[newlib-cygwin] Cygwin: AF_UNIX: fix creating shared mem region in dup

[Corinna Vinschen]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=92b8b300c26c20ea441f69b36da9a838aa85c2d8

commit 92b8b300c26c20ea441f69b36da9a838aa85c2d8
Author: Corinna Vinschen <corinna@vinschen.de>
Date:   Fri Feb 28 12:39:41 2020 +0100

    Cygwin: AF_UNIX: fix creating shared mem region in dup
    
    reopen_shmem is accidentally called on the parent fhandler
    rather than the child fhandler, and it's called too early.
    Make sure to call it on the child and only after its shmem_handle
    is valid.
    
    Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

Diff:
---
 winsup/cygwin/fhandler_socket_unix.cc | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/winsup/cygwin/fhandler_socket_unix.cc b/winsup/cygwin/fhandler_socket_unix.cc
index eea7e76..824bcba 100644
--- a/winsup/cygwin/fhandler_socket_unix.cc
+++ b/winsup/cygwin/fhandler_socket_unix.cc
@@ -1201,12 +1201,6 @@ fhandler_socket_unix::dup (fhandler_base *child, int flags)
       return -1;
     }
   fhandler_socket_unix *fhs = (fhandler_socket_unix *) child;
-  if (reopen_shmem () < 0)
-    {
-      __seterrno ();
-      fhs->close ();
-      return -1;
-    }
   if (backing_file_handle && backing_file_handle != INVALID_HANDLE_VALUE
       && !DuplicateHandle (GetCurrentProcess (), backing_file_handle,
 			    GetCurrentProcess (), &fhs->backing_file_handle,
@@ -1224,6 +1218,12 @@ fhandler_socket_unix::dup (fhandler_base *child, int flags)
       fhs->close ();
       return -1;
     }
+  if (fhs->reopen_shmem () < 0)
+    {
+      __seterrno ();
+      fhs->close ();
+      return -1;
+    }
   fhs->sun_path (sun_path ());
   fhs->peer_sun_path (peer_sun_path ());
   fhs->connect_wait_thr = NULL;