From 7c6c62a195a704376c394f38aa30bd0f6a3eee5e Mon Sep 17 00:00:00 2001
From: Greg Eisenhauer <eisen@cc.gatech.edu>
Date: Mon, 15 Jan 2024 20:01:50 -0500
Subject: [PATCH] Only fail on EOF when we know it's OK

---
 source/adios2/engine/bp5/BP5Reader.cpp              | 12 ++++++++++++
 source/adios2/toolkit/transport/file/FilePOSIX.cpp  | 12 +++++++++++-
 source/adios2/toolkit/transport/file/FilePOSIX.h    |  5 +++--
 source/adios2/toolkit/transportman/TransportMan.cpp | 10 ++++++++--
 source/adios2/toolkit/transportman/TransportMan.h   |  9 +++++++--
 5 files changed, 41 insertions(+), 7 deletions(-)

diff --git a/source/adios2/engine/bp5/BP5Reader.cpp b/source/adios2/engine/bp5/BP5Reader.cpp
index 00209ff1f4..4544863f7f 100644
--- a/source/adios2/engine/bp5/BP5Reader.cpp
+++ b/source/adios2/engine/bp5/BP5Reader.cpp
@@ -214,6 +214,12 @@ std::pair<double, double> BP5Reader::ReadData(adios2::transportman::TransportMan
 
     // check if subfile is already opened
     TP startSubfile = NOW();
+    static bool checkOnce = true;
+    if (checkOnce)
+    {
+        checkOnce = false;
+        CheckWriterActive();
+    }
     if (FileManager.m_Transports.count(SubfileNum) == 0)
     {
         const std::string subFileName =
@@ -225,6 +231,12 @@ std::pair<double, double> BP5Reader::ReadData(adios2::transportman::TransportMan
         }
         FileManager.OpenFileID(subFileName, SubfileNum, Mode::Read, m_IO.m_TransportsParameters[0],
                                /*{{"transport", "File"}},*/ false);
+        if (!m_WriterIsActive)
+        {
+            Params transportParameters;
+            transportParameters["FailOnEOF"] = "true";
+            FileManager.SetParameters(transportParameters);
+        }
     }
     TP endSubfile = NOW();
     double timeSubfile = DURATION(startSubfile, endSubfile);
diff --git a/source/adios2/toolkit/transport/file/FilePOSIX.cpp b/source/adios2/toolkit/transport/file/FilePOSIX.cpp
index e3a77f452a..8d27d93a43 100644
--- a/source/adios2/toolkit/transport/file/FilePOSIX.cpp
+++ b/source/adios2/toolkit/transport/file/FilePOSIX.cpp
@@ -7,6 +7,7 @@
  */
 #include "FilePOSIX.h"
 #include "adios2/helper/adiosLog.h"
+#include "adios2/helper/adiosString.h"
 
 #ifdef ADIOS2_HAVE_O_DIRECT
 #ifndef _GNU_SOURCE
@@ -415,7 +416,7 @@ void FilePOSIX::Read(char *buffer, size_t size, size_t start)
                     "Toolkit", "transport::file::FilePOSIX", "Read",
                     "couldn't read from file " + m_Name + " " + SysErrMsg());
             }
-            else if (readSize == 0)
+            else if ((readSize == 0) && m_FailOnEOF)
             {
                 helper::Throw<std::ios_base::failure>(
                     "Toolkit", "transport::file::FilePOSIX", "Read",
@@ -599,5 +600,14 @@ void FilePOSIX::Truncate(const size_t length)
 
 void FilePOSIX::MkDir(const std::string &fileName) {}
 
+void FilePOSIX::SetParameters(const Params &params)
+{
+    // Parameters are set from config parameters if present
+    // Otherwise, they are set from environment if present
+    // Otherwise, they remain at their default value
+
+    helper::GetParameter(params, "FailOnEOF", m_FailOnEOF);
+}
+
 } // end namespace transport
 } // end namespace adios2
diff --git a/source/adios2/toolkit/transport/file/FilePOSIX.h b/source/adios2/toolkit/transport/file/FilePOSIX.h
index 394aa9ea15..667d63cd0a 100644
--- a/source/adios2/toolkit/transport/file/FilePOSIX.h
+++ b/source/adios2/toolkit/transport/file/FilePOSIX.h
@@ -4,8 +4,6 @@
  *
  * FileDescriptor.h wrapper of POSIX library functions for file I/O
  *
- *  Created on: Oct 6, 2016
- *      Author: William F Godoy godoywf@ornl.gov
  */
 
 #ifndef ADIOS2_TOOLKIT_TRANSPORT_FILE_FILEDESCRIPTOR_H_
@@ -68,10 +66,13 @@ class FilePOSIX : public Transport
 
     void MkDir(const std::string &fileName) final;
 
+    void SetParameters(const Params &params) final;
+
 private:
     /** POSIX file handle returned by Open */
     int m_FileDescriptor = -1;
     int m_Errno = 0;
+    bool m_FailOnEOF = false; // default to false for historic reasons
     bool m_IsOpening = false;
     std::future<int> m_OpenFuture;
     bool m_DirectIO = false;
diff --git a/source/adios2/toolkit/transportman/TransportMan.cpp b/source/adios2/toolkit/transportman/TransportMan.cpp
index bb7ff8666d..aefd6820d7 100644
--- a/source/adios2/toolkit/transportman/TransportMan.cpp
+++ b/source/adios2/toolkit/transportman/TransportMan.cpp
@@ -4,8 +4,6 @@
  *
  * TransportMan.cpp
  *
- *  Created on: May 23, 2017
- *      Author: William F Godoy godoywf@ornl.gov
  */
 
 #include "TransportMan.h"
@@ -410,6 +408,14 @@ void TransportMan::ReadFile(char *buffer, const size_t size, const size_t start,
     itTransport->second->Read(buffer, size, start);
 }
 
+void TransportMan::SetParameters(const Params &params, const size_t transportIndex)
+{
+    auto itTransport = m_Transports.find(transportIndex);
+    CheckFile(itTransport,
+              ", in call to SetParameters with index " + std::to_string(transportIndex));
+    itTransport->second->SetParameters(params);
+}
+
 void TransportMan::FlushFiles(const int transportIndex)
 {
     if (transportIndex == -1)
diff --git a/source/adios2/toolkit/transportman/TransportMan.h b/source/adios2/toolkit/transportman/TransportMan.h
index acf3ac1cd2..f9bb34a89c 100644
--- a/source/adios2/toolkit/transportman/TransportMan.h
+++ b/source/adios2/toolkit/transportman/TransportMan.h
@@ -4,8 +4,6 @@
  *
  * TransportMan.h : manages a vector of transports
  *
- *  Created on: May 23, 2017
- *      Author: William F Godoy godoywf@ornl.gov
  */
 
 #ifndef ADIOS2_TOOLKIT_TRANSPORT_TRANSPORTMANAGER_H_
@@ -210,6 +208,13 @@ class TransportMan
      */
     bool FileExists(const std::string &name, const Params &parameters, const bool profile);
 
+    /**
+     * Set Transport Paramers
+     * @param params
+     * @param transportIndex
+     */
+    void SetParameters(const Params &params, const size_t transportIndex = 0);
+
 protected:
     core::IO &m_IO;
     helper::Comm const &m_Comm;