From faea58f73c1286fee87205533722cad67c7bc846 Mon Sep 17 00:00:00 2001
From: chenBright <chenguangmingfe@foxmail.com>
Date: Tue, 24 Mar 2026 17:18:36 +0800
Subject: [PATCH] Fix DoRead() returns error errno

---
 src/brpc/socket.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/brpc/socket.cpp b/src/brpc/socket.cpp
index c123fb6b6e..da926c9ff5 100644
--- a/src/brpc/socket.cpp
+++ b/src/brpc/socket.cpp
@@ -2106,12 +2106,14 @@ ssize_t Socket::DoRead(size_t size_hint) {
                          << ": " << SSLError(e);
             errno = ESSL;
         } else {
+            int saved_errno = errno;
             // System error with corresponding errno set.
             bool is_fatal_error = (ssl_error != SSL_ERROR_ZERO_RETURN &&
                                    ssl_error != SSL_ERROR_SYSCALL) ||
-                                   BIO_fd_non_fatal_error(errno) != 0 ||
+                                   BIO_fd_non_fatal_error(saved_errno) != 0 ||
                                   nr < 0;
             PLOG_IF(WARNING, is_fatal_error) << "Fail to read from ssl_fd=" << fd();
+            errno = saved_errno;
         }
         break;
     }