!814 [sync] PR-782: support udp recv zero packets

From: @openeuler-sync-bot 
Reviewed-by: @jiangheng12 
Signed-off-by: @jiangheng12

0109-support-udp-recv-zero-packets.patch

@@ -0,0 +1,25 @@
+From cbde011450b38359d494bcc18ae91c690e5c5d43 Mon Sep 17 00:00:00 2001
+From: yangchen <yangchen145@huawei.com>
+Date: Fri, 26 Jan 2024 17:28:29 +0800
+Subject: [PATCH] support udp recv zero packets
+
+---
+ src/api/sockets.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/api/sockets.c b/src/api/sockets.c
+index d8b41e4..c133fc2 100644
+--- a/src/api/sockets.c
++++ b/src/api/sockets.c
+@@ -1385,7 +1385,7 @@ lwip_recvfrom_udp_raw(struct lwip_sock *sock, int flags, struct msghdr *msg, u16
+   LWIP_UNUSED_ARG(copied);
+   LWIP_UNUSED_ARG(i);
+   buflen = do_lwip_read_from_lwip(sock, flags, apiflags);
+-  if (buflen <= 0) {
++  if (buflen < 0) {
+     return ERR_BUF;
+   }
+ 
+-- 
+2.33.0
+

lwip.spec

@@ -4,7 +4,7 @@
 Summary: lwip is a small independent implementation of the TCP/IP protocol suite
 Name:    lwip
 Version: 2.1.3
-Release: 114
+Release: 115
 License: BSD
 URL:     http://savannah.nongnu.org/projects/lwip/
 Source0: http://download.savannah.nongnu.org/releases/lwip/%{name}-%{version}.zip
@@ -125,6 +125,7 @@ Patch9104:  0105-delete-redundant-logs-in-lwip.patch
 Patch9105:  0106-remove-unnecessary-variables-in-struct-pbuf.patch
 Patch9106:  0107-fix-move-lpcb-to-the-front-of-list-error.patch
 Patch9107:  0108-fix-receive-fin-packet-process-error.patch
+Patch9108:  0109-support-udp-recv-zero-packets.patch
 
 BuildRequires: gcc-c++ dos2unix dpdk-devel
 
@@ -154,6 +155,9 @@ cd %{_builddir}/%{name}-%{version}/src
 %{_libdir}/liblwip.a
 
 %changelog
+* Thu Feb 01 2024 yangchen <yangchen145@huawei.com> - 2.1.3-115
+- support udp recv zero packets
+
 * Tue Jan 30 2024 jiangheng <jiangheng14@huawei.com> - 2.1.3-114
 - fix receive fin packet process error