From e79d06d595e05553fde3c5b8d229ae4ad12977dd Mon Sep 17 00:00:00 2001
From: Max Kellermann <max@musicpd.org>
Date: Wed, 31 Oct 2018 17:12:21 +0100
Subject: [PATCH] fs/io/FileOutputStream: don't use O_TMPFILE on Android

Fixes writing to Context.getCacheDir().
---
 src/fs/io/FileOutputStream.hxx | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/fs/io/FileOutputStream.hxx b/src/fs/io/FileOutputStream.hxx
index 08ffef2d6..aec4001fe 100644
--- a/src/fs/io/FileOutputStream.hxx
+++ b/src/fs/io/FileOutputStream.hxx
@@ -46,7 +46,12 @@
 #include <windows.h>
 #endif
 
-#ifdef __linux__
+#if defined(__linux__) && !defined(ANDROID)
+/* we don't use O_TMPFILE on Android because Android's braindead
+   SELinux policy disallows hardlinks
+   (https://android.googlesource.com/platform/external/sepolicy/+/85ce2c7),
+   even hardlinks from /proc/self/fd/*, which however is required to
+   use O_TMPFILE */
 #define HAVE_O_TMPFILE
 #endif