From 980b8cef6b3fa8c2d0d428731d1f8164cadf91ca Mon Sep 17 00:00:00 2001
From: Todd White <todd.white@thalion.global>
Date: Thu, 13 Aug 2026 21:52:25 -0400
Subject: [PATCH] Set the send timeout the way Winsock expects

Winsock takes SO_SNDTIMEO as a DWORD of milliseconds rather than a
struct timeval, and its optval is const char* rather than const void*.
Casting the timeval compiles and then sets the timeout from the wrong bytes,
so the value is built per platform.
---
 Source/CFSocket.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/Source/CFSocket.c b/Source/CFSocket.c
index ff83842..7e84b52 100644
--- a/Source/CFSocket.c
+++ b/Source/CFSocket.c
@@ -581,16 +581,28 @@ CFSocketSendData (CFSocketRef s, CFDataRef address, CFDataRef data,
   struct sockaddr* addr = NULL;
   socklen_t len;
   int err;
+#if defined(_WIN32)
+  DWORD tv;
+#else
   struct timeval tv;
+#endif
   
   if (CFSocketIsValid (s) == false || address == NULL || data == NULL)
     return kCFSocketError;
   
+#if defined(_WIN32)
+  /* Winsock expects a DWORD of milliseconds here, not a struct timeval.
+   */
+  tv = (DWORD) (timeout * 1000.0);
+  err = setsockopt(s->_socket, SOL_SOCKET, SO_SNDTIMEO, (const char*) &tv,
+                   sizeof(tv));
+#else
   tv.tv_sec = (int) floor(timeout);
   tv.tv_usec = (timeout - tv.tv_sec) * 1000000;
-  
+
   err = setsockopt(s->_socket, SOL_SOCKET, SO_SNDTIMEO, &tv,
                    sizeof(struct timeval));
+#endif
   
   if (err != 0)
     return kCFSocketError;