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criu-plugin.h
/* * This file defines types and macros for CRIU plugins. * Copyright (C) 2013-2014 Parallels, Inc * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef __CRIU_PLUGIN_H__ #define __CRIU_PLUGIN_H__ #include <limits.h> #include <stdbool.h> #define CRIU_PLUGIN_GEN_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c)) #define CRIU_PLUGIN_VERSION_MAJOR 0 #define CRIU_PLUGIN_VERSION_MINOR 2 #define CRIU_PLUGIN_VERSION_SUBLEVEL 0 #define CRIU_PLUGIN_VERSION_OLD CRIU_PLUGIN_GEN_VERSION(0,1,0) #define CRIU_PLUGIN_VERSION \ CRIU_PLUGIN_GEN_VERSION(CRIU_PLUGIN_VERSION_MAJOR, \ CRIU_PLUGIN_VERSION_MINOR, \ CRIU_PLUGIN_VERSION_SUBLEVEL) /* * Plugin hook points and their arguments in hooks. */ enum { CR_PLUGIN_HOOK__DUMP_UNIX_SK = 0, CR_PLUGIN_HOOK__RESTORE_UNIX_SK = 1, CR_PLUGIN_HOOK__DUMP_EXT_FILE = 2, CR_PLUGIN_HOOK__RESTORE_EXT_FILE = 3, CR_PLUGIN_HOOK__DUMP_EXT_MOUNT = 4, CR_PLUGIN_HOOK__RESTORE_EXT_MOUNT = 5, CR_PLUGIN_HOOK__DUMP_EXT_LINK = 6, CR_PLUGIN_HOOK__MAX }; #define DECLARE_PLUGIN_HOOK_ARGS(__hook, ...) \ typedef int (__hook ##_t)(__VA_ARGS__) DECLARE_PLUGIN_HOOK_ARGS(CR_PLUGIN_HOOK__DUMP_UNIX_SK, int fd, int id); DECLARE_PLUGIN_HOOK_ARGS(CR_PLUGIN_HOOK__RESTORE_UNIX_SK, int id); DECLARE_PLUGIN_HOOK_ARGS(CR_PLUGIN_HOOK__DUMP_EXT_FILE, int fd, int id); DECLARE_PLUGIN_HOOK_ARGS(CR_PLUGIN_HOOK__RESTORE_EXT_FILE, int id); DECLARE_PLUGIN_HOOK_ARGS(CR_PLUGIN_HOOK__DUMP_EXT_MOUNT, char *mountpoint, int id); DECLARE_PLUGIN_HOOK_ARGS(CR_PLUGIN_HOOK__RESTORE_EXT_MOUNT, int id, char *mountpoint, char *old_root, int *is_file); DECLARE_PLUGIN_HOOK_ARGS(CR_PLUGIN_HOOK__DUMP_EXT_LINK, int index, int type, char *kind); enum { CR_PLUGIN_STAGE__DUMP, CR_PLUGIN_STAGE__PRE_DUMP, CR_PLUGIN_STAGE__RESTORE, CR_PLUGIN_STAGE_MAX }; /* * Plugin descriptor. */ typedef struct { const char *name; int (*init)(int stage); void (*exit)(int stage, int ret); unsigned int version; unsigned int max_hooks; void *hooks[CR_PLUGIN_HOOK__MAX]; } cr_plugin_desc_t; extern cr_plugin_desc_t CR_PLUGIN_DESC; #define CR_PLUGIN_REGISTER(___name, ___init, ___exit) \ cr_plugin_desc_t CR_PLUGIN_DESC = { \ .name = ___name, \ .init = ___init, \ .exit = ___exit, \ .version = CRIU_PLUGIN_VERSION, \ .max_hooks = CR_PLUGIN_HOOK__MAX, \ }; static inline int cr_plugin_dummy_init(int stage) { return 0; } static inline void cr_plugin_dummy_exit(int stage, int ret) { } #define CR_PLUGIN_REGISTER_DUMMY(___name) \ cr_plugin_desc_t CR_PLUGIN_DESC = { \ .name = ___name, \ .init = cr_plugin_dummy_init, \ .exit = cr_plugin_dummy_exit, \ .version = CRIU_PLUGIN_VERSION, \ .max_hooks = CR_PLUGIN_HOOK__MAX, \ }; #define CR_PLUGIN_REGISTER_HOOK(__hook, __func) \ static void __attribute__((constructor)) cr_plugin_register_hook_##__func (void) \ { \ CR_PLUGIN_DESC.hooks[__hook] = (void *)__func; \ } /* Public API */ extern int criu_get_image_dir(void); /* * Deprecated, will be removed in next version. */ typedef int (cr_plugin_init_t)(void); typedef void (cr_plugin_fini_t)(void); typedef int (cr_plugin_dump_unix_sk_t)(int fd, int id); typedef int (cr_plugin_restore_unix_sk_t)(int id); typedef int (cr_plugin_dump_file_t)(int fd, int id); typedef int (cr_plugin_restore_file_t)(int id); typedef int (cr_plugin_dump_ext_mount_t)(char *mountpoint, int id); typedef int (cr_plugin_restore_ext_mount_t)(int id, char *mountpoint, char *old_root, int *is_file); typedef int (cr_plugin_dump_ext_link_t)(int index, int type, char *kind); #endif /* __CRIU_PLUGIN_H__ */