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 "loglimiter.h"
26 #include "logconfig.h"
30 #define DEFAULT_CONFIG_LIMITER 0
31 #define DEFAULT_CONFIG_PLOG 1
32 #define DEFAULT_CONFIG_DEBUGMODE 0
34 static int __write_to_log_null(log_id_t, log_priority, const char *, const char *);
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) = __write_to_log_null;
47 pthread_mutex_t log_init_lock = PTHREAD_MUTEX_INITIALIZER;
48 extern void __dlog_init_pipe();
49 extern void __dlog_init_android();
54 static int fatal_assert;
58 * @details Ignores a log
59 * @param[in] log_id ID of the buffer to log to. Belongs to (LOG_ID_INVALID, LOG_ID_MAX) non-inclusive
60 * @param[in] prio Priority of the message.
61 * @param[in] tag The message tag, identifies the sender.
62 * @param[in] msg The contents of the message.
63 * @return DLOG_ERROR_NOT_PERMITTED
65 static int __write_to_log_null(log_id_t log_id, log_priority prio, const char *tag, const char *msg)// LCOV_EXCL_LINE
67 return DLOG_ERROR_NOT_PERMITTED; // LCOV_EXCL_LINE
70 static int __configure_backend(struct log_config *config)
74 const char *const backend = log_config_get(config, "backend");
78 if (!strcmp(backend, "pipe"))
80 else if (!strcmp(backend, "logger"))
81 __dlog_init_android();
88 static void __configure_parameters(struct log_config *config)
92 plog = log_config_get_int(config, "plog", DEFAULT_CONFIG_PLOG);
93 debugmode = log_config_get_int(config, "debugmode", DEFAULT_CONFIG_DEBUGMODE);
94 fatal_assert = access(DEBUGMODE_FILE, F_OK) != -1;
95 limiter = __configure_limiter(config, DEFAULT_CONFIG_LIMITER);
99 * @brief Configure the library
100 * @details Reads relevant config values
102 static void __configure(void)
104 struct log_config config;
106 if (log_config_read(&config) < 0)
109 __configure_parameters(&config);
111 if (!__configure_backend(&config))
114 log_config_free(&config);
118 log_config_free(&config); // LCOV_EXCL_LINE
124 * @details Initializes the library
126 static inline void __dlog_init(void)
128 static int is_initialized = 0;
133 pthread_mutex_lock(&log_init_lock);
135 if (!is_initialized) {
140 pthread_mutex_unlock(&log_init_lock);
144 * @brief Fatal assertion
145 * @details Conditionally crash the sucka who sent the log
146 * @param[in] prio Priority of the log
148 static void __dlog_fatal_assert(int prio)
150 assert(!fatal_assert || (prio != DLOG_FATAL));
154 * @brief Check log validity
155 * @details Checks whether the log is valid and eligible for printing
156 * @param[in] log_id The target buffer ID
157 * @param[in] prio The log's priority
158 * @param[in] tag The log's tag
159 * @return 0 on success, else an error code.
160 * @retval DLOG_ERROR_INVALID_PARAMETER Invalid parameter
161 * @retval DLOG_ERROR_NOT_PERMITTED Not permitted
163 static int dlog_should_log(log_id_t log_id, int prio, const char *tag)
165 if (!debugmode && prio <= DLOG_DEBUG)
166 return DLOG_ERROR_INVALID_PARAMETER;
169 return DLOG_ERROR_INVALID_PARAMETER;
171 if (log_id == LOG_ID_INVALID || LOG_ID_MAX <= log_id)
172 return DLOG_ERROR_INVALID_PARAMETER;
174 if (log_id != LOG_ID_APPS && !plog)
175 return DLOG_ERROR_NOT_PERMITTED;
178 // LCOV_EXCL_START : disabled feature (limiter)
179 int should_log = __log_limiter_pass_log(tag, prio);
182 return DLOG_ERROR_NOT_PERMITTED;
183 } else if (should_log < 0) {
184 write_to_log(log_id, prio, tag,
185 "Your log has been blocked due to limit of log lines per minute.");
186 return DLOG_ERROR_NOT_PERMITTED;
191 return DLOG_ERROR_NONE;
194 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)
196 char buf[LOG_MAX_PAYLOAD_SIZE];
200 int ret = check_should_log ? dlog_should_log(log_id, prio, tag) : 0;
204 vsnprintf(buf, sizeof buf, fmt, ap);
206 return write_to_log(log_id, prio, tag, buf);
211 * @details Print a log line
212 * @param[in] log_id The target buffer ID
213 * @param[in] prio Priority
215 * @param[in] fmt Format (same as printf)
216 * @param[in] ap Argument list
217 * @return Bytes written, or negative error
219 int __dlog_vprint(log_id_t log_id, int prio, const char *tag, const char *fmt, va_list ap)
221 int ret = __write_to_log(log_id, prio, tag, fmt, ap, true);
222 __dlog_fatal_assert(prio);
229 * @details Print a log line
230 * @param[in] log_id The target buffer ID
231 * @param[in] prio Priority
233 * @param[in] fmt Format (same as printf)
234 * @return Bytes written, or negative error
236 int __dlog_print(log_id_t log_id, int prio, const char *tag, const char *fmt, ...)
241 int ret = __dlog_vprint(log_id, prio, tag, fmt, ap);
247 int dlog_vprint(log_priority prio, const char *tag, const char *fmt, va_list ap)
249 return __write_to_log(LOG_ID_APPS, prio, tag, fmt, ap, false);
252 int dlog_print(log_priority prio, const char *tag, const char *fmt, ...)
257 int ret = dlog_vprint(prio, tag, fmt, ap);
264 * @brief Finalize DLog
265 * @details Finalizes and deallocates the library
267 void __attribute__((destructor)) __dlog_fini(void)
269 __log_limiter_destroy();