3 * Copyright (c) 2012-2020 Samsung Electronics Co., Ltd
5 * Permission is hereby granted, free of charge, to any person obtaining a copy
6 * of this software and associated documentation files (the "Software"), to deal
7 * in the Software without restriction, including without limitation the rights
8 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
9 * copies of the Software, and to permit persons to whom the Software is furnished
10 * to do so, subject to the following conditions:
12 * The above copyright notice and this permission notice shall be included in all
13 * copies or substantial portions of the Software.
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
38 #include <buffer_traits.h>
39 #include "deduplicate.h"
40 #include <dynamic_config.h>
42 #include "logconfig.h"
43 #include "loglimiter.h"
45 #define DEFAULT_CONFIG_LIMITER false
46 #define DEFAULT_CONFIG_PLOG true
47 #define DEFAULT_CONFIG_DEBUGMODE 0
48 #define DEFAULT_CONFIG_LIMITER_APPLY_TO_ALL_BUFFERS 0
51 /* A pseudo-backend that does nothing. Useful for removing the overhead of dlog
52 * for debugging and measurement purposes, also it simplifies some checking as
53 * the `write_to_log` pointer below never needs to be NULL. Note that features
54 * independent of the backend (such as limiter or dynamic config) are controlled
55 * separately if dlog is to be disabled completely and that minimal overhead is
56 * always present (e.g. building the message via vprintf). */
57 static int write_to_log_null (log_id_t log_id, log_priority prio, const char *tag, const char *msg, struct timespec *tp_mono, int32_t pid, int32_t tid)
59 return DLOG_ERROR_NONE;
63 * @brief Points to a function which writes a log message
64 * @details The function pointed to depends on the backend used
65 * @param[in] log_id ID of the buffer to log to. Belongs to (LOG_ID_INVALID, LOG_ID_MAX) non-inclusive
66 * @param[in] prio Priority of the message.
67 * @param[in] tag The message tag, identifies the sender.
68 * @param[in] msg The contents of the message.
69 * @return Returns the number of bytes written on success and a negative error value on error.
70 * @see __dlog_init_backend
72 int (*write_to_log)(log_id_t log_id, log_priority prio, const char *tag, const char *msg, struct timespec *tp_mono, int32_t pid, int32_t tid) = write_to_log_null;
73 void (*destroy_backend)(void);
75 int (*stash_failed_log)(log_id_t log_id, log_priority prio, const char *tag, const char *msg) = NULL;
77 static int stash_critical(log_id_t log_id, log_priority prio, const char *tag, const char *msg);
80 pthread_rwlock_t log_limiter_lock = PTHREAD_RWLOCK_INITIALIZER;
81 static pthread_mutex_t log_construction_lock = PTHREAD_MUTEX_INITIALIZER;
82 static bool is_initialized = false;
84 extern void __dlog_init_pipe(const struct log_config *conf);
85 extern void __dlog_init_android(const struct log_config *conf);
86 extern void __dlog_init_zero_copy();
88 extern void prepend_container_tag_if_in_container(size_t buf_size, char buf[static buf_size], int *len);
91 struct limiter_data *limiter_data;
92 static bool dynamic_config;
93 static bool plog[LOG_ID_MAX];
94 static bool plog_default_values[LOG_ID_MAX];
95 static bool enable_secure_logs = true;
96 static bool enable_critical = true;
98 static bool should_disable_cancels;
100 static int debugmode;
101 static int fatal_assert;
102 static int limiter_apply_to_all_buffers;
103 static _Atomic log_priority priority_filter_level = DLOG_VERBOSE;
105 /* Cache pid and tid to avoid up to two syscalls per log. The update function
106 * is registered to happen when new threads are made (including a full fork). */
107 static int32_t cached_pid = 0;
108 _Thread_local int32_t cached_tid = 0;
110 static inline int32_t get_cached_pid()
112 return (cached_pid = cached_pid ?: getpid());
115 static inline int32_t get_cached_tid()
117 return (cached_tid = cached_tid ?: gettid());
120 static void update_thread_local_ids(void)
126 /* Here, static_config is the original config from /etc/dlog.conf{,.d} which can be overriden,
127 * but comes back if the override is removed. both_config additionally contains dynamic rules
128 * (by default from /run/dlog/filters.d) which can be changed in the runtime.
129 * The static_config has to be kept separately, so that we can go back to it when dynamic rules change.
130 * Note that most functions only use static_config, since the parameters can't be changed in runtime. */
131 static void __configure_limiter(struct log_config *static_config, struct log_config *both_config)
133 assert(static_config);
140 limiter_data = __log_limiter_create(static_config);
141 if (limiter_data && dynamic_config)
142 __log_limiter_update(limiter_data, both_config);
143 limiter = (bool)limiter_data;
145 should_disable_cancels |= limiter; // due to locks
148 static int __configure_backend(struct log_config *config)
152 const char *const backend = log_config_claim_backend(config);
156 if (!strcmp(backend, "pipe")) {
157 __dlog_init_pipe(config);
158 should_disable_cancels = true;
159 } else if (!strcmp(backend, "logger"))
160 __dlog_init_android(config);
161 else if (!strcmp(backend, "zero-copy"))
162 __dlog_init_zero_copy(config);
163 else if (!strcmp(backend, "null"))
164 ; // already the default
171 static void __set_plog_default_values(void)
173 for (size_t i = 0; i < NELEMS(plog); ++i)
174 plog_default_values[i] = plog[i];
177 static void __initialize_plog(const struct log_config *config)
181 const bool plog_default = log_config_get_boolean(config, "plog", DEFAULT_CONFIG_PLOG);
182 for (size_t i = 0; i < NELEMS(plog); ++i)
183 plog[i] = plog_default;
184 plog[LOG_ID_APPS] = true; // the default does not apply here for backward compatibility reasons.
185 __set_plog_default_values();
188 static void __configure_parameters(struct log_config *static_config, struct log_config *both_config)
190 assert(static_config);
193 __initialize_plog(static_config);
194 __update_plog(static_config);
195 /* Like in __configure_limiter, we also check the dynamic rules. However, we make sure to
196 * set the default values to the ones generated by the static rules first. */
197 __set_plog_default_values();
198 __update_plog(both_config);
200 enable_secure_logs = log_config_get_boolean(both_config, "enable_secure_logs", enable_secure_logs);
201 enable_critical = log_config_get_boolean(both_config, "enable_critical", enable_critical);
202 debugmode = log_config_get_int(both_config, "debugmode", DEFAULT_CONFIG_DEBUGMODE);
203 fatal_assert = access(DEBUGMODE_FILE, F_OK) != -1;
204 limiter = log_config_get_boolean(both_config, "limiter", DEFAULT_CONFIG_LIMITER);
205 limiter_apply_to_all_buffers = log_config_get_int(both_config,
206 "limiter_apply_to_all_buffers",
207 DEFAULT_CONFIG_LIMITER_APPLY_TO_ALL_BUFFERS);
209 stash_failed_log = NULL;
210 const char *stash_failed_log_method = log_config_get(both_config, "stash_failed_log_method");
211 if (stash_failed_log_method) {
213 if (strcmp(stash_failed_log_method, "critical") == 0)
214 stash_failed_log = stash_critical;
219 void __update_plog(const struct log_config *conf)
223 for (size_t i = 0; i < NELEMS(plog); ++i) {
224 char key[MAX_CONF_KEY_LEN];
225 const int r = snprintf(key, sizeof key, "enable_%s", log_name_by_id((log_id_t)i));
228 plog[i] = log_config_get_boolean(conf, key, plog_default_values[i]);
233 * @brief Configure the library
234 * @details Reads relevant config values
235 * @remarks This is more or less a constructor, but there are some obstacles
236 * to using it as such (i.e. with attribute constructor):
238 * - some important pieces of the system link to dlog, they start very early
239 * such that dlog can't properly initialize (which lasts for program lifetime)
240 * but don't actually log anything until later on and would be fine under lazy
241 * initialisation. The way to do it "properly" would be to expose this function
242 * into the API so that people can manually call it when they're ready, but
243 * one of the design goals of the current API is that it requires absolutely no
244 * other calls than `dlog_print`. Changing it would require somebody with a
245 * bird's eye view of the system to produce a design so I wouldn't count on it.
247 * - the constructor would need to have as high of a priority as possible (so as
248 * to minimize the risk of another library's constructor using uninitialized data)
249 * but at the same time others might want some room to wrap functions before
250 * dlog uses them (think mprobe/mcheck). This would also require a design pass.
255 bool __configure(void)
257 __attribute__((cleanup(log_config_free))) struct log_config static_config = {};
258 __attribute__((cleanup(log_config_free))) struct log_config both_config = {};
260 if (log_config_read(&static_config) < 0)
262 log_config_copy(&both_config, &static_config);
264 dynamic_config = __dynamic_config_create(&both_config);
266 __configure_parameters(&static_config, &both_config);
268 if (!__configure_backend(&both_config)) {
269 __dynamic_config_destroy();
270 dynamic_config = false;
274 __configure_deduplicate(&both_config);
275 __configure_limiter(&static_config, &both_config);
277 /* The fork handler also runs when a new thread is made (not just
278 * when the whole process forks), so we can cache both pid and tid. */
279 pthread_atfork(NULL, NULL, update_thread_local_ids);
284 static void __attribute__((constructor(101))) __install_pipe_handler(void)
286 /* We mask SIGPIPE signal because most applications do not install their
287 * own SIGPIPE handler. Default behaviour in SIGPIPE case is to abort the
288 * process. SIGPIPE occurs when e.g. dlog daemon closes read pipe endpoint.
290 * We do this in the library constructor (at maximum priority) and not
291 * during regular (lazy) initialisation so as to prevent overwriting the
292 * program's actual signal handler, if it has one.
294 * In theory this is not required for the Android logger backend; however,
295 * this early we don't yet know the backend and also it is good to behave
296 * consistently in this regard anyway.
298 * We don't revert this in a destructor because Unix signals are bonkers
299 * and we have no way to do this cleanly. Most libdlog users don't use
300 * runtime linking so this would mostly done at program exit either way. */
301 signal(SIGPIPE, SIG_IGN);
304 static void __attribute__((constructor(102))) __set_output_buffering(void)
306 /* If stdout and/or stderr is redirected to dlog (service, driver)
307 * it is best if we buffer lines, otherwise the following can happen:
308 * - no buffering: service/driver recives every single byte (precisely
309 * every single write*(2) call), causing it to either buffer the data
310 * anyway (service), or print logs at random places (driver)
311 * - full buffering: service/driver receives several hundred lines,
312 * which results in one giant entry being added (driver) or long delays
313 * before logs appear (service) */
314 if (getenv(DLOG_ENV_STDOUT_LINE_BUFFERED))
317 if (getenv(DLOG_ENV_STDERR_LINE_BUFFERED))
321 static bool first = true;
322 static bool initialize(void)
327 /* The mutex acts as a barrier, but otherwise the C language's
328 * machine abstraction is single-threaded. This means that the
329 * compiler is free to rearrange calls inside the mutex according
330 * to the as-if rule because it doesn't care if another thread can
331 * access it in parallel. In particular, `is_initialized = true`
332 * directly after `__configure()` could be rearranged to go in
333 * front of it because it is not touched inside that function
334 * if the compiler thinks it helps somehow (not unlikely: since
335 * it is checked before the mutex, it is very probable for it to
336 * still be in the CPU register or something like that). On top
337 * of that, some architectures (in particular, armv7l) don't have
338 * strict memory guarantees and can reorder actual memory stores
339 * on their own, even if the compiler didn't do anything fancy
340 * when creating machine code. For more info about the issue,
341 * see https://www.aristeia.com/Papers/DDJ_Jul_Aug_2004_revised.pdf
343 * Ultimately this means that there needs to be some sort of
344 * barrier between `__configure` and `is_initialized = true`,
345 * and the simplest way to achieve that is to just wait until
346 * the second entry into the mutex. */
349 pthread_mutex_lock(&log_construction_lock);
351 first = !__configure();
353 is_initialized = true;
355 pthread_mutex_unlock(&log_construction_lock);
360 * @brief Fatal assertion
361 * @details Conditionally crash the sucka who sent the log
362 * @param[in] prio Priority of the log
364 static void __dlog_fatal_assert(int prio)
366 assert(!fatal_assert || (prio != DLOG_FATAL));
370 * @brief Check log validity
371 * @details Checks whether the log is valid and eligible for printing
372 * @param[in] log_id The target buffer ID
373 * @param[in] prio The log's priority
374 * @param[in] tag The log's tag
375 * @return DLOG_ERROR_NONE on success, else an error code.
376 * @retval DLOG_ERROR_INVALID_PARAMETER Invalid parameter
378 static int dlog_check_validity(log_id_t log_id, int prio, const char *tag)
382 return DLOG_ERROR_INVALID_PARAMETER;
384 if (log_id <= LOG_ID_INVALID || LOG_ID_MAX <= log_id)
385 return DLOG_ERROR_INVALID_PARAMETER;
387 return DLOG_ERROR_NONE;
391 * @brief Check log against limiter rules
392 * @details Checks whether the log passes current limiter rules
393 * @param[in] log_id The target buffer ID
394 * @param[in] prio The log's priority
395 * @param[in] tag The log's tag
396 * @return DLOG_ERROR_NONE on success, else an error code.
397 * @retval DLOG_ERROR_NOT_PERMITTED Not permitted
399 static int dlog_check_limiter(log_id_t log_id, int prio, const char *tag)
401 if (!debugmode && prio <= DLOG_DEBUG)
402 return DLOG_ERROR_NOT_PERMITTED;
405 __dynamic_config_update(limiter_data);
408 struct pass_log_result should_log = { .decision = DECISION_DENIED };
410 /* Since the only `wrlock` is done by the dynamic config, we can avoid
411 * the `rdlock` entirely if the config is static. This sounds unsafe
412 * but lets us save an entire syscall, which is a lot (both comparatively
413 * and because it compounds). */
414 if (!dynamic_config || !pthread_rwlock_rdlock(&log_limiter_lock)) {
415 should_log = __log_limiter_pass_log_pid(limiter_data, tag, prio, get_cached_pid());
417 pthread_rwlock_unlock(&log_limiter_lock);
420 switch (should_log.decision) {
421 case DECISION_DENIED:
422 return DLOG_ERROR_NOT_PERMITTED;
424 case DECISION_TAG_LIMIT_EXCEEDED_MESSAGE:
425 case DECISION_PID_LIMIT_EXCEEDED_MESSAGE: {
427 int result = clock_gettime(CLOCK_MONOTONIC, &tp);
429 return DLOG_ERROR_NOT_PERMITTED;
431 snprintf(buf, sizeof(buf),
432 "Your log has been blocked due to per-%s limit of %d logs per %d seconds.",
433 should_log.decision == DECISION_TAG_LIMIT_EXCEEDED_MESSAGE ? "tag" : "PID",
434 should_log.logs_per_period, should_log.period_s);
435 write_to_log(log_id, prio, tag, buf, &tp, get_cached_pid(), get_cached_tid());
436 return DLOG_ERROR_NOT_PERMITTED;
439 case DECISION_ALLOWED:
444 /* This can change due to __dynamic_config_update(), but is atomic and its
445 * value implies nothing else so does not need to be under a lock. */
447 return DLOG_ERROR_NOT_PERMITTED;
449 return DLOG_ERROR_NONE;
452 static int __write_to_log_critical_section(log_id_t log_id, int prio, const char *tag, const char *fmt, va_list ap, bool check_should_log)
454 if ((check_should_log || limiter_apply_to_all_buffers) && (dlog_check_limiter(log_id, prio, tag) < 0))
455 return DLOG_ERROR_NONE;
457 char buf[LOG_MAX_PAYLOAD_SIZE];
458 int len = vsnprintf(buf, sizeof buf, fmt, ap);
460 return DLOG_ERROR_NONE;
461 else if (len >= sizeof buf)
462 len = sizeof buf - 1;
464 // Temporary workaround, see temporary.c
465 prepend_container_tag_if_in_container(sizeof buf, buf, &len);
469 if (deduplicate_func && !clock_gettime(CLOCK_MONOTONIC, &tp)) {
470 dlog_deduplicate_e ret = deduplicate_func(buf, len, &tp);
471 if (ret == DLOG_DEDUPLICATE)
472 return DLOG_ERROR_NONE;
473 else if (ret == DLOG_DO_NOT_DEDUPLICATE_BUT_WARN)
474 deduplicate_warn(buf, sizeof buf, len);
475 r = write_to_log(log_id, prio, tag, buf, &tp, get_cached_pid(), get_cached_tid());
477 r = write_to_log(log_id, prio, tag, buf, NULL, get_cached_pid(), get_cached_tid());
479 if (r < 0 && stash_failed_log)
480 r = stash_failed_log(log_id, prio, tag, buf);
485 static int __write_to_log(log_id_t log_id, int prio, const char *tag, const char *fmt, va_list ap, bool check_should_log, bool secure_log)
487 int ret = dlog_check_validity(log_id, prio, tag);
491 if (check_should_log && prio < priority_filter_level)
492 return DLOG_ERROR_NONE;
494 /* Threads can be cancelled before they give up a lock.
495 * Therefore cancellation is temporarily disabled as
496 * long as the current set of features uses a lock.
498 * This solution is comparatively simple and cheap.
499 * The other solutions (cleanup handlers, robust mutexes)
500 * would be much more complicated and also inflict larger
501 * runtime costs. The downside of disabling cancellation
502 * is not a problem in our case because it is temporary
503 * and very brief so we don't keep an obsolete thread
504 * for much longer than we otherwise would. */
505 int old_cancel_state;
506 if (should_disable_cancels)
507 pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &old_cancel_state);
510 // TODO: We could consider stashing the failed log here
511 ret = DLOG_ERROR_NOT_PERMITTED;
512 else if (secure_log && !enable_secure_logs)
515 ret = __write_to_log_critical_section(log_id, prio, tag, fmt, ap, check_should_log);
517 if (should_disable_cancels)
518 pthread_setcancelstate(old_cancel_state, NULL);
523 int __critical_log_append_timestamp(char *buf, size_t buflen)
525 /* NB: the timestamp may slightly differ from the one that gets
526 * added onto the copy that goes into the regular buffer, and
527 * timestamp acquisition is duplicated. This would ideally be
528 * solved, but timestamps are currently added fairly deep in
529 * backend-specific functions so for now this will have to do.
530 * Also, since we're the sender, there is just this one set of
531 * timestamps, i.e. the send timestamp! The usual alternative
532 * set of receive timestamps will never have the opportunity
533 * to get added to the entry since this log is supposed to end
534 * up straight in the file (there's potentially the trusted
535 * writer binary but we're trying to keep the set of actions
536 * it needs to do to the minimum and those timestamps would
537 * in practice be the same anyway). */
540 clock_gettime(CLOCK_REALTIME, &ts);
541 const time_t tt = ts.tv_sec;
542 const long int real_millisec = ts.tv_nsec / 1000000;
543 clock_gettime(CLOCK_MONOTONIC, &ts);
545 struct tm *const ptm = localtime_r(&tt, &tmBuf);
546 assert(ptm); // we're in a short lived fork so asserts are fine and make things simple
548 int len = strftime(buf, buflen, "%m-%d %H:%M:%S", ptm);
551 int tmp_len = snprintf(buf + len, buflen - len, ".%03ld", real_millisec);
553 assert(tmp_len < buflen - len);
556 tmp_len = strftime(buf + len, buflen - len, "%z ", ptm);
557 assert(tmp_len != 0);
560 tmp_len = snprintf(buf + len, buflen - len, "%5lu.%03ld", ts.tv_sec, ts.tv_nsec / 1000000);
562 assert(tmp_len < buflen - len);
568 int __critical_log_build_msg(char *buf, size_t buflen, pid_t main_pid, pid_t main_tid, log_id_t log_id, int prio, const char *tag, const char *fmt, va_list ap)
570 int len = __critical_log_append_timestamp(buf, buflen);
571 const int metadata_len = snprintf(buf + len, buflen - len, " P%5d T%5d B%-6s %c/%-8s: ",
574 log_name_by_id(log_id),
575 filter_pri_to_char(prio),
576 tag ?: "CRITICAL_NO_TAG");
577 assert(metadata_len > 0);
578 if (metadata_len >= buflen - len)
579 return buflen - 1; // can genuinely happen with an exceedingly large tag
582 const int content_len = vsnprintf(buf + len, buflen - len, fmt, ap);
583 assert(content_len >= 0); // 0 is legit with format == ""
584 if (content_len >= buflen - len)
592 __attribute__ ((noreturn))
594 void __critical_log_child(pid_t main_pid, pid_t main_tid, log_id_t log_id, int prio, const char *tag, const char *fmt, va_list ap)
596 char buf[LOG_MAX_PAYLOAD_SIZE + 128]; // extra space for some metadata
597 const int len = __critical_log_build_msg(buf, sizeof buf - 1, main_pid, main_tid, log_id, prio, tag, fmt, ap);
601 static const char *const path = "/usr/libexec/dlog-log-critical";
602 execl(path, path /* argv[0] convention */, buf, (char *) NULL);
605 /* Compilers are sometimes smart enough to recognize _exit's
606 * noreturn attribute, even if we wrap it with something that
607 * returns. This causes it to behave in unexpected ways, for
608 * example it can blow up the program regardless or it can
609 * optimize some conditionals out (and incorrectly enter them
610 * after the exit call fails to actually exit). This makes it
611 * unsuitable for tests. */
613 _exit(1); // not the regular `exit` so as not to trigger any `atexit` handlers prematurely
617 #ifndef UNIT_TEST // contains forks and exits, these don't work well with wrapping (see above)
618 void __critical_log(log_id_t log_id, int prio, const char *tag, const char *fmt, va_list ap)
620 /* Critical log functionality is mostly done in a separate binary
621 * to handle security correctly (else every process would have to
622 * possess the necessary privilege to write onto that file, which
623 * would be opening a fairly nasty can of worms from the security
624 * point of view). Our use of exec() is why a simple thread would
625 * not suffice and we're resorting to a fork.
627 * The double fork, much like a double barreled 12 gauge shotgun,
628 * is an elegant solution designed to stop a zombie army. We'd be
629 * creating zombie processes if we didn't wait() for the children
630 * we spawn, but we don't really want to do that since it results
631 * in a needless delay. Instead, the writer process is actually a
632 * grandchild, with our direct child exiting immediately just for
633 * us to have something to wait on that is guaranteed not to take
634 * too long. The orphaned grandchild is adopted by init, who will
635 * take care to reap it when it dies. In addition to avoiding the
636 * delay, the client will not have any unexpected children (which
637 * could ruin logic in its own waits).
640 * ┌───────┐ ┌─────────┐ ┌─────────────┐ ┌────────┐
641 * │ pid 1 ├──>│ libdlog ├──>│ immediately ├──>│ execs │
642 * │ init │ │ client │ │ exits │ │ writer │
643 * └───────┘ └─────────┘ └─────────────┘ └────────┘
645 * Afterwards, libdlog has no children:
646 * ┌───────┐ ┌─────────┐ ┌────────┐
647 * │ pid 1 ├──>│ libdlog │ ┌─────────>│ writer │
648 * │ init ├─┐ │ client │ │ │ binary │
649 * └───────┘ │ └─────────┘ │ └────────┘
650 * └──────────────────────┘
655 if (!enable_critical)
658 const pid_t main_pid = getpid();
659 const pid_t main_tid = gettid();
661 const int temporary_exiter_pid = fork();
662 if (temporary_exiter_pid < 0)
664 if (temporary_exiter_pid != 0) {
665 waitpid(temporary_exiter_pid, NULL, 0);
669 const int child_pid = fork();
675 __critical_log_child(main_pid, main_tid, log_id, prio, tag, fmt, ap);
678 static void stash_critical_inner(log_id_t log_id, log_priority prio, const char *tag, const char *fmt, ...)
683 __critical_log(log_id, prio, tag, fmt, ap);
687 static int stash_critical(log_id_t log_id, log_priority prio, const char *tag, const char *msg)
689 stash_critical_inner(log_id, prio, tag, "FAILED TO LOG: %s", msg);
693 EXPORT_API int __dlog_critical_print(log_id_t log_id, int prio, const char *tag, const char *fmt, ...)
698 __critical_log(log_id, prio, tag, fmt, ap);
702 int ret = __dlog_vprint(log_id, prio, tag, fmt, ap);
709 EXPORT_API int dlog_set_minimum_priority(int priority)
711 if (priority < DLOG_DEFAULT || priority > DLOG_PRIO_MAX)
712 return DLOG_ERROR_INVALID_PARAMETER;
714 priority_filter_level = priority;
715 return DLOG_ERROR_NONE;
720 * @details Print a log line
721 * @param[in] log_id The target buffer ID
722 * @param[in] prio Priority
724 * @param[in] fmt Format (same as printf)
725 * @param[in] ap Argument list
726 * @return Bytes written, or negative error
728 EXPORT_API int __dlog_vprint(log_id_t log_id, int prio, const char *tag, const char *fmt, va_list ap)
730 int ret = __write_to_log(log_id, prio, tag, fmt, ap, true, false);
731 __dlog_fatal_assert(prio);
738 * @details Print a log line
739 * @param[in] log_id The target buffer ID
740 * @param[in] prio Priority
742 * @param[in] fmt Format (same as printf)
743 * @return Bytes written, or negative error
745 EXPORT_API int __dlog_print(log_id_t log_id, int prio, const char *tag, const char *fmt, ...)
750 int ret = __dlog_vprint(log_id, prio, tag, fmt, ap);
758 * @details Print a log line
759 * @param[in] log_id The target buffer ID
760 * @param[in] prio Priority
762 * @param[in] fmt Format (same as printf)
763 * @return Bytes written, or negative error
765 EXPORT_API int __dlog_sec_print(log_id_t log_id, int prio, const char *tag, const char *fmt, ...)
767 if (!enable_secure_logs)
773 int ret = __write_to_log(log_id, prio, tag, fmt, ap, true, true);
774 __dlog_fatal_assert(prio);
780 EXPORT_API int dlog_vprint(log_priority prio, const char *tag, const char *fmt, va_list ap)
782 return __write_to_log(LOG_ID_APPS, prio, tag, fmt, ap, false, false);
785 EXPORT_API int dlog_print(log_priority prio, const char *tag, const char *fmt, ...)
790 int ret = dlog_vprint(prio, tag, fmt, ap);
797 * @brief Finalize DLog
798 * @details Finalizes and deallocates the library
799 * @notes Used directly in tests; brings back the pre-init state
801 void __dlog_fini(void)
803 if (destroy_backend) {
805 destroy_backend = NULL;
807 write_to_log = write_to_log_null;
808 stash_failed_log = NULL;
809 is_initialized = false;
812 enable_secure_logs = true;
813 enable_critical = false;
814 __deduplicate_destroy();
815 __log_limiter_destroy(limiter_data);
817 __dynamic_config_destroy();
818 should_disable_cancels = false;