From cd333165f30224cb1e2a3c637fc97adf0feeb3b8 Mon Sep 17 00:00:00 2001
From: Adit Makwana <adit.makwana@emocean.io>
Date: Thu, 16 Feb 2023 10:17:17 +0100
Subject: [PATCH] rewrite error for real error after closesocket()

---
 src/bsd.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/bsd.c b/src/bsd.c
index 33ecb443..fff69340 100644
--- a/src/bsd.c
+++ b/src/bsd.c
@@ -300,10 +300,17 @@ LIBUS_SOCKET_DESCRIPTOR bsd_create_socket(int domain, int type, int protocol) {
 }
 
 void bsd_close_socket(LIBUS_SOCKET_DESCRIPTOR fd) {
+    // errno is rewritten by close(fd), and the actual error number is lost.
 #ifdef _WIN32
+    DWORD error;
+    error = GetLastError();
     closesocket(fd);
+    SetLastError(error);
 #else
+    int error; 
+    error = errno;
     close(fd);
+    errno = error;
 #endif
 }