Add Ultra.ProcessHook

Author: xoofx

src/Ultra.Core/Ultra.Core.csproj

@@ -38,5 +38,6 @@
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
+    <ProjectReference Include="..\Ultra.ProcessHook\Ultra.ProcessHook.csproj" />
   </ItemGroup>
 </Project>

src/Ultra.ProcessHook/StartupHook.cs

@@ -0,0 +1,27 @@
+// Copyright (c) Alexandre Mutel. All rights reserved.
+// Licensed under the BSD-Clause 2 license.
+// See license.txt file in the project root for full license information.
+using System;
+using System.Runtime.InteropServices;
+
+/// <summary>
+/// This class is used to load the native library <c>libUltraSamplerIndirect.dylib</c> on macOS ARM64
+/// and allows to attach to an existing process by PID and profile it with ultra.
+/// The native library is responsible for loading the native Ultra.Sampler.UltraSampler to profile the target process.
+/// </summary>
+// ReSharper disable once CheckNamespace
+internal static class StartupHook
+{
+    private const string NativeLibraryName = "libUltraSamplerIndirect.dyld";
+    private static nint _libraryHandle;
+
+    public static void Initialize()
+    {
+        // We don't need to re-load the library once it is loaded.
+        // Only load the library on macOS ARM64
+        if (_libraryHandle == 0 && OperatingSystem.IsMacOS() && RuntimeInformation.ProcessArchitecture == Architecture.Arm64)
+        {
+            NativeLibrary.TryLoad(Path.Combine(AppContext.BaseDirectory, NativeLibraryName), out _libraryHandle);
+        }
+    }
+}

src/Ultra.ProcessHook/Ultra.ProcessHook.csproj

@@ -0,0 +1,8 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+</Project>

src/Ultra.Sampler/UltraSampler.cs

@@ -4,7 +4,7 @@
 
 namespace Ultra.Sampler;
 
-public abstract class UltraSampler
+internal abstract class UltraSampler
 {
     private static readonly object Lock = new();
 

src/ultra.sln

@@ -32,6 +32,8 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Documentation", "Documentat
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Ultra.Sampler", "Ultra.Sampler\Ultra.Sampler.csproj", "{F06B2925-6916-4CA1-BFBB-ADAFA59BE835}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Ultra.ProcessHook", "Ultra.ProcessHook\Ultra.ProcessHook.csproj", "{250C55EA-E6A7-4743-AD04-B07B412832CA}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -58,6 +60,10 @@ Global
 		{F06B2925-6916-4CA1-BFBB-ADAFA59BE835}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{F06B2925-6916-4CA1-BFBB-ADAFA59BE835}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{F06B2925-6916-4CA1-BFBB-ADAFA59BE835}.Release|Any CPU.Build.0 = Release|Any CPU
+		{250C55EA-E6A7-4743-AD04-B07B412832CA}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{250C55EA-E6A7-4743-AD04-B07B412832CA}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{250C55EA-E6A7-4743-AD04-B07B412832CA}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{250C55EA-E6A7-4743-AD04-B07B412832CA}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE