The default log handler set up by GLib; g_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 G_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
aplication.
- 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.
stderr is used for levels G_LOG_LEVEL_ERROR, G_LOG_LEVEL_CRITICAL,
G_LOG_LEVEL_WARNING and G_LOG_LEVEL_MESSAGE. stdout is used for
the rest.
This has no effect if structured logging is enabled; see
[Using Structured Logging][using-structured-logging].
The default log handler set up by GLib; g_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 G_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 aplication.
- 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.
stderr is used for levels G_LOG_LEVEL_ERROR, G_LOG_LEVEL_CRITICAL, G_LOG_LEVEL_WARNING and G_LOG_LEVEL_MESSAGE. stdout is used for the rest.
This has no effect if structured logging is enabled; see [Using Structured Logging][using-structured-logging].