[iOS] Follow up changes for 61590 (#61670)

src/libraries/System.Diagnostics.Process/ref/System.Diagnostics.Process.cs

@@ -84,7 +84,11 @@ public Process() { }
         public System.DateTime StartTime { get { throw null; } }
         public System.ComponentModel.ISynchronizeInvoke? SynchronizingObject { get { throw null; } set { } }
         public System.Diagnostics.ProcessThreadCollection Threads { get { throw null; } }
+        [System.Runtime.Versioning.UnsupportedOSPlatformAttribute("ios")]
+        [System.Runtime.Versioning.UnsupportedOSPlatformAttribute("tvos")]
         public System.TimeSpan TotalProcessorTime { get { throw null; } }
+        [System.Runtime.Versioning.UnsupportedOSPlatformAttribute("ios")]
+        [System.Runtime.Versioning.UnsupportedOSPlatformAttribute("tvos")]
         public System.TimeSpan UserProcessorTime { get { throw null; } }
         [System.ObsoleteAttribute("Process.VirtualMemorySize has been deprecated because the type of the property can't represent all valid results. Use System.Diagnostics.Process.VirtualMemorySize64 instead.")]
         public int VirtualMemorySize { get { throw null; } }
@@ -106,9 +110,17 @@ public static void EnterDebugMode() { }
         public static System.Diagnostics.Process GetCurrentProcess() { throw null; }
         public static System.Diagnostics.Process GetProcessById(int processId) { throw null; }
         public static System.Diagnostics.Process GetProcessById(int processId, string machineName) { throw null; }
+        [System.Runtime.Versioning.UnsupportedOSPlatformAttribute("ios")]
+        [System.Runtime.Versioning.UnsupportedOSPlatformAttribute("tvos")]
         public static System.Diagnostics.Process[] GetProcesses() { throw null; }
+        [System.Runtime.Versioning.UnsupportedOSPlatformAttribute("ios")]
+        [System.Runtime.Versioning.UnsupportedOSPlatformAttribute("tvos")]
         public static System.Diagnostics.Process[] GetProcesses(string machineName) { throw null; }
+        [System.Runtime.Versioning.UnsupportedOSPlatformAttribute("ios")]
+        [System.Runtime.Versioning.UnsupportedOSPlatformAttribute("tvos")]
         public static System.Diagnostics.Process[] GetProcessesByName(string? processName) { throw null; }
+        [System.Runtime.Versioning.UnsupportedOSPlatformAttribute("ios")]
+        [System.Runtime.Versioning.UnsupportedOSPlatformAttribute("tvos")]
         public static System.Diagnostics.Process[] GetProcessesByName(string? processName, string machineName) { throw null; }
         [System.Runtime.Versioning.UnsupportedOSPlatformAttribute("ios")]
         [System.Runtime.Versioning.UnsupportedOSPlatformAttribute("tvos")]
@@ -233,6 +245,8 @@ internal ProcessThread() { }
         public int IdealProcessor { set { } }
         public bool PriorityBoostEnabled { get { throw null; } set { } }
         public System.Diagnostics.ThreadPriorityLevel PriorityLevel { [System.Runtime.Versioning.SupportedOSPlatform("windows")] [System.Runtime.Versioning.SupportedOSPlatform("linux")] [System.Runtime.Versioning.SupportedOSPlatform("freebsd")] get { throw null; } [System.Runtime.Versioning.SupportedOSPlatformAttribute("windows")] set { } }
+        [System.Runtime.Versioning.UnsupportedOSPlatformAttribute("ios")]
+        [System.Runtime.Versioning.UnsupportedOSPlatformAttribute("tvos")]
         public System.TimeSpan PrivilegedProcessorTime { get { throw null; } }
         [System.Runtime.Versioning.SupportedOSPlatformAttribute("windows")]
         public System.IntPtr ProcessorAffinity { set { } }
@@ -241,7 +255,11 @@ public System.IntPtr ProcessorAffinity { set { } }
         [System.Runtime.Versioning.SupportedOSPlatform("linux")]
         public System.DateTime StartTime { get { throw null; } }
         public System.Diagnostics.ThreadState ThreadState { get { throw null; } }
+        [System.Runtime.Versioning.UnsupportedOSPlatformAttribute("ios")]
+        [System.Runtime.Versioning.UnsupportedOSPlatformAttribute("tvos")]
         public System.TimeSpan TotalProcessorTime { get { throw null; } }
+        [System.Runtime.Versioning.UnsupportedOSPlatformAttribute("ios")]
+        [System.Runtime.Versioning.UnsupportedOSPlatformAttribute("tvos")]
         public System.TimeSpan UserProcessorTime { get { throw null; } }
         public System.Diagnostics.ThreadWaitReason WaitReason { get { throw null; } }
         public void ResetIdealProcessor() { }

src/libraries/System.Diagnostics.Process/src/System.Diagnostics.Process.csproj

@@ -329,7 +329,7 @@
     <Compile Include="System\Diagnostics\ProcessManager.Win32.cs" />
     <Compile Include="System\Diagnostics\ProcessStartInfo.Win32.cs" />
   </ItemGroup>
-  <ItemGroup Condition="'$(TargetsAnyOS)' != 'true'">
+  <ItemGroup Condition="'$(TargetsAnyOS)' != 'true' and '$(TargetsiOS)' != 'true' and '$(TargetstvOS)' != 'true'">
     <Compile Include="System\Diagnostics\Process.NonUap.cs" />
   </ItemGroup>
   <ItemGroup Condition=" '$(TargetsFreeBSD)' == 'true'">
@@ -350,6 +350,9 @@
     <Compile Include="System\Diagnostics\ProcessManager.UnknownUnix.cs" />
     <Compile Include="System\Diagnostics\ProcessThread.UnknownUnix.cs" />
   </ItemGroup>
+  <ItemGroup Condition="'$(TargetsiOS)' == 'true' or '$(TargetstvOS)' == 'true'">
+    <Compile Include="System\Diagnostics\Process.iOS.cs" />
+  </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="$(LibrariesProjectRoot)Microsoft.Win32.Registry\src\Microsoft.Win32.Registry.csproj" />
     <Reference Include="Microsoft.Win32.Primitives" />

src/libraries/System.Diagnostics.Process/src/System/Diagnostics/Process.BSD.cs

@@ -3,6 +3,7 @@
 
 using System.Collections.Generic;
 using System.ComponentModel;
+using System.Runtime.Versioning;
 
 namespace System.Diagnostics
 {
@@ -12,6 +13,8 @@ public partial class Process
         /// Creates an array of <see cref="Process"/> components that are associated with process resources on a
         /// remote computer. These process resources share the specified process name.
         /// </summary>
+        [UnsupportedOSPlatform("ios")]
+        [UnsupportedOSPlatform("tvos")]
         public static Process[] GetProcessesByName(string? processName, string machineName)
         {
             if (processName == null)

src/libraries/System.Diagnostics.Process/src/System/Diagnostics/Process.Linux.cs

@@ -7,6 +7,7 @@
 using System.ComponentModel;
 using System.Globalization;
 using System.IO;
+using System.Runtime.Versioning;
 using System.Text;
 
 namespace System.Diagnostics
@@ -17,6 +18,8 @@ public partial class Process : IDisposable
         /// Creates an array of <see cref="Process"/> components that are associated with process resources on a
         /// remote computer. These process resources share the specified process name.
         /// </summary>
+        [UnsupportedOSPlatform("ios")]
+        [UnsupportedOSPlatform("tvos")]
         public static Process[] GetProcessesByName(string? processName, string machineName)
         {
             ProcessManager.ThrowIfRemoteMachine(machineName);

src/libraries/System.Diagnostics.Process/src/System/Diagnostics/Process.UnknownUnix.cs

@@ -1,6 +1,8 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
+using System.Runtime.Versioning;
+
 namespace System.Diagnostics
 {
     public partial class Process : IDisposable
@@ -9,12 +11,16 @@ public partial class Process : IDisposable
         /// Creates an array of <see cref="Process"/> components that are associated with process resources on a
         /// remote computer. These process resources share the specified process name.
         /// </summary>
+        [UnsupportedOSPlatform("ios")]
+        [UnsupportedOSPlatform("tvos")]
         public static Process[] GetProcessesByName(string? processName, string machineName)
         {
             throw new PlatformNotSupportedException();
         }
 
         /// <summary>Gets the amount of time the process has spent running code inside the operating system core.</summary>
+        [UnsupportedOSPlatform("ios")]
+        [UnsupportedOSPlatform("tvos")]
         public TimeSpan PrivilegedProcessorTime
         {
             get { throw new PlatformNotSupportedException(); }
@@ -31,6 +37,8 @@ internal DateTime StartTimeCore
         /// It is the sum of the <see cref='System.Diagnostics.Process.UserProcessorTime'/> and
         /// <see cref='System.Diagnostics.Process.PrivilegedProcessorTime'/>.
         /// </summary>
+        [UnsupportedOSPlatform("ios")]
+        [UnsupportedOSPlatform("tvos")]
         public TimeSpan TotalProcessorTime
         {
             get { throw new PlatformNotSupportedException(); }
@@ -40,6 +48,8 @@ public TimeSpan TotalProcessorTime
         /// Gets the amount of time the associated process has spent running code
         /// inside the application portion of the process (not the operating system core).
         /// </summary>
+        [UnsupportedOSPlatform("ios")]
+        [UnsupportedOSPlatform("tvos")]
         public TimeSpan UserProcessorTime
         {
             get { throw new PlatformNotSupportedException(); }

src/libraries/System.Diagnostics.Process/src/System/Diagnostics/Process.Windows.cs

@@ -21,6 +21,8 @@ public partial class Process : IDisposable
         /// Creates an array of <see cref="Process"/> components that are associated with process resources on a
         /// remote computer. These process resources share the specified process name.
         /// </summary>
+        [UnsupportedOSPlatform("ios")]
+        [UnsupportedOSPlatform("tvos")]
         public static Process[] GetProcessesByName(string? processName, string machineName)
         {
             if (processName == null)

src/libraries/System.Diagnostics.Process/src/System/Diagnostics/Process.cs

@@ -1039,6 +1039,8 @@ public static Process GetProcessById(int processId)
         ///       local computer. These process resources share the specified process name.
         ///    </para>
         /// </devdoc>
+        [UnsupportedOSPlatform("ios")]
+        [UnsupportedOSPlatform("tvos")]
         public static Process[] GetProcessesByName(string? processName)
         {
             return GetProcessesByName(processName, ".");
@@ -1050,6 +1052,8 @@ public static Process[] GetProcessesByName(string? processName)
         ///       component for each process resource on the local computer.
         ///    </para>
         /// </devdoc>
+        [UnsupportedOSPlatform("ios")]
+        [UnsupportedOSPlatform("tvos")]
         public static Process[] GetProcesses()
         {
             return GetProcesses(".");
@@ -1062,6 +1066,8 @@ public static Process[] GetProcesses()
         ///       process resource on the specified computer.
         ///    </para>
         /// </devdoc>
+        [UnsupportedOSPlatform("ios")]
+        [UnsupportedOSPlatform("tvos")]
         public static Process[] GetProcesses(string machineName)
         {
             bool isRemoteMachine = ProcessManager.IsRemoteMachine(machineName);

src/libraries/System.Diagnostics.Process/src/System/Diagnostics/Process.iOS.cs

@@ -0,0 +1,33 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Runtime.Versioning;
+
+namespace System.Diagnostics
+{
+    public partial class Process : IDisposable
+    {
+        [UnsupportedOSPlatform("ios")]
+        [UnsupportedOSPlatform("tvos")]
+        public void Kill(bool entireProcessTree)
+        {
+            throw new PlatformNotSupportedException();
+        }
+
+        /// <summary>
+        /// Returns all immediate child processes.
+        /// </summary>
+        private IReadOnlyList<Process> GetChildProcesses(Process[]? processes = null)
+        {
+            throw new PlatformNotSupportedException();
+        }
+
+        private static bool IsProcessInvalidException(Exception e) =>
+            // InvalidOperationException signifies conditions such as the process already being dead.
+            // Win32Exception signifies issues such as insufficient permissions to get details on the process.
+            // In either case, the predicate couldn't be applied so return the fallback result.
+            e is InvalidOperationException || e is Win32Exception;
+    }
+}

src/libraries/System.Diagnostics.Process/src/System/Diagnostics/ProcessManager.Unix.cs

@@ -3,6 +3,7 @@
 
 using Microsoft.Win32.SafeHandles;
 using System.Collections.Generic;
+using System.Runtime.Versioning;
 using System.Text;
 
 namespace System.Diagnostics
@@ -44,6 +45,8 @@ public static bool IsProcessRunning(int processId)
         /// <summary>Gets the IDs of all processes on the specified machine.</summary>
         /// <param name="machineName">The machine to examine.</param>
         /// <returns>An array of process IDs from the specified machine.</returns>
+        [UnsupportedOSPlatform("ios")]
+        [UnsupportedOSPlatform("tvos")]
         public static int[] GetProcessIds(string machineName)
         {
             ThrowIfRemoteMachine(machineName);

src/libraries/System.Diagnostics.Process/src/System/Diagnostics/ProcessManager.UnknownUnix.cs

@@ -1,6 +1,8 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
+using System.Runtime.Versioning;
+
 namespace System.Diagnostics
 {
     internal static partial class ProcessManager
@@ -14,6 +16,8 @@ public static int[] GetProcessIds()
         /// <summary>Gets process infos for each process on the specified machine.</summary>
         /// <param name="machineName">The target machine.</param>
         /// <returns>An array of process infos, one per found process.</returns>
+        [UnsupportedOSPlatform("ios")]
+        [UnsupportedOSPlatform("tvos")]
         public static ProcessInfo[] GetProcessInfos(string machineName)
         {
             throw new PlatformNotSupportedException();

src/libraries/System.Diagnostics.Process/src/System/Diagnostics/ProcessThread.UnknownUnix.cs

@@ -1,6 +1,8 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
+using System.Runtime.Versioning;
+
 namespace System.Diagnostics
 {
     public partial class ProcessThread
@@ -20,6 +22,8 @@ private ThreadPriorityLevel PriorityLevelCore
         /// Returns the amount of time the thread has spent running code inside the operating
         /// system core.
         /// </summary>
+        [UnsupportedOSPlatform("ios")]
+        [UnsupportedOSPlatform("tvos")]
         public TimeSpan PrivilegedProcessorTime
         {
             get { throw new PlatformNotSupportedException(); }  // Not available on POSIX
@@ -32,6 +36,8 @@ public TimeSpan PrivilegedProcessorTime
         /// It is the sum of the System.Diagnostics.ProcessThread.UserProcessorTime and
         /// System.Diagnostics.ProcessThread.PrivilegedProcessorTime.
         /// </summary>
+        [UnsupportedOSPlatform("ios")]
+        [UnsupportedOSPlatform("tvos")]
         public TimeSpan TotalProcessorTime
         {
             get { throw new PlatformNotSupportedException(); }  // Not available on POSIX
@@ -41,6 +47,8 @@ public TimeSpan TotalProcessorTime
         /// Returns the amount of time the associated thread has spent running code
         /// inside the application (not the operating system core).
         /// </summary>
+        [UnsupportedOSPlatform("ios")]
+        [UnsupportedOSPlatform("tvos")]
         public TimeSpan UserProcessorTime
         {
             get { throw new PlatformNotSupportedException(); }  // Not available on POSIX

src/libraries/System.Diagnostics.Process/src/System/Diagnostics/ThreadInfo.cs

@@ -12,12 +12,14 @@ namespace System.Diagnostics
     /// <internalonly/>
     internal sealed class ThreadInfo
     {
+#pragma warning disable CS0649 // The fields are unused on iOS/tvOS as the respective managed logic (mostly around libproc) is excluded.
         internal ulong _threadId;
         internal int _processId;
         internal int _basePriority;
         internal int _currentPriority;
         internal IntPtr _startAddress;
         internal ThreadState _threadState;
         internal ThreadWaitReason _threadWaitReason;
+#pragma warning restore CS0649
     }
 }

src/libraries/System.Diagnostics.Process/tests/ProcessModuleTests.cs

@@ -10,6 +10,7 @@ namespace System.Diagnostics.Tests
     public partial class ProcessModuleTests : ProcessTestBase
     {
         [Fact]
+        [SkipOnPlatform(TestPlatforms.iOS | TestPlatforms.tvOS, "libproc is not supported on iOS/tvOS")]
         public void TestModuleProperties()
         {
             ProcessModuleCollection modules = Process.GetCurrentProcess().Modules;
@@ -29,6 +30,7 @@ public void TestModuleProperties()
         }
 
         [Fact]
+        [SkipOnPlatform(TestPlatforms.iOS | TestPlatforms.tvOS, "libproc is not supported on iOS/tvOS")]
         public void Modules_Get_ContainsHostFileName()
         {
             ProcessModuleCollection modules = Process.GetCurrentProcess().Modules;