Description

Plugin loader implementation.

Definition in file plugin.c.

#include "include/logging.h"
#include "lib/safeclib.h"
#include "lib/tmpbuf.h"
#include "lib/psplay.h"
#include "lib/recmutex.h"
#include "lib/error.h"
#include "include/config-facade.h"
#include "common/interfaceregistry.h"
#include "common/config.h"
#include "common/plugin.h"
#include <glob.h>
#include <nobug.h>

Classes
struct	lumiera_plugin

struct	lumiera_plugintype
	record the extension and a callback function for loading the associated plugin for each plugin type More...

Typedefs
typedef lumiera_plugintype *	LumieraPlugintype

Macros
#define	LUMIERA_PLUGIN_TYPE(type, ext)

#define	LUMIERA_PLUGIN_TYPE(type, ext) {lumiera_plugin_load_##type, lumiera_plugin_unload_##type, ext},

#define	LUMIERA_PLUGIN_TYPE_PLANNED(name, ext)

#define	LUMIERA_PLUGIN_TYPES
	Supported (and planned) plugin types and their file extensions This maps filename extensions to implementations (of the respective _load_NAME and _unload_NAME functions) So far we only support platform dynamic libraries, later we may add plugins implemented in Lua and c source modules which get compiled on the fly. More...

Functions
static char *	init_exts_globs (void)

	LUMIERA_ERROR_DEFINE (PLUGIN_INIT, "Initialisation error")

	LUMIERA_ERROR_DEFINE (PLUGIN_OPEN, "Could not open plugin")

	LUMIERA_ERROR_DEFINE (PLUGIN_WTF, "Not a Lumiera plugin")

	LUMIERA_ERROR_DEFINE (PLUGIN_REGISTER, "Could not register plugin")

	LUMIERA_ERROR_DEFINE (PLUGIN_VERSION, "Plugin Version unsupported")

int	lumiera_plugin_cmp_fn (const void keya, const void keyb)

void	lumiera_plugin_delete_fn (PSplaynode node)

int	lumiera_plugin_discover (LumieraPlugin(callback_load)(const char plugin), int(*callback_register)(LumieraPlugin))
	discover new plugins traverses the configured plugin paths and calls the callback_load function for any plugin not actually loaded. More...

lumiera_err	lumiera_plugin_error (LumieraPlugin self)
	Query the error state of a plugin. More...

void *	lumiera_plugin_handle (LumieraPlugin self)
	Query the plugin handle. More...

LumieraPlugin	lumiera_plugin_init (LumieraPlugin self, void *handle, LumieraInterface plugin)

const void *	lumiera_plugin_key_fn (const PSplaynode node)

LumieraPlugin	lumiera_plugin_load (const char *plugin)
	Tries to load a plugin Creates a new plugin structure and tries to load and initialise the plugin. More...

LumieraPlugin	lumiera_plugin_lookup (const char *name)
	Lookup a plugin handle in the pluginregistry. More...

const char *	lumiera_plugin_name (LumieraPlugin self)
	Query the plugin name The name is the path and filename under which it was loaded. More...

LumieraPlugin	lumiera_plugin_new (const char *name)
	Allocates an preinitialises a plugin structure. More...

void	lumiera_plugin_refdec (LumieraPlugin self)

void	lumiera_plugin_refinc (LumieraPlugin self)

int	lumiera_plugin_register (LumieraPlugin plugin)
	Register a plugin and its interfaces. More...

unsigned	lumiera_plugin_unload (LumieraPlugin self)
	Tries to unload a plugin. More...

Variables
static lumiera_plugintype	lumiera_plugin_types []

PSplay	lumiera_pluginregistry

Macro Definition Documentation

◆ LUMIERA_PLUGIN_TYPES

#define LUMIERA_PLUGIN_TYPES

Value:

LUMIERA_PLUGIN_TYPE(DYNLIB, ".so")            \
  LUMIERA_PLUGIN_TYPE(DYNLIB, ".lum")           \
  LUMIERA_PLUGIN_TYPE_PLANNED(LUA, ".lua")      \
  LUMIERA_PLUGIN_TYPE_PLANNED(CSOURCE, ".c")

Supported (and planned) plugin types and their file extensions This maps filename extensions to implementations (of the respective _load_NAME and _unload_NAME functions) So far we only support platform dynamic libraries, later we may add plugins implemented in Lua and c source modules which get compiled on the fly.

Definition at line 68 of file plugin.c.

◆ LUMIERA_PLUGIN_TYPE

#define LUMIERA_PLUGIN_TYPE	(	type,
		ext
	)

Value:

LumieraPlugin lumiera_plugin_load_##type (const char*); \

void lumiera_plugin_unload_##type (LumieraPlugin);

Definition at line 95 of file plugin.c.

Class Documentation

◆ lumiera_plugin_struct

struct lumiera_plugin_struct

Class Members
psplaynode	node
const char *	name
unsigned	refcnt
time_t	last
lumiera_err	error	bulk loading plugins must not fail entirely, just because one plugin doesn't comply. Thus we're recording local errors here
LumieraInterface	plugin
void *	handle

Collaboration diagram for lumiera_plugin:

Function Documentation

◆ lumiera_plugin_new()

LumieraPlugin lumiera_plugin_new ( const char * name )

Allocates an preinitialises a plugin structure.

Parameters

name	path/filename of the plugin

Returns: new allocated/preinitialised plugin structure with its error state set to LUMIERA_ERROR_PLUGIN_INIT

Definition at line 132 of file plugin.c.

References lumiera_malloc(), lumiera_strndup(), and psplaynode_init().

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◆ lumiera_plugin_init()

LumieraPlugin lumiera_plugin_init	(	LumieraPlugin	self,
		void *	handle,
		LumieraInterface	plugin
	)

Complete plugin initialisation Stores any pending error (from loading) in self which clears out the LUMIERA_ERROR_PLUGIN_INIT error state which was initialised by lumiera_plugin_new(), stores the handle and plugin pointers in the plugin struct.

Parameters

self	pointer to the plugin struct
handle	opaque handle referring to some plugin type specific data
plugin	a lumieraorg__plugin interface which will be used to initialise this plugin

Definition at line 148 of file plugin.c.

References lumiera_error().

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◆ lumiera_plugin_error()

lumiera_err lumiera_plugin_error ( LumieraPlugin self )

Query the error state of a plugin.

Parameters

self	plugin to query

Returns: error identifier, NULL if no error was set

Definition at line 158 of file plugin.c.

◆ lumiera_plugin_handle()

void* lumiera_plugin_handle ( LumieraPlugin self )

Query the plugin handle.

Parameters

self	plugin to query

Returns: opaque handle set by the loader functions

Definition at line 166 of file plugin.c.

◆ lumiera_plugin_name()

const char* lumiera_plugin_name ( LumieraPlugin self )

Query the plugin name The name is the path and filename under which it was loaded.

Parameters

self	plugin to query

Returns: pointer to the name string

Definition at line 174 of file plugin.c.

◆ lumiera_plugin_refinc()

void lumiera_plugin_refinc ( LumieraPlugin self )

Increment refcount

Parameters

self	plugin which refcount to increment

Definition at line 181 of file plugin.c.

◆ lumiera_plugin_refdec()

void lumiera_plugin_refdec ( LumieraPlugin self )

Decrement refcount

Parameters

self	plugin which refcount to decrement

Definition at line 188 of file plugin.c.

◆ lumiera_plugin_discover()

int lumiera_plugin_discover	(	LumieraPlugin()(const char plugin)	callback_load,
		int(*)(LumieraPlugin)	callback_register
	)

discover new plugins traverses the configured plugin paths and calls the callback_load function for any plugin not actually loaded.

If callback_load returns a plugin (and not NULL) then this is feed to the callback_register function.

Definition at line 196 of file plugin.c.

References lumiera_config_setdefault().

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◆ lumiera_plugin_load()

LumieraPlugin lumiera_plugin_load ( const char * plugin )

Tries to load a plugin Creates a new plugin structure and tries to load and initialise the plugin.

The plugins error state may be set on any problem which should be queried later.

Parameters

plugin path/filename of the plugin to load

Returns: pointer to the new plugin structure (always, never NULL, check error state)

Definition at line 250 of file plugin.c.

◆ lumiera_plugin_register()

int lumiera_plugin_register ( LumieraPlugin self )

Register a plugin and its interfaces.

Registers the plugin (unconditionally) at the plugin registry. When the error state of the plugin is NULL then use its lumieraorg__plugin interface to register all interfaces offered by the plugin at the interface registry. Registered plugins will be automatic unloaded at application end.

Parameters

self	the plugin to be registered (calling with NULL is a no-op)

Returns: 1 on success (including calling with NULL) and 0 when a error occurred

Definition at line 269 of file plugin.c.

References LUMIERA_RECMUTEX_SECTION.

◆ lumiera_plugin_unload()

unsigned lumiera_plugin_unload ( LumieraPlugin self )

Tries to unload a plugin.

When the Plugin is unused, then all resources associated with it are freed and it will be removed from memory

Parameters

plugin the plugin to be unloaded.

Returns: 0 on success, else the refcount of users which keeping the plugin loaded

Definition at line 306 of file plugin.c.

◆ lumiera_plugin_lookup()

LumieraPlugin lumiera_plugin_lookup ( const char * name )

Lookup a plugin handle in the pluginregistry.

Parameters

name	name of the plugin to be looked up

Returns: plugin handle on success, NULL if the plugin is not found in the registry

Definition at line 347 of file plugin.c.

Variable Documentation

◆ lumiera_plugin_types

lumiera_plugintype lumiera_plugin_types[]

static

Initial value:

=
  {
    LUMIERA_PLUGIN_TYPES
    {NULL, NULL, NULL}
  }

Definition at line 96 of file plugin.c.

Description

Classes

Typedefs

Macros

Functions

Variables

Macro Definition Documentation

◆ LUMIERA_PLUGIN_TYPES

◆ LUMIERA_PLUGIN_TYPE

Class Documentation

◆ lumiera_plugin_struct

Function Documentation

◆ lumiera_plugin_new()

◆ lumiera_plugin_init()

◆ lumiera_plugin_error()

◆ lumiera_plugin_handle()

◆ lumiera_plugin_name()

◆ lumiera_plugin_refinc()

◆ lumiera_plugin_refdec()

◆ lumiera_plugin_discover()

◆ lumiera_plugin_load()

◆ lumiera_plugin_register()

◆ lumiera_plugin_unload()

◆ lumiera_plugin_lookup()

Variable Documentation

◆ lumiera_plugin_types