From 35a1a6dbdf03df1e33bae51f679820a3a868d0c0 Mon Sep 17 00:00:00 2001
From: Ken Brown <kbrown@cornell.edu>
Date: Fri, 27 Dec 2019 11:43:58 -0500
Subject: [PATCH] Cygwin: allow opening a symlink with O_PATH | O_NOFOLLOW

Up to now, opening a symlink with O_NOFOLLOW fails with ELOOP.
Following Linux, allow this to succeed if O_PATH is also specified.
---
 winsup/cygwin/syscalls.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/winsup/cygwin/syscalls.cc b/winsup/cygwin/syscalls.cc
index 20126ce10..038a316db 100644
--- a/winsup/cygwin/syscalls.cc
+++ b/winsup/cygwin/syscalls.cc
@@ -1470,7 +1470,7 @@ open (const char *unix_path, int flags, ...)
 
       if (!(fh = build_fh_name (unix_path, opt, stat_suffixes)))
 	__leave;		/* errno already set */
-      if ((flags & O_NOFOLLOW) && fh->issymlink ())
+      if ((flags & O_NOFOLLOW) && fh->issymlink () && !(flags & O_PATH))
 	{
 	  set_errno (ELOOP);
 	  __leave;