criu/include/plugin.h

#ifndef __CR_PLUGIN_H__
#define __CR_PLUGIN_H__

#include "criu-plugin.h"
#include "compiler.h"
#include "list.h"

#define CR_PLUGIN_DEFAULT "/var/lib/criu/"

void cr_plugin_fini(int stage, int err);
int cr_plugin_init(int stage);

typedef struct {
	struct list_head	head;
	struct list_head	hook_chain[CR_PLUGIN_HOOK__MAX];
} cr_plugin_ctl_t;

extern cr_plugin_ctl_t cr_plugin_ctl;

typedef struct {
	cr_plugin_desc_t	*d;
	struct list_head	list;
	void			*dlhandle;
	struct list_head	link[CR_PLUGIN_HOOK__MAX];
} plugin_desc_t;

#define run_plugins(__hook, ...)								\
({												\
	plugin_desc_t *this;									\
	int __ret = -ENOTSUP;									\
												\
	list_for_each_entry(this, &cr_plugin_ctl.hook_chain[CR_PLUGIN_HOOK__ ##__hook],		\
			    link[CR_PLUGIN_HOOK__ ##__hook]) {					\
		pr_debug("plugin: `%s' hook %u -> %p\n",					\
			 this->d->name, CR_PLUGIN_HOOK__ ##__hook,				\
			 this->d->hooks[CR_PLUGIN_HOOK__ ##__hook]);				\
		__ret = ((CR_PLUGIN_HOOK__ ##__hook ##_t *)					\
			 this->d->hooks[CR_PLUGIN_HOOK__ ##__hook])(__VA_ARGS__);		\
		if (__ret == -ENOTSUP)								\
			continue;								\
		break;										\
	}											\
	__ret;											\
})

#endif