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.
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:
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.