From 03334bb123829150ad97069e123ca5a8d2b8e1c7 Mon Sep 17 00:00:00 2001
From: Christopher Kohlhoff <chris@kohlhoff.com>
Date: Tue, 5 Apr 2022 17:20:01 +1000
Subject: [PATCH] For UNIX domain sockets on linux, connect() may yield EAGAIN
 to indicate an in-progress operation.

---
 include/boost/asio/detail/impl/socket_ops.ipp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/include/boost/asio/detail/impl/socket_ops.ipp b/include/boost/asio/detail/impl/socket_ops.ipp
index ba4c8c4372..44c40a6931 100644
--- a/include/boost/asio/detail/impl/socket_ops.ipp
+++ b/include/boost/asio/detail/impl/socket_ops.ipp
@@ -482,7 +482,12 @@ int connect(socket_type s, const socket_addr_type* addr,
   get_last_error(ec, result != 0);
 #if defined(__linux__)
   if (result != 0 && ec == boost::asio::error::try_again)
-    ec = boost::asio::error::no_buffer_space;
+  {
+    if (addr->sa_family == AF_UNIX)
+      ec = boost::asio::error::in_progress;
+    else
+      ec = boost::asio::error::no_buffer_space;
+  }
 #endif // defined(__linux__)
   return result;
 }