From 97641d17e754daf5bc2745ebd2d311b5dbf89d05 Mon Sep 17 00:00:00 2001
From: jiangheng12 <jiangheng14@huawei.com>
Date: Fri, 10 Mar 2023 17:39:03 +0800
Subject: [PATCH] send should return -1, errno EAGAIN when ring full

---
 src/lstack/core/lstack_lwip.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/lstack/core/lstack_lwip.c b/src/lstack/core/lstack_lwip.c
index baaa18b..b9f97e0 100644
--- a/src/lstack/core/lstack_lwip.c
+++ b/src/lstack/core/lstack_lwip.c
@@ -507,7 +507,8 @@ ssize_t write_stack_data(struct lwip_sock *sock, const void *buf, size_t len)
     if (sock->remain_len) {
         send_len = merge_data_lastpbuf(sock, (char *)buf, len);
         if (send_len >= len) {
-            return len;
+            send_len = len;
+            goto END;
         }
     }
 
@@ -531,7 +532,7 @@ ssize_t write_stack_data(struct lwip_sock *sock, const void *buf, size_t len)
             }
         }
         sock->remain_len = 0;
-        return send_len;
+        goto END;
     }
 
     /* send_ring have idle */
@@ -545,6 +546,11 @@ ssize_t write_stack_data(struct lwip_sock *sock, const void *buf, size_t len)
         del_data_out_event(sock);
     }
 
+END:
+    if (send_len == 0) {
+        errno = EAGAIN;
+        return -1;
+    }
     return send_len;
 }
 
-- 
2.33.0