From 3ec2d32c69022ab0b192b9c553e93f860019f802 Mon Sep 17 00:00:00 2001
From: chenxiaobin19 <1025221611@qq.com>
Date: Sat, 9 Oct 2021 17:51:23 +0800
Subject: [PATCH] stop retry when the send buffer is full for nonblocking
 SSL_write

---
 src/common/backend/libpq/be-secure.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/common/backend/libpq/be-secure.cpp b/src/common/backend/libpq/be-secure.cpp
index 24a0dc72e..bbd89cdca 100644
--- a/src/common/backend/libpq/be-secure.cpp
+++ b/src/common/backend/libpq/be-secure.cpp
@@ -344,6 +344,11 @@ ssize_t secure_write(Port* port, void* ptr, size_t len)
                 break;
             case SSL_ERROR_WANT_READ:
             case SSL_ERROR_WANT_WRITE:
+                if (port->noblock) {
+                    errno = EWOULDBLOCK;
+                    n = -1;
+                    break;
+                }
 #ifdef WIN32
                 pgwin32_waitforsinglesocket(SSL_get_fd(port->ssl),
                     (err == SSL_ERROR_WANT_READ) ? (FD_READ | FD_CLOSE) : (FD_WRITE | FD_CLOSE),