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+[[!meta title="Documentation/Front end functions"]]
+[[!meta author="James Bursa"]]
+[[!meta date="2011-11-26T22:20:01Z"]]
+
+
+[[!toc]] This page documents the
+functions that need to be implemented by each platform's front end.
+
+:   *Note: in progress and incomplete*
+
+The prototypes for these functions are usually in gui/gui.h. The
+implementations live in the platform code, for example **gui\_init()**
+is implemented in each of amiga/gui.c, beos/beos\_gui.cpp,
+framebuffer/gui.c, gtk/gtk\_gui.c, riscos/gui.c, and windows/gui.c. Of
+course only one of those implementations is ever compiled into a binary
+of NetSurf.
+
+Initialization and clean-up
+---------------------------
+
+### int main(int argc, char\*\* argv)
+
+This is the standard C entry point. It should do any critical very-early
+initialization is required, and finish with
+
+`return netsurf_main(argc, argv);`
+
+The prototype may differ on some platforms.
+
+### void gui\_init(int argc, char\*\* argv)
+
+General initialization of platform stuff. Prepare the gui for use, but
+don't yet open any windows.
+
+It should call:
+
+-   hubbub\_initialise(), with the platform-specific path to the Aliases
+    file
+-   options\_read(), if saving and loading options is supported
+-   messages\_load(), with the platform-specific path to the Messages
+    file
+-   save\_complete\_init(), if save complete is used
+-   urldb\_load() and urldb\_load\_cookies()
+
+Should set default\_stylesheet\_url, quirks\_stylesheet\_url, and
+adblock\_stylesheet\_url.
+
+(Called by netsurf\_init() in desktop/netsurf.c.)
+
+### void gui\_init2(int argc, char\*\* argv)
+
+Last-step of initialization. Can open window(s) by calling
+browser\_window\_create() (e.g. depending on argv).
+
+(Called by netsurf\_init() in desktop/netsurf.c.)
+
+### void gui\_quit(void)
+
+Prepare for exit by doing whatever is needed by the platform.
+
+It should call:
+
+-   urldb\_save\_cookies() and urldb\_save()
+-   hubbub\_finalise()
+
+(Called by netsurf\_exit() in desktop/netsurf.c.)
+
+Multitasking
+------------
+
+### void gui\_multitask(void)
+
+NetSurf's core will occasionally call this during long-running
+operations. It should yield briefly to the OS if applicable, and handle
+urgent gui events to keep NetSurf responsive. Then it should return
+quickly.
+
+It **must not** call any function in the core or non-platform code.
+
+[[!inline raw=yes pages="Documentation"]]
+