From a5be8e2c3f9cdbf0725d7b25ab3255249253e9e8 Mon Sep 17 00:00:00 2001
From: Stefan Eissing <stefan@eissing.org>
Date: Tue, 15 Apr 2025 14:01:19 +0200
Subject: [PATCH] tool_cb_write.c: handle EINTR on flush

Report-and-patch-by: Nils Goroll
Fixes #17061
Closes #17063
---
 src/tool_cb_wrt.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/tool_cb_wrt.c b/src/tool_cb_wrt.c
index 7a575c98f6..1cd0524df6 100644
--- a/src/tool_cb_wrt.c
+++ b/src/tool_cb_wrt.c
@@ -364,7 +364,12 @@ size_t tool_write_cb(char *buffer, size_t sz, size_t nmemb, void *userdata)
 
   if(config->nobuffer) {
     /* output buffering disabled */
-    int res = fflush(outs->stream);
+    int res;
+    do {
+      res = fflush(outs->stream);
+      /* Keep retrying in the hope that it is not interrupted sometime */
+      /* !checksrc! disable ERRNOVAR 1 */
+    } while(res && errno == EINTR);
     if(res)
       return CURL_WRITEFUNC_ERROR;
   }