[ CCode ( delegate_target = false ) ]
public LogWriterFunc writer_default
Format a structured log message and output it to the default log destination for the platform.
On Linux, this is typically the systemd journal, falling back to `stdout` or `stderr` if running from the terminal or if output is being redirected to a file.
Support for other platform-specific logging mechanisms may be added in future. Distributors of GLib may modify this function to impose their own (documented) platform-specific log writing policies.
As with default_handler, this function drops debug and informational messages unless their log domain (or `all`) is listed in the space-separated `G_MESSAGES_DEBUG` environment variable.
key–value pairs of structured data forming the log message
log level, either from LogLevelFlags, or a user-defined level
number of elements in the
user data passed to set_writer_func
g_log_writer_handled on success, g_log_writer_unhandled otherwise