service: Add support for check request

Signed-off-by: Ruslan Kuprieiev <kupruser@gmail.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

cr-service.c

@@ -217,6 +217,16 @@ exit:
 	return success ? 0 : 1;
 }
 
+static int check(int sk)
+{
+	CriuResp resp = CRIU_RESP__INIT;
+
+	if (!cr_check())
+		resp.success = true;
+
+	return send_criu_msg(sk, &resp);
+}
+
 static int cr_service_work(int sk)
 {
 	CriuReq *msg = 0;
@@ -233,6 +243,8 @@ static int cr_service_work(int sk)
 		return dump_using_req(sk, msg->opts);
 	case CRIU_REQ_TYPE__RESTORE:
 		return restore_using_req(sk, msg->opts);
+	case CRIU_REQ_TYPE__CHECK:
+		return check(sk);
 
 	default: {
 		CriuResp resp = CRIU_RESP__INIT;

protobuf/rpc.proto

@@ -24,6 +24,7 @@ enum criu_req_type {
 	EMPTY		= 0;
 	DUMP		= 1;
 	RESTORE		= 2;
+	CHECK		= 3;
 }
 
 /*