summaryrefslogtreecommitdiffstats
blob: 1f7bc2ab9336aee73e92ac0cc66fa10fb46e8fe5 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
/*
 * Copyright (C) 2015 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#if defined(_WIN32)
#include <windows.h>
#endif

#include "android-base/logging.h"

#include <fcntl.h>
#include <libgen.h>
#include <time.h>

// For getprogname(3) or program_invocation_short_name.
#if defined(__ANDROID__) || defined(__APPLE__)
#include <stdlib.h>
#elif defined(__GLIBC__)
#include <errno.h>
#endif

#if defined(__linux__)
#include <sys/uio.h>
#endif

#include <iostream>
#include <limits>
#include <mutex>
#include <sstream>
#include <string>
#include <utility>
#include <vector>

// Headers for LogMessage::LogLine.
#ifdef __ANDROID__
#include <android/log.h>
#include <android/set_abort_message.h>
#else
#include <sys/types.h>
#include <unistd.h>
#endif

#include <android-base/macros.h>
#include <android-base/strings.h>

// For gettid.
#if defined(__APPLE__)
#include "AvailabilityMacros.h"  // For MAC_OS_X_VERSION_MAX_ALLOWED
#include <stdint.h>
#include <stdlib.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <unistd.h>
#elif defined(__linux__) && !defined(__ANDROID__)
#include <syscall.h>
#include <unistd.h>
#elif defined(_WIN32)
#include <windows.h>
#endif

#if defined(_WIN32)
typedef uint32_t thread_id;
#else
typedef pid_t thread_id;
#endif

static thread_id GetThreadId() {
#if defined(__BIONIC__)
  return gettid();
#elif defined(__APPLE__)
  uint64_t tid;
  pthread_threadid_np(NULL, &tid);
  return tid;
#elif defined(__linux__)
  return syscall(__NR_gettid);
#elif defined(_WIN32)
  return GetCurrentThreadId();
#endif
}

namespace {
#if defined(__GLIBC__)
const char* getprogname() {
  return program_invocation_short_name;
}
#elif defined(_WIN32)
const char* getprogname() {
  static bool first = true;
  static char progname[MAX_PATH] = {};

  if (first) {
    CHAR longname[MAX_PATH];
    DWORD nchars = GetModuleFileNameA(nullptr, longname, arraysize(longname));
    if ((nchars >= arraysize(longname)) || (nchars == 0)) {
      // String truncation or some other error.
      strcpy(progname, "<unknown>");
    } else {
      strcpy(progname, basename(longname));
    }
    first = false;
  }

  return progname;
}
#endif
} // namespace

namespace android {
namespace base {

static std::mutex& LoggingLock() {
  static auto& logging_lock = *new std::mutex();
  return logging_lock;
}

static LogFunction& Logger() {
#ifdef __ANDROID__
  static auto& logger = *new LogFunction(LogdLogger());
#else
  static auto& logger = *new LogFunction(StderrLogger);
#endif
  return logger;
}

static AbortFunction& Aborter() {
  static auto& aborter = *new AbortFunction(DefaultAborter);
  return aborter;
}

static std::string& ProgramInvocationName() {
  static auto& programInvocationName = *new std::string(getprogname());
  return programInvocationName;
}

static bool gInitialized = false;
static LogSeverity gMinimumLogSeverity = INFO;

#if defined(__linux__)
void KernelLogger(android::base::LogId, android::base::LogSeverity severity,
                  const char* tag, const char*, unsigned int, const char* msg) {
  // clang-format off
  static constexpr int kLogSeverityToKernelLogLevel[] = {
      [android::base::VERBOSE] = 7,              // KERN_DEBUG (there is no verbose kernel log
                                                 //             level)
      [android::base::DEBUG] = 7,                // KERN_DEBUG
      [android::base::INFO] = 6,                 // KERN_INFO
      [android::base::WARNING] = 4,              // KERN_WARNING
      [android::base::ERROR] = 3,                // KERN_ERROR
      [android::base::FATAL_WITHOUT_ABORT] = 2,  // KERN_CRIT
      [android::base::FATAL] = 2,                // KERN_CRIT
  };
  // clang-format on
  static_assert(arraysize(kLogSeverityToKernelLogLevel) == android::base::FATAL + 1,
                "Mismatch in size of kLogSeverityToKernelLogLevel and values in LogSeverity");

  static int klog_fd = TEMP_FAILURE_RETRY(open("/dev/kmsg", O_WRONLY | O_CLOEXEC));
  if (klog_fd == -1) return;

  int level = kLogSeverityToKernelLogLevel[severity];

  // The kernel's printk buffer is only 1024 bytes.
  // TODO: should we automatically break up long lines into multiple lines?
  // Or we could log but with something like "..." at the end?
  char buf[1024];
  size_t size = snprintf(buf, sizeof(buf), "<%d>%s: %s\n", level, tag, msg);
  if (size > sizeof(buf)) {
    size = snprintf(buf, sizeof(buf), "<%d>%s: %zu-byte message too long for printk\n",
                    level, tag, size);
  }

  iovec iov[1];
  iov[0].iov_base = buf;
  iov[0].iov_len = size;
  TEMP_FAILURE_RETRY(writev(klog_fd, iov, 1));
}
#endif

void StderrLogger(LogId, LogSeverity severity, const char* tag, const char* file, unsigned int line,
                  const char* message) {
  struct tm now;
  time_t t = time(nullptr);

#if defined(_WIN32)
  localtime_s(&now, &t);
#else
  localtime_r(&t, &now);
#endif

  char timestamp[32];
  strftime(timestamp, sizeof(timestamp), "%m-%d %H:%M:%S", &now);

  static const char log_characters[] = "VDIWEFF";
  static_assert(arraysize(log_characters) - 1 == FATAL + 1,
                "Mismatch in size of log_characters and values in LogSeverity");
  char severity_char = log_characters[severity];
  fprintf(stderr, "%s %c %s %5d %5d %s:%u] %s\n", tag ? tag : "nullptr", severity_char, timestamp,
          getpid(), GetThreadId(), file, line, message);
}

void DefaultAborter(const char* abort_message) {
#ifdef __ANDROID__
  android_set_abort_message(abort_message);
#else
  UNUSED(abort_message);
#endif
  abort();
}


#ifdef __ANDROID__
LogdLogger::LogdLogger(LogId default_log_id) : default_log_id_(default_log_id) {
}

void LogdLogger::operator()(LogId id, LogSeverity severity, const char* tag,
                            const char* file, unsigned int line,
                            const char* message) {
  static constexpr android_LogPriority kLogSeverityToAndroidLogPriority[] = {
      ANDROID_LOG_VERBOSE, ANDROID_LOG_DEBUG, ANDROID_LOG_INFO,
      ANDROID_LOG_WARN,    ANDROID_LOG_ERROR, ANDROID_LOG_FATAL,
      ANDROID_LOG_FATAL,
  };
  static_assert(arraysize(kLogSeverityToAndroidLogPriority) == FATAL + 1,
                "Mismatch in size of kLogSeverityToAndroidLogPriority and values in LogSeverity");

  int priority = kLogSeverityToAndroidLogPriority[severity];
  if (id == DEFAULT) {
    id = default_log_id_;
  }

  static constexpr log_id kLogIdToAndroidLogId[] = {
    LOG_ID_MAX, LOG_ID_MAIN, LOG_ID_SYSTEM,
  };
  static_assert(arraysize(kLogIdToAndroidLogId) == SYSTEM + 1,
                "Mismatch in size of kLogIdToAndroidLogId and values in LogId");
  log_id lg_id = kLogIdToAndroidLogId[id];

  if (priority == ANDROID_LOG_FATAL) {
    __android_log_buf_print(lg_id, priority, tag, "%s:%u] %s", file, line,
                            message);
  } else {
    __android_log_buf_print(lg_id, priority, tag, "%s", message);
  }
}
#endif

void InitLogging(char* argv[], LogFunction&& logger, AbortFunction&& aborter) {
  SetLogger(std::forward<LogFunction>(logger));
  SetAborter(std::forward<AbortFunction>(aborter));

  if (gInitialized) {
    return;
  }

  gInitialized = true;

  // Stash the command line for later use. We can use /proc/self/cmdline on
  // Linux to recover this, but we don't have that luxury on the Mac/Windows,
  // and there are a couple of argv[0] variants that are commonly used.
  if (argv != nullptr) {
    std::lock_guard<std::mutex> lock(LoggingLock());
    ProgramInvocationName() = basename(argv[0]);
  }

  const char* tags = getenv("ANDROID_LOG_TAGS");
  if (tags == nullptr) {
    return;
  }

  std::vector<std::string> specs = Split(tags, " ");
  for (size_t i = 0; i < specs.size(); ++i) {
    // "tag-pattern:[vdiwefs]"
    std::string spec(specs[i]);
    if (spec.size() == 3 && StartsWith(spec, "*:")) {
      switch (spec[2]) {
        case 'v':
          gMinimumLogSeverity = VERBOSE;
          continue;
        case 'd':
          gMinimumLogSeverity = DEBUG;
          continue;
        case 'i':
          gMinimumLogSeverity = INFO;
          continue;
        case 'w':
          gMinimumLogSeverity = WARNING;
          continue;
        case 'e':
          gMinimumLogSeverity = ERROR;
          continue;
        case 'f':
          gMinimumLogSeverity = FATAL_WITHOUT_ABORT;
          continue;
        // liblog will even suppress FATAL if you say 's' for silent, but that's
        // crazy!
        case 's':
          gMinimumLogSeverity = FATAL_WITHOUT_ABORT;
          continue;
      }
    }
    LOG(FATAL) << "unsupported '" << spec << "' in ANDROID_LOG_TAGS (" << tags
               << ")";
  }
}

void SetLogger(LogFunction&& logger) {
  std::lock_guard<std::mutex> lock(LoggingLock());
  Logger() = std::move(logger);
}

void SetAborter(AbortFunction&& aborter) {
  std::lock_guard<std::mutex> lock(LoggingLock());
  Aborter() = std::move(aborter);
}

static const char* GetFileBasename(const char* file) {
  // We can't use basename(3) even on Unix because the Mac doesn't
  // have a non-modifying basename.
  const char* last_slash = strrchr(file, '/');
  if (last_slash != nullptr) {
    return last_slash + 1;
  }
#if defined(_WIN32)
  const char* last_backslash = strrchr(file, '\\');
  if (last_backslash != nullptr) {
    return last_backslash + 1;
  }
#endif
  return file;
}

// This indirection greatly reduces the stack impact of having lots of
// checks/logging in a function.
class LogMessageData {
 public:
  LogMessageData(const char* file, unsigned int line, LogId id, LogSeverity severity,
                 const char* tag, int error)
      : file_(GetFileBasename(file)),
        line_number_(line),
        id_(id),
        severity_(severity),
        tag_(tag),
        error_(error) {}

  const char* GetFile() const {
    return file_;
  }

  unsigned int GetLineNumber() const {
    return line_number_;
  }

  LogSeverity GetSeverity() const {
    return severity_;
  }

  const char* GetTag() const { return tag_; }

  LogId GetId() const {
    return id_;
  }

  int GetError() const {
    return error_;
  }

  std::ostream& GetBuffer() {
    return buffer_;
  }

  std::string ToString() const {
    return buffer_.str();
  }

 private:
  std::ostringstream buffer_;
  const char* const file_;
  const unsigned int line_number_;
  const LogId id_;
  const LogSeverity severity_;
  const char* const tag_;
  const int error_;

  DISALLOW_COPY_AND_ASSIGN(LogMessageData);
};

LogMessage::LogMessage(const char* file, unsigned int line, LogId id, LogSeverity severity,
                       const char* tag, int error)
    : data_(new LogMessageData(file, line, id, severity, tag, error)) {}

LogMessage::LogMessage(const char* file, unsigned int line, LogId id, LogSeverity severity,
                       int error)
    : LogMessage(file, line, id, severity, nullptr, error) {}

LogMessage::~LogMessage() {
  // Check severity again. This is duplicate work wrt/ LOG macros, but not LOG_STREAM.
  if (!WOULD_LOG(data_->GetSeverity())) {
    return;
  }

  // Finish constructing the message.
  if (data_->GetError() != -1) {
    data_->GetBuffer() << ": " << strerror(data_->GetError());
  }
  std::string msg(data_->ToString());

  {
    // Do the actual logging with the lock held.
    std::lock_guard<std::mutex> lock(LoggingLock());
    if (msg.find('\n') == std::string::npos) {
      LogLine(data_->GetFile(), data_->GetLineNumber(), data_->GetId(), data_->GetSeverity(),
              data_->GetTag(), msg.c_str());
    } else {
      msg += '\n';
      size_t i = 0;
      while (i < msg.size()) {
        size_t nl = msg.find('\n', i);
        msg[nl] = '\0';
        LogLine(data_->GetFile(), data_->GetLineNumber(), data_->GetId(), data_->GetSeverity(),
                data_->GetTag(), &msg[i]);
        // Undo the zero-termination so we can give the complete message to the aborter.
        msg[nl] = '\n';
        i = nl + 1;
      }
    }
  }

  // Abort if necessary.
  if (data_->GetSeverity() == FATAL) {
    Aborter()(msg.c_str());
  }
}

std::ostream& LogMessage::stream() {
  return data_->GetBuffer();
}

void LogMessage::LogLine(const char* file, unsigned int line, LogId id, LogSeverity severity,
                         const char* tag, const char* message) {
  if (tag == nullptr) tag = ProgramInvocationName().c_str();
  Logger()(id, severity, tag, file, line, message);
}

void LogMessage::LogLine(const char* file, unsigned int line, LogId id, LogSeverity severity,
                         const char* message) {
  LogLine(file, line, id, severity, nullptr, message);
}

LogSeverity GetMinimumLogSeverity() {
    return gMinimumLogSeverity;
}

LogSeverity SetMinimumLogSeverity(LogSeverity new_severity) {
  LogSeverity old_severity = gMinimumLogSeverity;
  gMinimumLogSeverity = new_severity;
  return old_severity;
}

ScopedLogSeverity::ScopedLogSeverity(LogSeverity new_severity) {
  old_ = SetMinimumLogSeverity(new_severity);
}

ScopedLogSeverity::~ScopedLogSeverity() {
  SetMinimumLogSeverity(old_);
}

}  // namespace base
}  // namespace android