criu/lib/criu.h

/*
 * (C) Copyright 2013 Parallels, Inc. (www.parallels.com).
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Lesser General Public License
 * (LGPL) version 2.1 which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/lgpl-2.1.html
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, you can find it here:
 * www.gnu.org/licenses/lgpl.html
 */

#ifndef __CRIU_LIB_H__
#define __CRIU_LIB_H__

#include <stdbool.h>

void criu_set_service_address(char *path);

/*
 * Set opts to defaults. _Must_ be called first before using any functions from
 * the list down below. 0 on success, -1 on fail.
 */
int criu_init_opts(void);

void criu_set_pid(int pid);
void criu_set_images_dir_fd(int fd); /* must be set for dump/restore */
void criu_set_parent_images(char *path);
void criu_set_work_dir_fd(int fd);
void criu_set_leave_running(bool leave_running);
void criu_set_ext_unix_sk(bool ext_unix_sk);
void criu_set_tcp_established(bool tcp_established);
void criu_set_evasive_devices(bool evasive_devices);
void criu_set_shell_job(bool shell_job);
void criu_set_file_locks(bool file_locks);
void criu_set_track_mem(bool track_mem);
void criu_set_auto_dedup(bool auto_dedup);
void criu_set_force_irmap(bool force_irmap);
void criu_set_link_remap(bool link_remap);
void criu_set_log_level(int log_level);
void criu_set_log_file(char *log_file);
void criu_set_cpu_cap(unsigned int cap);
void criu_set_root(char *root);
void criu_set_manage_cgroups(bool manage);
int criu_set_exec_cmd(int argc, char *argv[]);
int criu_add_ext_mount(char *key, char *val);
int criu_add_veth_pair(char *in, char *out);
int criu_add_cg_root(char *ctrl, char *path);

/*
 * The criu_notify_arg_t na argument is an opaque
 * value that callbacks (cb-s) should pass into
 * criu_notify_xxx() calls to fetch arbitrary values
 * from notification. If the value is not available
 * some non-existing one is reported.
 */

typedef struct _CriuNotify *criu_notify_arg_t;
void criu_set_notify_cb(int (*cb)(char *action, criu_notify_arg_t na));

/* Get pid of root task. 0 if not available */
int criu_notify_pid(criu_notify_arg_t na);

/* Here is a table of return values and errno's of functions
 * from the list down below.
 *
 * Return value  errno                Description
 * ----------------------------------------------------------------------------
 * 0             undefined            Success.
 *
 * >0            undefined            Success(criu_restore() only).
 *
 * -BADE         rpc err  (0 for now) RPC has returned fail.
 *
 * -ECONNREFUSED errno                Unable to connect to CRIU.
 *
 * -ECOMM        errno                Unable to send/recv msg to/from CRIU.
 *
 * -EINVAL       undefined            CRIU doesn't support this type of request.
 *                                    You should probably update CRIU.
 *
 * -EBADMSG      undefined            Unexpected response from CRIU.
 *                                    You should probably update CRIU.
 */
int criu_check(void);
int criu_dump(void);
int criu_restore(void);
int criu_restore_child(void);

/*
 * Perform dumping but with preliminary iterations. Each
 * time an iteration ends the ->more callback is called.
 * The callback's return value is
 *   - positive -- one more iteration starts
 *   - zero     -- final dump is performed and call exits
 *   - negative -- dump is aborted, the value is returned
 *     back from criu_dump_iters
 *
 * The @pi argument is an opaque value that caller may
 * use to request pre-dump statistics (not yet implemented).
 */
typedef void *criu_predump_info;
int criu_dump_iters(int (*more)(criu_predump_info pi));

#endif /* __CRIU_LIB_H__ */