The slog class is used to stream messages to the system's logging facility (syslogd). More...
#include <slog.h>
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)
system logging facility class.
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.
true )
(re)opens the output stream.
Sets the log identifier, level, and class to use for subsequent output.
Changes the log level and class to use for subsequent output.
Does nothing except return *this.
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.