From d039a4e91eb805ea688467e8e4643cbbcf81f35e Mon Sep 17 00:00:00 2001
From: wu-changsheng <wuchangsheng2@huawei.com>
Date: Sun, 9 Oct 2022 10:31:16 +0800
Subject: [PATCH] fix read stack data return 0 when no data

---
 src/lstack/core/lstack_lwip.c | 6 +++++-
 src/ltran/ltran_tcp_conn.h    | 1 +
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/lstack/core/lstack_lwip.c b/src/lstack/core/lstack_lwip.c
index 60e30d9..8c1df26 100644
--- a/src/lstack/core/lstack_lwip.c
+++ b/src/lstack/core/lstack_lwip.c
@@ -642,10 +642,14 @@ ssize_t read_stack_data(int32_t fd, void *buf, size_t len, int32_t flags)
         GAZELLE_RETURN(EINVAL);
     }
 
-    if (sock->errevent > 0 && !NETCONN_IS_DATAIN(sock)) {
+    if (sock->errevent > 0) {
         return 0;
     }
 
+    if (!NETCONN_IS_DATAIN(sock)) {
+        GAZELLE_RETURN(EAGAIN);
+    }
+
     while (recv_left > 0) {
         if (sock->recv_lastdata) {
             pbuf = sock->recv_lastdata;
diff --git a/src/ltran/ltran_tcp_conn.h b/src/ltran/ltran_tcp_conn.h
index 2b6e6ea..fa508bc 100644
--- a/src/ltran/ltran_tcp_conn.h
+++ b/src/ltran/ltran_tcp_conn.h
@@ -15,6 +15,7 @@
 
 #include <lwip/hlist.h>
 #include <stdint.h>
+#include <stdbool.h>
 #include <lwip/reg_sock.h>
 
 #include "gazelle_opt.h"
-- 
2.23.0