From e99182dab3093f1645f9e4ff216aa752d7443fb1 Mon Sep 17 00:00:00 2001
From: Laurent Bercot <ska-skaware@skarnet.org>
Date: Thu, 1 Jan 2026 13:47:45 +0000
Subject:  Save/restore errno in all safe wrappers

---
 src/libstddjb/fd_copy.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

(limited to 'src/libstddjb/fd_copy.c')

diff --git a/src/libstddjb/fd_copy.c b/src/libstddjb/fd_copy.c
index 80b887e..1afad1f 100644
--- a/src/libstddjb/fd_copy.c
+++ b/src/libstddjb/fd_copy.c
@@ -2,14 +2,16 @@
 
 #include <unistd.h>
 #include <errno.h>
+
 #include <skalibs/djbunix.h>
 
 int fd_copy (int to, int from)
 {
+  int e = errno ;
   int r ;
   if (to == from) return (errno = EINVAL, -1) ;
-  do
-    r = dup2(from, to) ;
-  while ((r == -1) && (errno == EINTR)) ;
+  do r = dup2(from, to) ;
+  while (r == -1 && errno == EINTR) ;
+  if (r >= 0) errno = e ;
   return r ;
 }
-- 
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