Logger Class Reference

Overview

A class for dispatching log messages.

See the long description for the log (Logging) module for more detailed usage information.

Public Member Functions
bool	Startup (LogMessageHandler &message_handler)
	Start logging. More...
void	Shutdown ()
	Stop logging. More...
bool	CanLog (int pri) const noexcept
	Determine whether a priority level can be logged using the mask given via SetLogMask(). More...
void	Log (int pri, const char *format,...)
	Log a message. More...
Logging Shortcuts
void	Debug (const char *format,...)
	Log a message at debug priority.
void	Info (const char *format,...)
	Log a message at informational priority.
void	Notice (const char *format,...)
	Log a message at notice priority.
void	Warning (const char *format,...)
	Log a message at warning priority.
void	Error (const char *format,...)
	Log a message at error priority.
void	Critical (const char *format,...)
	Log a message at critical priority.
void	Alert (const char *format,...)
	Log a message at alert priority.
void	Emergency (const char *format,...)
	Log a message at emergency priority.
Getters
LogDispatchPolicy	dispatch_policy () const noexcept
	Get the current log dispatch policy.
int	log_mask () const noexcept
	Get the current log mask.
int	log_action () const noexcept
	Get the current log action.
int	syslog_facility () const noexcept
	Get the current Syslog facility value.
const char *	syslog_hostname () const noexcept
	Get the current Syslog HOSTNAME.
const char *	syslog_app_name () const noexcept
	Get the current Syslog APP-NAME.
const char *	syslog_procid () const noexcept
	Get the current Syslog PROCID.
const EtcPalLogParams &	log_params () const noexcept
	Get the log params used by this logger. More...
Setters
Logger &	SetDispatchPolicy (LogDispatchPolicy new_policy) noexcept
	Change the dispatch policy of this logger. More...
Logger &	SetLogMask (int log_mask) noexcept
	Set a new log mask. More...
Logger &	SetLogAction (int log_action) noexcept
	Set the types of log messages to create and dispatch to the LogMessageHandler.
Logger &	SetSyslogFacility (int facility) noexcept
	Set the Syslog facility value; see RFC 5424 § 6.2.1.
Logger &	SetSyslogHostname (const char *hostname) noexcept
	Set the Syslog HOSTNAME; see RFC 5424 § 6.2.4.
Logger &	SetSyslogHostname (const std::string &hostname) noexcept
	Set the Syslog HOSTNAME; see RFC 5424 § 6.2.4.
Logger &	SetSyslogAppName (const char *app_name) noexcept
	Set the Syslog APP-NAME; see RFC 5424 § 6.2.5.
Logger &	SetSyslogAppName (const std::string &app_name) noexcept
	Set the Syslog APP-NAME; see RFC 5424 § 6.2.5.
Logger &	SetSyslogProcId (const char *proc_id) noexcept
	Set the Syslog PROCID; see RFC 5424 § 6.2.6.
Logger &	SetSyslogProcId (const std::string &proc_id) noexcept
	Set the Syslog PROCID; see RFC 5424 § 6.2.6.
Logger &	SetSyslogProcId (int proc_id) noexcept
	Set the Syslog PROCID; see RFC 5424 § 6.2.6.

Member Function Documentation

CanLog()

bool CanLog ( int  pri ) const

inlinenoexcept

Determine whether a priority level can be logged using the mask given via SetLogMask().

See etcpal_can_log() for more information.

Log()

void Log ( int  pri, const char *  format,   ...  )

inline

Log a message.

Only dispatches the log message if pri is part of the mask previously passed to SetLogMask().

Parameters

pri	The priority of this log message.
format	Log message with printf-style format specifiers. Provide additional arguments as appropriate.

log_params()

const EtcPalLogParams & log_params ( ) const

inlinenoexcept

Get the log params used by this logger.

This is convenient when interacting with C APIs which take an EtcPalLogParams instance to log their own messages. Passing these params to those APIs will gather those log messages into this logger instance.

SetDispatchPolicy()

Logger & SetDispatchPolicy ( LogDispatchPolicy  new_policy )

inlinenoexcept

Change the dispatch policy of this logger.

Only has any effect if the logger has not been started yet.

Parameters

new_policy

The new dispatch policy.

SetLogMask()

Logger & SetLogMask ( int  log_mask )

inlinenoexcept

Set a new log mask.

Use the ETCPAL_LOG_UPTO() macro to create a mask up to and including a priority level. For example, ETCPAL_LOG_UPTO(ETCPAL_LOG_WARNING) will allow all messages with priorites from emergency through warning, inclusive.

Parameters

log_mask

The new log mask.

Shutdown()

void Shutdown ( )

inline

Stop logging.

If the dispatch policy is LogDispatchPolicy::Queued (the default) this will dispatch the rest of the log messages and wait for the dispatch thread to join.

Startup()

bool Startup ( LogMessageHandler &  message_handler )

inline

Start logging.

Spawns a thread to dispatch log messages unless SetDispatchPolicy(LogDispatchPolicy::Direct) has been called. Do not call more than once between calls to Shutdown().

Parameters

message_handler

The class instance that will handle log messages from this logger.

---

The documentation for this class was generated from the following file:

• include/etcpal/cpp/log.h