name.end(), '\\', '/'); 220 std::wstring t(L"Global\\"); 221 t.append(safe_name); 222 log_mutex = ::CreateMutex(NULL, FALSE, t.c_str()); 223 224 if (log_mutex == NULL) { 225#if DEBUG 226 // Keep the error code for debugging 227 int error = GetLastError(); // NOLINT 228 base::debug::BreakDebugger(); 229#endif 230 // Return nicely without putting initialized to true. 231 return; 232 } 233 } 234#endif 235 } else { 236 log_lock = new LockImpl(); 237 } 238 initialized = true; 239 } 240 241 private: 242 static void LockLogging() { 243 if (lock_log_file == LOCK_LOG_FILE) { 244#if defined(OS_WIN) 245 ::WaitForSingleObject(log_mutex, INFINITE); 246 // WaitForSingleObject could have returned WAIT_ABANDONED. We don't 247 // abort the process here. UI tests might be crashy sometimes, 248 // and aborting the test binary only makes the problem worse. 249 // We also don't use LOG macros because that might lead to an infinite 250 // loop. For more info see http://crbug.com/18028. 251#elif defined(OS_POSIX) 252 pthread_mutex_lock(&log_mutex); 253#endif 254 } else { 255 // use the lock 256 log_lock->Lock(); 257 } 258 } 259 260 static void UnlockLogging() { 261 if (lock_log_file == LOCK_LOG_FILE) { 262#if defined(OS_WIN) 263 ReleaseMutex(log_mutex); 264#elif defined(OS_POSIX) 265 pthread_mutex_unlock(&log_mutex); 266#endif 267 } else { 268 log_lock->Unlock(); 269 } 270 } 271 272 // The lock is used if log file locking is false. It helps us avoid problems 273 // with multiple threads writing to the log file at the same time. Use 274 // LockImpl directly instead of using Lock, because Lock makes logging calls. 275 static LockImpl* log_lock; 276 277 // When we don't use a lock, we are using a global mutex. We need to do this 278 // because LockFileEx is not thread safe. 279#if defined(OS_WIN) 280 static MutexHandle log_mutex; 281#elif defined(OS_POSIX) 282 static pthread_mutex_t log_mutex; 283#endif 284 285 static bool initialized; 286 static LogLockingState lock_log_file; 287}; 288 289// static 290bool LoggingLock::initialized = false; 291// static 292LockImpl* LoggingLock::log_lock = NULL; 293// static 294LogLockingState LoggingLock::lock_log_file = LOCK_LOG_FILE; 295 296#if defined(OS_WIN) 297// static 298MutexHandle LoggingLock::log_mutex = NULL; 299#elif defined(OS_POSIX) 300pthread_mutex_t LoggingLock::log_mutex = PTHREAD_MUTEX_INITIALIZER; 301#endif 302 303// Called by logging functions to ensure that debug_file is initialized 304// and can be used for writing. Returns false if the file could not be 305// initialized. debug_file will be NULL in this case. 306bool InitializeLogFileHandle() { 307 if (log_file) 308 return true; 309 310 if (!log_file_name) { 311 // Nobody has called InitLogging to specify a debug log file, so here we 312 // initialize the log file name to a default. 313 log_file_name = new PathString(GetDefaultLogFile()); 314 } 315 316 if (logging_destination == LOG_ONLY_TO_FILE || 317 logging_destination == LOG_TO_BOTH_FILE_AND_SYSTEM_DEBUG_LOG) { 318#if defined(OS_WIN) 319 log_file = CreateFile(log_file_name->c_str(), GENERIC_WRITE, 320 FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, 321 OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL); 322 if (log_file == INVALID_HANDLE_VALUE || log_file == NULL) { 323 // try the current directory 324 log_file = CreateFile(L".\\debug.log", GENERIC_WRITE, 325 FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, 326 OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL); 327 if (log_file == INVALID_HANDLE_VALUE || log_file == NULL) { 328 log_file = NULL; 329 return false; 330 } 331 } 332 SetFilePointer(log_file, 0, 0, FILE_END); 333#elif defined(OS_POSIX) 334 log_file = fopen(log_file_name->c_str(), "a"); 335 if (log_file == NULL) 336 return false; 337#endif 338 } 339 340 return true; 341} 342 343bool BaseInitLoggingImpl(const PathChar* new_log_file, 344 LoggingDestination logging_dest, 345 LogLockingState lock_log, 346 OldFileDeletionState delete_old) { 347#ifdef ANDROID 348 g_enable_dcheck = false; 349#else 350 CommandLine* command_line = CommandLine::ForCurrentProcess(); 351 g_enable_dcheck = 352 command_line->HasSwitch(switches::kEnableDCHECK); 353 delete g_vlog_info; 354 g_vlog_info = NULL; 355 // Don't bother initializing g_vlog_info unless we use one of the 356 // vlog switches. 357 if (command_line->HasSwitch(switches::kV) || 358 command_line->HasSwitch(switches::kVModule)) { 359 g_vlog_info = 360 new VlogInfo(command_line->GetSwitchValueASCII(switches::kV), 361 command_line->GetSwitchValueASCII(switches::kVModule), 362 &min_log_level); 363 } 364#endif 365 366 LoggingLock::Init(lock_log, new_log_file); 367 368 LoggingLock logging_lock; 369 370 if (log_file) { 371 // calling InitLogging twice or after some log call has already opened the 372 // default log file will re-initialize to the new options 373 CloseFile(log_file); 374 log_file = NULL; 375 } 376 377 logging_destination = logging_dest; 378 379 // ignore file options if logging is disabled or only to system 380 if (logging_destination == LOG_NONE || 381 logging_destination == LOG_ONLY_TO_SYSTEM_DEBUG_LOG) 382 return true; 383 384 if (!log_file_name) 385 log_file_name = new PathString(); 386 *log_file_name = new_log_file; 387 if (delete_old == DELETE_OLD_LOG_FILE) 388 DeleteFilePath(*log_file_name); 389 390 return InitializeLogFileHandle(); 391} 392 393void SetMinLogLevel(int level) { 394 min_log_level = std::min(LOG_ERROR_REPORT, level); 395} 396 397int GetMinLogLevel() { 398 return min_log_level; 399} 400 401int GetVlogVerbosity() { 402 return std::max(-1, LOG_INFO - GetMinLogLevel()); 403} 404 405int GetVlogLevelHelper(const char* file, size_t N) { 406#ifdef ANDROID 407 return 0; 408#else 409 DCHECK_GT(N, 0U); 410 return g_vlog_info ? 411 g_vlog_info->GetVlogLevel(base::StringPiece(file, N - 1)) : 412 GetVlogVerbosity(); 413#endif 414} 415 416void SetLogItems(bool enable_process_id, bool enable_thread_id, 417 bool enable_timestamp, bool enable_tickcount) { 418 log_process_id = enable_process_id; 419 log_thread_id = enable_thread_id; 420 log_timestamp = enable_timestamp; 421 log_tickcount = enable_tickcount; 422} 423 424void SetShowErrorDialogs(bool enable_dialogs) { 425 show_error_dialogs = enable_dialogs; 426} 427 428void SetLogAssertHandler(LogAssertHandlerFunction handler) { 429 log_assert_handler = handler; 430} 431 432void SetLogReportHandler(LogReportHandlerFunction handler) { 433 log_report_handler = handler; 434} 435 436void SetLogMessageHandler(LogMessageHandlerFunction handler) { 437 log_message_handler = handler; 438} 439 440LogMessageHandlerFunction GetLogMessageHandler() { 441 return log_message_handler; 442} 443 444// MSVC doesn't like complex extern templates and DLLs. 445#if !defined(COMPILER_MSVC) 446// Explicit instantiations for commonly used comparisons. 447template std::string* MakeCheckOpString<int, int>( 448 const int&, const int&, const char* names); 449template std::string* MakeCheckOpString<unsigned long, unsigned long>( 450 const unsigned long&, const unsigned long&, const char* names); 451template std::string* MakeCheckOpString<unsigned long, unsigned int>( 452 const unsigned long&, const unsigned int&, const char* names); 453template std::string* MakeCheckOpString<unsigned int, unsigned long>( 454 const unsigned int&, const unsigned long&, const char* names); 455template std::string* MakeCheckOpString<std::string, std::string>( 456 const std::string&, const std::string&, const char* name); 457#endif 458 459// Displays a message box to the user with the error message in it. 460// Used for fatal messages, where we close the app simultaneously. 461void DisplayDebugMessageInDialog(const std::string& str) { 462 if (str.empty()) 463 return; 464 465 if (!show_error_dialogs) 466 return; 467 468#if defined(OS_WIN) 469 // For Windows programs, it's possible that the message loop is 470 // messed up on a fatal error, and creating a MessageBox will cause 471 // that message loop to be run. Instead, we try to spawn another 472 // process that displays its command line. We look for "Debug 473 // Message.exe" in the same directory as the application. If it 474 // exists, we use it, otherwise, we use a regular message box. 475 wchar_t prog_name[MAX_PATH]; 476 GetModuleFileNameW(NULL, prog_name, MAX_PATH); 477 wchar_t* backslash = wcsrchr(prog_name, '\\'); 478 if (backslash) 479 backslash[1] = 0; 480 wcscat_s(prog_name, MAX_PATH, L"debug_message.exe"); 481 482 std::wstring cmdline = UTF8ToWide(str); 483 if (cmdline.empty()) 484 return; 485 486 STARTUPINFO startup_info; 487 memset(&startup_info, 0, sizeof(startup_info)); 488 startup_info.cb = sizeof(startup_info); 489 490 PROCESS_INFORMATION process_info; 491 if (CreateProcessW(prog_name, &cmdline[0], NULL, NULL, false, 0, NULL, 492 NULL, &startup_info, &process_info)) { 493 WaitForSingleObject(process_info.hProcess, INFINITE); 494 CloseHandle(process_info.hThread); 495 CloseHandle(process_info.hProcess); 496 } else { 497 // debug process broken, let's just do a message box 498 MessageBoxW(NULL, &cmdline[0], L"Fatal error", 499 MB_OK | MB_ICONHAND | MB_TOPMOST); 500 } 501#elif defined(USE_X11) && !defined(OS_CHROMEOS) 502 // Shell out to xmessage, which behaves like debug_message.exe, but is 503 // way more retro. We could use zenity/kdialog but then we're starting 504 // to get into needing to check the desktop env and this dialog should 505 // only be coming up in Very Bad situations. 506 std::vector<std::string> argv; 507 argv.push_back("xmessage"); 508 argv.push_back(str); 509 base::LaunchApp(argv, base::file_handle_mapping_vector(), true /* wait */, 510 NULL); 511#else 512 // http://code.google.com/p/chromium/issues/detail?id=37026 513 NOTIMPLEMENTED(); 514#endif 515} 516 517#if defined(OS_WIN) 518LogMessage::SaveLastError::SaveLastError() : last_error_(::GetLastError()) { 519} 520 521LogMessage::SaveLastError::~SaveLastError() { 522 ::SetLastError(last_error_); 523} 524#endif // defined(OS_WIN) 525 526LogMessage::LogMessage(const char* file, int line, LogSeverity severity, 527 int ctr) 528 : severity_(severity), file_(file), line_(line) { 529 Init(file, line); 530} 531 532LogMessage::LogMessage(const char* file, int line, const CheckOpString& result) 533 : severity_(LOG_FATAL), file_(file), line_(line) { 534 Init(file, line); 535 stream_ << "Check failed: " << (*result.str_); 536} 537 538LogMessage::LogMessage(const char* file, int line, LogSeverity severity, 539 const CheckOpString& result) 540 : severity_(severity), file_(file), line_(line) { 541 Init(file, line); 542 stream_ << "Check failed: " << (*result.str_); 543} 544 545LogMessage::LogMessage(const char* file, int line) 546 : severity_(LOG_INFO), file_(file), line_(line) { 547 Init(file, line); 548} 549 550LogMessage::LogMessage(const char* file, int line, LogSeverity severity) 551 : severity_(severity), file_(file), line_(line) { 552 Init(file, line); 553} 554 555// writes the common header info to the stream 556void LogMessage::Init(const char* file, int line) { 557 base::StringPiece filename(file); 558 size_t last_slash_pos = filename.find_last_of("\\/"); 559 if (last_slash_pos != base::StringPiece::npos) 560 filename.remove_prefix(last_slash_pos + 1); 561 562 // TODO(darin): It might be nice if the columns were fixed width. 563 564 stream_ << '['; 565 if (log_process_id) 566 stream_ << CurrentProcessId() << ':'; 567 if (log_thread_id) 568 stream_ << CurrentThreadId() << ':'; 569 if (log_timestamp) { 570 time_t t = time(NULL); 571 struct tm local_time = {0}; 572#if _MSC_VER >= 1400 573 localtime_s(&local_time, &t); 574#else 575 localtime_r(&t, &local_time); 576#endif 577 struct tm* tm_time = &local_time; 578 stream_ << std::setfill('0') 579 << std::setw(2) << 1 + tm_time->tm_mon 580 << std::setw(2) << tm_time->tm_mday 581 << '/' 582 << std::setw(2) << tm_time->tm_hour 583 << std::setw(2) << tm_time->tm_min 584 << std::setw(2) << tm_time->tm_sec 585 << ':'; 586 } 587 if (log_tickcount) 588 stream_ << TickCount() << ':'; 589 if (severity_ >= 0) 590 stream_ << log_severity_names[severity_]; 591 else 592 stream_ << "VERBOSE" << -severity_; 593 594 stream_ << ":" << file << "(" << line << ")] "; 595 596 message_start_ = stream_.tellp(); 597} 598 599LogMessage::~LogMessage() { 600 // The macros in logging.h should already avoid creating LogMessages 601 // when this holds, but it's possible that users create LogMessages 602 // directly (e.g., using LOG_STREAM() directly). 603 if (severity_ < min_log_level) 604 return; 605 606#ifndef NDEBUG 607 if (severity_ == LOG_FATAL) { 608 // Include a stack trace on a fatal. 609 base::debug::StackTrace trace; 610 stream_ << std::endl; // Newline to separate from log message. 611 trace.OutputToStream(&stream_); 612 } 613#endif 614 stream_ << std::endl; 615 std::string str_newline(stream_.str()); 616 617 // Give any log message handler first dibs on the message. 618 if (log_message_handler && log_message_handler(severity_, file_, line_, 619 message_start_, str_newline)) { 620 // The handler took care of it, no further processing. 621 return; 622 } 623 624 if (logging_destination == LOG_ONLY_TO_SYSTEM_DEBUG_LOG || 625 logging_destination == LOG_TO_BOTH_FILE_AND_SYSTEM_DEBUG_LOG) { 626#if defined(OS_WIN) 627 OutputDebugStringA(str_newline.c_str()); 628#endif 629 fprintf(stderr, "%s", str_newline.c_str()); 630 fflush(stderr); 631 } else if (severity_ >= kAlwaysPrintErrorLevel) { 632 // When we're only outputting to a log file, above a certain log level, we 633 // should still output to stderr so that we can better detect and diagnose 634 // problems with unit tests, especially on the buildbots. 635 fprintf(stderr, "%s", str_newline.c_str()); 636 fflush(stderr); 637 } 638 639 // We can have multiple threads and/or processes, so try to prevent them 640 // from clobbering each other's writes. 641 // If the client app did not call InitLogging, and the lock has not 642 // been created do it now. We do this on demand, but if two threads try 643 // to do this at the same time, there will be a race condition to create 644 // the lock. This is why InitLogging should be called from the main 645 // thread at the beginning of execution. 646 LoggingLock::Init(LOCK_LOG_FILE, NULL); 647 // write to log file 648 if (logging_destination != LOG_NONE && 649 logging_destination != LOG_ONLY_TO_SYSTEM_DEBUG_LOG) { 650 LoggingLock logging_lock; 651 if (InitializeLogFileHandle()) { 652#if defined(OS_WIN) 653 SetFilePointer(log_file, 0, 0, SEEK_END); 654 DWORD num_written; 655 WriteFile(log_file, 656 static_cast<const void*>(str_newline.c_str()), 657 static_cast<DWORD>(str_newline.length()), 658 &num_written, 659 NULL); 660#else 661 fprintf(log_file, "%s", str_newline.c_str()); 662 fflush(log_file); 663#endif 664 } 665 } 666 667 if (severity_ == LOG_FATAL) { 668 // display a message or break into the debugger on a fatal error 669 if (base::debug::BeingDebugged()) { 670 base::debug::BreakDebugger(); 671 } else { 672 if (log_assert_handler) { 673 // make a copy of the string for the handler out of paranoia 674 log_assert_handler(std::string(stream_.str())); 675 } else { 676 // Don't use the string with the newline, get a fresh version to send to 677 // the debug message process. We also don't display assertions to the 678 // user in release mode. The enduser can't do anything with this 679 // information, and displaying message boxes when the application is 680 // hosed can cause additional problems. 681#ifndef NDEBUG 682 DisplayDebugMessageInDialog(stream_.str()); 683#endif 684 // Crash the process to generate a dump. 685 base::debug::BreakDebugger(); 686 } 687 } 688 } else if (severity_ == LOG_ERROR_REPORT) { 689 // We are here only if the user runs with --enable-dcheck in release mode. 690 if (log_report_handler) { 691 log_report_handler(std::string(stream_.str())); 692 } else { 693 DisplayDebugMessageInDialog(stream_.str()); 694 } 695 } 696} 697 698#if defined(OS_WIN) 699// This has already been defined in the header, but defining it again as DWORD 700// ensures that the type used in the header is equivalent to DWORD. If not, 701// the redefinition is a compile error. 702typedef DWORD SystemErrorCode; 703#endif 704 705SystemErrorCode GetLastSystemErrorCode() { 706#if defined(OS_WIN) 707 return ::GetLastError(); 708#elif defined(OS_POSIX) 709 return errno; 710#else 711#error Not implemented 712#endif 713} 714 715#if defined(OS_WIN) 716Win32ErrorLogMessage::Win32ErrorLogMessage(const char* file, 717 int line, 718 LogSeverity severity, 719 SystemErrorCode err, 720 const char* module) 721 : err_(err), 722 module_(module), 723 log_message_(file, line, severity) { 724} 725 726Win32ErrorLogMessage::Win32ErrorLogMessage(const char* file, 727 int line, 728 LogSeverity severity, 729 SystemErrorCode err) 730 : err_(err), 731 module_(NULL), 732 log_message_(file, line, severity) { 733} 734 735Win32ErrorLogMessage::~Win32ErrorLogMessage() { 736 const int error_message_buffer_size = 256; 737 char msgbuf[error_message_buffer_size]; 738 DWORD flags = FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS; 739 HMODULE hmod; 740 if (module_) { 741 hmod = GetModuleHandleA(module_); 742 if (hmod) { 743 flags |= FORMAT_MESSAGE_FROM_HMODULE; 744 } else { 745 // This makes a nested Win32ErrorLogMessage. It will have module_ of NULL 746 // so it will not call GetModuleHandle, so recursive errors are 747 // impossible. 748 DPLOG(WARNING) << "Couldn't open module " << module_ 749 << " for error message query"; 750 } 751 } else { 752 hmod = NULL; 753 } 754 DWORD len = FormatMessageA(flags, 755 hmod, 756 err_, 757 0, 758 msgbuf, 759 sizeof(msgbuf) / sizeof(msgbuf[0]), 760 NULL); 761 if (len) { 762 while ((len > 0) && 763 isspace(static_cast<unsigned char>(msgbuf[len - 1]))) { 764 msgbuf[--len] = 0; 765 } 766 stream() << ": " << msgbuf; 767 } else { 768 stream() << ": Error " << GetLastError() << " while retrieving error " 769 << err_; 770 } 771} 772#elif defined(OS_POSIX) 773ErrnoLogMessage::ErrnoLogMessage(const char* file, 774 int line, 775 LogSeverity severity, 776 SystemErrorCode err) 777 : err_(err), 778 log_message_(file, line, severity) { 779} 780 781ErrnoLogMessage::~ErrnoLogMessage() { 782 stream() << ": " << safe_strerror(err_); 783} 784#endif // OS_WIN 785 786void CloseLogFile() { 787 LoggingLock logging_lock; 788 789 if (!log_file) 790 return; 791 792 CloseFile(log_file); 793 log_file = NULL; 794} 795 796void RawLog(int level, const char* message) { 797 if (level >= min_log_level) { 798 size_t bytes_written = 0; 799 const size_t message_len = strlen(message); 800 int rv; 801 while (bytes_written < message_len) { 802 rv = HANDLE_EINTR( 803 write(STDERR_FILENO, message + bytes_written, 804 message_len - bytes_written)); 805 if (rv < 0) { 806 // Give up, nothing we can do now. 807 break; 808 } 809 bytes_written += rv; 810 } 811 812 if (message_len > 0 && message[message_len - 1] != '\n') { 813 do { 814 rv = HANDLE_EINTR(write(STDERR_FILENO, "\n", 1)); 815 if (rv < 0) { 816 // Give up, nothing we can do now. 817 break; 818 } 819 } while (rv != 1); 820 } 821 } 822 823 if (level == LOG_FATAL) 824 base::debug::BreakDebugger(); 825} 826 827} // namespace logging 828 829std::ostream& operator<<(std::ostream& out, const wchar_t* wstr) { 830 return out << WideToUTF8(std::wstring(wstr)); 831} 832