From 9756f79f044767052280bcc7d7d1225b1f326698 Mon Sep 17 00:00:00 2001
From: Jeffrey Pfau <jeffrey@endrift.com>
Date: Wed, 19 Oct 2016 13:52:51 -0700
Subject: [PATCH] VFS: Call msync when syncing mapped data

---
 CHANGES               | 1 +
 src/util/vfs/vfs-fd.c | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/CHANGES b/CHANGES
index 15d2c24c6..274125f91 100644
--- a/CHANGES
+++ b/CHANGES
@@ -19,6 +19,7 @@ Misc:
  - GBA Video: Clean up unused timers
  - Test: Add a basic test suite
  - GBA Video: Allow multiple handles into the same tile cache
+ - VFS: Call msync when syncing mapped data
 
 0.5.1: (2016-10-05)
 Bugfixes:
diff --git a/src/util/vfs/vfs-fd.c b/src/util/vfs/vfs-fd.c
index 5b96f58b5..2b0f418c9 100644
--- a/src/util/vfs/vfs-fd.c
+++ b/src/util/vfs/vfs-fd.c
@@ -167,6 +167,9 @@ static bool _vfdSync(struct VFile* vf, const void* buffer, size_t size) {
 	struct VFileFD* vfd = (struct VFileFD*) vf;
 #ifndef _WIN32
 	futimes(vfd->fd, NULL);
+	if (buffer && size) {
+		return msync(buffer, size, MS_SYNC) == 0;
+	}
 	return fsync(vfd->fd) == 0;
 #else
 	HANDLE h = (HANDLE) _get_osfhandle(vfd->fd);