Add native errno to ErrorCategory mapper

src/System.Management.Automation/CoreCLR/CorePsPlatform.cs

@@ -461,6 +461,12 @@ namespace System.Management.Automation
         // to a PAL value and calls strerror_r underneath to generate the message.
         internal static class Unix
         {
+            // This is a helper that attempts to map errno into a PowerShell ErrorCategory
+            internal static ErrorCategory GetErrorCategory(int errno)
+            {
+                return (ErrorCategory)Unix.NativeMethods.GetErrorCategory(errno);
+            }
+
             private static string s_userName;
             public static string UserName
             {
@@ -574,6 +580,9 @@ namespace System.Management.Automation
 
                 // C bools are 1 byte and so must be marshaled as I1
 
+                [DllImport(psLib, CharSet = CharSet.Ansi)]
+                internal static extern int GetErrorCategory(int errno);
+
                 [DllImport(psLib, CharSet = CharSet.Ansi, SetLastError = true)]
                 [return: MarshalAs(UnmanagedType.LPStr)]
                 internal static extern string GetUserName();

src/System.Management.Automation/namespaces/FileSystemProvider.cs

@@ -2236,7 +2236,11 @@ namespace Microsoft.PowerShell.Commands
 
                         Win32Exception w32Exception = new Win32Exception((int)errorCode);
 
+#if UNIX
+                        if (Platform.Unix.GetErrorCategory(errorCode) == ErrorCategory.PermissionDenied)
+#else
                         if (errorCode == 1314) //ERROR_PRIVILEGE_NOT_HELD
+#endif
                         {
                             string message = FileSystemProviderStrings.ElevationRequired;
                             WriteError(new ErrorRecord(new UnauthorizedAccessException(message, w32Exception), "NewItemSymbolicLinkElevationRequired", ErrorCategory.PermissionDenied, value.ToString()));

src/libpsl-native/src/CMakeLists.txt

@@ -9,6 +9,7 @@ add_library(psl-native SHARED
   getcomputername.cpp
   getlinkcount.cpp
   getfullyqualifiedname.cpp
+  geterrorcategory.cpp
   isfile.cpp
   isdirectory.cpp
   issymlink.cpp

src/libpsl-native/src/geterrorcategory.cpp

@@ -0,0 +1,63 @@
+#include "geterrorcategory.h"
+
+#include <assert.h>
+#include <sys/types.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+// Copy of PowerShell ErrorCategory enum from ErrorPackage.cs
+enum ErrorCategory {
+        NotSpecified = 0,
+        OpenError = 1,
+        CloseError = 2,
+        DeviceError = 3,
+        DeadlockDetected = 4,
+        InvalidArgument = 5,
+        InvalidData = 6,
+        InvalidOperation = 7,
+        InvalidResult = 8,
+        InvalidType = 9,
+        MetadataError = 10,
+        NotImplemented = 11,
+        NotInstalled = 12,
+        ObjectNotFound = 13,
+        OperationStopped = 14,
+        OperationTimeout = 15,
+        SyntaxError = 16,
+        ParserError = 17,
+        PermissionDenied = 18,
+        ResourceBusy = 19,
+        ResourceExists = 20,
+        ResourceUnavailable = 21,
+        ReadError = 22,
+        WriteError = 23,
+        FromStdErr = 24,
+        SecurityError = 25,
+        ProtocolError = 26,
+        ConnectionError = 27,
+        AuthenticationError = 28,
+        LimitsExceeded = 29,
+        QuotaExceeded = 30,
+        NotEnabled = 31,
+};
+
+//! @brief Maps Linux errno to PowerShell ErrorCategory
+int32_t GetErrorCategory(int32_t errnum)
+{
+    switch (errnum)
+    {
+    case EINVAL:
+        return InvalidArgument;
+    case ENOENT:
+    case ESRCH:
+        return ObjectNotFound;
+    case EINTR:
+        return OperationStopped;
+    case EACCES:
+    case EPERM:
+        return PermissionDenied;
+    default:
+        return NotSpecified;
+    }
+}

src/libpsl-native/src/geterrorcategory.h

@@ -0,0 +1,9 @@
+#pragma once
+
+#include "pal.h"
+
+PAL_BEGIN_EXTERNC
+
+int32_t GetErrorCategory(int32_t);
+
+PAL_END_EXTERNC