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 <logcommon.h>
25 #include <log_filters.h>
26 #include "loglimiter.h"
27 #include "logconfig.h"
31 #define DEFAULT_CONFIG_LIMITER 0
32 #define DEFAULT_CONFIG_PLOG 1
33 #define DEFAULT_CONFIG_DEBUGMODE 0
35 static int __write_to_log_null(log_id_t, log_priority, const char *, const char *);
38 * @brief Points to a function which writes a log message
39 * @details The function pointed to depends on the backend used
40 * @param[in] log_id ID of the buffer to log to. Belongs to (LOG_ID_INVALID, LOG_ID_MAX) non-inclusive
41 * @param[in] prio Priority of the message.
42 * @param[in] tag The message tag, identifies the sender.
43 * @param[in] msg The contents of the message.
44 * @return Returns the number of bytes written on success and a negative error value on error.
45 * @see __dlog_init_backend
47 int (*write_to_log)(log_id_t log_id, log_priority prio, const char *tag, const char *msg) = __write_to_log_null;
48 pthread_mutex_t log_init_lock = PTHREAD_MUTEX_INITIALIZER;
49 extern void __dlog_init_pipe();
50 extern void __dlog_init_android();
55 static int fatal_assert;
59 * @details Ignores a log
60 * @param[in] log_id ID of the buffer to log to. Belongs to (LOG_ID_INVALID, LOG_ID_MAX) non-inclusive
61 * @param[in] prio Priority of the message.
62 * @param[in] tag The message tag, identifies the sender.
63 * @param[in] msg The contents of the message.
64 * @return DLOG_ERROR_NOT_PERMITTED
66 static int __write_to_log_null(log_id_t log_id, log_priority prio, const char *tag, const char *msg)// LCOV_EXCL_LINE
68 return DLOG_ERROR_NOT_PERMITTED; // LCOV_EXCL_LINE
71 static void __configure_limiter(struct log_config *config)
78 __dynamic_filters_create(config);
79 limiter = __log_limiter_create(config);
82 __dynamic_filters_destroy();
85 static int __configure_backend(struct log_config *config)
89 const char *const backend = log_config_get(config, "backend");
93 if (!strcmp(backend, "pipe"))
95 else if (!strcmp(backend, "logger"))
96 __dlog_init_android();
103 static void __configure_parameters(struct log_config *config)
107 plog = log_config_get_int(config, "plog", DEFAULT_CONFIG_PLOG);
108 debugmode = log_config_get_int(config, "debugmode", DEFAULT_CONFIG_DEBUGMODE);
109 fatal_assert = access(DEBUGMODE_FILE, F_OK) != -1;
110 limiter = log_config_get_int(config, "limiter", DEFAULT_CONFIG_LIMITER);
114 * @brief Configure the library
115 * @details Reads relevant config values
117 static void __configure(void)
119 struct log_config config;
121 if (log_config_read(&config) < 0)
124 __configure_parameters(&config);
126 if (!__configure_backend(&config))
129 __configure_limiter(&config);
131 log_config_free(&config);
135 log_config_free(&config); // LCOV_EXCL_LINE
141 * @details Initializes the library
143 static inline void __dlog_init(void)
145 static int is_initialized = 0;
150 pthread_mutex_lock(&log_init_lock);
152 if (!is_initialized) {
157 pthread_mutex_unlock(&log_init_lock);
161 * @brief Fatal assertion
162 * @details Conditionally crash the sucka who sent the log
163 * @param[in] prio Priority of the log
165 static void __dlog_fatal_assert(int prio)
167 assert(!fatal_assert || (prio != DLOG_FATAL));
171 * @brief Check log validity
172 * @details Checks whether the log is valid and eligible for printing
173 * @param[in] log_id The target buffer ID
174 * @param[in] prio The log's priority
175 * @param[in] tag The log's tag
176 * @return 0 on success, else an error code.
177 * @retval DLOG_ERROR_INVALID_PARAMETER Invalid parameter
178 * @retval DLOG_ERROR_NOT_PERMITTED Not permitted
180 static int dlog_should_log(log_id_t log_id, int prio, const char *tag)
182 if (!debugmode && prio <= DLOG_DEBUG)
183 return DLOG_ERROR_INVALID_PARAMETER;
186 return DLOG_ERROR_INVALID_PARAMETER;
188 if (log_id == LOG_ID_INVALID || LOG_ID_MAX <= log_id)
189 return DLOG_ERROR_INVALID_PARAMETER;
191 if (log_id != LOG_ID_APPS && !plog)
192 return DLOG_ERROR_NOT_PERMITTED;
195 __dynamic_filters_update();
197 // LCOV_EXCL_START : disabled feature (limiter)
198 pthread_mutex_lock(&log_init_lock);
199 int should_log = __log_limiter_pass_log(tag, prio);
200 pthread_mutex_unlock(&log_init_lock);
203 return DLOG_ERROR_NOT_PERMITTED;
204 } else if (should_log < 0) {
205 write_to_log(log_id, prio, tag,
206 "Your log has been blocked due to limit of log lines per minute.");
207 return DLOG_ERROR_NOT_PERMITTED;
212 return DLOG_ERROR_NONE;
215 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)
217 char buf[LOG_MAX_PAYLOAD_SIZE];
221 int ret = check_should_log ? dlog_should_log(log_id, prio, tag) : 0;
225 vsnprintf(buf, sizeof buf, fmt, ap);
227 return write_to_log(log_id, prio, tag, buf);
232 * @details Print a log line
233 * @param[in] log_id The target buffer ID
234 * @param[in] prio Priority
236 * @param[in] fmt Format (same as printf)
237 * @param[in] ap Argument list
238 * @return Bytes written, or negative error
240 int __dlog_vprint(log_id_t log_id, int prio, const char *tag, const char *fmt, va_list ap)
242 int ret = __write_to_log(log_id, prio, tag, fmt, ap, true);
243 __dlog_fatal_assert(prio);
250 * @details Print a log line
251 * @param[in] log_id The target buffer ID
252 * @param[in] prio Priority
254 * @param[in] fmt Format (same as printf)
255 * @return Bytes written, or negative error
257 int __dlog_print(log_id_t log_id, int prio, const char *tag, const char *fmt, ...)
262 int ret = __dlog_vprint(log_id, prio, tag, fmt, ap);
268 int dlog_vprint(log_priority prio, const char *tag, const char *fmt, va_list ap)
270 return __write_to_log(LOG_ID_APPS, prio, tag, fmt, ap, false);
273 int dlog_print(log_priority prio, const char *tag, const char *fmt, ...)
278 int ret = dlog_vprint(prio, tag, fmt, ap);
285 * @brief Finalize DLog
286 * @details Finalizes and deallocates the library
287 * @notes Assumes it has exclusive thread access,
288 * i.e. no other library function can run in parallel
290 void __attribute__((destructor)) __dlog_fini(void)
292 __log_limiter_destroy();
293 __dynamic_filters_destroy();