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.
24 #include <dynamic_config.h>
25 #include <logcommon.h>
26 #include "loglimiter.h"
27 #include "logconfig.h"
31 #define DEFAULT_CONFIG_LIMITER false
32 #define DEFAULT_CONFIG_PLOG true
33 #define DEFAULT_CONFIG_DEBUGMODE 0
34 #define DEFAULT_CONFIG_LIMITER_APPLY_TO_ALL_BUFFERS 0
37 * @brief Points to a function which writes a log message
38 * @details The function pointed to depends on the backend used
39 * @param[in] log_id ID of the buffer to log to. Belongs to (LOG_ID_INVALID, LOG_ID_MAX) non-inclusive
40 * @param[in] prio Priority of the message.
41 * @param[in] tag The message tag, identifies the sender.
42 * @param[in] msg The contents of the message.
43 * @return Returns the number of bytes written on success and a negative error value on error.
44 * @see __dlog_init_backend
46 int (*write_to_log)(log_id_t log_id, log_priority prio, const char *tag, const char *msg) = NULL;
47 pthread_mutex_t log_init_lock = PTHREAD_MUTEX_INITIALIZER;
48 extern void __dlog_init_pipe(const struct log_config *conf);
49 extern void __dlog_init_android(const struct log_config *conf);
53 bool plog[LOG_ID_MAX];
54 bool plog_default_values[LOG_ID_MAX];
56 void __update_plog(const struct log_config *conf);
59 static int fatal_assert;
60 static int limiter_apply_to_all_buffers;
62 static void __configure_limiter(struct log_config *config)
69 limiter = __log_limiter_create(config);
72 static int __configure_backend(struct log_config *config)
76 const char *const backend = log_config_get(config, "backend");
80 if (!strcmp(backend, "pipe"))
81 __dlog_init_pipe(config);
82 else if (!strcmp(backend, "logger"))
83 __dlog_init_android(config);
90 static void __set_plog_default_values()
92 for (int i = 0; i < NELEMS(plog); ++i)
93 plog_default_values[i] = plog[i];
96 static void __initialize_plog(const struct log_config *config)
100 const bool plog_default = log_config_get_boolean(config, "plog", DEFAULT_CONFIG_PLOG);
101 for (int i = 0; i < NELEMS(plog); ++i)
102 plog[i] = plog_default;
103 plog[LOG_ID_APPS] = true; // the default does not apply here for backward compatibility reasons.
104 __set_plog_default_values();
107 static void __configure_parameters(struct log_config *config)
111 __initialize_plog(config);
112 __update_plog(config);
113 __set_plog_default_values();
115 debugmode = log_config_get_int(config, "debugmode", DEFAULT_CONFIG_DEBUGMODE);
116 fatal_assert = access(DEBUGMODE_FILE, F_OK) != -1;
117 limiter = log_config_get_boolean(config, "limiter", DEFAULT_CONFIG_LIMITER);
118 limiter_apply_to_all_buffers = log_config_get_int(config,
119 "limiter_apply_to_all_buffers",
120 DEFAULT_CONFIG_LIMITER_APPLY_TO_ALL_BUFFERS);
123 void __update_plog(const struct log_config *conf)
127 for (int i = 0; i < NELEMS(plog); ++i) {
128 char key[MAX_CONF_KEY_LEN];
129 const int r = snprintf(key, sizeof key, "enable_%s", log_name_by_id((log_id_t)i));
132 plog[i] = log_config_get_boolean(conf, key, plog_default_values[i]);
137 * @brief Configure the library
138 * @details Reads relevant config values
141 void __configure(void)
143 static void __attribute__((constructor)) __configure(void)
146 struct log_config config;
148 if (log_config_read(&config) < 0)
151 dynamic_config = __dynamic_config_create(&config);
153 __configure_parameters(&config);
155 if (!__configure_backend(&config))
158 __configure_limiter(&config);
161 log_config_free(&config);
166 * @brief Fatal assertion
167 * @details Conditionally crash the sucka who sent the log
168 * @param[in] prio Priority of the log
170 static void __dlog_fatal_assert(int prio)
172 assert(!fatal_assert || (prio != DLOG_FATAL));
176 * @brief Check log validity
177 * @details Checks whether the log is valid and eligible for printing
178 * @param[in] log_id The target buffer ID
179 * @param[in] prio The log's priority
180 * @param[in] tag The log's tag
181 * @return DLOG_ERROR_NONE on success, else an error code.
182 * @retval DLOG_ERROR_INVALID_PARAMETER Invalid parameter
184 static int dlog_check_validity(log_id_t log_id, int prio, const char *tag)
187 return DLOG_ERROR_INVALID_PARAMETER;
189 if (log_id <= LOG_ID_INVALID || LOG_ID_MAX <= log_id)
190 return DLOG_ERROR_INVALID_PARAMETER;
192 return DLOG_ERROR_NONE;
196 * @brief Check log against limiter rules
197 * @details Checks whether the log passes current limiter rules
198 * @param[in] log_id The target buffer ID
199 * @param[in] prio The log's priority
200 * @param[in] tag The log's tag
201 * @return DLOG_ERROR_NONE on success, else an error code.
202 * @retval DLOG_ERROR_NOT_PERMITTED Not permitted
204 static int dlog_check_limiter(log_id_t log_id, int prio, const char *tag)
206 if (!debugmode && prio <= DLOG_DEBUG)
207 return DLOG_ERROR_NOT_PERMITTED;
210 __dynamic_config_update();
213 pthread_mutex_lock(&log_init_lock);
214 int should_log = __log_limiter_pass_log(tag, prio);
215 pthread_mutex_unlock(&log_init_lock);
218 return DLOG_ERROR_NOT_PERMITTED;
219 } else if (should_log < 0) {
220 write_to_log(log_id, prio, tag,
221 "Your log has been blocked due to limit of log lines per minute.");
222 return DLOG_ERROR_NOT_PERMITTED;
227 return DLOG_ERROR_NOT_PERMITTED;
229 return DLOG_ERROR_NONE;
232 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)
234 char buf[LOG_MAX_PAYLOAD_SIZE];
236 int ret = dlog_check_validity(log_id, prio, tag);
241 return DLOG_ERROR_NOT_PERMITTED;
243 /* if limiter_apply_to_all_buffers config variable is set to 1,
244 * check_should_log value does not matter and the entry is always
245 * tested against all conditions, i.e. limiter rules
247 ret = (check_should_log || limiter_apply_to_all_buffers) ? dlog_check_limiter(log_id, prio, tag) : 0;
250 return DLOG_ERROR_NONE;
252 vsnprintf(buf, sizeof buf, fmt, ap);
254 return write_to_log(log_id, prio, tag, buf);
259 * @details Print a log line
260 * @param[in] log_id The target buffer ID
261 * @param[in] prio Priority
263 * @param[in] fmt Format (same as printf)
264 * @param[in] ap Argument list
265 * @return Bytes written, or negative error
267 int __dlog_vprint(log_id_t log_id, int prio, const char *tag, const char *fmt, va_list ap)
269 int ret = __write_to_log(log_id, prio, tag, fmt, ap, true);
270 __dlog_fatal_assert(prio);
277 * @details Print a log line
278 * @param[in] log_id The target buffer ID
279 * @param[in] prio Priority
281 * @param[in] fmt Format (same as printf)
282 * @return Bytes written, or negative error
284 int __dlog_print(log_id_t log_id, int prio, const char *tag, const char *fmt, ...)
289 int ret = __dlog_vprint(log_id, prio, tag, fmt, ap);
295 int dlog_vprint(log_priority prio, const char *tag, const char *fmt, va_list ap)
297 return __write_to_log(LOG_ID_APPS, prio, tag, fmt, ap, false);
300 int dlog_print(log_priority prio, const char *tag, const char *fmt, ...)
305 int ret = dlog_vprint(prio, tag, fmt, ap);
313 * @brief Finalize DLog
314 * @details Finalizes and deallocates the library
315 * @notes Used in tests only
317 void __dlog_fini(void)
319 __log_limiter_destroy();
320 __dynamic_config_destroy();