From f1ac28b0aa1f20c5eb50a5122f51ff2c5b99a304 Mon Sep 17 00:00:00 2001
From: Bill Zissimopoulos <billziss@navimatics.com>
Date: Sat, 6 May 2017 23:39:58 -0700
Subject: [PATCH] dotnet: log exceptions

---
 src/dotnet/FileSystemBase.cs | 1 +
 src/dotnet/Interop.cs        | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/src/dotnet/FileSystemBase.cs b/src/dotnet/FileSystemBase.cs
index e7f98aa5..afe944ce 100644
--- a/src/dotnet/FileSystemBase.cs
+++ b/src/dotnet/FileSystemBase.cs
@@ -50,6 +50,7 @@ namespace Fsp
         /* operations */
         public virtual Int32 ExceptionHandler(Exception ex)
         {
+            Api.FspDebugLog("%s\n", ex.ToString());
             return STATUS_UNEXPECTED_IO_ERROR;
         }
         public virtual Int32 Init(Object Host)
diff --git a/src/dotnet/Interop.cs b/src/dotnet/Interop.cs
index 5c395087..d90737e6 100644
--- a/src/dotnet/Interop.cs
+++ b/src/dotnet/Interop.cs
@@ -595,6 +595,10 @@ namespace Fsp.Interop
             internal delegate UInt32 FspWin32FromNtStatus(
                 Int32 Status);
             [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
+            internal delegate void FspDebugLog(
+                [MarshalAs(UnmanagedType.LPStr)] String Format,
+                [MarshalAs(UnmanagedType.LPStr)] String Message);
+            [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
             internal delegate void FspDebugLogSetHandle(
                 IntPtr Handle);
 
@@ -658,6 +662,7 @@ namespace Fsp.Interop
         internal static Proto.FspVersion FspVersion;
         internal static Proto.FspNtStatusFromWin32 FspNtStatusFromWin32;
         internal static Proto.FspWin32FromNtStatus FspWin32FromNtStatus;
+        internal static Proto.FspDebugLog FspDebugLog;
         internal static Proto.FspDebugLogSetHandle FspDebugLogSetHandle;
 
         internal static unsafe Int32 FspFileSystemSetMountPointEx(
@@ -950,6 +955,7 @@ namespace Fsp.Interop
             FspVersion = GetEntryPoint<Proto.FspVersion>(Module);
             FspNtStatusFromWin32 = GetEntryPoint<Proto.FspNtStatusFromWin32>(Module);
             FspWin32FromNtStatus = GetEntryPoint<Proto.FspWin32FromNtStatus>(Module);
+            FspDebugLog = GetEntryPoint<Proto.FspDebugLog>(Module);
             FspDebugLogSetHandle = GetEntryPoint<Proto.FspDebugLogSetHandle>(Module);
         }
         private static void CheckVersion()