From 6387b528961010b09e20fe807b5207ca7bf821f9 Mon Sep 17 00:00:00 2001
From: Max Kellermann <max@duempel.org>
Date: Tue, 24 Mar 2015 21:51:34 +0100
Subject: fs/io/FileOutputStream: seek end-of-file in AppendFileOutputStream
 ctor

---
 src/fs/io/FileOutputStream.cxx | 6 ++++++
 src/fs/io/FileOutputStream.hxx | 6 ++++++
 2 files changed, 12 insertions(+)

diff --git a/src/fs/io/FileOutputStream.cxx b/src/fs/io/FileOutputStream.cxx
index 82d9c3dc1..c7410f180 100644
--- a/src/fs/io/FileOutputStream.cxx
+++ b/src/fs/io/FileOutputStream.cxx
@@ -226,6 +226,12 @@ AppendFileOutputStream::AppendFileOutputStream(Path _path, Error &error)
 	if (!IsDefined())
 		error.FormatLastError("Failed to append to %s",
 				      GetPath().ToUTF8().c_str());
+
+	if (!SeekEOF()) {
+		error.FormatLastError("Failed seek end-of-file of %s",
+				      GetPath().ToUTF8().c_str());
+		Close();
+	}
 #else
 	if (!SetFD().Open(GetPath().c_str(),
 			  O_WRONLY|O_APPEND))
diff --git a/src/fs/io/FileOutputStream.hxx b/src/fs/io/FileOutputStream.hxx
index 9decb6f00..6756de99e 100644
--- a/src/fs/io/FileOutputStream.hxx
+++ b/src/fs/io/FileOutputStream.hxx
@@ -95,6 +95,12 @@ protected:
 #endif
 	}
 
+#ifdef WIN32
+	bool SeekEOF() {
+		return SetFilePointer(handle, 0, nullptr, FILE_END);
+	}
+#endif
+
 public:
 	bool IsDefined() const {
 #ifdef WIN32
-- 
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