From 8649dfd8df4f0d840a64c1d6c5fc80b8e94a68d1 Mon Sep 17 00:00:00 2001
From: Edward Thomson <ethomson@edwardthomson.com>
Date: Tue, 29 Sep 2015 13:36:37 -0400
Subject: [PATCH] p_futimes: support using futimens when available

---
 CMakeLists.txt   |  6 ++++++
 src/unix/posix.h | 15 ++++++++++++++-
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6c03c718c7e..a0ef89f760c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -19,6 +19,7 @@ CMAKE_POLICY(SET CMP0015 NEW)
 SET(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_CURRENT_SOURCE_DIR}/cmake/Modules/")
 
 INCLUDE(CheckLibraryExists)
+INCLUDE(CheckFunctionExists)
 INCLUDE(AddCFlagIfSupported)
 INCLUDE(FindPkgConfig)
 
@@ -431,6 +432,11 @@ ELSE ()
 	ADD_C_FLAG_IF_SUPPORTED(-Wno-unused-const-variable)
 	ADD_C_FLAG_IF_SUPPORTED(-Wno-unused-function)
 
+	CHECK_FUNCTION_EXISTS(futimens HAVE_FUTIMENS)
+	IF (HAVE_FUTIMENS)
+		ADD_DEFINITIONS(-DHAVE_FUTIMENS)
+	ENDIF ()
+
 	IF (APPLE) # Apple deprecated OpenSSL
 		ADD_C_FLAG_IF_SUPPORTED(-Wno-deprecated-declarations)
 	ENDIF()
diff --git a/src/unix/posix.h b/src/unix/posix.h
index 7773509907f..6633689bcfc 100644
--- a/src/unix/posix.h
+++ b/src/unix/posix.h
@@ -22,7 +22,6 @@ typedef int GIT_SOCKET;
 #define p_stat(p,b) stat(p, b)
 
 #define p_utimes(f, t) utimes(f, t)
-#define p_futimes(f, t) futimes(f, t)
 
 #define p_readlink(a, b, c) readlink(a, b, c)
 #define p_symlink(o,n) symlink(o, n)
@@ -53,4 +52,18 @@ extern char *p_realpath(const char *, char *);
 #define p_localtime_r(c, r) localtime_r(c, r)
 #define p_gmtime_r(c, r) gmtime_r(c, r)
 
+#ifdef HAVE_FUTIMENS
+GIT_INLINE(int) p_futimes(int f, const struct timeval t[2])
+{
+	struct timespec s[2];
+	s[0].tv_sec = t[0].tv_sec;
+	s[0].tv_nsec = t[0].tv_usec * 1000;
+	s[1].tv_sec = t[1].tv_sec;
+	s[1].tv_nsec = t[1].tv_usec * 1000;
+	return futimens(f, s);
+}
+#else
+# define p_futimes futimes
+#endif
+
 #endif