From d13be1b439f58949018f13ee1b1d5c258b6b24d9 Mon Sep 17 00:00:00 2001
From: Vladimir Dubrovin <3proxy@3proxy.ru>
Date: Wed, 26 Aug 2026 16:40:31 +0300
Subject: [PATCH] Return Windows behavior for socket copy

---
 CMakeLists.txt | 3 +++
 Makefile.msvc  | 2 +-
 Makefile.win   | 3 +++
 3 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 632dd89..a567b9d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -115,6 +115,9 @@ set(CMAKE_POSITION_INDEPENDENT_CODE ON)
 if(WIN32)
     # Windows-specific configuration
     add_compile_definitions(
+        # Windows does not take a recv and a send on one socket from two
+        # threads, so a UDP service answers from a socket of its own
+        NO_SHARE_UDP_SOCKET
         WIN32
         _WIN32
         _MBCS
diff --git a/Makefile.msvc b/Makefile.msvc
index fa04294..cae7ce5 100644
--- a/Makefile.msvc
+++ b/Makefile.msvc
@@ -18,7 +18,7 @@ SSL_LIBS = wolfssl.lib
 SSL_DEFS = /D "WITH_SSL"
 SSL_LIBS = libcrypto.lib libssl.lib
 !ENDIF
-CFLAGS = /D "WITH_HTTPSRV" /nologo /MT /W3 /Ox /GS /EHs- /GA /GF /D "MSVC"  /D "WITH_WSAPOLL" /D "NDEBUG" /D "WIN32" $(SSL_DEFS) /D "WITH_PCRE" /D "WITH_ODBC" /D "_CONSOLE" /D "_MBCS" /D "_WIN32" /Fp"proxy.pch" /FD /c $(BUILDDATE) $(VERSION)
+CFLAGS = /D "WITH_HTTPSRV" /nologo /MT /W3 /Ox /GS /EHs- /GA /GF /D "MSVC"  /D "WITH_WSAPOLL" /D "NDEBUG" /D "WIN32" $(SSL_DEFS) /D "WITH_PCRE" /D "WITH_ODBC" /D "_CONSOLE" /D "_MBCS" /D "_WIN32" /D "NO_SHARE_UDP_SOCKET" /Fp"proxy.pch" /FD /c $(BUILDDATE) $(VERSION)
 COUT = /Fo
 LN = link
 LDFLAGS =  /nologo /subsystem:console /incremental:no
diff --git a/Makefile.win b/Makefile.win
index 8d7ba30..065cb77 100644
--- a/Makefile.win
+++ b/Makefile.win
@@ -11,6 +11,9 @@ CRYPT_PREFIX ?= $(PREFIX)
 CC ?= gcc
 CFLAGS ?= -O3 -flto
 CFLAGS += -fno-strict-aliasing -c -mthreads  -DWITH_WSAPOLL -DWITH_ODBC
+# Windows does not take a recv and a send on one socket from two threads,
+# so a UDP service answers from a socket of its own
+CFLAGS += -DNO_SHARE_UDP_SOCKET
 COUT = -o 
 LN ?= $(CC)
 LDFLAGS ?= -O3 -flto