Save/restore errno in all safe wrappers

1 files changed, 5 insertions, 3 deletions

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 ;
 }