static int check_mem_dirty_track(void)
{
if (kerndat_get_dirty_track() < 0)
return -1;
if (!kdat.has_dirty_track)
pr_warn("Dirty tracking is OFF. Memory snapshot will not work.\n");
return 0;
}
/*
* Generic function to handle CRIU_REQ_TYPE__FEATURE_CHECK.
*
* The function will have resp.sucess = true for most cases
* and the actual result will be in resp.features.
*
* For each feature which has been requested in msg->features
* the corresponding parameter will be set in resp.features.
*/
static int handle_feature_check(int sk, CriuReq * msg)
{
CriuResp resp = CRIU_RESP__INIT;
CriuFeatures feat = CRIU_FEATURES__INIT;
bool success = false;
int pid, status;
/* enable setting of an optional message */
feat.has_mem_track = 1;
feat.mem_track = false;
/*
* Check if the requested feature check can be answered.
*
* This function is right now hard-coded to memory
* tracking detection and needs other/better logic to
* handle multiple feature checks.
*/
if (msg->features->has_mem_track != 1) {
pr_warn("Feature checking for unknown feature.\n");
goto out;
}
/*
* From this point on the function will always
* 'succeed'. If the requested features are supported
* can be seen if the requested optional parameters are
* set in the message 'criu_features'.
*/
success = true;
pid = fork();
if (pid < 0) {
pr_perror("Can't fork");
goto out;
}
if (pid == 0) {
int ret = 1;
if (setup_opts_from_req(sk, msg->opts))
goto cout;
setproctitle("feature-check --rpc -D %s", images_dir);
kerndat_get_dirty_track();
if (kdat.has_dirty_track)
ret = 0;
cout:
exit(ret);
}
wait(&status);
if (!WIFEXITED(status) || WEXITSTATUS(status))
goto out;
feat.mem_track = true;
out:
resp.features = &feat;
resp.type = msg->type;
resp.success = success;
return send_criu_msg(sk, &resp);
}
