log.h
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/*
* Copyright (C) 2015 Kaspar Schleiser <kaspar@schleiser.de>
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @addtogroup core_util
* @{
*
* @file
* @brief System logging header
*
* This header offers a bunch of "LOG_*" functions that, with the default
* implementation, just use printf, but honour a verbosity level.
*
* If desired, it is possible to implement a log module which then will be used
* instead the default printf-based implementation. In order to do so, the log
* module has to
*
* 1. provide "log_module.h"
* 2. have a name starting with "log_" *or* depend on the pseudo-module LOG,
* 3. implement log_write()
*
* See "sys/log/log_printfnoformat" for an example.
*
* @author Kaspar Schleiser <kaspar@schleiser.de>
*/
#ifndef LOG_H
#define LOG_H
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief defined log levels
*
* These are the logging levels a user can choose.
* The idea is to set LOG_LEVEL to one of these values in the application's Makefile.
* That will restrict output of log statements to those with equal or lower log level.
*
* The default log level is LOG_INFO, which will print every message.
*
* The log function calls of filtered messages will be optimized out at compile
* time, so a lower log level might result in smaller code size.
*/
enum {
LOG_NONE, /**< Lowest log level, will output nothing */
LOG_ERROR, /**< Error log level, will print only critical,
non-recoverable errors like hardware initialization
failures */
LOG_WARNING, /**< Warning log level, will print warning messages for
temporary errors */
LOG_INFO, /**< Informational log level, will print purely
informational messages like successful system bootup,
network link state, ...*/
LOG_DEBUG, /**< Debug log level, printing developer stuff considered
too verbose for production use */
LOG_ALL /**< print everything */
};
#ifndef LOG_LEVEL
/**
* @brief Default log level define
*/
#define LOG_LEVEL LOG_INFO
#endif
/**
* @brief Log message if level <= LOG_LEVEL
*/
#ifdef __clang__ /* following pragmas required for clang 3.8.0 */
#define LOG(level, ...) do { \
_Pragma("clang diagnostic push") \
_Pragma("clang diagnostic ignored \"-Wtautological-compare\"") \
if ((level) <= LOG_LEVEL) log_write((level), __VA_ARGS__); } while (0U) \
_Pragma("clang diagnostic pop")
#else
#define LOG(level, ...) do { \
if ((level) <= LOG_LEVEL) log_write((level), __VA_ARGS__); } while (0U)
#endif /* __clang__ */
/**
* @name Logging convenience defines
* @{
*/
#define LOG_ERROR(...) LOG(LOG_ERROR, __VA_ARGS__)
#define LOG_WARNING(...) LOG(LOG_WARNING, __VA_ARGS__)
#define LOG_INFO(...) LOG(LOG_INFO, __VA_ARGS__)
#define LOG_DEBUG(...) LOG(LOG_DEBUG, __VA_ARGS__)
/** @} */
#ifdef MODULE_LOG
#include "log_module.h"
#else
#include <stdio.h>
/**
* @brief Default log_write function, just maps to printf
*/
#define log_write(level, ...) printf(__VA_ARGS__)
#endif
#ifdef __cplusplus
}
#endif
#endif /* LOG_H */
/** @} */