summaryrefslogtreecommitdiffstats
blob: 567335786e7a1f90b326455911988c8052875f22 (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
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
/*
 * Copyright (C) 2009 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.
 */

#ifndef _ANDROID_LOG_H
#define _ANDROID_LOG_H

/******************************************************************
 *
 * IMPORTANT NOTICE:
 *
 *   This file is part of Android's set of stable system headers
 *   exposed by the Android NDK (Native Development Kit) since
 *   platform release 1.5
 *
 *   Third-party source AND binary code relies on the definitions
 *   here to be FROZEN ON ALL UPCOMING PLATFORM RELEASES.
 *
 *   - DO NOT MODIFY ENUMS (EXCEPT IF YOU ADD NEW 32-BIT VALUES)
 *   - DO NOT MODIFY CONSTANTS OR FUNCTIONAL MACROS
 *   - DO NOT CHANGE THE SIGNATURE OF FUNCTIONS IN ANY WAY
 *   - DO NOT CHANGE THE LAYOUT OR SIZE OF STRUCTURES
 */

/*
 * Support routines to send messages to the Android in-kernel log buffer,
 * which can later be accessed through the 'logcat' utility.
 *
 * Each log message must have
 *   - a priority
 *   - a log tag
 *   - some text
 *
 * The tag normally corresponds to the component that emits the log message,
 * and should be reasonably small.
 *
 * Log message text may be truncated to less than an implementation-specific
 * limit (e.g. 1023 characters max).
 *
 * Note that a newline character ("\n") will be appended automatically to your
 * log message, if not already there. It is not possible to send several messages
 * and have them appear on a single line in logcat.
 *
 * PLEASE USE LOGS WITH MODERATION:
 *
 *  - Sending log messages eats CPU and slow down your application and the
 *    system.
 *
 *  - The circular log buffer is pretty small (<64KB), sending many messages
 *    might push off other important log messages from the rest of the system.
 *
 *  - In release builds, only send log messages to account for exceptional
 *    conditions.
 *
 * NOTE: These functions MUST be implemented by /system/lib/liblog.so
 */

#include <stdarg.h>

#ifdef __cplusplus
extern "C" {
#endif

/*
 * This file uses ", ## __VA_ARGS__" zero-argument token pasting to
 * work around issues with debug-only syntax errors in assertions
 * that are missing format strings.  See commit
 * 19299904343daf191267564fe32e6cd5c165cd42
 */
#if defined(__clang__)
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wgnu-zero-variadic-macro-arguments"
#endif

#ifndef __predict_false
#define __predict_false(exp) __builtin_expect((exp) != 0, 0)
#endif

/*
 * LOG_TAG is the local tag used for the following simplified
 * logging macros.  You must set this preprocessor definition,
 * or more tenuously supply a variable definition, before using
 * the macros.
 */

/*
 * Normally we strip the effects of ALOGV (VERBOSE messages),
 * LOG_FATAL and LOG_FATAL_IF (FATAL assert messages) from the
 * release builds be defining NDEBUG.  You can modify this (for
 * example with "#define LOG_NDEBUG 0" at the top of your source
 * file) to change that behavior.
 */

#ifndef LOG_NDEBUG
#ifdef NDEBUG
#define LOG_NDEBUG 1
#else
#define LOG_NDEBUG 0
#endif
#endif

/*
 * Android log priority values, in ascending priority order.
 */
#ifndef __android_LogPriority_defined
#define __android_LogPriority_defined
typedef enum android_LogPriority {
    ANDROID_LOG_UNKNOWN = 0,
    ANDROID_LOG_DEFAULT,    /* only for SetMinPriority() */
    ANDROID_LOG_VERBOSE,
    ANDROID_LOG_DEBUG,
    ANDROID_LOG_INFO,
    ANDROID_LOG_WARN,
    ANDROID_LOG_ERROR,
    ANDROID_LOG_FATAL,
    ANDROID_LOG_SILENT,     /* only for SetMinPriority(); must be last */
} android_LogPriority;
#endif

/*
 * Send a simple string to the log.
 */
int __android_log_write(int prio, const char* tag, const char* text);

#define android_writeLog(prio, tag, text) \
    __android_log_write(prio, tag, text)

/*
 * Send a formatted string to the log, used like printf(fmt,...)
 */
int __android_log_print(int prio, const char* tag,  const char* fmt, ...)
#if defined(__GNUC__)
#ifdef __USE_MINGW_ANSI_STDIO
#if __USE_MINGW_ANSI_STDIO
    __attribute__ ((format(gnu_printf, 3, 4)))
#else
    __attribute__ ((format(printf, 3, 4)))
#endif
#else
    __attribute__ ((format(printf, 3, 4)))
#endif
#endif
    ;

#define android_printLog(prio, tag, ...) \
    __android_log_print(prio, tag, __VA_ARGS__)

/*
 * Log macro that allows you to specify a number for the priority.
 */
#ifndef LOG_PRI
#define LOG_PRI(priority, tag, ...) \
    android_printLog(priority, tag, __VA_ARGS__)
#endif

/*
 * A variant of __android_log_print() that takes a va_list to list
 * additional parameters.
 */
int __android_log_vprint(int prio, const char* tag,
                         const char* fmt, va_list ap)
#if defined(__GNUC__)
#ifdef __USE_MINGW_ANSI_STDIO
#if __USE_MINGW_ANSI_STDIO
    __attribute__ ((format(gnu_printf, 3, 0)))
#else
    __attribute__ ((format(printf, 3, 0)))
#endif
#else
    __attribute__ ((format(printf, 3, 0)))
#endif
#endif
    ;

#define android_vprintLog(prio, cond, tag, ...) \
    __android_log_vprint(prio, tag, __VA_ARGS__)

/*
 * Log macro that allows you to pass in a varargs ("args" is a va_list).
 */
#ifndef LOG_PRI_VA
#define LOG_PRI_VA(priority, tag, fmt, args) \
    android_vprintLog(priority, NULL, tag, fmt, args)
#endif

/*
 * Log an assertion failure and abort the process to have a chance
 * to inspect it if a debugger is attached. This uses the FATAL priority.
 */
void __android_log_assert(const char* cond, const char* tag,
                          const char* fmt, ...)
#if defined(__GNUC__)
    __attribute__ ((__noreturn__))
#ifdef __USE_MINGW_ANSI_STDIO
#if __USE_MINGW_ANSI_STDIO
    __attribute__ ((format(gnu_printf, 3, 4)))
#else
    __attribute__ ((format(printf, 3, 4)))
#endif
#else
    __attribute__ ((format(printf, 3, 4)))
#endif
#endif
    ;

/* XXX Macros to work around syntax errors in places where format string
 * arg is not passed to ALOG_ASSERT, LOG_ALWAYS_FATAL or LOG_ALWAYS_FATAL_IF
 * (happens only in debug builds).
 */

/* Returns 2nd arg.  Used to substitute default value if caller's vararg list
 * is empty.
 */
#define __android_second(dummy, second, ...)     second

/* If passed multiple args, returns ',' followed by all but 1st arg, otherwise
 * returns nothing.
 */
#define __android_rest(first, ...)               , ## __VA_ARGS__

#define android_printAssert(cond, tag, ...) \
    __android_log_assert(cond, tag, \
        __android_second(0, ## __VA_ARGS__, NULL) __android_rest(__VA_ARGS__))

/*
 * Log a fatal error.  If the given condition fails, this stops program
 * execution like a normal assertion, but also generating the given message.
 * It is NOT stripped from release builds.  Note that the condition test
 * is -inverted- from the normal assert() semantics.
 */
#ifndef LOG_ALWAYS_FATAL_IF
#define LOG_ALWAYS_FATAL_IF(cond, ...) \
    ( (__predict_false(cond)) \
    ? ((void)android_printAssert(#cond, LOG_TAG, ## __VA_ARGS__)) \
    : (void)0 )
#endif

#ifndef LOG_ALWAYS_FATAL
#define LOG_ALWAYS_FATAL(...) \
    ( ((void)android_printAssert(NULL, LOG_TAG, ## __VA_ARGS__)) )
#endif

/*
 * Versions of LOG_ALWAYS_FATAL_IF and LOG_ALWAYS_FATAL that
 * are stripped out of release builds.
 */

#if LOG_NDEBUG

#ifndef LOG_FATAL_IF
#define LOG_FATAL_IF(cond, ...) ((void)0)
#endif
#ifndef LOG_FATAL
#define LOG_FATAL(...) ((void)0)
#endif

#else

#ifndef LOG_FATAL_IF
#define LOG_FATAL_IF(cond, ...) LOG_ALWAYS_FATAL_IF(cond, ## __VA_ARGS__)
#endif
#ifndef LOG_FATAL
#define LOG_FATAL(...) LOG_ALWAYS_FATAL(__VA_ARGS__)
#endif

#endif

/*
 * Assertion that generates a log message when the assertion fails.
 * Stripped out of release builds.  Uses the current LOG_TAG.
 */
#ifndef ALOG_ASSERT
#define ALOG_ASSERT(cond, ...) LOG_FATAL_IF(!(cond), ## __VA_ARGS__)
#endif

/* --------------------------------------------------------------------- */

/*
 * C/C++ logging functions.  See the logging documentation for API details.
 *
 * We'd like these to be available from C code (in case we import some from
 * somewhere), so this has a C interface.
 *
 * The output will be correct when the log file is shared between multiple
 * threads and/or multiple processes so long as the operating system
 * supports O_APPEND.  These calls have mutex-protected data structures
 * and so are NOT reentrant.  Do not use LOG in a signal handler.
 */

/* --------------------------------------------------------------------- */

/*
 * Simplified macro to send a verbose log message using the current LOG_TAG.
 */
#ifndef ALOGV
#define __ALOGV(...) ((void)ALOG(LOG_VERBOSE, LOG_TAG, __VA_ARGS__))
#if LOG_NDEBUG
#define ALOGV(...) do { if (0) { __ALOGV(__VA_ARGS__); } } while (0)
#else
#define ALOGV(...) __ALOGV(__VA_ARGS__)
#endif
#endif

#ifndef ALOGV_IF
#if LOG_NDEBUG
#define ALOGV_IF(cond, ...)   ((void)0)
#else
#define ALOGV_IF(cond, ...) \
    ( (__predict_false(cond)) \
    ? ((void)ALOG(LOG_VERBOSE, LOG_TAG, __VA_ARGS__)) \
    : (void)0 )
#endif
#endif

/*
 * Simplified macro to send a debug log message using the current LOG_TAG.
 */
#ifndef ALOGD
#define ALOGD(...) ((void)ALOG(LOG_DEBUG, LOG_TAG, __VA_ARGS__))
#endif

#ifndef ALOGD_IF
#define ALOGD_IF(cond, ...) \
    ( (__predict_false(cond)) \
    ? ((void)ALOG(LOG_DEBUG, LOG_TAG, __VA_ARGS__)) \
    : (void)0 )
#endif

/*
 * Simplified macro to send an info log message using the current LOG_TAG.
 */
#ifndef ALOGI
#define ALOGI(...) ((void)ALOG(LOG_INFO, LOG_TAG, __VA_ARGS__))
#endif

#ifndef ALOGI_IF
#define ALOGI_IF(cond, ...) \
    ( (__predict_false(cond)) \
    ? ((void)ALOG(LOG_INFO, LOG_TAG, __VA_ARGS__)) \
    : (void)0 )
#endif

/*
 * Simplified macro to send a warning log message using the current LOG_TAG.
 */
#ifndef ALOGW
#define ALOGW(...) ((void)ALOG(LOG_WARN, LOG_TAG, __VA_ARGS__))
#endif

#ifndef ALOGW_IF
#define ALOGW_IF(cond, ...) \
    ( (__predict_false(cond)) \
    ? ((void)ALOG(LOG_WARN, LOG_TAG, __VA_ARGS__)) \
    : (void)0 )
#endif

/*
 * Simplified macro to send an error log message using the current LOG_TAG.
 */
#ifndef ALOGE
#define ALOGE(...) ((void)ALOG(LOG_ERROR, LOG_TAG, __VA_ARGS__))
#endif

#ifndef ALOGE_IF
#define ALOGE_IF(cond, ...) \
    ( (__predict_false(cond)) \
    ? ((void)ALOG(LOG_ERROR, LOG_TAG, __VA_ARGS__)) \
    : (void)0 )
#endif

/* --------------------------------------------------------------------- */

/*
 * Conditional based on whether the current LOG_TAG is enabled at
 * verbose priority.
 */
#ifndef IF_ALOGV
#if LOG_NDEBUG
#define IF_ALOGV() if (false)
#else
#define IF_ALOGV() IF_ALOG(LOG_VERBOSE, LOG_TAG)
#endif
#endif

/*
 * Conditional based on whether the current LOG_TAG is enabled at
 * debug priority.
 */
#ifndef IF_ALOGD
#define IF_ALOGD() IF_ALOG(LOG_DEBUG, LOG_TAG)
#endif

/*
 * Conditional based on whether the current LOG_TAG is enabled at
 * info priority.
 */
#ifndef IF_ALOGI
#define IF_ALOGI() IF_ALOG(LOG_INFO, LOG_TAG)
#endif

/*
 * Conditional based on whether the current LOG_TAG is enabled at
 * warn priority.
 */
#ifndef IF_ALOGW
#define IF_ALOGW() IF_ALOG(LOG_WARN, LOG_TAG)
#endif

/*
 * Conditional based on whether the current LOG_TAG is enabled at
 * error priority.
 */
#ifndef IF_ALOGE
#define IF_ALOGE() IF_ALOG(LOG_ERROR, LOG_TAG)
#endif

/* --------------------------------------------------------------------- */

/*
 * Basic log message macro.
 *
 * Example:
 *  ALOG(LOG_WARN, NULL, "Failed with error %d", errno);
 *
 * The second argument may be NULL or "" to indicate the "global" tag.
 */
#ifndef ALOG
#define ALOG(priority, tag, ...) \
    LOG_PRI(ANDROID_##priority, tag, __VA_ARGS__)
#endif

/*
 * Conditional given a desired logging priority and tag.
 */
#ifndef IF_ALOG
#define IF_ALOG(priority, tag) \
    if (android_testLog(ANDROID_##priority, tag))
#endif

/* --------------------------------------------------------------------- */

/*
 *    IF_ALOG uses android_testLog, but IF_ALOG can be overridden.
 *    android_testLog will remain constant in its purpose as a wrapper
 *        for Android logging filter policy, and can be subject to
 *        change. It can be reused by the developers that override
 *        IF_ALOG as a convenient means to reimplement their policy
 *        over Android.
 */

#ifndef __ANDROID_USE_LIBLOG_LOGGABLE_INTERFACE
#ifndef __ANDROID_API__
#define __ANDROID_USE_LIBLOG_LOGGABLE_INTERFACE 2
#elif __ANDROID_API__ > 24 /* > Nougat */
#define __ANDROID_USE_LIBLOG_LOGGABLE_INTERFACE 2
#elif __ANDROID_API__ > 22 /* > Lollipop */
#define __ANDROID_USE_LIBLOG_LOGGABLE_INTERFACE 1
#else
#define __ANDROID_USE_LIBLOG_LOGGABLE_INTERFACE 0
#endif
#endif

#if __ANDROID_USE_LIBLOG_LOGGABLE_INTERFACE

/*
 * Use the per-tag properties "log.tag.<tagname>" to generate a runtime
 * result of non-zero to expose a log. prio is ANDROID_LOG_VERBOSE to
 * ANDROID_LOG_FATAL. default_prio if no property. Undefined behavior if
 * any other value.
 */
int __android_log_is_loggable(int prio, const char* tag, int default_prio);

#if __ANDROID_USE_LIBLOG_LOGGABLE_INTERFACE > 1
#include <sys/types.h>

int __android_log_is_loggable_len(int prio, const char* tag, size_t len,
                                  int default_prio);

#if LOG_NDEBUG /* Production */
#define android_testLog(prio, tag) \
    (__android_log_is_loggable_len(prio, tag, (tag && *tag) ? strlen(tag) : 0, \
                                   ANDROID_LOG_DEBUG) != 0)
#else
#define android_testLog(prio, tag) \
    (__android_log_is_loggable_len(prio, tag, (tag && *tag) ? strlen(tag) : 0, \
                                   ANDROID_LOG_VERBOSE) != 0)
#endif

#else

#if LOG_NDEBUG /* Production */
#define android_testLog(prio, tag) \
    (__android_log_is_loggable(prio, tag, ANDROID_LOG_DEBUG) != 0)
#else
#define android_testLog(prio, tag) \
    (__android_log_is_loggable(prio, tag, ANDROID_LOG_VERBOSE) != 0)
#endif

#endif

#else /* __ANDROID_USE_LIBLOG_LOGGABLE_INTERFACE */

#define android_testLog(prio, tag) (1)

#endif /* !__ANDROID_USE_LIBLOG_LOGGABLE_INTERFACE */

#if defined(__clang__)
#pragma clang diagnostic pop
#endif

#ifdef __cplusplus
}
#endif

#endif /* _ANDROID_LOG_H */