Google-glog open-source database analysis (2): glog usage

Glog usage

• Set symbol variables to customize log Behavior
  • For more information about how to set symbol variables, see symbol variables in glog introduction.
• Log system initialization
  • Initialization function: Google: initgooglelogging (argv [0])
  • The initialization parameter is generally the first command line parameter-that is, the program name.
• You can call the function to disable the log system at the end.
  • Function for disabling logstore: Google: shutdowngooglelogging ()
• When the program is running, you can use command line parameters or environment variables to control the log behavior of the program.

Glog APIs:

• Void Google: initgooglelogging (const char * argv0)
  • Initialize the glog library. The parameter is the first command line parameter, that is, the program name.
• Void Google: shutdowngooglelogging ()
  • Disable glog Library
• Void Google: flushlogfiles (loseverity min_severity)
  • [Thread-safe] All log messages of a specified level or above are immediately written to the log file.
• Void Google: flushlogfilesunsafe (logseverity min_severity)
  • Non-thread-Safe Output of log messages of a specified level or above, used to output necessary log messages in case of catastrophic program Problems
• Void Google: setlogdestination (logseverity severity, const char * baseFilename)
  • [Thread-safe] sets the log file output at the specified level. If basefilename is "", logs of this level are not output.
• Void Google: setlogsymlink (logseverity severity, const char * symlinkBasename)
  • [Thread-safe] sets the soft connection of top-level log files. If symlikbasename is null, it indicates no soft connection is set.
  • If you do not call this function, the default connection name is the program name.
• Void Google: addlogsink (logsink * destination)
• Void Google: removelogsink (logsink * destination)
  • [Thread-safe] adding and deleting log output channels
• Void Google: setlogfilenameextension (const char * filename_extension)
  • [Thread-safe] adds a file extension for all log files, especially for log files set by setlogdestination ()
  • The common practice is to use the listening port number as the log file extension.
• Void Google: setstderrlogging (logseverity min_severity)
  • [Thread-safe] determines the minimum log level that is output to stderr in addition to the log file
• Void Google: logtostderr ()
  • [Thread-safe] setting only outputs logs to stderr but not to log files
• Void Google: setemaillogging (logseverity min_severity, const char * address)
  • [Thread-safe] sets the minimum log level for sending mail
• Bool Google: sendemail (const char * DEST, const char * subject, const char * Body)
  • [Thread-safe] Send email
• Const STD: Vector & Google: getloggingdirectories ()
  • Get log output directory set
• Void Google: installfailuresignalhandler ()
  • Signal processing function. The main signal processed is SIGSEGV/sigill/sigfpe/sigbrt/sigbus/sigterm.
• Void Google: installfailurewriter (void (* writer) (const char * data, int size ))
  • Set the output function when the system crashes. The data does not necessarily end with '\ 0'.
• void Google: installfailurefunction (void (* fail_func )())
  • set the function called by log (fatal) after the log message is output