From ad43aa10b27f8ce0f88f8167515b1be5685157e3 Mon Sep 17 00:00:00 2001
From: Valient Gough <vgough@pobox.com>
Date: Fri, 13 May 2016 13:33:23 -0700
Subject: [PATCH] use utimensat if available

---
 CMakeLists.txt  | 3 ++-
 encfs/encfs.cpp | 4 ++++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index ecffbaa..aa37223 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -83,9 +83,10 @@ check_cxx_source_compiles ("#include <sys/types.h>
   " XATTR_ADD_OPT)
 set (CMAKE_REQUIRED_QUIET ${CMAKE_REQUIRED_QUIET_SAVE})
 
-# Check if we have lchmod.
+# Check if we have some standard functions.
 include (CheckFuncs)
 check_function_exists_glibc (lchmod HAVE_LCHMOD)
+check_function_exists_glibc (utimensat HAVE_UTIMENSAT)
 
 set (CMAKE_THREAD_PREFER_PTHREAD)
 find_package (Threads REQUIRED)
diff --git a/encfs/encfs.cpp b/encfs/encfs.cpp
index c97a545..31d3e7d 100644
--- a/encfs/encfs.cpp
+++ b/encfs/encfs.cpp
@@ -497,6 +497,9 @@ int encfs_utime(const char *path, struct utimbuf *buf) {
 
 int _do_utimens(EncFS_Context *, const string &cyName,
                 const struct timespec ts[2]) {
+#ifdef HAVE_UTIMENSAT
+  int res = utimensat(AT_FDCWD, cyName.c_str(), ts, AT_SYMLINK_NOFOLLOW);
+#else
   struct timeval tv[2];
   tv[0].tv_sec = ts[0].tv_sec;
   tv[0].tv_usec = ts[0].tv_nsec / 1000;
@@ -504,6 +507,7 @@ int _do_utimens(EncFS_Context *, const string &cyName,
   tv[1].tv_usec = ts[1].tv_nsec / 1000;
 
   int res = lutimes(cyName.c_str(), tv);
+#endif
   return (res == -1) ? -errno : ESUCCESS;
 }