logDefaultHandler

The default log handler set up by GLib; funcGLib.log_set_default_handler allows to install an alternate default log handler.

This is used if no log handler has been set for the particular log domain and log level combination. It outputs the message to stderr or stdout and if the log level is fatal it calls funcGLib.BREAKPOINT. It automatically prints a new-line character after the message, so one does not need to be manually included in message.

The behavior of this log handler can be influenced by a number of environment variables:

• G_MESSAGES_PREFIXED: A `:`-separated list of log levels for which

messages should be prefixed by the program name and PID of the application.

• G_MESSAGES_DEBUG: A space-separated list of log domains for

which debug and informational messages are printed. By default these messages are not printed. If you need to set the allowed domains at runtime, use funcGLib.log_writer_default_set_debug_domains.

stderr is used for levels flagsGLib.LogLevelFlags.LEVEL_ERROR, flagsGLib.LogLevelFlags.LEVEL_CRITICAL, flagsGLib.LogLevelFlags.LEVEL_WARNING and flagsGLib.LogLevelFlags.LEVEL_MESSAGE. stdout is used for the rest, unless stderr was requested by funcGLib.log_writer_default_set_use_stderr.

This has no effect if structured logging is enabled; see

Using Structured Logging.

Parameters

logDomain	the log domain of the message, or NULL for the default `""` application domain
logLevel	the level of the message
message	the message
unusedData	data passed from funcGLib.log which is unused