logging.cc revision dc0f95d653279beabeb9817299e2902918ba123e 
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 <mach/mach.h>
18#include <mach/mach_time.h>
19#include <mach-o/dyld.h>
20#elif defined(OS_POSIX)
21#if defined(OS_NACL)
22#include <sys/nacl_syscalls.h>
23#include <sys/time.h> // timespec doesn't seem to be in <time.h>
24#else
25#include <sys/syscall.h>
26#endif
27#include <time.h>
28#endif
29
30#if defined(OS_POSIX)
31#include <errno.h>
32#include <pthread.h>
33#include <stdlib.h>
34#include <stdio.h>
35#include <string.h>
36#include <unistd.h>
37#define MAX_PATH PATH_MAX
38typedef FILE* FileHandle;
39typedef pthread_mutex_t* MutexHandle;
40#endif
41
42#include <ctime>
43#include <iomanip>
44#include <cstring>
45#include <algorithm>
46
47#include "base/base_switches.h"
48#include "base/command_line.h"
49#include "base/debug/debugger.h"
50#include "base/debug/stack_trace.h"
51#include "base/eintr_wrapper.h"
52#include "base/string_piece.h"
53#include "base/synchronization/lock_impl.h"
54#include "base/utf_string_conversions.h"
55#include "base/vlog.h"
56#if defined(OS_POSIX)
57#include "base/safe_strerror_posix.h"
58#endif
59
60namespace logging {
61
62DcheckState g_dcheck_state = DISABLE_DCHECK_FOR_NON_OFFICIAL_RELEASE_BUILDS;
63VlogInfo* g_vlog_info = NULL;
64
65const char* const log_severity_names[LOG_NUM_SEVERITIES] = {
66  "INFO", "WARNING", "ERROR", "ERROR_REPORT", "FATAL" };
67
68int min_log_level = 0;
69
70// The default set here for logging_destination will only be used if
71// InitLogging is not called.  On Windows, use a file next to the exe;
72// on POSIX platforms, where it may not even be possible to locate the
73// executable on disk, use stderr.
74#if defined(OS_WIN)
75LoggingDestination logging_destination = LOG_ONLY_TO_FILE;
76#elif defined(OS_POSIX)
77LoggingDestination logging_destination = LOG_ONLY_TO_SYSTEM_DEBUG_LOG;
78#endif
79
80// For LOG_ERROR and above, always print to stderr.
81const int kAlwaysPrintErrorLevel = LOG_ERROR;
82
83// Which log file to use? This is initialized by InitLogging or
84// will be lazily initialized to the default value when it is
85// first needed.
86#if defined(OS_WIN)
87typedef std::wstring PathString;
88#else
89typedef std::string PathString;
90#endif
91PathString* log_file_name = NULL;
92
93// this file is lazily opened and the handle may be NULL
94FileHandle log_file = NULL;
95
96// what should be prepended to each message?
97bool log_process_id = false;
98bool log_thread_id = false;
99bool log_timestamp = true;
100bool log_tickcount = false;
101
102// Should we pop up fatal debug messages in a dialog?
103bool show_error_dialogs = false;
104
105// An assert handler override specified by the client to be called instead of
106// the debug message dialog and process termination.
107LogAssertHandlerFunction log_assert_handler = NULL;
108// An report handler override specified by the client to be called instead of
109// the debug message dialog.
110LogReportHandlerFunction log_report_handler = NULL;
111// A log message handler that gets notified of every log message we process.
112LogMessageHandlerFunction log_message_handler = NULL;
113
114// Helper functions to wrap platform differences.
115
116int32 CurrentProcessId() {
117#if defined(OS_WIN)
118  return GetCurrentProcessId();
119#elif defined(OS_POSIX)
120  return getpid();
121#endif
122}
123
124int32 CurrentThreadId() {
125#if defined(OS_WIN)
126  return GetCurrentThreadId();
127#elif defined(OS_MACOSX)
128  return mach_thread_self();
129#elif defined(OS_LINUX)
130  return syscall(__NR_gettid);
131#elif defined(OS_FREEBSD)
132  // TODO(BSD): find a better thread ID
133  return reinterpret_cast<int64>(pthread_self());
134#elif defined(OS_NACL)
135  return pthread_self();
136#endif
137}
138
139uint64 TickCount() {
140#if defined(OS_WIN)
141  return GetTickCount();
142#elif defined(OS_MACOSX)
143  return mach_absolute_time();
144#elif defined(OS_NACL)
145  // NaCl sadly does not have _POSIX_TIMERS enabled in sys/features.h
146  // So we have to use clock() for now.
147  return clock();
148#elif defined(OS_POSIX)
149  struct timespec ts;
150  clock_gettime(CLOCK_MONOTONIC, &ts);
151
152  uint64 absolute_micro =
153    static_cast<int64>(ts.tv_sec) * 1000000 +
154    static_cast<int64>(ts.tv_nsec) / 1000;
155
156  return absolute_micro;
157#endif
158}
159
160void CloseFile(FileHandle log) {
161#if defined(OS_WIN)
162  CloseHandle(log);
163#else
164  fclose(log);
165#endif
166}
167
168void DeleteFilePath(const PathString& log_name) {
169#if defined(OS_WIN)
170  DeleteFile(log_name.c_str());
171#else
172  unlink(log_name.c_str());
173#endif
174}
175
176PathString GetDefaultLogFile() {
177#if defined(OS_WIN)
178  // On Windows we use the same path as the exe.
179  wchar_t module_name[MAX_PATH];
180  GetModuleFileName(NULL, module_name, MAX_PATH);
181
182  PathString log_file = module_name;
183  PathString::size_type last_backslash =
184      log_file.rfind('\\', log_file.size());
185  if (last_backslash != PathString::npos)
186    log_file.erase(last_backslash + 1);
187  log_file += L"debug.log";
188  return log_file;
189#elif defined(OS_POSIX)
190  // On other platforms we just use the current directory.
191  return PathString("debug.log");
192#endif
193}
194
195// This class acts as a wrapper for locking the logging files.
196// LoggingLock::Init() should be called from the main thread before any logging
197// is done. Then whenever logging, be sure to have a local LoggingLock
198// instance on the stack. This will ensure that the lock is unlocked upon
199// exiting the frame.
200// LoggingLocks can not be nested.
201class LoggingLock {
202 public:
203  LoggingLock() {
204    LockLogging();
205  }
206
207  ~LoggingLock() {
208    UnlockLogging();
209  }
210
211  static void Init(LogLockingState lock_log, const PathChar* new_log_file) {
212    if (initialized)
213      return;
214    lock_log_file = lock_log;
215    if (lock_log_file == LOCK_LOG_FILE) {
216#if defined(OS_WIN)
217      if (!log_mutex) {
218        std::wstring safe_name;
219        if (new_log_file)
220          safe_name = new_log_file;
221        else
222          safe_name = GetDefaultLogFile();
223        // \ is not a legal character in mutex names so we replace \ with /
224        std::replace(safe_name.begin(), safe_name.end(), '\\', '/');
225        std::wstring t(L"Global\\");
226        t.append(safe_name);
227        log_mutex = ::CreateMutex(NULL, FALSE, t.c_str());
228
229        if (log_mutex == NULL) {
230#if DEBUG
231          // Keep the error code for debugging
232          int error = GetLastError();  // NOLINT
233          base::debug::BreakDebugger();
234#endif
235          // Return nicely without putting initialized to true.
236          return;
237        }
238      }
239#endif
240    } else {
241      log_lock = new base::internal::LockImpl();
242    }
243    initialized = true;
244  }
245
246 private:
247  static void LockLogging() {
248    if (lock_log_file == LOCK_LOG_FILE) {
249#if defined(OS_WIN)
250      ::WaitForSingleObject(log_mutex, INFINITE);
251      // WaitForSingleObject could have returned WAIT_ABANDONED. We don't
252      // abort the process here. UI tests might be crashy sometimes,
253      // and aborting the test binary only makes the problem worse.
254      // We also don't use LOG macros because that might lead to an infinite
255      // loop. For more info see http://crbug.com/18028.
256#elif defined(OS_POSIX)
257      pthread_mutex_lock(&log_mutex);
258#endif
259    } else {
260      // use the lock
261      log_lock->Lock();
262    }
263  }
264
265  static void UnlockLogging() {
266    if (lock_log_file == LOCK_LOG_FILE) {
267#if defined(OS_WIN)
268      ReleaseMutex(log_mutex);
269#elif defined(OS_POSIX)
270      pthread_mutex_unlock(&log_mutex);
271#endif
272    } else {
273      log_lock->Unlock();
274    }
275  }
276
277  // The lock is used if log file locking is false. It helps us avoid problems
278  // with multiple threads writing to the log file at the same time.  Use
279  // LockImpl directly instead of using Lock, because Lock makes logging calls.
280  static base::internal::LockImpl* log_lock;
281
282  // When we don't use a lock, we are using a global mutex. We need to do this
283  // because LockFileEx is not thread safe.
284#if defined(OS_WIN)
285  static MutexHandle log_mutex;
286#elif defined(OS_POSIX)
287  static pthread_mutex_t log_mutex;
288#endif
289
290  static bool initialized;
291  static LogLockingState lock_log_file;
292};
293
294// static
295bool LoggingLock::initialized = false;
296// static
297base::internal::LockImpl* LoggingLock::log_lock = NULL;
298// static
299LogLockingState LoggingLock::lock_log_file = LOCK_LOG_FILE;
300
301#if defined(OS_WIN)
302// static
303MutexHandle LoggingLock::log_mutex = NULL;
304#elif defined(OS_POSIX)
305pthread_mutex_t LoggingLock::log_mutex = PTHREAD_MUTEX_INITIALIZER;
306#endif
307
308// Called by logging functions to ensure that debug_file is initialized
309// and can be used for writing. Returns false if the file could not be
310// initialized. debug_file will be NULL in this case.
311bool InitializeLogFileHandle() {
312  if (log_file)
313    return true;
314
315  if (!log_file_name) {
316    // Nobody has called InitLogging to specify a debug log file, so here we
317    // initialize the log file name to a default.
318    log_file_name = new PathString(GetDefaultLogFile());
319  }
320
321  if (logging_destination == LOG_ONLY_TO_FILE ||
322      logging_destination == LOG_TO_BOTH_FILE_AND_SYSTEM_DEBUG_LOG) {
323#if defined(OS_WIN)
324    log_file = CreateFile(log_file_name->c_str(), 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      // try the current directory
329      log_file = CreateFile(L".\\debug.log", 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        log_file = NULL;
334        return false;
335      }
336    }
337    SetFilePointer(log_file, 0, 0, FILE_END);
338#elif defined(OS_POSIX)
339    log_file = fopen(log_file_name->c_str(), "a");
340    if (log_file == NULL)
341      return false;
342#endif
343  }
344
345  return true;
346}
347
348bool BaseInitLoggingImpl(const PathChar* new_log_file,
349                         LoggingDestination logging_dest,
350                         LogLockingState lock_log,
351                         OldFileDeletionState delete_old,
352                         DcheckState dcheck_state) {
353#ifdef ANDROID
354  // ifdef is here because we don't support parsing command line parameters
355  g_dcheck_state = dcheck_state;
356  g_vlog_info = NULL;
357#else
358  CommandLine* command_line = CommandLine::ForCurrentProcess();
359  g_dcheck_state = dcheck_state;
360  delete g_vlog_info;
361  g_vlog_info = NULL;
362  // Don't bother initializing g_vlog_info unless we use one of the
363  // vlog switches.
364  if (command_line->HasSwitch(switches::kV) ||
365      command_line->HasSwitch(switches::kVModule)) {
366    g_vlog_info =
367        new VlogInfo(command_line->GetSwitchValueASCII(switches::kV),
368                     command_line->GetSwitchValueASCII(switches::kVModule),
369                     &min_log_level);
370  }
371#endif
372
373  LoggingLock::Init(lock_log, new_log_file);
374
375  LoggingLock logging_lock;
376
377  if (log_file) {
378    // calling InitLogging twice or after some log call has already opened the
379    // default log file will re-initialize to the new options
380    CloseFile(log_file);
381    log_file = NULL;
382  }
383
384  logging_destination = logging_dest;
385
386  // ignore file options if logging is disabled or only to system
387  if (logging_destination == LOG_NONE ||
388      logging_destination == LOG_ONLY_TO_SYSTEM_DEBUG_LOG)
389    return true;
390
391  if (!log_file_name)
392    log_file_name = new PathString();
393  *log_file_name = new_log_file;
394  if (delete_old == DELETE_OLD_LOG_FILE)
395    DeleteFilePath(*log_file_name);
396
397  return InitializeLogFileHandle();
398}
399
400void SetMinLogLevel(int level) {
401  min_log_level = std::min(LOG_ERROR_REPORT, level);
402}
403
404int GetMinLogLevel() {
405  return min_log_level;
406}
407
408int GetVlogVerbosity() {
409  return std::max(-1, LOG_INFO - GetMinLogLevel());
410}
411
412int GetVlogLevelHelper(const char* file, size_t N) {
413  DCHECK_GT(N, 0U);
414  return g_vlog_info ?
415      g_vlog_info->GetVlogLevel(base::StringPiece(file, N - 1)) :
416      GetVlogVerbosity();
417}
418
419void SetLogItems(bool enable_process_id, bool enable_thread_id,
420                 bool enable_timestamp, bool enable_tickcount) {
421  log_process_id = enable_process_id;
422  log_thread_id = enable_thread_id;
423  log_timestamp = enable_timestamp;
424  log_tickcount = enable_tickcount;
425}
426
427void SetShowErrorDialogs(bool enable_dialogs) {
428  show_error_dialogs = enable_dialogs;
429}
430
431void SetLogAssertHandler(LogAssertHandlerFunction handler) {
432  log_assert_handler = handler;
433}
434
435void SetLogReportHandler(LogReportHandlerFunction handler) {
436  log_report_handler = handler;
437}
438
439void SetLogMessageHandler(LogMessageHandlerFunction handler) {
440  log_message_handler = handler;
441}
442
443LogMessageHandlerFunction GetLogMessageHandler() {
444  return log_message_handler;
445}
446
447// MSVC doesn't like complex extern templates and DLLs.
448#if !defined(COMPILER_MSVC)
449// Explicit instantiations for commonly used comparisons.
450template std::string* MakeCheckOpString<int, int>(
451    const int&, const int&, const char* names);
452template std::string* MakeCheckOpString<unsigned long, unsigned long>(
453    const unsigned long&, const unsigned long&, const char* names);
454template std::string* MakeCheckOpString<unsigned long, unsigned int>(
455    const unsigned long&, const unsigned int&, const char* names);
456template std::string* MakeCheckOpString<unsigned int, unsigned long>(
457    const unsigned int&, const unsigned long&, const char* names);
458template std::string* MakeCheckOpString<std::string, std::string>(
459    const std::string&, const std::string&, const char* name);
460#endif
461
462// Displays a message box to the user with the error message in it.
463// Used for fatal messages, where we close the app simultaneously.
464// This is for developers only; we don't use this in circumstances
465// (like release builds) where users could see it, since users don't
466// understand these messages anyway.
467void DisplayDebugMessageInDialog(const std::string& str) {
468  if (str.empty())
469    return;
470
471  if (!show_error_dialogs)
472    return;
473
474#if defined(OS_WIN)
475  // For Windows programs, it's possible that the message loop is
476  // messed up on a fatal error, and creating a MessageBox will cause
477  // that message loop to be run. Instead, we try to spawn another
478  // process that displays its command line. We look for "Debug
479  // Message.exe" in the same directory as the application. If it
480  // exists, we use it, otherwise, we use a regular message box.
481  wchar_t prog_name[MAX_PATH];
482  GetModuleFileNameW(NULL, prog_name, MAX_PATH);
483  wchar_t* backslash = wcsrchr(prog_name, '\\');
484  if (backslash)
485    backslash[1] = 0;
486  wcscat_s(prog_name, MAX_PATH, L"debug_message.exe");
487
488  std::wstring cmdline = UTF8ToWide(str);
489  if (cmdline.empty())
490    return;
491
492  STARTUPINFO startup_info;
493  memset(&startup_info, 0, sizeof(startup_info));
494  startup_info.cb = sizeof(startup_info);
495
496  PROCESS_INFORMATION process_info;
497  if (CreateProcessW(prog_name, &cmdline[0], NULL, NULL, false, 0, NULL,
498                     NULL, &startup_info, &process_info)) {
499    WaitForSingleObject(process_info.hProcess, INFINITE);
500    CloseHandle(process_info.hThread);
501    CloseHandle(process_info.hProcess);
502  } else {
503    // debug process broken, let's just do a message box
504    MessageBoxW(NULL, &cmdline[0], L"Fatal error",
505                MB_OK | MB_ICONHAND | MB_TOPMOST);
506  }
507#else
508  // We intentionally don't implement a dialog on other platforms.
509  // You can just look at stderr.
510#endif
511}
512
513#if defined(OS_WIN)
514LogMessage::SaveLastError::SaveLastError() : last_error_(::GetLastError()) {
515}
516
517LogMessage::SaveLastError::~SaveLastError() {
518  ::SetLastError(last_error_);
519}
520#endif  // defined(OS_WIN)
521
522LogMessage::LogMessage(const char* file, int line, LogSeverity severity,
523                       int ctr)
524    : severity_(severity), file_(file), line_(line) {
525  Init(file, line);
526}
527
528LogMessage::LogMessage(const char* file, int line)
529    : severity_(LOG_INFO), file_(file), line_(line) {
530  Init(file, line);
531}
532
533LogMessage::LogMessage(const char* file, int line, LogSeverity severity)
534    : severity_(severity), file_(file), line_(line) {
535  Init(file, line);
536}
537
538LogMessage::LogMessage(const char* file, int line, std::string* result)
539    : severity_(LOG_FATAL), file_(file), line_(line) {
540  Init(file, line);
541  stream_ << "Check failed: " << *result;
542  delete result;
543}
544
545LogMessage::LogMessage(const char* file, int line, LogSeverity severity,
546                       std::string* result)
547    : severity_(severity), file_(file), line_(line) {
548  Init(file, line);
549  stream_ << "Check failed: " << *result;
550  delete result;
551}
552
553LogMessage::~LogMessage() {
554#ifndef NDEBUG
555  if (severity_ == LOG_FATAL) {
556    // Include a stack trace on a fatal.
557    base::debug::StackTrace trace;
558    stream_ << std::endl;  // Newline to separate from log message.
559    trace.OutputToStream(&stream_);
560  }
561#endif
562  stream_ << std::endl;
563  std::string str_newline(stream_.str());
564
565  // Give any log message handler first dibs on the message.
566  if (log_message_handler && log_message_handler(severity_, file_, line_,
567          message_start_, str_newline)) {
568    // The handler took care of it, no further processing.
569    return;
570  }
571
572  if (logging_destination == LOG_ONLY_TO_SYSTEM_DEBUG_LOG ||
573      logging_destination == LOG_TO_BOTH_FILE_AND_SYSTEM_DEBUG_LOG) {
574#if defined(OS_WIN)
575    OutputDebugStringA(str_newline.c_str());
576#endif
577    fprintf(stderr, "%s", str_newline.c_str());
578    fflush(stderr);
579  } else if (severity_ >= kAlwaysPrintErrorLevel) {
580    // When we're only outputting to a log file, above a certain log level, we
581    // should still output to stderr so that we can better detect and diagnose
582    // problems with unit tests, especially on the buildbots.
583    fprintf(stderr, "%s", str_newline.c_str());
584    fflush(stderr);
585  }
586
587  // We can have multiple threads and/or processes, so try to prevent them
588  // from clobbering each other's writes.
589  // If the client app did not call InitLogging, and the lock has not
590  // been created do it now. We do this on demand, but if two threads try
591  // to do this at the same time, there will be a race condition to create
592  // the lock. This is why InitLogging should be called from the main
593  // thread at the beginning of execution.
594  LoggingLock::Init(LOCK_LOG_FILE, NULL);
595  // write to log file
596  if (logging_destination != LOG_NONE &&
597      logging_destination != LOG_ONLY_TO_SYSTEM_DEBUG_LOG) {
598    LoggingLock logging_lock;
599    if (InitializeLogFileHandle()) {
600#if defined(OS_WIN)
601      SetFilePointer(log_file, 0, 0, SEEK_END);
602      DWORD num_written;
603      WriteFile(log_file,
604                static_cast<const void*>(str_newline.c_str()),
605                static_cast<DWORD>(str_newline.length()),
606                &num_written,
607                NULL);
608#else
609      fprintf(log_file, "%s", str_newline.c_str());
610      fflush(log_file);
611#endif
612    }
613  }
614
615  if (severity_ == LOG_FATAL) {
616    // display a message or break into the debugger on a fatal error
617    if (base::debug::BeingDebugged()) {
618      base::debug::BreakDebugger();
619    } else {
620      if (log_assert_handler) {
621        // make a copy of the string for the handler out of paranoia
622        log_assert_handler(std::string(stream_.str()));
623      } else {
624        // Don't use the string with the newline, get a fresh version to send to
625        // the debug message process. We also don't display assertions to the
626        // user in release mode. The enduser can't do anything with this
627        // information, and displaying message boxes when the application is
628        // hosed can cause additional problems.
629#ifndef NDEBUG
630        DisplayDebugMessageInDialog(stream_.str());
631#endif
632        // Crash the process to generate a dump.
633        base::debug::BreakDebugger();
634      }
635    }
636  } else if (severity_ == LOG_ERROR_REPORT) {
637    // We are here only if the user runs with --enable-dcheck in release mode.
638    if (log_report_handler) {
639      log_report_handler(std::string(stream_.str()));
640    } else {
641      DisplayDebugMessageInDialog(stream_.str());
642    }
643  }
644}
645
646// writes the common header info to the stream
647void LogMessage::Init(const char* file, int line) {
648  base::StringPiece filename(file);
649  size_t last_slash_pos = filename.find_last_of("\\/");
650  if (last_slash_pos != base::StringPiece::npos)
651    filename.remove_prefix(last_slash_pos + 1);
652
653  // TODO(darin): It might be nice if the columns were fixed width.
654
655  stream_ <<  '[';
656  if (log_process_id)
657    stream_ << CurrentProcessId() << ':';
658  if (log_thread_id)
659    stream_ << CurrentThreadId() << ':';
660  if (log_timestamp) {
661    time_t t = time(NULL);
662    struct tm local_time = {0};
663#if _MSC_VER >= 1400
664    localtime_s(&local_time, &t);
665#else
666    localtime_r(&t, &local_time);
667#endif
668    struct tm* tm_time = &local_time;
669    stream_ << std::setfill('0')
670            << std::setw(2) << 1 + tm_time->tm_mon
671            << std::setw(2) << tm_time->tm_mday
672            << '/'
673            << std::setw(2) << tm_time->tm_hour
674            << std::setw(2) << tm_time->tm_min
675            << std::setw(2) << tm_time->tm_sec
676            << ':';
677  }
678  if (log_tickcount)
679    stream_ << TickCount() << ':';
680  if (severity_ >= 0)
681    stream_ << log_severity_names[severity_];
682  else
683    stream_ << "VERBOSE" << -severity_;
684
685  stream_ << ":" << filename << "(" << line << ")] ";
686
687  message_start_ = stream_.tellp();
688}
689
690#if defined(OS_WIN)
691// This has already been defined in the header, but defining it again as DWORD
692// ensures that the type used in the header is equivalent to DWORD. If not,
693// the redefinition is a compile error.
694typedef DWORD SystemErrorCode;
695#endif
696
697SystemErrorCode GetLastSystemErrorCode() {
698#if defined(OS_WIN)
699  return ::GetLastError();
700#elif defined(OS_POSIX)
701  return errno;
702#else
703#error Not implemented
704#endif
705}
706
707#if defined(OS_WIN)
708Win32ErrorLogMessage::Win32ErrorLogMessage(const char* file,
709                                           int line,
710                                           LogSeverity severity,
711                                           SystemErrorCode err,
712                                           const char* module)
713    : err_(err),
714      module_(module),
715      log_message_(file, line, severity) {
716}
717
718Win32ErrorLogMessage::Win32ErrorLogMessage(const char* file,
719                                           int line,
720                                           LogSeverity severity,
721                                           SystemErrorCode err)
722    : err_(err),
723      module_(NULL),
724      log_message_(file, line, severity) {
725}
726
727Win32ErrorLogMessage::~Win32ErrorLogMessage() {
728  const int error_message_buffer_size = 256;
729  char msgbuf[error_message_buffer_size];
730  DWORD flags = FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS;
731  HMODULE hmod;
732  if (module_) {
733    hmod = GetModuleHandleA(module_);
734    if (hmod) {
735      flags |= FORMAT_MESSAGE_FROM_HMODULE;
736    } else {
737      // This makes a nested Win32ErrorLogMessage. It will have module_ of NULL
738      // so it will not call GetModuleHandle, so recursive errors are
739      // impossible.
740      DPLOG(WARNING) << "Couldn't open module " << module_
741          << " for error message query";
742    }
743  } else {
744    hmod = NULL;
745  }
746  DWORD len = FormatMessageA(flags,
747                             hmod,
748                             err_,
749                             0,
750                             msgbuf,
751                             sizeof(msgbuf) / sizeof(msgbuf[0]),
752                             NULL);
753  if (len) {
754    while ((len > 0) &&
755           isspace(static_cast<unsigned char>(msgbuf[len - 1]))) {
756      msgbuf[--len] = 0;
757    }
758    stream() << ": " << msgbuf;
759  } else {
760    stream() << ": Error " << GetLastError() << " while retrieving error "
761        << err_;
762  }
763}
764#elif defined(OS_POSIX)
765ErrnoLogMessage::ErrnoLogMessage(const char* file,
766                                 int line,
767                                 LogSeverity severity,
768                                 SystemErrorCode err)
769    : err_(err),
770      log_message_(file, line, severity) {
771}
772
773ErrnoLogMessage::~ErrnoLogMessage() {
774  stream() << ": " << safe_strerror(err_);
775}
776#endif  // OS_WIN
777
778void CloseLogFile() {
779  LoggingLock logging_lock;
780
781  if (!log_file)
782    return;
783
784  CloseFile(log_file);
785  log_file = NULL;
786}
787
788void RawLog(int level, const char* message) {
789  if (level >= min_log_level) {
790    size_t bytes_written = 0;
791    const size_t message_len = strlen(message);
792    int rv;
793    while (bytes_written < message_len) {
794      rv = HANDLE_EINTR(
795          write(STDERR_FILENO, message + bytes_written,
796                message_len - bytes_written));
797      if (rv < 0) {
798        // Give up, nothing we can do now.
799        break;
800      }
801      bytes_written += rv;
802    }
803
804    if (message_len > 0 && message[message_len - 1] != '\n') {
805      do {
806        rv = HANDLE_EINTR(write(STDERR_FILENO, "\n", 1));
807        if (rv < 0) {
808          // Give up, nothing we can do now.
809          break;
810        }
811      } while (rv != 1);
812    }
813  }
814
815  if (level == LOG_FATAL)
816    base::debug::BreakDebugger();
817}
818
819}  // namespace logging
820
821std::ostream& operator<<(std::ostream& out, const wchar_t* wstr) {
822  return out << WideToUTF8(std::wstring(wstr));
823}
824