1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: t -*-
3 * Copyright (c) 2005-2008, The Android Open Source Project
4 * Copyright (c) 2012-2013 Samsung Electronics Co., Ltd.
6 * Licensed under the Apache License, Version 2.0 (the License);
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
10 * http://www.apache.org/licenses/LICENSE-2.0
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
30 #include <dynamic_config.h>
32 #include <logcommon.h>
33 #include "logconfig.h"
34 #include "loglimiter.h"
36 #define DEFAULT_CONFIG_LIMITER false
37 #define DEFAULT_CONFIG_PLOG true
38 #define DEFAULT_CONFIG_DEBUGMODE 0
39 #define DEFAULT_CONFIG_LIMITER_APPLY_TO_ALL_BUFFERS 0
41 static int __write_to_log_null(log_id_t, log_priority, const char *, const char *);
44 * @brief Points to a function which writes a log message
45 * @details The function pointed to depends on the backend used
46 * @param[in] log_id ID of the buffer to log to. Belongs to (LOG_ID_INVALID, LOG_ID_MAX) non-inclusive
47 * @param[in] prio Priority of the message.
48 * @param[in] tag The message tag, identifies the sender.
49 * @param[in] msg The contents of the message.
50 * @return Returns the number of bytes written on success and a negative error value on error.
51 * @see __dlog_init_backend
53 int (*write_to_log)(log_id_t log_id, log_priority prio, const char *tag, const char *msg) = __write_to_log_null;
54 pthread_mutex_t log_init_lock = PTHREAD_MUTEX_INITIALIZER;
55 extern void __dlog_init_pipe(const struct log_config *conf);
56 extern void __dlog_init_android(const struct log_config *conf);
60 bool plog[LOG_ID_MAX];
61 bool plog_default_values[LOG_ID_MAX];
64 static int fatal_assert;
65 static int limiter_apply_to_all_buffers;
69 * @details Ignores a log
70 * @param[in] log_id ID of the buffer to log to. Belongs to (LOG_ID_INVALID, LOG_ID_MAX) non-inclusive
71 * @param[in] prio Priority of the message.
72 * @param[in] tag The message tag, identifies the sender.
73 * @param[in] msg The contents of the message.
74 * @return DLOG_ERROR_NOT_PERMITTED
76 static int __write_to_log_null(log_id_t log_id, log_priority prio, const char *tag, const char *msg)
78 return DLOG_ERROR_NOT_PERMITTED;
81 static void __configure_limiter(struct log_config *config)
88 limiter = __log_limiter_create(config);
91 static int __configure_backend(struct log_config *config)
95 const char *const backend = log_config_get(config, "backend");
99 if (!strcmp(backend, "pipe"))
100 __dlog_init_pipe(config);
101 else if (!strcmp(backend, "logger"))
102 __dlog_init_android(config);
109 static void __set_plog_default_values()
111 for (int i = 0; i < NELEMS(plog); ++i)
112 plog_default_values[i] = plog[i];
115 static void __initialize_plog(const struct log_config *config)
119 const bool plog_default = log_config_get_boolean(config, "plog", DEFAULT_CONFIG_PLOG);
120 for (int i = 0; i < NELEMS(plog); ++i)
121 plog[i] = plog_default;
122 plog[LOG_ID_APPS] = true; // the default does not apply here for backward compatibility reasons.
123 __set_plog_default_values();
126 static void __configure_parameters(struct log_config *config)
130 __initialize_plog(config);
131 __update_plog(config);
132 __set_plog_default_values();
134 debugmode = log_config_get_int(config, "debugmode", DEFAULT_CONFIG_DEBUGMODE);
135 fatal_assert = access(DEBUGMODE_FILE, F_OK) != -1;
136 limiter = log_config_get_boolean(config, "limiter", DEFAULT_CONFIG_LIMITER);
137 limiter_apply_to_all_buffers = log_config_get_int(config,
138 "limiter_apply_to_all_buffers",
139 DEFAULT_CONFIG_LIMITER_APPLY_TO_ALL_BUFFERS);
142 void __update_plog(const struct log_config *conf)
146 for (int i = 0; i < NELEMS(plog); ++i) {
147 char key[MAX_CONF_KEY_LEN];
148 const int r = snprintf(key, sizeof key, "enable_%s", log_name_by_id((log_id_t)i));
151 plog[i] = log_config_get_boolean(conf, key, plog_default_values[i]);
156 * @brief Configure the library
157 * @details Reads relevant config values
159 static void __configure(void)
161 struct log_config config;
163 if (log_config_read(&config) < 0)
166 dynamic_config = __dynamic_config_create(&config);
168 __configure_parameters(&config);
170 if (!__configure_backend(&config))
173 __configure_limiter(&config);
176 log_config_free(&config);
182 * @details Initializes the library
184 static bool is_initialized = false;
185 static inline void __dlog_init(void)
190 pthread_mutex_lock(&log_init_lock);
192 if (!is_initialized) {
194 is_initialized = true;
197 pthread_mutex_unlock(&log_init_lock);
201 * @brief Fatal assertion
202 * @details Conditionally crash the sucka who sent the log
203 * @param[in] prio Priority of the log
205 static void __dlog_fatal_assert(int prio)
207 assert(!fatal_assert || (prio != DLOG_FATAL));
211 * @brief Check log validity
212 * @details Checks whether the log is valid and eligible for printing
213 * @param[in] log_id The target buffer ID
214 * @param[in] prio The log's priority
215 * @param[in] tag The log's tag
216 * @return DLOG_ERROR_NONE on success, else an error code.
217 * @retval DLOG_ERROR_INVALID_PARAMETER Invalid parameter
219 static int dlog_check_validity(log_id_t log_id, int prio, const char *tag)
222 return DLOG_ERROR_INVALID_PARAMETER;
224 if (log_id <= LOG_ID_INVALID || LOG_ID_MAX <= log_id)
225 return DLOG_ERROR_INVALID_PARAMETER;
227 return DLOG_ERROR_NONE;
231 * @brief Check log against limiter rules
232 * @details Checks whether the log passes current limiter rules
233 * @param[in] log_id The target buffer ID
234 * @param[in] prio The log's priority
235 * @param[in] tag The log's tag
236 * @return DLOG_ERROR_NONE on success, else an error code.
237 * @retval DLOG_ERROR_NOT_PERMITTED Not permitted
239 static int dlog_check_limiter(log_id_t log_id, int prio, const char *tag)
241 if (!debugmode && prio <= DLOG_DEBUG)
242 return DLOG_ERROR_NOT_PERMITTED;
245 __dynamic_config_update();
248 pthread_mutex_lock(&log_init_lock);
249 int should_log = __log_limiter_pass_log(tag, prio);
250 pthread_mutex_unlock(&log_init_lock);
253 return DLOG_ERROR_NOT_PERMITTED;
254 } else if (should_log < 0) {
255 write_to_log(log_id, prio, tag,
256 "Your log has been blocked due to limit of log lines per minute.");
257 return DLOG_ERROR_NOT_PERMITTED;
262 return DLOG_ERROR_NOT_PERMITTED;
264 return DLOG_ERROR_NONE;
267 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)
269 char buf[LOG_MAX_PAYLOAD_SIZE];
271 int ret = dlog_check_validity(log_id, prio, tag);
277 /* if limiter_apply_to_all_buffers config variable is set to 1,
278 * check_should_log value does not matter and the entry is always
279 * tested against all conditions, i.e. limiter rules
281 ret = (check_should_log || limiter_apply_to_all_buffers) ? dlog_check_limiter(log_id, prio, tag) : 0;
284 return DLOG_ERROR_NONE;
286 vsnprintf(buf, sizeof buf, fmt, ap);
288 return write_to_log(log_id, prio, tag, buf);
293 * @details Print a log line
294 * @param[in] log_id The target buffer ID
295 * @param[in] prio Priority
297 * @param[in] fmt Format (same as printf)
298 * @param[in] ap Argument list
299 * @return Bytes written, or negative error
301 int __dlog_vprint(log_id_t log_id, int prio, const char *tag, const char *fmt, va_list ap)
303 int ret = __write_to_log(log_id, prio, tag, fmt, ap, true);
304 __dlog_fatal_assert(prio);
311 * @details Print a log line
312 * @param[in] log_id The target buffer ID
313 * @param[in] prio Priority
315 * @param[in] fmt Format (same as printf)
316 * @return Bytes written, or negative error
318 int __dlog_print(log_id_t log_id, int prio, const char *tag, const char *fmt, ...)
323 int ret = __dlog_vprint(log_id, prio, tag, fmt, ap);
329 int dlog_vprint(log_priority prio, const char *tag, const char *fmt, va_list ap)
331 return __write_to_log(LOG_ID_APPS, prio, tag, fmt, ap, false);
334 int dlog_print(log_priority prio, const char *tag, const char *fmt, ...)
339 int ret = dlog_vprint(prio, tag, fmt, ap);
347 * @brief Finalize DLog
348 * @details Finalizes and deallocates the library
349 * @notes Used in tests only
351 void __dlog_fini(void)
353 __log_limiter_destroy();
354 __dynamic_config_destroy();
355 write_to_log = __write_to_log_null;
356 is_initialized = false;