From eee030f6bc62117b4d3c27aa78818964d95a7063 Mon Sep 17 00:00:00 2001
From: Cory Fields <cory-nospam-@coryfields.com>
Date: Thu, 25 Sep 2014 19:25:19 -0400
Subject: [PATCH 1/2] autofile: don't copy CAutoFile by value

---
 src/init.cpp                  | 2 +-
 src/main.cpp                  | 8 ++++----
 src/net.cpp                   | 4 ++--
 src/test/checkblock_tests.cpp | 2 +-
 4 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/src/init.cpp b/src/init.cpp
index 7299bd0f4..27594ecbe 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -1058,7 +1058,7 @@ bool AppInit2(boost::thread_group& threadGroup)
     }
 
     boost::filesystem::path est_path = GetDataDir() / FEE_ESTIMATES_FILENAME;
-    CAutoFile est_filein = CAutoFile(fopen(est_path.string().c_str(), "rb"), SER_DISK, CLIENT_VERSION);
+    CAutoFile est_filein(fopen(est_path.string().c_str(), "rb"), SER_DISK, CLIENT_VERSION);
     // Allowed to fail as this file IS missing on first startup.
     if (est_filein)
         mempool.ReadFeeEstimates(est_filein);
diff --git a/src/main.cpp b/src/main.cpp
index 15c3916a6..60e2a5679 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1082,7 +1082,7 @@ bool GetTransaction(const uint256 &hash, CTransaction &txOut, uint256 &hashBlock
 bool WriteBlockToDisk(CBlock& block, CDiskBlockPos& pos)
 {
     // Open history file to append
-    CAutoFile fileout = CAutoFile(OpenBlockFile(pos), SER_DISK, CLIENT_VERSION);
+    CAutoFile fileout(OpenBlockFile(pos), SER_DISK, CLIENT_VERSION);
     if (!fileout)
         return error("WriteBlockToDisk : OpenBlockFile failed");
 
@@ -1110,7 +1110,7 @@ bool ReadBlockFromDisk(CBlock& block, const CDiskBlockPos& pos)
     block.SetNull();
 
     // Open history file to read
-    CAutoFile filein = CAutoFile(OpenBlockFile(pos, true), SER_DISK, CLIENT_VERSION);
+    CAutoFile filein(OpenBlockFile(pos, true), SER_DISK, CLIENT_VERSION);
     if (!filein)
         return error("ReadBlockFromDisk : OpenBlockFile failed");
 
@@ -4503,7 +4503,7 @@ bool SendMessages(CNode* pto, bool fSendTrickle)
 bool CBlockUndo::WriteToDisk(CDiskBlockPos &pos, const uint256 &hashBlock)
 {
     // Open history file to append
-    CAutoFile fileout = CAutoFile(OpenUndoFile(pos), SER_DISK, CLIENT_VERSION);
+    CAutoFile fileout(OpenUndoFile(pos), SER_DISK, CLIENT_VERSION);
     if (!fileout)
         return error("CBlockUndo::WriteToDisk : OpenUndoFile failed");
 
@@ -4535,7 +4535,7 @@ bool CBlockUndo::WriteToDisk(CDiskBlockPos &pos, const uint256 &hashBlock)
 bool CBlockUndo::ReadFromDisk(const CDiskBlockPos &pos, const uint256 &hashBlock)
 {
     // Open history file to read
-    CAutoFile filein = CAutoFile(OpenUndoFile(pos, true), SER_DISK, CLIENT_VERSION);
+    CAutoFile filein(OpenUndoFile(pos, true), SER_DISK, CLIENT_VERSION);
     if (!filein)
         return error("CBlockUndo::ReadFromDisk : OpenBlockFile failed");
 
diff --git a/src/net.cpp b/src/net.cpp
index ab547e2fd..866bac2c0 100644
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -1957,7 +1957,7 @@ bool CAddrDB::Write(const CAddrMan& addr)
     // open temp output file, and associate with CAutoFile
     boost::filesystem::path pathTmp = GetDataDir() / tmpfn;
     FILE *file = fopen(pathTmp.string().c_str(), "wb");
-    CAutoFile fileout = CAutoFile(file, SER_DISK, CLIENT_VERSION);
+    CAutoFile fileout(file, SER_DISK, CLIENT_VERSION);
     if (!fileout)
         return error("%s : Failed to open file %s", __func__, pathTmp.string());
 
@@ -1982,7 +1982,7 @@ bool CAddrDB::Read(CAddrMan& addr)
 {
     // open input file, and associate with CAutoFile
     FILE *file = fopen(pathAddr.string().c_str(), "rb");
-    CAutoFile filein = CAutoFile(file, SER_DISK, CLIENT_VERSION);
+    CAutoFile filein(file, SER_DISK, CLIENT_VERSION);
     if (!filein)
         return error("%s : Failed to open file %s", __func__, pathAddr.string());
 
diff --git a/src/test/checkblock_tests.cpp b/src/test/checkblock_tests.cpp
index fdea12846..67d40a45c 100644
--- a/src/test/checkblock_tests.cpp
+++ b/src/test/checkblock_tests.cpp
@@ -35,7 +35,7 @@ bool read_block(const std::string& filename, CBlock& block)
 
     fseek(fp, 8, SEEK_SET); // skip msgheader/size
 
-    CAutoFile filein = CAutoFile(fp, SER_DISK, CLIENT_VERSION);
+    CAutoFile filein(fp, SER_DISK, CLIENT_VERSION);
     if (!filein) return false;
 
     filein >> block;

From 6eb67b0ed2b350b772f7edb67aee1bcf09c91b0b Mon Sep 17 00:00:00 2001
From: Cory Fields <cory-nospam-@coryfields.com>
Date: Thu, 25 Sep 2014 19:25:47 -0400
Subject: [PATCH 2/2] autofile: Disallow by-value copies of CAutoFile

One might assume that CAutoFile would be ref-counted so that a copied object
would delay closing the underlying file until all copies have gone out of
scope. Since that's not the case with CAutoFile, explicitly disable copying.
---
 src/serialize.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/serialize.h b/src/serialize.h
index 447d808de..7f8f93328 100644
--- a/src/serialize.h
+++ b/src/serialize.h
@@ -1154,7 +1154,7 @@ public:
 
 
 
-/** RAII wrapper for FILE*.
+/** Non-refcounted RAII wrapper for FILE*.
  *
  * Will automatically close the file when it goes out of scope if not null.
  * If you're returning the file pointer, return file.release().
@@ -1162,6 +1162,10 @@ public:
  */
 class CAutoFile
 {
+private:
+    // Disallow copies
+    CAutoFile(const CAutoFile&);
+    CAutoFile& operator=(const CAutoFile&);
 protected:
     FILE* file;
 public: