/*  */
#define PLUGIN_VERSION_LISTENER ((double)0.1)
#define PLUGIN_VERSION_BACKEND  ((double)0.1)

#define LISTENER_VER_SYM listener_plugin_version
#define BACKEND_VER_SYM backend_plugin_version
#define LISTENER_INFO_SYM listener_plugin_info
#define BACKEND_INFO_SYM backend_plugin_info
#define LISTENER_VER_STR "listener_plugin_version"
#define BACKEND_VER_STR "backend_plugin_version"
#define LISTENER_INFO_STR "listener_plugin_info"
#define BACKEND_INFO_STR "backend_plugin_info"




typedef void * listener_context_t;
typedef void * backend_context_t;

/* These callbacks hand requests off to the
   appropriate backend. */
   
/* Do nothing.  Returns 1 (failure) to caller */
typedef int (*fence_null_callback)(const char *vm_name,
				   void *priv);

/* Turn the VM 'off'.  Returns 0 to caller if successful or
   nonzero if unsuccessful. */
typedef int (*fence_off_callback)(const char *vm_name, uint32_t seqno,
				  void *priv);

/* Turn the VM 'on'.  Returns 0 to caller if successful or
   nonzero if unsuccessful. */
typedef int (*fence_on_callback)(const char *vm_name, uint32_t seqno,
				 void *priv);

/* Reboot a VM.  Returns 0 to caller if successful or
   nonzero if unsuccessful. */
typedef int (*fence_reboot_callback)(const char *vm_name, uint32_t seqno,
				     void *priv);

/* Get status of a VM.  Returns 0 to caller if VM is alive or
   nonzero if VM is not alive. */
typedef int (*fence_status_callback)(const char *vm_name,
				     void *priv);

/* Get status of backend.  Returns 0 to caller if backend
   is responding to requests. */
typedef int (*fence_devstatus_callback)(void *priv);

typedef int (*backend_init_fn)(backend_context_t *c,
    			       config_object_t *config);
typedef int (*backend_cleanup_fn)(backend_context_t c);

typedef struct _fence_callbacks {
	fence_null_callback null;
	fence_off_callback off;
	fence_on_callback on;
	fence_reboot_callback reboot;
	fence_status_callback status;
	fence_devstatus_callback devstatus;
} fence_callbacks_t;

typedef struct backend_plugin {
	const char *name;
	const char *version;
	const fence_callbacks_t *callbacks;
	backend_init_fn init;
	backend_cleanup_fn cleanup;
} backend_plugin_t;


typedef int (*listener_init_fn)(listener_context_t *c,
				const fence_callbacks_t *cb,
				config_object_t *config, 
				void *priv);
typedef int (*listener_dispatch_fn)(listener_context_t c,
				    struct timeval *timeout);
typedef int (*listener_cleanup_fn)(listener_context_t c);


typedef struct listener_plugin {
	const char *name;
	const char *version;
	listener_init_fn init;
	listener_dispatch_fn dispatch;
	listener_cleanup_fn cleanup;
} listener_plugin_t;


typedef enum {
	PLUGIN_NONE = 0,
	PLUGIN_LISTENER = 1,
	PLUGIN_BACKEND = 2
} plugin_type_t;

int plugin_reg_backend(const backend_plugin_t *plugin);
int plugin_reg_listener(const listener_plugin_t *plugin);
const backend_plugin_t *plugin_find_backend(const char *name);
const listener_plugin_t *plugin_find_listener(const char *name);

void plugin_dump(void);
#ifdef _MODULE
int plugin_load(const char *filename);
int plugin_search(const char *pathname);
#endif