logging.cc revision 10a271fde41d76b98e66b4394f9bee383be5a1da
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#if defined(OS_NACL) 23#include <sys/nacl_syscalls.h> 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 <stdlib.h> 35#include <stdio.h> 36#include <string.h> 37#include <unistd.h> 38#define MAX_PATH PATH_MAX 39typedef FILE* FileHandle; 40typedef pthread_mutex_t* MutexHandle; 41#endif 42 43#include <ctime> 44#include <iomanip> 45#include <cstring> 46#include <algorithm> 47 48#include "base/base_switches.h" 49#include "base/command_line.h" 50#include "base/debug/debugger.h" 51#include "base/debug/stack_trace.h" 52#include "base/eintr_wrapper.h" 53#include "base/string_piece.h" 54#include "base/synchronization/lock_impl.h" 55#include "base/utf_string_conversions.h" 56#include "base/vlog.h" 57#if defined(OS_POSIX) 58#include "base/safe_strerror_posix.h" 59#endif 60#if defined(OS_MACOSX) 61#include "base/mac/scoped_cftyperef.h" 62#include "base/sys_string_conversions.h" 63#endif 64 65namespace logging { 66 67DcheckState g_dcheck_state = DISABLE_DCHECK_FOR_NON_OFFICIAL_RELEASE_BUILDS; 68VlogInfo* g_vlog_info = NULL; 69 70const char* const log_severity_names[LOG_NUM_SEVERITIES] = { 71 "INFO", "WARNING", "ERROR", "ERROR_REPORT", "FATAL" }; 72 73int min_log_level = 0; 74 75// The default set here for logging_destination will only be used if 76// InitLogging is not called. On Windows, use a file next to the exe; 77// on POSIX platforms, where it may not even be possible to locate the 78// executable on disk, use stderr. 79#if defined(OS_WIN) 80LoggingDestination logging_destination = LOG_ONLY_TO_FILE; 81#elif defined(OS_POSIX) 82LoggingDestination logging_destination = LOG_ONLY_TO_SYSTEM_DEBUG_LOG; 83#endif 84 85// For LOG_ERROR and above, always print to stderr. 86const int kAlwaysPrintErrorLevel = LOG_ERROR; 87 88// Which log file to use? This is initialized by InitLogging or 89// will be lazily initialized to the default value when it is 90// first needed. 91#if defined(OS_WIN) 92typedef std::wstring PathString; 93#else 94typedef std::string PathString; 95#endif 96PathString* log_file_name = NULL; 97 98// this file is lazily opened and the handle may be NULL 99FileHandle log_file = NULL; 100 101// what should be prepended to each message? 102bool log_process_id = false; 103bool log_thread_id = false; 104bool log_timestamp = true; 105bool log_tickcount = false; 106 107// Should we pop up fatal debug messages in a dialog? 108bool show_error_dialogs = false; 109 110// An assert handler override specified by the client to be called instead of 111// the debug message dialog and process termination. 112LogAssertHandlerFunction log_assert_handler = NULL; 113// An report handler override specified by the client to be called instead of 114// the debug message dialog. 115LogReportHandlerFunction log_report_handler = NULL; 116// A log message handler that gets notified of every log message we process. 117LogMessageHandlerFunction log_message_handler = NULL; 118 119// Helper functions to wrap platform differences. 120 121int32 CurrentProcessId() { 122#if defined(OS_WIN) 123 return GetCurrentProcessId(); 124#elif defined(OS_POSIX) 125 return getpid(); 126#endif 127} 128 129int32 CurrentThreadId() { 130#if defined(OS_WIN) 131 return GetCurrentThreadId(); 132#elif defined(OS_MACOSX) 133 return mach_thread_self(); 134#elif defined(OS_LINUX) 135 return syscall(__NR_gettid); 136#elif defined(OS_FREEBSD) 137 // TODO(BSD): find a better thread ID 138 return reinterpret_cast<int64>(pthread_self()); 139#elif defined(OS_NACL) 140 return pthread_self(); 141#endif 142} 143 144uint64 TickCount() { 145#if defined(OS_WIN) 146 return GetTickCount(); 147#elif defined(OS_MACOSX) 148 return mach_absolute_time(); 149#elif defined(OS_NACL) 150 // NaCl sadly does not have _POSIX_TIMERS enabled in sys/features.h 151 // So we have to use clock() for now. 152 return clock(); 153#elif defined(OS_POSIX) 154 struct timespec ts; 155 clock_gettime(CLOCK_MONOTONIC, &ts); 156 157 uint64 absolute_micro = 158 static_cast<int64>(ts.tv_sec) * 1000000 + 159 static_cast<int64>(ts.tv_nsec) / 1000; 160 161 return absolute_micro; 162#endif 163} 164 165void CloseFile(FileHandle log) { 166#if defined(OS_WIN) 167 CloseHandle(log); 168#else 169 fclose(log); 170#endif 171} 172 173void DeleteFilePath(const PathString& log_name) { 174#if defined(OS_WIN) 175 DeleteFile(log_name.c_str()); 176#else 177 unlink(log_name.c_str()); 178#endif 179} 180 181PathString GetDefaultLogFile() { 182#if defined(OS_WIN) 183 // On Windows we use the same path as the exe. 184 wchar_t module_name[MAX_PATH]; 185 GetModuleFileName(NULL, module_name, MAX_PATH); 186 187 PathString log_file = module_name; 188 PathString::size_type last_backslash = 189 log_file.rfind('\\', log_file.size()); 190 if (last_backslash != PathString::npos) 191 log_file.erase(last_backslash + 1); 192 log_file += L"debug.log"; 193 return log_file; 194#elif defined(OS_POSIX) 195 // On other platforms we just use the current directory. 196 return PathString("debug.log"); 197#endif 198} 199 200// This class acts as a wrapper for locking the logging files. 201// LoggingLock::Init() should be called from the main thread before any logging 202// is done. Then whenever logging, be sure to have a local LoggingLock 203// instance on the stack. This will ensure that the lock is unlocked upon 204// exiting the frame. 205// LoggingLocks can not be nested. 206class LoggingLock { 207 public: 208 LoggingLock() { 209 LockLogging(); 210 } 211 212 ~LoggingLock() { 213 UnlockLogging(); 214 } 215 216 static void Init(LogLockingState lock_log, const PathChar* new_log_file) { 217 if (initialized) 218 return; 219 lock_log_file = lock_log; 220 if (lock_log_file == LOCK_LOG_FILE) { 221#if defined(OS_WIN) 222 if (!log_mutex) { 223 std::wstring safe_name; 224 if (new_log_file) 225 safe_name = new_log_file; 226 else 227 safe_name = GetDefaultLogFile(); 228 // \ is not a legal character in mutex names so we replace \ with / 229 std::replace(safe_name.begin(), safe_name.end(), '\\', '/'); 230 std::wstring t(L"Global\\"); 231 t.append(safe_name); 232 log_mutex = ::CreateMutex(NULL, FALSE, t.c_str()); 233 234 if (log_mutex == NULL) { 235#if DEBUG 236 // Keep the error code for debugging 237 int error = GetLastError(); // NOLINT 238 base::debug::BreakDebugger(); 239#endif 240 // Return nicely without putting initialized to true. 241 return; 242 } 243 } 244#endif 245 } else { 246 log_lock = new base::internal::LockImpl(); 247 } 248 initialized = true; 249 } 250 251 private: 252 static void LockLogging() { 253 if (lock_log_file == LOCK_LOG_FILE) { 254#if defined(OS_WIN) 255 ::WaitForSingleObject(log_mutex, INFINITE); 256 // WaitForSingleObject could have returned WAIT_ABANDONED. We don't 257 // abort the process here. UI tests might be crashy sometimes, 258 // and aborting the test binary only makes the problem worse. 259 // We also don't use LOG macros because that might lead to an infinite 260 // loop. For more info see http://crbug.com/18028. 261#elif defined(OS_POSIX) 262 pthread_mutex_lock(&log_mutex); 263#endif 264 } else { 265 // use the lock 266 log_lock->Lock(); 267 } 268 } 269 270 static void UnlockLogging() { 271 if (lock_log_file == LOCK_LOG_FILE) { 272#if defined(OS_WIN) 273 ReleaseMutex(log_mutex); 274#elif defined(OS_POSIX) 275 pthread_mutex_unlock(&log_mutex); 276#endif 277 } else { 278 log_lock->Unlock(); 279 } 280 } 281 282 // The lock is used if log file locking is false. It helps us avoid problems 283 // with multiple threads writing to the log file at the same time. Use 284 // LockImpl directly instead of using Lock, because Lock makes logging calls. 285 static base::internal::LockImpl* log_lock; 286 287 // When we don't use a lock, we are using a global mutex. We need to do this 288 // because LockFileEx is not thread safe. 289#if defined(OS_WIN) 290 static MutexHandle log_mutex; 291#elif defined(OS_POSIX) 292 static pthread_mutex_t log_mutex; 293#endif 294 295 static bool initialized; 296 static LogLockingState lock_log_file; 297}; 298 299// static 300bool LoggingLock::initialized = false; 301// static 302base::internal::LockImpl* LoggingLock::log_lock = NULL; 303// static 304LogLockingState LoggingLock::lock_log_file = LOCK_LOG_FILE; 305 306#if defined(OS_WIN) 307// static 308MutexHandle LoggingLock::log_mutex = NULL; 309#elif defined(OS_POSIX) 310pthread_mutex_t LoggingLock::log_mutex = PTHREAD_MUTEX_INITIALIZER; 311#endif 312 313// Called by logging functions to ensure that debug_file is initialized 314// and can be used for writing. Returns false if the file could not be 315// initialized. debug_file will be NULL in this case. 316bool InitializeLogFileHandle() { 317 if (log_file) 318 return true; 319 320 if (!log_file_name) { 321 // Nobody has called InitLogging to specify a debug log file, so here we 322 // initialize the log file name to a default. 323 log_file_name = new PathString(GetDefaultLogFile()); 324 } 325 326 if (logging_destination == LOG_ONLY_TO_FILE || 327 logging_destination == LOG_TO_BOTH_FILE_AND_SYSTEM_DEBUG_LOG) { 328#if defined(OS_WIN) 329 log_file = CreateFile(log_file_name->c_str(), GENERIC_WRITE, 330 FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, 331 OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL); 332 if (log_file == INVALID_HANDLE_VALUE || log_file == NULL) { 333 // try the current directory 334 log_file = CreateFile(L".\\debug.log", GENERIC_WRITE, 335 FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, 336 OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL); 337 if (log_file == INVALID_HANDLE_VALUE || log_file == NULL) { 338 log_file = NULL; 339 return false; 340 } 341 } 342 SetFilePointer(log_file, 0, 0, FILE_END); 343#elif defined(OS_POSIX) 344 log_file = fopen(log_file_name->c_str(), "a"); 345 if (log_file == NULL) 346 return false; 347#endif 348 } 349 350 return true; 351} 352 353bool BaseInitLoggingImpl(const PathChar* new_log_file, 354 LoggingDestination logging_dest, 355 LogLockingState lock_log, 356 OldFileDeletionState delete_old, 357 DcheckState dcheck_state) { 358#ifdef ANDROID 359 // ifdef is here because we don't support parsing command line parameters 360 g_dcheck_state = dcheck_state; 361 g_vlog_info = NULL; 362#else 363 CommandLine* command_line = CommandLine::ForCurrentProcess(); 364 g_dcheck_state = dcheck_state; 365 delete g_vlog_info; 366 g_vlog_info = NULL; 367 // Don't bother initializing g_vlog_info unless we use one of the 368 // vlog switches. 369 if (command_line->HasSwitch(switches::kV) || 370 command_line->HasSwitch(switches::kVModule)) { 371 g_vlog_info = 372 new VlogInfo(command_line->GetSwitchValueASCII(switches::kV), 373 command_line->GetSwitchValueASCII(switches::kVModule), 374 &min_log_level); 375 } 376#endif 377 378 LoggingLock::Init(lock_log, new_log_file); 379 380 LoggingLock logging_lock; 381 382 if (log_file) { 383 // calling InitLogging twice or after some log call has already opened the 384 // default log file will re-initialize to the new options 385 CloseFile(log_file); 386 log_file = NULL; 387 } 388 389 logging_destination = logging_dest; 390 391 // ignore file options if logging is disabled or only to system 392 if (logging_destination == LOG_NONE || 393 logging_destination == LOG_ONLY_TO_SYSTEM_DEBUG_LOG) 394 return true; 395 396 if (!log_file_name) 397 log_file_name = new PathString(); 398 *log_file_name = new_log_file; 399 if (delete_old == DELETE_OLD_LOG_FILE) 400 DeleteFilePath(*log_file_name); 401 402 return InitializeLogFileHandle(); 403} 404 405void SetMinLogLevel(int level) { 406 min_log_level = std::min(LOG_ERROR_REPORT, level); 407} 408 409int GetMinLogLevel() { 410 return min_log_level; 411} 412 413int GetVlogVerbosity() { 414 return std::max(-1, LOG_INFO - GetMinLogLevel()); 415} 416 417int GetVlogLevelHelper(const char* file, size_t N) { 418 DCHECK_GT(N, 0U); 419 return g_vlog_info ? 420 g_vlog_info->GetVlogLevel(base::StringPiece(file, N - 1)) : 421 GetVlogVerbosity(); 422} 423 424void SetLogItems(bool enable_process_id, bool enable_thread_id, 425 bool enable_timestamp, bool enable_tickcount) { 426 log_process_id = enable_process_id; 427 log_thread_id = enable_thread_id; 428 log_timestamp = enable_timestamp; 429 log_tickcount = enable_tickcount; 430} 431 432void SetShowErrorDialogs(bool enable_dialogs) { 433 show_error_dialogs = enable_dialogs; 434} 435 436void SetLogAssertHandler(LogAssertHandlerFunction handler) { 437 log_assert_handler = handler; 438} 439 440void SetLogReportHandler(LogReportHandlerFunction handler) { 441 log_report_handler = handler; 442} 443 444void SetLogMessageHandler(LogMessageHandlerFunction handler) { 445 log_message_handler = handler; 446} 447 448LogMessageHandlerFunction GetLogMessageHandler() { 449 return log_message_handler; 450} 451 452// MSVC doesn't like complex extern templates and DLLs. 453#if !defined(COMPILER_MSVC) 454// Explicit instantiations for commonly used comparisons. 455template std::string* MakeCheckOpString<int, int>( 456 const int&, const int&, const char* names); 457template std::string* MakeCheckOpString<unsigned long, unsigned long>( 458 const unsigned long&, const unsigned long&, const char* names); 459template std::string* MakeCheckOpString<unsigned long, unsigned int>( 460 const unsigned long&, const unsigned int&, const char* names); 461template std::string* MakeCheckOpString<unsigned int, unsigned long>( 462 const unsigned int&, const unsigned long&, const char* names); 463template std::string* MakeCheckOpString<std::string, std::string>( 464 const std::string&, const std::string&, const char* name); 465#endif 466 467// Displays a message box to the user with the error message in it. 468// Used for fatal messages, where we close the app simultaneously. 469// This is for developers only; we don't use this in circumstances 470// (like release builds) where users could see it, since users don't 471// understand these messages anyway. 472void DisplayDebugMessageInDialog(const std::string& str) { 473 if (str.empty()) 474 return; 475 476 if (!show_error_dialogs) 477 return; 478 479#if defined(OS_WIN) 480 // For Windows programs, it's possible that the message loop is 481 // messed up on a fatal error, and creating a MessageBox will cause 482 // that message loop to be run. Instead, we try to spawn another 483 // process that displays its command line. We look for "Debug 484 // Message.exe" in the same directory as the application. If it 485 // exists, we use it, otherwise, we use a regular message box. 486 wchar_t prog_name[MAX_PATH]; 487 GetModuleFileNameW(NULL, prog_name, MAX_PATH); 488 wchar_t* backslash = wcsrchr(prog_name, '\\'); 489 if (backslash) 490 backslash[1] = 0; 491 wcscat_s(prog_name, MAX_PATH, L"debug_message.exe"); 492 493 std::wstring cmdline = UTF8ToWide(str); 494 if (cmdline.empty()) 495 return; 496 497 STARTUPINFO startup_info; 498 memset(&startup_info, 0, sizeof(startup_info)); 499 startup_info.cb = sizeof(startup_info); 500 501 PROCESS_INFORMATION process_info; 502 if (CreateProcessW(prog_name, &cmdline[0], NULL, NULL, false, 0, NULL, 503 NULL, &startup_info, &process_info)) { 504 WaitForSingleObject(process_info.hProcess, INFINITE); 505 CloseHandle(process_info.hThread); 506 CloseHandle(process_info.hProcess); 507 } else { 508 // debug process broken, let's just do a message box 509 MessageBoxW(NULL, &cmdline[0], L"Fatal error", 510 MB_OK | MB_ICONHAND | MB_TOPMOST); 511 } 512#elif defined(OS_MACOSX) 513 base::mac::ScopedCFTypeRef<CFStringRef> message( 514 base::SysUTF8ToCFStringRef(str)); 515 CFUserNotificationDisplayNotice(0, kCFUserNotificationStopAlertLevel, 516 NULL, NULL, NULL, CFSTR("Fatal Error"), 517 message, NULL); 518#else 519 // We intentionally don't implement a dialog on other platforms. 520 // You can just look at stderr. 521#endif 522} 523 524#if defined(OS_WIN) 525LogMessage::SaveLastError::SaveLastError() : last_error_(::GetLastError()) { 526} 527 528LogMessage::SaveLastError::~SaveLastError() { 529 ::SetLastError(last_error_); 530} 531#endif // defined(OS_WIN) 532 533LogMessage::LogMessage(const char* file, int line, LogSeverity severity, 534 int ctr) 535 : severity_(severity), file_(file), line_(line) { 536 Init(file, line); 537} 538 539LogMessage::LogMessage(const char* file, int line) 540 : severity_(LOG_INFO), file_(file), line_(line) { 541 Init(file, line); 542} 543 544LogMessage::LogMessage(const char* file, int line, LogSeverity severity) 545 : severity_(severity), file_(file), line_(line) { 546 Init(file, line); 547} 548 549LogMessage::LogMessage(const char* file, int line, std::string* result) 550 : severity_(LOG_FATAL), file_(file), line_(line) { 551 Init(file, line); 552 stream_ << "Check failed: " << *result; 553 delete result; 554} 555 556LogMessage::LogMessage(const char* file, int line, LogSeverity severity, 557 std::string* result) 558 : severity_(severity), file_(file), line_(line) { 559 Init(file, line); 560 stream_ << "Check failed: " << *result; 561 delete result; 562} 563 564LogMessage::~LogMessage() { 565#ifndef NDEBUG 566 if (severity_ == LOG_FATAL) { 567 // Include a stack trace on a fatal. 568 base::debug::StackTrace trace; 569 stream_ << std::endl; // Newline to separate from log message. 570 trace.OutputToStream(&stream_); 571 } 572#endif 573 stream_ << std::endl; 574 std::string str_newline(stream_.str()); 575 576 // Give any log message handler first dibs on the message. 577 if (log_message_handler && log_message_handler(severity_, file_, line_, 578 message_start_, str_newline)) { 579 // The handler took care of it, no further processing. 580 return; 581 } 582 583 if (logging_destination == LOG_ONLY_TO_SYSTEM_DEBUG_LOG || 584 logging_destination == LOG_TO_BOTH_FILE_AND_SYSTEM_DEBUG_LOG) { 585#if defined(OS_WIN) 586 OutputDebugStringA(str_newline.c_str()); 587#endif 588 fprintf(stderr, "%s", str_newline.c_str()); 589 fflush(stderr); 590 } else if (severity_ >= kAlwaysPrintErrorLevel) { 591 // When we're only outputting to a log file, above a certain log level, we 592 // should still output to stderr so that we can better detect and diagnose 593 // problems with unit tests, especially on the buildbots. 594 fprintf(stderr, "%s", str_newline.c_str()); 595 fflush(stderr); 596 } 597 598 // We can have multiple threads and/or processes, so try to prevent them 599 // from clobbering each other's writes. 600 // If the client app did not call InitLogging, and the lock has not 601 // been created do it now. We do this on demand, but if two threads try 602 // to do this at the same time, there will be a race condition to create 603 // the lock. This is why InitLogging should be called from the main 604 // thread at the beginning of execution. 605 LoggingLock::Init(LOCK_LOG_FILE, NULL); 606 // write to log file 607 if (logging_destination != LOG_NONE && 608 logging_destination != LOG_ONLY_TO_SYSTEM_DEBUG_LOG) { 609 LoggingLock logging_lock; 610 if (InitializeLogFileHandle()) { 611#if defined(OS_WIN) 612 SetFilePointer(log_file, 0, 0, SEEK_END); 613 DWORD num_written; 614 WriteFile(log_file, 615 static_cast<const void*>(str_newline.c_str()), 616 static_cast<DWORD>(str_newline.length()), 617 &num_written, 618 NULL); 619#else 620 fprintf(log_file, "%s", str_newline.c_str()); 621 fflush(log_file); 622#endif 623 } 624 } 625 626 if (severity_ == LOG_FATAL) { 627 // display a message or break into the debugger on a fatal error 628 if (base::debug::BeingDebugged()) { 629 base::debug::BreakDebugger(); 630 } else { 631 if (log_assert_handler) { 632 // make a copy of the string for the handler out of paranoia 633 log_assert_handler(std::string(stream_.str())); 634 } else { 635 // Don't use the string with the newline, get a fresh version to send to 636 // the debug message process. We also don't display assertions to the 637 // user in release mode. The enduser can't do anything with this 638 // information, and displaying message boxes when the application is 639 // hosed can cause additional problems. 640#ifndef NDEBUG 641 DisplayDebugMessageInDialog(stream_.str()); 642#endif 643 // Crash the process to generate a dump. 644 base::debug::BreakDebugger(); 645 } 646 } 647 } else if (severity_ == LOG_ERROR_REPORT) { 648 // We are here only if the user runs with --enable-dcheck in release mode. 649 if (log_report_handler) { 650 log_report_handler(std::string(stream_.str())); 651 } else { 652 DisplayDebugMessageInDialog(stream_.str()); 653 } 654 } 655} 656 657// writes the common header info to the stream 658void LogMessage::Init(const char* file, int line) { 659 base::StringPiece filename(file); 660 size_t last_slash_pos = filename.find_last_of("\\/"); 661 if (last_slash_pos != base::StringPiece::npos) 662 filename.remove_prefix(last_slash_pos + 1); 663 664 // TODO(darin): It might be nice if the columns were fixed width. 665 666 stream_ << '['; 667 if (log_process_id) 668 stream_ << CurrentProcessId() << ':'; 669 if (log_thread_id) 670 stream_ << CurrentThreadId() << ':'; 671 if (log_timestamp) { 672 time_t t = time(NULL); 673 struct tm local_time = {0}; 674#if _MSC_VER >= 1400 675 localtime_s(&local_time, &t); 676#else 677 localtime_r(&t, &local_time); 678#endif 679 struct tm* tm_time = &local_time; 680 stream_ << std::setfill('0') 681 << std::setw(2) << 1 + tm_time->tm_mon 682 << std::setw(2) << tm_time->tm_mday 683 << '/' 684 << std::setw(2) << tm_time->tm_hour 685 << std::setw(2) << tm_time->tm_min 686 << std::setw(2) << tm_time->tm_sec 687 << ':'; 688 } 689 if (log_tickcount) 690 stream_ << TickCount() << ':'; 691 if (severity_ >= 0) 692 stream_ << log_severity_names[severity_]; 693 else 694 stream_ << "VERBOSE" << -severity_; 695 696 stream_ << ":" << filename << "(" << line << ")] "; 697 698 message_start_ = stream_.tellp(); 699} 700 701#if defined(OS_WIN) 702// This has already been defined in the header, but defining it again as DWORD 703// ensures that the type used in the header is equivalent to DWORD. If not, 704// the redefinition is a compile error. 705typedef DWORD SystemErrorCode; 706#endif 707 708SystemErrorCode GetLastSystemErrorCode() { 709#if defined(OS_WIN) 710 return ::GetLastError(); 711#elif defined(OS_POSIX) 712 return errno; 713#else 714#error Not implemented 715#endif 716} 717 718#if defined(OS_WIN) 719Win32ErrorLogMessage::Win32ErrorLogMessage(const char* file, 720 int line, 721 LogSeverity severity, 722 SystemErrorCode err, 723 const char* module) 724 : err_(err), 725 module_(module), 726 log_message_(file, line, severity) { 727} 728 729Win32ErrorLogMessage::Win32ErrorLogMessage(const char* file, 730 int line, 731 LogSeverity severity, 732 SystemErrorCode err) 733 : err_(err), 734 module_(NULL), 735 log_message_(file, line, severity) { 736} 737 738Win32ErrorLogMessage::~Win32ErrorLogMessage() { 739 const int error_message_buffer_size = 256; 740 char msgbuf[error_message_buffer_size]; 741 DWORD flags = FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS; 742 HMODULE hmod; 743 if (module_) { 744 hmod = GetModuleHandleA(module_); 745 if (hmod) { 746 flags |= FORMAT_MESSAGE_FROM_HMODULE; 747 } else { 748 // This makes a nested Win32ErrorLogMessage. It will have module_ of NULL 749 // so it will not call GetModuleHandle, so recursive errors are 750 // impossible. 751 DPLOG(WARNING) << "Couldn't open module " << module_ 752 << " for error message query"; 753 } 754 } else { 755 hmod = NULL; 756 } 757 DWORD len = FormatMessageA(flags, 758 hmod, 759 err_, 760 0, 761 msgbuf, 762 sizeof(msgbuf) / sizeof(msgbuf[0]), 763 NULL); 764 if (len) { 765 while ((len > 0) && 766 isspace(static_cast<unsigned char>(msgbuf[len - 1]))) { 767 msgbuf[--len] = 0; 768 } 769 stream() << ": " << msgbuf; 770 } else { 771 stream() << ": Error " << GetLastError() << " while retrieving error " 772 << err_; 773 } 774} 775#elif defined(OS_POSIX) 776ErrnoLogMessage::ErrnoLogMessage(const char* file, 777 int line, 778 LogSeverity severity, 779 SystemErrorCode err) 780 : err_(err), 781 log_message_(file, line, severity) { 782} 783 784ErrnoLogMessage::~ErrnoLogMessage() { 785 stream() << ": " << safe_strerror(err_); 786} 787#endif // OS_WIN 788 789void CloseLogFile() { 790 LoggingLock logging_lock; 791 792 if (!log_file) 793 return; 794 795 CloseFile(log_file); 796 log_file = NULL; 797} 798 799void RawLog(int level, const char* message) { 800 if (level >= min_log_level) { 801 size_t bytes_written = 0; 802 const size_t message_len = strlen(message); 803 int rv; 804 while (bytes_written < message_len) { 805 rv = HANDLE_EINTR( 806 write(STDERR_FILENO, message + bytes_written, 807 message_len - bytes_written)); 808 if (rv < 0) { 809 // Give up, nothing we can do now. 810 break; 811 } 812 bytes_written += rv; 813 } 814 815 if (message_len > 0 && message[message_len - 1] != '\n') { 816 do { 817 rv = HANDLE_EINTR(write(STDERR_FILENO, "\n", 1)); 818 if (rv < 0) { 819 // Give up, nothing we can do now. 820 break; 821 } 822 } while (rv != 1); 823 } 824 } 825 826 if (level == LOG_FATAL) 827 base::debug::BreakDebugger(); 828} 829 830} // namespace logging 831 832std::ostream& operator<<(std::ostream& out, const wchar_t* wstr) { 833 return out << WideToUTF8(std::wstring(wstr)); 834} 835