void makeACheckpoint(int signum){
//Reserved to check for funtions's errors
int ret;
//Check if criu need to be initalized
if(last_time == 0){
//Preparation for CRIU for the first time:
//Create the "checkpoints" directory if it doesn't exist, only owner has (full) access
mkdir("checkpoints", 0700);
//Set CRIU options
setCriuOptions();
}
//Make a checkpoint
ret = criu_dump();
if(ret < 0){
perror("Error: criu_dump failed!");
} else{
printf("\nSuccessfully took huge dump!\n");
}
//Set last_time to this time
last_time = time(0);
if(last_time < 0)
perror("Error: the function 'time' failed to set 'last_time'");
}
int main(int argc, char **argv)
{
int pid, ret, fd, p[2];
printf("--- Start loop ---\n");
pipe(p);
pid = fork();
if (pid < 0) {
perror("Can't");
return -1;
}
if (!pid) {
printf(" `- loop: initializing\n");
if (setsid() < 0)
exit(1);
if (signal(SIGUSR1, sh) == SIG_ERR)
exit(1);
close(0);
close(1);
close(2);
close(p[0]);
ret = SUCC_ECODE;
write(p[1], &ret, sizeof(ret));
close(p[1]);
while (!stop)
sleep(1);
exit(SUCC_ECODE);
}
close(p[1]);
/* Wait for kid to start */
ret = -1;
read(p[0], &ret, sizeof(ret));
if (ret != SUCC_ECODE) {
printf("Error starting loop\n");
goto err;
}
/* Wait for pipe to get closed, then dump */
read(p[0], &ret, 1);
close(p[0]);
printf("--- Dump loop ---\n");
criu_init_opts();
criu_set_service_address(argv[1]);
criu_set_pid(pid);
criu_set_log_file("dump.log");
criu_set_log_level(4);
fd = open(argv[2], O_DIRECTORY);
criu_set_images_dir_fd(fd);
ret = criu_dump();
if (ret < 0) {
what_err_ret_mean(ret);
kill(pid, SIGKILL);
goto err;
}
printf(" `- Dump succeeded\n");
waitpid(pid, NULL, 0);
printf("--- Restore loop ---\n");
criu_init_opts();
criu_set_log_level(4);
criu_set_log_file("restore.log");
criu_set_images_dir_fd(fd);
pid = criu_restore_child();
if (pid <= 0) {
what_err_ret_mean(pid);
return -1;
}
printf(" `- Restore returned pid %d\n", pid);
kill(pid, SIGUSR1);
err:
if (waitpid(pid, &ret, 0) < 0) {
perror(" Can't wait kid");
return -1;
}
return chk_exit(ret, SUCC_ECODE);
}
int opal_crs_criu_checkpoint(pid_t pid, opal_crs_base_snapshot_t *base_snapshot,
opal_crs_base_ckpt_options_t *options,
opal_crs_state_type_t *state)
{
int ret;
int fd = 0;
int oh = mca_crs_criu_component.super.output_handle;
opal_crs_criu_snapshot_t *snapshot = NULL;
char *dest = NULL;
opal_output_verbose(10, oh, "crs:criu: checkpoint(%d, ---)", pid);
snapshot = (opal_crs_criu_snapshot_t *)base_snapshot;
snapshot->super.component_name = strdup(mca_crs_criu_component.super.base_version.mca_component_name);
if (NULL == snapshot->super.metadata) {
if (NULL == (snapshot->super.metadata = fopen(snapshot->super.metadata_filename, "a"))) {
opal_output(oh, "crs:criu: checkpoint(): Error: Unable to open the file (%s)",
snapshot->super.metadata_filename);
*state = OPAL_CRS_ERROR;
goto cleanup;
}
}
fprintf(snapshot->super.metadata, "%s%s\n", CRS_METADATA_COMP, snapshot->super.component_name);
fclose(snapshot->super.metadata);
snapshot->super.metadata = NULL;
ret = criu_init_opts();
if (ret < 0) {
criu_error(ret, pid);
*state = OPAL_CRS_ERROR;
goto cleanup;
}
opal_output_verbose(10, oh, "crs:criu: criu_init_opts() returned %d", ret);
dest = snapshot->super.snapshot_directory;
opal_output_verbose(10, oh, "crs:criu: opening snapshot directory %s", dest);
fd = open(dest, O_DIRECTORY);
if (fd < 0) {
*state = OPAL_CRS_ERROR;
opal_output(oh, "crs:criu: checkpoint(): Error: Unable to open checkpoint "
"directory (%s) for pid (%d)", dest, pid);
goto cleanup;
}
/* http://criu.org/C_API */
criu_set_images_dir_fd(fd);
criu_set_pid(pid);
criu_set_log_file(mca_crs_criu_component.log_file);
criu_set_log_level(mca_crs_criu_component.log_level);
criu_set_tcp_established(mca_crs_criu_component.tcp_established);
criu_set_shell_job(mca_crs_criu_component.shell_job);
criu_set_ext_unix_sk(mca_crs_criu_component.ext_unix_sk);
criu_set_leave_running(mca_crs_criu_component.leave_running);
ret = criu_dump();
if (ret < 0) {
criu_error(ret, pid);
*state = OPAL_CRS_ERROR;
goto cleanup;
}
*state = OPAL_CRS_CONTINUE;
cleanup:
if (fd > 0) {
close(fd);
}
if (OPAL_CRS_ERROR == *state) {
return OPAL_ERROR;
}
return OPAL_SUCCESS;
}
int main(int argc, char *argv[])
{
int ret, fd;
criu_set_service_address("criu_service.socket");
puts("--- Check ---");
ret = criu_check();
if (ret < 0) {
what_err_ret_mean(ret);
return -1;
} else
puts("Success");
puts("--- Dump loop ---");
criu_init_opts();
criu_set_pid(atoi(argv[1]));
criu_set_log_file("dump.log");
criu_set_log_level(4);
fd = open("imgs_loop", O_DIRECTORY);
criu_set_images_dir_fd(fd);
ret = criu_dump();
if (ret < 0) {
what_err_ret_mean(ret);
return -1;
} else if (ret == 0)
puts("Success");
puts("--- Restore loop ---");
criu_init_opts();
criu_set_log_level(4);
criu_set_log_file("restore.log");
criu_set_images_dir_fd(fd);
ret = criu_restore();
if (ret < 0) {
what_err_ret_mean(ret);
return -1;
} else if (ret > 0) {
puts("Success");
printf("pid %d\n", ret);
}
puts("--- Dump myself ---");
criu_init_opts();
criu_set_leave_running(true);
criu_set_shell_job(true);
criu_set_images_dir_fd(open("imgs_test", O_DIRECTORY));
ret = criu_dump();
if (ret < 0) {
what_err_ret_mean(ret);
return -1;
} else {
puts("Success");
if (ret == 1)
puts("Restored");
}
return 0;
}