diff --git a/src/exec.c b/src/exec.c
index 1fa18ec..b5cff2e 100644
--- a/src/exec.c
+++ b/src/exec.c
@@ -551,8 +551,7 @@ int hyper_release_exec(struct hyper_exec *exec,
 
 		if (pod->type == STOPPOD) {
 			/* stop pod manually */
-			hyper_send_type(ctl.chan.fd, ACK);
-
+			hyper_send_msg_block(ctl.chan.fd, ACK, 0, NULL);
 		} else {
 			/* send out pod finish message, hyper will decide if restart pod or not */
 			hyper_send_pod_finished(pod);
diff --git a/src/init.c b/src/init.c
index 8925278..d12f0bf 100644
--- a/src/init.c
+++ b/src/init.c
@@ -516,7 +516,7 @@ static int hyper_setup_container(struct hyper_pod *pod)
 	fprintf(stdout, "pod init pid %d\n", pod->init_pid);
 
 	/* Wait for container start */
-	if (hyper_get_type_block(arg.ctl_pipe[0], &type) < 0) {
+	if (hyper_get_type(arg.ctl_pipe[0], &type) < 0) {
 		perror("get container init ready message failed");
 		goto out;
 	}
@@ -1183,9 +1183,9 @@ static int hyper_channel_handle(struct hyper_event *de, uint32_t len)
 	}
 
 	if (ret < 0)
-		hyper_send_type(de->fd, ERROR);
+		hyper_send_msg_block(de->fd, ERROR, 0, NULL);
 	else
-		hyper_send_msg(de->fd, ACK, datalen, data);
+		hyper_send_msg_block(de->fd, ACK, datalen, data);
 
 	free(data);
 	return 0;
diff --git a/src/net.c b/src/net.c
index 865af9f..b4810c1 100644
--- a/src/net.c
+++ b/src/net.c
@@ -112,9 +112,9 @@ int hyper_get_type(int fd, uint32_t *type)
 	return 0;
 }
 
-int hyper_get_type_block(int fd, uint32_t *type)
+int hyper_send_msg_block(int fd, uint32_t type, uint32_t len, uint8_t *data)
 {
-	int ret = 0, flags;
+	int ret, flags;
 
 	flags = hyper_setfd_block(fd);
 	if (flags < 0) {
@@ -122,10 +122,7 @@ int hyper_get_type_block(int fd, uint32_t *type)
 		return -1;
 	}
 
-	ret = hyper_get_type(fd, type);
-	if (ret < 0) {
-		fprintf(stderr, "%s can not get type\n", __func__);
-	}
+	ret = hyper_send_msg(fd, type, len, data);
 
 	if (fcntl(fd, F_SETFL, flags) < 0) {
 		perror("restore fd flag failed");
@@ -135,43 +132,6 @@ int hyper_get_type_block(int fd, uint32_t *type)
 	return ret;
 }
 
-int hyper_send_type_block(int fd, uint32_t type, int need_ack)
-{
-	int ret = 0, flags;
-	uint32_t t;
-
-	flags = hyper_setfd_block(fd);
-	if (flags < 0) {
-		fprintf(stderr, "%s fail to set fd block\n", __func__);
-		return -1;
-	}
-
-	ret = hyper_send_msg(fd, type, 0, NULL);
-	if (ret < 0)
-		goto out;
-
-	if (need_ack == 0)
-		goto out;
-
-	ret = hyper_get_type(fd, &t);
-	if (ret < 0) {
-		fprintf(stderr, "can not get type\n");
-		goto out;
-	}
-
-	fprintf(stdout, "get type %" PRIu32"\n", type);
-
-	if (t != ACK)
-		ret = -1;
-out:
-	if (fcntl(fd, F_SETFL, flags) < 0) {
-		perror("restore fd flag failed");
-		return -1;
-	}
-
-	return ret;
-}
-
 static int get_addr_ipv4(uint8_t *ap, const char *cp)
 {
 	int i;
diff --git a/src/net.h b/src/net.h
index e096f21..c16fb8b 100644
--- a/src/net.h
+++ b/src/net.h
@@ -51,10 +51,9 @@ void hyper_cleanup_network(struct hyper_pod *pod);
 int hyper_setup_dns(struct hyper_pod *pod);
 void hyper_cleanup_dns(struct hyper_pod *pod);
 int hyper_get_type(int fd, uint32_t *type);
-int hyper_get_type_block(int fd, uint32_t *type);
 int hyper_send_type(int fd, uint32_t type);
 int hyper_send_type_block(int fd, uint32_t type, int need_ack);
-int hyper_send_msg(int fd, uint32_t type, uint32_t len,
-		 uint8_t *message);
+int hyper_send_msg(int fd, uint32_t type, uint32_t len, uint8_t *data);
+int hyper_send_msg_block(int fd, uint32_t type, uint32_t len, uint8_t *data);
 int hyper_send_data(int fd, uint8_t *data, uint32_t len);
 #endif
diff --git a/src/util.c b/src/util.c
index 225375e..ea2f1a8 100644
--- a/src/util.c
+++ b/src/util.c
@@ -401,7 +401,7 @@ int hyper_send_pod_finished(struct hyper_pod *pod)
 		data = new;
 	}
 
-	ret = hyper_send_msg(ctl.chan.fd, PODFINISHED, c_num * 4, data);
+	ret = hyper_send_msg_block(ctl.chan.fd, PODFINISHED, c_num * 4, data);
 out:
 	free(data);
 	return ret;