Port fixes for CoreCLR 1.0.0 RTM

dir.props

@@ -138,7 +138,7 @@
 
   <!-- Packaging properties -->
   <PropertyGroup>
-    <PreReleaseLabel>rc3</PreReleaseLabel>
+    <PreReleaseLabel>servicing</PreReleaseLabel>
     <PackageDescriptionFile>$(SourceDir).nuget/descriptions.json</PackageDescriptionFile>
     <PackageLicenseFile>$(SourceDir).nuget/dotnet_library_license.txt</PackageLicenseFile>
     <PackageThirdPartyNoticesFile>$(SourceDir).nuget/ThirdPartyNotices.txt</PackageThirdPartyNoticesFile>

src/.nuget/Microsoft.NETCore.ILAsm/Microsoft.NETCore.ILAsm.pkgproj

@@ -3,7 +3,7 @@
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
 
   <PropertyGroup>
-    <Version>1.0.2</Version>
+    <Version>1.0.3</Version>
     <SkipPackageFileCheck>true</SkipPackageFileCheck>
     <SkipValidatePackage>true</SkipValidatePackage>
     <PackagePlatforms>x64;x86;arm</PackagePlatforms>

src/.nuget/Microsoft.NETCore.ILAsm/debian/Microsoft.NETCore.ILAsm.pkgproj

@@ -3,7 +3,7 @@
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
 
   <PropertyGroup>
-    <Version>1.0.2</Version>
+    <Version>1.0.3</Version>
     <SkipPackageFileCheck>true</SkipPackageFileCheck>
     <PackageTargetRuntime>debian.8-$(PackagePlatform)</PackageTargetRuntime>
     <!-- only build for x64 -->

src/.nuget/Microsoft.NETCore.ILAsm/fedora/23/Microsoft.NETCore.ILAsm.pkgproj

@@ -3,7 +3,7 @@
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
 
   <PropertyGroup>
-    <Version>1.0.2</Version>
+    <Version>1.0.3</Version>
     <SkipPackageFileCheck>true</SkipPackageFileCheck>
     <PackageTargetRuntime>fedora.23-$(PackagePlatform)</PackageTargetRuntime>
     <!-- only build for x64 -->

src/.nuget/Microsoft.NETCore.ILAsm/opensuse/13.2/Microsoft.NETCore.ILAsm.pkgproj

@@ -3,7 +3,7 @@
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
 
   <PropertyGroup>
-    <Version>1.0.2</Version>
+    <Version>1.0.3</Version>
     <SkipPackageFileCheck>true</SkipPackageFileCheck>
     <PackageTargetRuntime>opensuse.13.2-$(PackagePlatform)</PackageTargetRuntime>
     <!-- only build for x64 -->

src/.nuget/Microsoft.NETCore.ILAsm/osx/Microsoft.NETCore.ILAsm.pkgproj

@@ -3,7 +3,7 @@
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
 
   <PropertyGroup>
-    <Version>1.0.2</Version>
+    <Version>1.0.3</Version>
     <SkipPackageFileCheck>true</SkipPackageFileCheck>
     <PackageTargetRuntime>osx.10.10-$(PackagePlatform)</PackageTargetRuntime>
     <!-- only build for x64 -->

src/.nuget/Microsoft.NETCore.ILAsm/rhel/Microsoft.NETCore.ILAsm.pkgproj

@@ -3,7 +3,7 @@
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
 
   <PropertyGroup>
-    <Version>1.0.2</Version>
+    <Version>1.0.3</Version>
     <SkipPackageFileCheck>true</SkipPackageFileCheck>
     <PackageTargetRuntime>rhel.7-$(PackagePlatform)</PackageTargetRuntime>
     <!-- only build for x64 -->

src/.nuget/Microsoft.NETCore.ILAsm/ubuntu/14.04/Microsoft.NETCore.ILAsm.pkgproj

@@ -3,7 +3,7 @@
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
 
   <PropertyGroup>
-    <Version>1.0.2</Version>
+    <Version>1.0.3</Version>
     <SkipPackageFileCheck>true</SkipPackageFileCheck>
     <PackageTargetRuntime>ubuntu.14.04-$(PackagePlatform)</PackageTargetRuntime>
     <!-- only build for x64 -->

src/.nuget/Microsoft.NETCore.ILAsm/ubuntu/16.04/Microsoft.NETCore.ILAsm.pkgproj

@@ -3,7 +3,7 @@
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
 
   <PropertyGroup>
-    <Version>1.0.2</Version>
+    <Version>1.0.3</Version>
     <SkipPackageFileCheck>true</SkipPackageFileCheck>
     <PackageTargetRuntime>ubuntu.16.04-$(PackagePlatform)</PackageTargetRuntime>
     <!-- only build for x64 -->

src/.nuget/Microsoft.NETCore.ILAsm/win/Microsoft.NETCore.ILAsm.pkgproj

@@ -3,7 +3,7 @@
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
 
   <PropertyGroup>
-    <Version>1.0.2</Version>
+    <Version>1.0.3</Version>
     <SkipPackageFileCheck>true</SkipPackageFileCheck>
     <MinOSForArch>win7</MinOSForArch>
     <MinOSForArch Condition="$(PackagePlatform.StartsWith('arm'))">win8</MinOSForArch>

src/.nuget/Microsoft.NETCore.ILDAsm/Microsoft.NETCore.ILDAsm.pkgproj

@@ -3,7 +3,7 @@
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
 
   <PropertyGroup>
-    <Version>1.0.2</Version>
+    <Version>1.0.3</Version>
     <SkipPackageFileCheck>true</SkipPackageFileCheck>
     <SkipValidatePackage>true</SkipValidatePackage>
     <PackagePlatforms>x64;x86;arm</PackagePlatforms>

src/.nuget/Microsoft.NETCore.ILDAsm/debian/Microsoft.NETCore.ILDAsm.pkgproj

@@ -3,7 +3,7 @@
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
 
   <PropertyGroup>
-    <Version>1.0.2</Version>
+    <Version>1.0.3</Version>
     <SkipPackageFileCheck>true</SkipPackageFileCheck>
     <PackageTargetRuntime>debian.8-$(PackagePlatform)</PackageTargetRuntime>
     <!-- only build for x64 -->

src/.nuget/Microsoft.NETCore.ILDAsm/fedora/23/Microsoft.NETCore.ILDAsm.pkgproj

@@ -3,7 +3,7 @@
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
 
   <PropertyGroup>
-    <Version>1.0.2</Version>
+    <Version>1.0.3</Version>
     <SkipPackageFileCheck>true</SkipPackageFileCheck>
     <PackageTargetRuntime>fedora.23-$(PackagePlatform)</PackageTargetRuntime>
     <!-- only build for x64 -->

src/.nuget/Microsoft.NETCore.ILDAsm/opensuse/13.2/Microsoft.NETCore.ILDAsm.pkgproj

@@ -3,7 +3,7 @@
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
 
   <PropertyGroup>
-    <Version>1.0.2</Version>
+    <Version>1.0.3</Version>
     <SkipPackageFileCheck>true</SkipPackageFileCheck>
     <PackageTargetRuntime>opensuse.13.2-$(PackagePlatform)</PackageTargetRuntime>
     <!-- only build for x64 -->

src/.nuget/Microsoft.NETCore.ILDAsm/osx/Microsoft.NETCore.ILDAsm.pkgproj

@@ -3,7 +3,7 @@
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
 
   <PropertyGroup>
-    <Version>1.0.2</Version>
+    <Version>1.0.3</Version>
     <SkipPackageFileCheck>true</SkipPackageFileCheck>
     <PackageTargetRuntime>osx.10.10-$(PackagePlatform)</PackageTargetRuntime>
     <!-- only build for x64 -->

src/.nuget/Microsoft.NETCore.ILDAsm/rhel/Microsoft.NETCore.ILDAsm.pkgproj

@@ -3,7 +3,7 @@
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
 
   <PropertyGroup>
-    <Version>1.0.2</Version>
+    <Version>1.0.3</Version>
     <SkipPackageFileCheck>true</SkipPackageFileCheck>
     <PackageTargetRuntime>rhel.7-$(PackagePlatform)</PackageTargetRuntime>
     <!-- only build for x64 -->

src/.nuget/Microsoft.NETCore.ILDAsm/ubuntu/14.04/Microsoft.NETCore.ILDAsm.pkgproj

@@ -3,7 +3,7 @@
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
 
   <PropertyGroup>
-    <Version>1.0.2</Version>
+    <Version>1.0.3</Version>
     <SkipPackageFileCheck>true</SkipPackageFileCheck>
     <PackageTargetRuntime>ubuntu.14.04-$(PackagePlatform)</PackageTargetRuntime>
     <!-- only build for x64 -->

src/.nuget/Microsoft.NETCore.ILDAsm/ubuntu/16.04/Microsoft.NETCore.ILDAsm.pkgproj

@@ -3,7 +3,7 @@
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
 
   <PropertyGroup>
-    <Version>1.0.2</Version>
+    <Version>1.0.3</Version>
     <SkipPackageFileCheck>true</SkipPackageFileCheck>
     <PackageTargetRuntime>ubuntu.16.04-$(PackagePlatform)</PackageTargetRuntime>
     <!-- only build for x64 -->

src/.nuget/Microsoft.NETCore.ILDAsm/win/Microsoft.NETCore.ILDAsm.pkgproj

@@ -3,7 +3,7 @@
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
 
   <PropertyGroup>
-    <Version>1.0.2</Version>
+    <Version>1.0.3</Version>
     <SkipPackageFileCheck>true</SkipPackageFileCheck>
     <MinOSForArch>win7</MinOSForArch>
     <MinOSForArch Condition="$(PackagePlatform.StartsWith('arm'))">win8</MinOSForArch>

src/.nuget/Microsoft.NETCore.Jit/Microsoft.NETCore.Jit.pkgproj

@@ -3,7 +3,7 @@
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
 
   <PropertyGroup>
-    <Version>1.0.2</Version>
+    <Version>1.0.3</Version>
     <SkipPackageFileCheck>true</SkipPackageFileCheck>
     <SkipValidatePackage>true</SkipValidatePackage>
     <PackagePlatforms>x64;x86;arm</PackagePlatforms>

src/.nuget/Microsoft.NETCore.Jit/debian/Microsoft.NETCore.Jit.pkgproj

@@ -3,7 +3,7 @@
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
 
   <PropertyGroup>
-    <Version>1.0.2</Version>
+    <Version>1.0.3</Version>
     <SkipPackageFileCheck>true</SkipPackageFileCheck>
     <PackageTargetRuntime>debian.8-$(PackagePlatform)</PackageTargetRuntime>
     <!-- only build for x64 -->

src/.nuget/Microsoft.NETCore.Jit/fedora/23/Microsoft.NETCore.Jit.pkgproj

@@ -3,7 +3,7 @@
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
 
   <PropertyGroup>
-    <Version>1.0.2</Version>
+    <Version>1.0.3</Version>
     <SkipPackageFileCheck>true</SkipPackageFileCheck>
     <PackageTargetRuntime>fedora.23-$(PackagePlatform)</PackageTargetRuntime>
     <!-- only build for x64 -->

src/.nuget/Microsoft.NETCore.Jit/opensuse/13.2/Microsoft.NETCore.Jit.pkgproj

@@ -3,7 +3,7 @@
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
 
   <PropertyGroup>
-    <Version>1.0.2</Version>
+    <Version>1.0.3</Version>
     <SkipPackageFileCheck>true</SkipPackageFileCheck>
     <PackageTargetRuntime>opensuse.13.2-$(PackagePlatform)</PackageTargetRuntime>
     <!-- only build for x64 -->

src/.nuget/Microsoft.NETCore.Jit/osx/Microsoft.NETCore.Jit.pkgproj

@@ -3,7 +3,7 @@
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
 
   <PropertyGroup>
-    <Version>1.0.2</Version>
+    <Version>1.0.3</Version>
     <SkipPackageFileCheck>true</SkipPackageFileCheck>
     <PackageTargetRuntime>osx.10.10-$(PackagePlatform)</PackageTargetRuntime>
     <!-- only build for x64 -->

src/.nuget/Microsoft.NETCore.Jit/rhel/Microsoft.NETCore.Jit.pkgproj

@@ -3,7 +3,7 @@
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
 
   <PropertyGroup>
-    <Version>1.0.2</Version>
+    <Version>1.0.3</Version>
     <SkipPackageFileCheck>true</SkipPackageFileCheck>
     <PackageTargetRuntime>rhel.7-$(PackagePlatform)</PackageTargetRuntime>
     <!-- only build for x64 -->

src/.nuget/Microsoft.NETCore.Jit/ubuntu/14.04/Microsoft.NETCore.Jit.pkgproj

@@ -3,7 +3,7 @@
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
 
   <PropertyGroup>
-    <Version>1.0.2</Version>
+    <Version>1.0.3</Version>
     <SkipPackageFileCheck>true</SkipPackageFileCheck>
     <PackageTargetRuntime>ubuntu.14.04-$(PackagePlatform)</PackageTargetRuntime>
     <!-- only build for x64 -->

src/.nuget/Microsoft.NETCore.Jit/ubuntu/16.04/Microsoft.NETCore.Jit.pkgproj

@@ -3,7 +3,7 @@
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
 
   <PropertyGroup>
-    <Version>1.0.2</Version>
+    <Version>1.0.3</Version>
     <SkipPackageFileCheck>true</SkipPackageFileCheck>
     <PackageTargetRuntime>ubuntu.16.04-$(PackagePlatform)</PackageTargetRuntime>
     <!-- only build for x64 -->

src/.nuget/Microsoft.NETCore.Jit/win/Microsoft.NETCore.Jit.pkgproj

@@ -3,7 +3,7 @@
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
 
   <PropertyGroup>
-    <Version>1.0.2</Version>
+    <Version>1.0.3</Version>
     <SkipPackageFileCheck>true</SkipPackageFileCheck>
     <MinOSForArch>win7</MinOSForArch>
     <MinOSForArch Condition="$(PackagePlatform.StartsWith('arm'))">win8</MinOSForArch>

src/.nuget/Microsoft.NETCore.Runtime.CoreCLR/Microsoft.NETCore.Runtime.CoreCLR.pkgproj

@@ -3,7 +3,7 @@
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
 
   <PropertyGroup>
-    <Version>1.0.2</Version>
+    <Version>1.0.3</Version>
     <SkipPackageFileCheck>true</SkipPackageFileCheck>
     <SkipValidatePackage>true</SkipValidatePackage>
     <PackagePlatforms>x64;x86;arm</PackagePlatforms>

src/.nuget/Microsoft.NETCore.Runtime.CoreCLR/debian/Microsoft.NETCore.Runtime.CoreCLR.pkgproj

@@ -3,7 +3,7 @@
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
 
   <PropertyGroup>
-    <Version>1.0.2</Version>
+    <Version>1.0.3</Version>
     <SkipPackageFileCheck>true</SkipPackageFileCheck>
     <PackageTargetRuntime>debian.8-$(PackagePlatform)</PackageTargetRuntime>
     <!-- only build for x64 -->

src/.nuget/Microsoft.NETCore.Runtime.CoreCLR/fedora/23/Microsoft.NETCore.Runtime.CoreCLR.pkgproj

@@ -3,7 +3,7 @@
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
 
   <PropertyGroup>
-    <Version>1.0.2</Version>
+    <Version>1.0.3</Version>
     <SkipPackageFileCheck>true</SkipPackageFileCheck>
     <PackageTargetRuntime>fedora.23-$(PackagePlatform)</PackageTargetRuntime>
     <!-- only build for x64 -->

src/.nuget/Microsoft.NETCore.Runtime.CoreCLR/opensuse/13.2/Microsoft.NETCore.Runtime.CoreCLR.pkgproj

@@ -3,7 +3,7 @@
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
 
   <PropertyGroup>
-    <Version>1.0.2</Version>
+    <Version>1.0.3</Version>
     <SkipPackageFileCheck>true</SkipPackageFileCheck>
     <PackageTargetRuntime>opensuse.13.2-$(PackagePlatform)</PackageTargetRuntime>
     <!-- only build for x64 -->

src/.nuget/Microsoft.NETCore.Runtime.CoreCLR/osx/Microsoft.NETCore.Runtime.CoreCLR.pkgproj

@@ -3,7 +3,7 @@
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
 
   <PropertyGroup>
-    <Version>1.0.2</Version>
+    <Version>1.0.3</Version>
     <SkipPackageFileCheck>true</SkipPackageFileCheck>
     <PackageTargetRuntime>osx.10.10-$(PackagePlatform)</PackageTargetRuntime>
     <!-- only build for x64 -->

src/.nuget/Microsoft.NETCore.Runtime.CoreCLR/rhel/Microsoft.NETCore.Runtime.CoreCLR.pkgproj

@@ -3,7 +3,7 @@
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
 
   <PropertyGroup>
-    <Version>1.0.2</Version>
+    <Version>1.0.3</Version>
     <SkipPackageFileCheck>true</SkipPackageFileCheck>
     <PackageTargetRuntime>rhel.7-$(PackagePlatform)</PackageTargetRuntime>
     <!-- only build for x64 -->

src/.nuget/Microsoft.NETCore.Runtime.CoreCLR/ubuntu/14.04/Microsoft.NETCore.Runtime.CoreCLR.pkgproj

@@ -3,7 +3,7 @@
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
 
   <PropertyGroup>
-    <Version>1.0.2</Version>
+    <Version>1.0.3</Version>
     <SkipPackageFileCheck>true</SkipPackageFileCheck>
     <PackageTargetRuntime>ubuntu.14.04-$(PackagePlatform)</PackageTargetRuntime>
     <!-- only build for x64 -->

src/.nuget/Microsoft.NETCore.Runtime.CoreCLR/ubuntu/16.04/Microsoft.NETCore.Runtime.CoreCLR.pkgproj

@@ -3,7 +3,7 @@
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
 
   <PropertyGroup>
-    <Version>1.0.2</Version>
+    <Version>1.0.3</Version>
     <SkipPackageFileCheck>true</SkipPackageFileCheck>
     <PackageTargetRuntime>ubuntu.16.04-$(PackagePlatform)</PackageTargetRuntime>
     <!-- only build for x64 -->

src/.nuget/Microsoft.NETCore.Runtime.CoreCLR/win/Microsoft.NETCore.Runtime.CoreCLR.pkgproj

@@ -3,7 +3,7 @@
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
 
   <PropertyGroup>
-    <Version>1.0.2</Version>
+    <Version>1.0.3</Version>
     <SkipPackageFileCheck>true</SkipPackageFileCheck>
     <MinOSForArch>win7</MinOSForArch>
     <MinOSForArch Condition="$(PackagePlatform.StartsWith('arm'))">win8</MinOSForArch>

src/jit/ee_il_dll.cpp

@@ -23,6 +23,7 @@ XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
 #if !defined(PLATFORM_UNIX)
 #include <io.h>    // For _dup, _setmode
 #include <fcntl.h> // For _O_TEXT
+#include <errno.h> // For EINVAL
 #endif
 
 /*****************************************************************************/
@@ -72,10 +73,33 @@ void __stdcall jitStartup(ICorJitHost* jitHost)
 #else
     if (jitstdout == nullptr)
     {
-        int jitstdoutFd = _dup(_fileno(procstdout()));
-        _setmode(jitstdoutFd, _O_TEXT);
-        jitstdout = _fdopen(jitstdoutFd, "w");
-        assert(jitstdout != nullptr);
+        int stdoutFd = _fileno(procstdout());
+        // Check fileno error output(s) -1 may overlap with errno result
+        // but is included for completness.
+        // We want to detect the case where the initial handle is null
+        // or bogus and avoid making further calls.
+        if ((stdoutFd != -1) && (stdoutFd != -2) && (errno != EINVAL))
+        {
+            int jitstdoutFd = _dup(_fileno(procstdout()));
+            // Check the error status returned by dup.
+            if (jitstdoutFd != -1)
+            {
+                _setmode(jitstdoutFd, _O_TEXT);
+                jitstdout = _fdopen(jitstdoutFd, "w");
+                assert(jitstdout != nullptr);
+
+                // Prevent the FILE* from buffering its output in order to avoid calls to
+                // `fflush()` throughout the code.
+                setvbuf(jitstdout, nullptr, _IONBF, 0);
+            }
+        }
+    }
+
+    // If jitstdout is still null, fallback to whatever procstdout() was
+    // initially set to.
+    if (jitstdout == nullptr)
+    {
+        jitstdout = procstdout();
     }
 #endif
 

src/pal/src/exception/signal.cpp

@@ -464,10 +464,10 @@ static void inject_activation_handler(int code, siginfo_t *siginfo, void *contex
         if (g_safeActivationCheckFunction(CONTEXTGetPC(&winContext), /* checkingCurrentThread */ TRUE))
         {
             g_activationFunction(&winContext);
-        }
 
-        // Activation function may have modified the context, so update it.
-        CONTEXTToNativeContext(&winContext, ucontext);
+            // Activation function may have modified the context, so update it.
+            CONTEXTToNativeContext(&winContext, ucontext);
+        }
     }
     else if (g_previous_activation.sa_sigaction != NULL)
     {