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ost::Slog(3) Library Functions Manual ost::Slog(3)

NAME

ost::Slog - The slog class is used to stream messages to the system's logging facility (syslogd).

SYNOPSIS

#include <slog.h>

Inherits streambuf, and ostream.

Public Types


enum Class { classSecurity, classAudit, classDaemon, classUser, classDefault, classLocal0, classLocal1, classLocal2, classLocal3, classLocal4, classLocal5, classLocal6, classLocal7 }
enum Level { levelEmergency = 1, levelAlert, levelCritical, levelError, levelWarning, levelNotice, levelInfo, levelDebug }
typedef enum ost::Slog::Class Class
typedef enum ost::Slog::Level Level

Public Member Functions


Slog (void)
Default (and only) constructor. virtual ~Slog (void)
void close (void)
void open (const char *ident, Class grp=classUser)
(re)opens the output stream. Slog & operator() (const char *ident, Class grp=classUser, Level level=levelError)
Sets the log identifier, level, and class to use for subsequent output. Slog & operator() (Level level, Class grp=classDefault)
Changes the log level and class to use for subsequent output. Slog & operator() (void)
Does nothing except return *this. void error (const char *format,...)
Print a formatted syslog string. void warn (const char *format,...)
Print a formatted syslog string. void debug (const char *format,...)
Print a formatted syslog string. void emerg (const char *format,...)
Print a formatted syslog string. void alert (const char *format,...)
Print a formatted syslog string. void critical (const char *format,...)
Print a formatted syslog string. void notice (const char *format,...)
Print a formatted syslog string. void info (const char *format,...)
Print a formatted syslog string. void level (Level enable)
Sets the logging level. void clogEnable (bool f=true)
Enables or disables the echoing of the messages to clog in addition to the syslog daemon. Slog & warn (void)
Slog & error (void)
Slog & debug (void)
Slog & emerg (void)
Slog & alert (void)
Slog & critical (void)
Slog & notice (void)
Slog & info (void)

Protected Member Functions


int overflow (int c)
This is the streambuf function that actually outputs the data to the device.

Detailed Description

The slog class is used to stream messages to the system's logging facility (syslogd).

A default slog object is used to avoid confusion with the native syslog facility and to imply a logical relationship to the C++ clog().

The key difference is that the slog object sends it's output to the system logging daemon (typically syslogd) rather than through stderr. slog can be streamed with the << operator just like clog; a default slog object is pre-initialized, and you stream character data to it.

The slog allows one to specify logging levels and other properties through the () operators. Hence, once can do:

slog('mydaemon', SLOG_DAEMON, SLOG_EMERGENCY) << I just died << endl;

or things like:

slog('mydaemon', SLOG_DAEMON);
slog(SLOG_INFO) << 'daemon initalized' << endl;

The intent is to be as common-place and as convenient to use as the stderr based clog facility found in C++, and this is especially useful for C++ daemons.

The std::flush manipulator doesn't work. Either the std::endl or std::ends manipulators must be used to cause the output to be sent to the daemon.

When this class is used on a system that doesn't have the syslog headers (i.e. a non-posix win32 box), the output goes to the a file with the same name as the syslog identifier string with '.log' appended to it. If the identifier string ends in '.exe', the '.exe' is removed before the '.log' is appened. (e.g. the identifier foo.exe will generate a log file named foo.log)

Author

David Sugar dyfet@ostel.com
Minor docs & hacks by Jon Little littlej@arlut.utexas.edu

system logging facility class.

Member Typedef Documentation

typedef enum ost::Slog::Class ost::Slog::Class

typedef enum ost::Slog::Level ost::Slog::Level

Member Enumeration Documentation

enum ost::Slog::Class

Enumerator

enum ost::Slog::Level

Enumerator

Constructor & Destructor Documentation

ost::Slog::Slog (void)

Default (and only) constructor. The default log level is set to SLOG_DEBUG. There is no default log facility set. One should be set before attempting any output. This is done by the open() or the operator()(const char*, Class, Level) functions.

virtual ost::Slog::~Slog (void) [virtual]

Member Function Documentation

void ost::Slog::alert (const char * format, ...)

Print a formatted syslog string.

Parameters

format string.

Slog& ost::Slog::alert (void) [inline]

References levelAlert.

void ost::Slog::clogEnable (bool f = true) [inline]

Enables or disables the echoing of the messages to clog in addition to the syslog daemon. This is enabled by the default class constructor.

Parameters

f true to enable, false to disable clog output

Examples
slogTest.cpp.

void ost::Slog::close (void)

void ost::Slog::critical (const char * format, ...)

Print a formatted syslog string.

Parameters

format string.

Slog& ost::Slog::critical (void) [inline]

References levelCritical.

void ost::Slog::debug (const char * format, ...)

Print a formatted syslog string.

Parameters

format string.

Slog& ost::Slog::debug (void) [inline]

References levelDebug.

void ost::Slog::emerg (const char * format, ...)

Print a formatted syslog string.

Parameters

format string.

Slog& ost::Slog::emerg (void) [inline]

References levelEmergency.

void ost::Slog::error (const char * format, ...)

Print a formatted syslog string.

Parameters

format string.

Slog& ost::Slog::error (void) [inline]

References levelError.

void ost::Slog::info (const char * format, ...)

Print a formatted syslog string.

Parameters

format string.

Slog& ost::Slog::info (void) [inline]

References levelInfo.

void ost::Slog::level (Level enable) [inline]

Sets the logging level.

Parameters

enable is the logging level to use for further output

void ost::Slog::notice (const char * format, ...)

Print a formatted syslog string.

Parameters

format string.

Slog& ost::Slog::notice (void) [inline]

References levelNotice.

void ost::Slog::open (const char * ident, Class grp = classUser)

(re)opens the output stream.

Parameters

ident The identifier portion of the message sent to the syslog daemon.
grp The log facility the message is sent to

Slog& ost::Slog::operator() (const char * ident, Class grp = classUser, Level level = levelError)

Sets the log identifier, level, and class to use for subsequent output.

Parameters

ident The identifier portion of the message
grp The log facility the message is sent to
level The log level of the message

Slog& ost::Slog::operator() (Level level, Class grp = classDefault)

Changes the log level and class to use for subsequent output.

Parameters

level The log level of the message
grp The log facility the message is sent to

Slog& ost::Slog::operator() (void)

Does nothing except return *this.

int ost::Slog::overflow (int c) [protected]

This is the streambuf function that actually outputs the data to the device. Since all output should be done with the standard ostream operators, this function should never be called directly.

void ost::Slog::warn (const char * format, ...)

Print a formatted syslog string.

Parameters

format string.

Slog& ost::Slog::warn (void) [inline]

References levelWarning.

Author

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Sun Dec 27 2020 GNU CommonC++