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bertos/cfg/log.h
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bertos/cfg/log.h
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/**
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* \file
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* <!--
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* This file is part of BeRTOS.
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*
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* Bertos is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* As a special exception, you may use this file as part of a free software
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* library without restriction. Specifically, if other files instantiate
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* templates or use macros or inline functions from this file, or you compile
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* this file and link it with other files to produce an executable, this
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* file does not by itself cause the resulting executable to be covered by
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* the GNU General Public License. This exception does not however
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* invalidate any other reasons why the executable file might be covered by
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* the GNU General Public License.
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*
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* Copyright 2008 Develer S.r.l. (http://www.develer.com/)
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*
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* -->
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*
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* \defgroup logging Logging facilities
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* \ingroup core
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* \{
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* \brief Logging system module.
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*
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* This module implement a simple interface to use the multi level logging system.
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* The log message have the priority order, like this:
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*
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* - error message (highest)
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* - warning message
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* - info message (lowest)
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*
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* With this priority system we log only the messages that have priority higher
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* or equal to the log level that has been configurated; messages below the
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* selected log level are not included at compile time, so no time and space
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* is wasted on unused functions.
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*
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* Furthermore you can define different log levels for each module. To do this
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* you just need to define LOG_LEVEL in the configuration file for the
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* selected module.
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*
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* This module provides two types of macros:
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*
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* - LOG_* macros: these macros allow formatted output, using the same format
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* as kprintf
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* - LOG_*B macros: these macros allow to optionally compile a block of code
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* depending on the logging level chosen
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*
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* To use the logging system you should include this module in your driver
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* and use one of the LOG_ERR, LOG_WARN and LOG_INFO macros to output error
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* messages.
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* Then you should define a LOG_LEVEL and LOG_VERBOSE costant in your
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* \c cfg/cfg_\<your_cfg_module_name\>.h using the follow policy:
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*
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* - in your file \c cfg/cfg_\<cfg_module_name\>.h, define the logging
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* level and verbosity mode for your specific module:
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*
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* \code
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* /// Module logging level.
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* #define <cfg_module_name>_LOG_LEVEL LOG_LVL_INFO
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*
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* /// Module logging format.
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* #define <cfg_module_name>_LOG_FORMAT LOG_FMT_VERBOSE
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* \endcode
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*
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* - then, in the module where you use the logging macros you should define
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* the macros LOG_LEVEL and LOG_FORMAT and you should include cfg/log.h
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* module, as demonstrated in the following example:
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*
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* \code
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* // Define log settings for cfg/log.h.
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* #define LOG_LEVEL <cfg_module_name>_LOG_LEVEL
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* #define LOG_FORMAT <cfg_module_name>_LOG_FORMAT
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* #include <cfg/log.h>
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* \endcode
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*
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* if you include a log.h module without defining the LOG_LEVEL and LOG_VERBOSE
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* macros, the module uses the default settings.
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*
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* WARNING: when using the log.h module make sure to include this module after
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* a \c cfg_<cfg_module_name>.h, because the LOG_LEVEL and LOG_VERBOSE macros
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* must be defined before including the log module. Otherwise the log module
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* will use the default settings.
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*
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* \author Daniele Basile <asterix@develer.com>
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*
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* $WIZ$
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*/
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#ifndef CFG_LOG_H
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#define CFG_LOG_H
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#include <cfg/debug.h>
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// Use a default setting if nobody defined a log level
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#ifndef LOG_LEVEL
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#define LOG_LEVEL LOG_LVL_ERR
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#endif
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// Use a default setting if nobody defined a log format
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#ifndef LOG_FORMAT
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#define LOG_FORMAT LOG_FMT_TERSE
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#endif
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/**
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* \name Logging level definition
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*
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* When you choose a log level messages you choose
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* also which print function are linked.
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* When using a log level, you link all log functions that have a priority
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* higher or equal than the level you chose.
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* The priority level go from error (highest) to info (lowest).
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*
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* $WIZ$ log_level = "LOG_LVL_NONE", "LOG_LVL_ERR", "LOG_LVL_WARN", "LOG_LVL_INFO"
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* \{
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*/
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#define LOG_LVL_NONE 0
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#define LOG_LVL_ERR 1
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#define LOG_LVL_WARN 2
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#define LOG_LVL_INFO 3
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/** \} */
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/**
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* \name Logging format
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*
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* There are two logging format: terse and verbose. The latter prepends
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* function names and line number information to each log entry.
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*
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* $WIZ$ log_format = "LOG_FMT_VERBOSE", "LOG_FMT_TERSE"
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* \{
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*/
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#define LOG_FMT_VERBOSE 1
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#define LOG_FMT_TERSE 0
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/** \} */
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#if LOG_FORMAT == LOG_FMT_VERBOSE
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#define LOG_PRINT(str_level, str,...) kprintf("%s():%d:%s: " str, __func__, __LINE__, str_level, ## __VA_ARGS__)
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#elif LOG_FORMAT == LOG_FMT_TERSE
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#define LOG_PRINT(str_level, str,...) kprintf("%s: " str, str_level, ## __VA_ARGS__)
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#else
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#error No LOG_FORMAT defined
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#endif
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#if LOG_LEVEL >= LOG_LVL_ERR
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/**
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* Output an error message
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*/
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#define LOG_ERR(str,...) LOG_PRINT("ERR", str, ## __VA_ARGS__)
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/**
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* Define a code block that will be compiled only when LOG_LEVEL >= LOG_LVL_ERR
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*/
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#define LOG_ERRB(x) x
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#else
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INLINE void LOG_ERR(UNUSED_ARG(const char *, fmt), ...) { /* nop */ }
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#define LOG_ERRB(x) /* Nothing */
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#endif
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#if LOG_LEVEL >= LOG_LVL_WARN
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/**
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* Output a warning message
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*/
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#define LOG_WARN(str,...) LOG_PRINT("WARN", str, ## __VA_ARGS__)
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/**
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* Define a code block that will be compiled only when LOG_LEVEL >= LOG_LVL_WARN
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*/
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#define LOG_WARNB(x) x
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#else
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INLINE void LOG_WARN(UNUSED_ARG(const char *, fmt), ...) { /* nop */ }
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#define LOG_WARNB(x) /* Nothing */
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#endif
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#if LOG_LEVEL >= LOG_LVL_INFO
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/**
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* Output an informative message
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*/
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#define LOG_INFO(str,...) LOG_PRINT("INFO", str, ## __VA_ARGS__)
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/**
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* Define a code block that will be compiled only when LOG_LEVEL >= LOG_LVL_INFO
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*/
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#define LOG_INFOB(x) x
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#else
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INLINE void LOG_INFO(UNUSED_ARG(const char *, fmt), ...) { /* nop */ }
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#define LOG_INFOB(x) /* Nothing */
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#endif
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/** \} */
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#endif /* CFG_LOG_H */
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