[ Version ( since = "2.50" ) ]
[ 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.

This is suitable for use as a LogWriterFunc, and is the default writer used if no other is set using set_writer_func.

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 fields array


user data passed to set_writer_func


g_log_writer_handled on success, g_log_writer_unhandled otherwise

Namespace: GLib.Log
Package: glib-2.0