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.. _module-pw_log_basic:
``pw_log_basic`` is a ``pw_log backend`` that sends logs over ``pw_sys_io`` by
default. The destination of ``pw_sys_io`` depends on the ``pw_sys_io`` backend
in use. This is controlled by the ``dir_pw_sys_io_backend`` variable in a
target's ``target_config.gni``.
The log output may be changed from ``pw_sys_io`` to an arbitrary function by
calling ``pw::log_basic::SetOutput``.
.. cpp:namespace:: pw::log_basic
.. cpp:function:: void SetOutput(void (*log_output)(std::string_view))
Set the log output function, which defaults ``pw_sys_io::WriteLine``. This
function is called with each formatted log message.
This module employs an internal buffer for formatting log strings, and currently
has a fixed size of 150 bytes. Any final log statements that are larger than
149 bytes (one byte used for a null terminator) will be truncated.
.. note::
The documentation for this module is currently incomplete.