PlatformNotSupportedException for UNIX domain sockets on iOS/tvOS (#7…

…3374) * PNSE for domain sockets on iOS/tvOS * Re-enable some tests which SHOULD now throw PNSE
dotnet · Aug 9, 2022 · 9687016 · 9687016
1 parent 6110ab6
commit 9687016
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Showing 26 changed files with 167 additions and 168 deletions.
diff --git a/src/libraries/Common/src/System/Net/SocketProtocolSupportPal.Unix.cs b/src/libraries/Common/src/System/Net/SocketProtocolSupportPal.Unix.cs
@@ -11,6 +11,12 @@ internal static partial class SocketProtocolSupportPal
     {
         private static unsafe bool IsSupported(AddressFamily af)
         {
+            // Check for AF_UNIX on iOS/tvOS. The OS claims to support this, but returns EPERM on bind.
+            // We should explicitly set the return here to false, to avoid giving a false impression.
+            if (af == AddressFamily.Unix && (OperatingSystem.IsTvOS() || (OperatingSystem.IsIOS() && !OperatingSystem.IsMacCatalyst())))
+            {
+                return false;
+            }
             IntPtr invalid = (IntPtr)(-1);
             IntPtr socket = invalid;
             try

diff --git a/src/libraries/Common/tests/StreamConformanceTests/System/IO/StreamConformanceTests.cs b/src/libraries/Common/tests/StreamConformanceTests/System/IO/StreamConformanceTests.cs
diff --git a/src/libraries/System.IO.FileSystem/tests/Base/FileGetSetAttributes.cs b/src/libraries/System.IO.FileSystem/tests/Base/FileGetSetAttributes.cs
@@ -27,7 +27,7 @@ public void SettingAttributes_Unix_ReadOnly()
 
         [Theory]
         [InlineData(FileAttributes.Hidden)]
-        [PlatformSpecific(TestPlatforms.OSX | TestPlatforms.FreeBSD)]
+        [PlatformSpecific(TestPlatforms.OSX | TestPlatforms.FreeBSD | TestPlatforms.iOS | TestPlatforms.tvOS | TestPlatforms.MacCatalyst)]
         public void SettingAttributes_OSXAndFreeBSD(FileAttributes attributes)
         {
             string path = CreateItem();
@@ -80,8 +80,7 @@ public void SettingInvalidAttributes_Unix(FileAttributes attributes)
 
         [ConditionalTheory(typeof(PlatformDetection), nameof(PlatformDetection.FileCreateCaseSensitive))]
         [InlineData(FileAttributes.Hidden)]
-        [PlatformSpecific(TestPlatforms.AnyUnix & ~(TestPlatforms.OSX | TestPlatforms.FreeBSD))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/67853", TestPlatforms.tvOS)]
+        [PlatformSpecific(TestPlatforms.AnyUnix & ~(TestPlatforms.OSX | TestPlatforms.FreeBSD | TestPlatforms.iOS | TestPlatforms.tvOS | TestPlatforms.MacCatalyst))]
         public void SettingInvalidAttributes_UnixExceptOSXAndFreeBSD(FileAttributes attributes)
         {
             string path = CreateItem();

diff --git a/src/libraries/System.IO.FileSystem/tests/Directory/CreateDirectory.cs b/src/libraries/System.IO.FileSystem/tests/Directory/CreateDirectory.cs
@@ -468,7 +468,7 @@ public void DriveLetter_Windows()
 
         [Fact]
         [PlatformSpecific(TestPlatforms.AnyUnix)]  // drive letters casing
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/67853", TestPlatforms.tvOS)]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/67853", TestPlatforms.iOS | TestPlatforms.tvOS)]
         public void DriveLetter_Unix()
         {
             // On Unix, there's no special casing for drive letters.  These may or may not be valid names, depending

diff --git a/src/libraries/System.IO.FileSystem/tests/Directory/Delete.cs b/src/libraries/System.IO.FileSystem/tests/Directory/Delete.cs
@@ -122,7 +122,7 @@ public void DeletingSymLinkDoesntDeleteTarget()
         }
 
         [ConditionalFact(nameof(UsingNewNormalization))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/67853", TestPlatforms.tvOS)]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/67853", TestPlatforms.iOS | TestPlatforms.tvOS)]
         public void ExtendedDirectoryWithSubdirectories()
         {
             DirectoryInfo testDir = Directory.CreateDirectory(IOInputs.ExtendedPrefix + GetTestFilePath());
@@ -132,7 +132,7 @@ public void ExtendedDirectoryWithSubdirectories()
         }
 
         [ConditionalFact(nameof(LongPathsAreNotBlocked), nameof(UsingNewNormalization))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/67853", TestPlatforms.tvOS)]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/67853", TestPlatforms.iOS | TestPlatforms.tvOS)]
         public void LongPathExtendedDirectory()
         {
             DirectoryInfo testDir = Directory.CreateDirectory(IOServices.GetPath(IOInputs.ExtendedPrefix + TestDirectory, characterCount: 500));

diff --git a/src/libraries/System.IO.FileSystem/tests/Directory/Exists.cs b/src/libraries/System.IO.FileSystem/tests/Directory/Exists.cs
@@ -394,7 +394,7 @@ public void ExtendedPathAlreadyExistsAsFile()
 
         [Fact]
         [PlatformSpecific(TestPlatforms.AnyUnix & ~TestPlatforms.Browser)]  // Makes call to native code (libc)
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/67853", TestPlatforms.tvOS)]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/67853", TestPlatforms.iOS | TestPlatforms.tvOS)]
         public void FalseForNonRegularFile()
         {
             string fileName = GetTestFilePath();

diff --git a/src/libraries/System.IO.FileSystem/tests/Directory/GetFileSystemEntries_str_str.cs b/src/libraries/System.IO.FileSystem/tests/Directory/GetFileSystemEntries_str_str.cs
@@ -698,7 +698,6 @@ public void WindowsSearchPatternWhitespace()
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.FileCreateCaseSensitive))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/67853", TestPlatforms.tvOS)]
         public void SearchPatternCaseSensitive()
         {
             DirectoryInfo testDir = Directory.CreateDirectory(GetTestFilePath());

diff --git a/src/libraries/System.IO.FileSystem/tests/Directory/GetLogicalDrives.cs b/src/libraries/System.IO.FileSystem/tests/Directory/GetLogicalDrives.cs
@@ -11,7 +11,6 @@ public class Directory_GetLogicalDrives
     {
         [Fact]
         [PlatformSpecific(TestPlatforms.AnyUnix)]  // Valid drive strings on Unix
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/67853", TestPlatforms.tvOS)]
         public void GetsValidDriveStrings_Unix()
         {
             string[] drives = Directory.GetLogicalDrives();

diff --git a/src/libraries/System.IO.FileSystem/tests/DirectoryInfo/Exists.cs b/src/libraries/System.IO.FileSystem/tests/DirectoryInfo/Exists.cs
@@ -109,7 +109,7 @@ public void FalseForFile()
 
         [Fact]
         [PlatformSpecific(TestPlatforms.AnyUnix & ~TestPlatforms.Browser)]  // Uses P/Invokes
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/67853", TestPlatforms.tvOS)]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/67853", TestPlatforms.iOS | TestPlatforms.tvOS)]
         public void FalseForNonRegularFile()
         {
             string fileName = GetTestFilePath();

diff --git a/src/libraries/System.IO.FileSystem/tests/File/Exists.cs b/src/libraries/System.IO.FileSystem/tests/File/Exists.cs
@@ -255,7 +255,7 @@ public void PathAlreadyExistsAsDirectory()
 
         [Fact]
         [PlatformSpecific(TestPlatforms.AnyUnix & ~TestPlatforms.Browser)]  // Uses P/Invokes
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/67853", TestPlatforms.tvOS)]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/67853", TestPlatforms.iOS | TestPlatforms.tvOS)]
         public void FalseForNonRegularFile()
         {
             string fileName = GetTestFilePath();

diff --git a/src/libraries/System.IO.FileSystem/tests/File/ReadWriteAllBytes.cs b/src/libraries/System.IO.FileSystem/tests/File/ReadWriteAllBytes.cs
@@ -194,7 +194,7 @@ static async Task WaitConnectionAndWritePipeStreamAsync(NamedPipeServerStream na
 
         [Fact]
         [PlatformSpecific(TestPlatforms.AnyUnix & ~TestPlatforms.Browser)]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/67853", TestPlatforms.tvOS)]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/67853", TestPlatforms.iOS | TestPlatforms.tvOS)]
         public async Task ReadAllBytes_NonSeekableFileStream_InUnix()
         {
             string fifoPath = GetTestFilePath();

diff --git a/src/libraries/System.IO.FileSystem/tests/File/ReadWriteAllBytesAsync.cs b/src/libraries/System.IO.FileSystem/tests/File/ReadWriteAllBytesAsync.cs
@@ -204,7 +204,7 @@ static async Task WaitConnectionAndWritePipeStreamAsync(NamedPipeServerStream na
 
         [Fact]
         [PlatformSpecific(TestPlatforms.AnyUnix & ~TestPlatforms.Browser)]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/67853", TestPlatforms.tvOS)]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/67853", TestPlatforms.iOS | TestPlatforms.tvOS)]
         public async Task ReadAllBytesAsync_NonSeekableFileStream_InUnix()
         {
             string fifoPath = GetTestFilePath();

diff --git a/src/libraries/System.IO.FileSystem/tests/FileInfo/Exists.cs b/src/libraries/System.IO.FileSystem/tests/FileInfo/Exists.cs
@@ -90,7 +90,7 @@ public void FalseForDirectory()
 
         [Fact]
         [PlatformSpecific(TestPlatforms.AnyUnix & ~TestPlatforms.Browser)]  // Uses P/Invokes
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/67853", TestPlatforms.tvOS)]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/67853", TestPlatforms.iOS | TestPlatforms.tvOS)]
         public void TrueForNonRegularFile()
         {
             string fileName = GetTestFilePath();

diff --git a/src/libraries/System.IO.FileSystem/tests/FileStream/DevicesPipesAndSockets.cs b/src/libraries/System.IO.FileSystem/tests/FileStream/DevicesPipesAndSockets.cs
@@ -63,8 +63,8 @@ public async Task CharacterDevice_WriteAllTextAsync(string devicePath)
 
         [Fact]
         [PlatformSpecific(TestPlatforms.AnyUnix & ~TestPlatforms.Browser)]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/67853", TestPlatforms.tvOS)]
-        [SkipOnPlatform(TestPlatforms.LinuxBionic, "SElinux blocks UNIX sockets")]
+        [SkipOnPlatform(TestPlatforms.LinuxBionic, "SElinux blocks UNIX sockets in our CI environment")]
+        [SkipOnPlatform(TestPlatforms.iOS | TestPlatforms.tvOS, "iOS/tvOS blocks binding to UNIX sockets")]
         public async Task NamedPipe_ReadWrite()
         {
             string fifoPath = GetTestFilePath();
@@ -85,8 +85,8 @@ await Task.WhenAll(
 
         [Fact]
         [PlatformSpecific(TestPlatforms.AnyUnix & ~TestPlatforms.Browser)]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/67853", TestPlatforms.tvOS)]
-        [SkipOnPlatform(TestPlatforms.LinuxBionic, "SElinux blocks UNIX sockets")]
+        [SkipOnPlatform(TestPlatforms.LinuxBionic, "SElinux blocks UNIX sockets in our CI environment")]
+        [SkipOnPlatform(TestPlatforms.iOS | TestPlatforms.tvOS, "iOS/tvOS blocks binding to UNIX sockets")]
         public async Task NamedPipe_ReadWrite_Async()
         {
             string fifoPath = GetTestFilePath();

diff --git a/src/libraries/System.IO.FileSystem/tests/Path/Exists_File.cs b/src/libraries/System.IO.FileSystem/tests/Path/Exists_File.cs
@@ -22,7 +22,7 @@ public void PathAlreadyExistsAsDirectory()
 
         [Fact]
         [PlatformSpecific(TestPlatforms.AnyUnix & ~TestPlatforms.Browser)]  // Uses P/Invokes
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/67853", TestPlatforms.tvOS)]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/67853", TestPlatforms.iOS | TestPlatforms.tvOS)]
         public void TrueForNonRegularFile()
         {
             string fileName = GetTestFilePath();

diff --git a/src/libraries/System.IO.Pipes/tests/NamedPipeTests/NamedPipeTest.CreateServer.cs b/src/libraries/System.IO.Pipes/tests/NamedPipeTests/NamedPipeTest.CreateServer.cs
@@ -55,14 +55,16 @@ public static void ReservedPipeName_Throws_ArgumentOutOfRangeException(PipeDirec
             AssertExtensions.Throws<ArgumentOutOfRangeException>("pipeName", () => new NamedPipeServerStream(reservedName, direction, 1, PipeTransmissionMode.Byte, PipeOptions.None, 0, 0));}
 
         [Fact]
-        [SkipOnPlatform(TestPlatforms.LinuxBionic, "SElinux blocks UNIX sockets")]
+        [SkipOnPlatform(TestPlatforms.LinuxBionic, "SElinux blocks UNIX sockets in our CI environment")]
+        [SkipOnPlatform(TestPlatforms.iOS | TestPlatforms.tvOS, "iOS/tvOS blocks binding to UNIX sockets")]
         public static void Create_PipeName()
         {
             new NamedPipeServerStream(PipeStreamConformanceTests.GetUniquePipeName()).Dispose();
         }
 
         [Fact]
-        [SkipOnPlatform(TestPlatforms.LinuxBionic, "SElinux blocks UNIX sockets")]
+        [SkipOnPlatform(TestPlatforms.LinuxBionic, "SElinux blocks UNIX sockets in our CI environment")]
+        [SkipOnPlatform(TestPlatforms.iOS | TestPlatforms.tvOS, "iOS/tvOS blocks binding to UNIX sockets")]
         public static void Create_PipeName_Direction_MaxInstances()
         {
             new NamedPipeServerStream(PipeStreamConformanceTests.GetUniquePipeName(), PipeDirection.Out, 1).Dispose();
@@ -207,7 +209,8 @@ public static void Windows_CreateFromDisposedServerHandle_Throws_ObjectDisposedE
 
         [Fact]
         [PlatformSpecific(TestPlatforms.AnyUnix)] // accessing SafePipeHandle on Unix fails for a non-connected stream
-        [SkipOnPlatform(TestPlatforms.LinuxBionic, "SElinux blocks UNIX sockets")]
+        [SkipOnPlatform(TestPlatforms.LinuxBionic, "SElinux blocks UNIX sockets in our CI environment")]
+        [SkipOnPlatform(TestPlatforms.iOS | TestPlatforms.tvOS, "iOS/tvOS blocks binding to UNIX sockets")]
         public static void Unix_GetHandleOfNewServerStream_Throws_InvalidOperationException()
         {
             using (var pipe = new NamedPipeServerStream(PipeStreamConformanceTests.GetUniquePipeName(), PipeDirection.Out, 1, PipeTransmissionMode.Byte))

diff --git a/src/libraries/System.IO.Pipes/tests/NamedPipeTests/NamedPipeTest.CrossProcess.cs b/src/libraries/System.IO.Pipes/tests/NamedPipeTests/NamedPipeTest.CrossProcess.cs
@@ -14,7 +14,7 @@ namespace System.IO.Pipes.Tests
     public sealed class NamedPipeTest_CrossProcess
     {
         [ConditionalFact(typeof(RemoteExecutor), nameof(RemoteExecutor.IsSupported))]
-        [SkipOnPlatform(TestPlatforms.LinuxBionic, "SElinux blocks UNIX sockets")]
+        [SkipOnPlatform(TestPlatforms.LinuxBionic, "SElinux blocks UNIX sockets in our CI environment")]
         public void InheritHandles_AvailableInChildProcess()
         {
             string pipeName = PipeStreamConformanceTests.GetUniquePipeName();
@@ -46,7 +46,7 @@ void ChildFunc(string handle)
         }
 
         [ConditionalFact(typeof(RemoteExecutor), nameof(RemoteExecutor.IsSupported))]
-        [SkipOnPlatform(TestPlatforms.LinuxBionic, "SElinux blocks UNIX sockets")]
+        [SkipOnPlatform(TestPlatforms.LinuxBionic, "SElinux blocks UNIX sockets in our CI environment")]
         public void PingPong_Sync()
         {
             // Create names for two pipes
@@ -73,7 +73,7 @@ public void PingPong_Sync()
         }
 
         [ConditionalFact(typeof(RemoteExecutor), nameof(RemoteExecutor.IsSupported))]
-        [SkipOnPlatform(TestPlatforms.LinuxBionic, "SElinux blocks UNIX sockets")]
+        [SkipOnPlatform(TestPlatforms.LinuxBionic, "SElinux blocks UNIX sockets in our CI environment")]
         public async Task PingPong_Async()
         {
             // Create names for two pipes

diff --git a/src/libraries/System.IO.Pipes/tests/NamedPipeTests/NamedPipeTest.Specific.cs b/src/libraries/System.IO.Pipes/tests/NamedPipeTests/NamedPipeTest.Specific.cs
@@ -31,6 +31,7 @@ public void InvalidConnectTimeout_Throws_ArgumentOutOfRangeException()
         }
 
         [Fact]
+        [SkipOnPlatform(TestPlatforms.iOS | TestPlatforms.tvOS, "iOS/tvOS blocks binding to UNIX sockets")]
         public async Task ConnectToNonExistentServer_Throws_TimeoutException()
         {
             using (NamedPipeClientStream client = new NamedPipeClientStream(".", "notthere"))
@@ -46,6 +47,7 @@ await Assert.ThrowsAsync<TimeoutException>(() =>
         }
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
+        [SkipOnPlatform(TestPlatforms.iOS | TestPlatforms.tvOS, "iOS/tvOS blocks binding to UNIX sockets")]
         public async Task CancelConnectToNonExistentServer_Throws_OperationCanceledException()
         {
             using (NamedPipeClientStream client = new NamedPipeClientStream(".", "notthere"))
@@ -85,7 +87,8 @@ public void ConnectWithConflictingDirections_Throws_UnauthorizedAccessException(
         [Theory]
         [InlineData(1)]
         [InlineData(3)]
-        [SkipOnPlatform(TestPlatforms.LinuxBionic, "SElinux blocks UNIX sockets")]
+        [SkipOnPlatform(TestPlatforms.LinuxBionic, "SElinux blocks UNIX sockets in our CI environment")]
+        [SkipOnPlatform(TestPlatforms.iOS | TestPlatforms.tvOS, "iOS/tvOS blocks binding to UNIX sockets")]
         public async Task MultipleWaitingClients_ServerServesOneAtATime(int numClients)
         {
             string name = PipeStreamConformanceTests.GetUniquePipeName();
@@ -121,7 +124,8 @@ async Task ConnectClientAndReadAsync()
         }
 
         [Fact]
-        [SkipOnPlatform(TestPlatforms.LinuxBionic, "SElinux blocks UNIX sockets")]
+        [SkipOnPlatform(TestPlatforms.LinuxBionic, "SElinux blocks UNIX sockets in our CI environment")]
+        [SkipOnPlatform(TestPlatforms.iOS | TestPlatforms.tvOS, "iOS/tvOS blocks binding to UNIX sockets")]
         public void MaxNumberOfServerInstances_TooManyServers_Throws()
         {
             string name = PipeStreamConformanceTests.GetUniquePipeName();
@@ -159,7 +163,8 @@ public void MaxNumberOfServerInstances_TooManyServers_Throws()
         [Theory]
         [InlineData(1)]
         [InlineData(4)]
-        [SkipOnPlatform(TestPlatforms.LinuxBionic, "SElinux blocks UNIX sockets")]
+        [SkipOnPlatform(TestPlatforms.LinuxBionic, "SElinux blocks UNIX sockets in our CI environment")]
+        [SkipOnPlatform(TestPlatforms.iOS | TestPlatforms.tvOS, "iOS/tvOS blocks binding to UNIX sockets")]
         public async Task MultipleServers_ServeMultipleClientsConcurrently(int numServers)
         {
             string name = PipeStreamConformanceTests.GetUniquePipeName();
@@ -356,7 +361,8 @@ public async Task Windows_GetImpersonationUserName_Succeed(TokenImpersonationLev
 
         [Fact]
         [PlatformSpecific(TestPlatforms.AnyUnix)]  // Uses P/Invoke to verify the user name
-        [SkipOnPlatform(TestPlatforms.LinuxBionic, "SElinux blocks UNIX sockets")]
+        [SkipOnPlatform(TestPlatforms.LinuxBionic, "SElinux blocks UNIX sockets in our CI environment")]
+        [SkipOnPlatform(TestPlatforms.iOS | TestPlatforms.tvOS, "iOS/tvOS blocks binding to UNIX sockets")]
         public async Task Unix_GetImpersonationUserName_Succeed()
         {
             string pipeName = PipeStreamConformanceTests.GetUniquePipeName();
@@ -387,7 +393,8 @@ public void Unix_MessagePipeTransmissionMode()
         [InlineData(PipeDirection.Out)]
         [InlineData(PipeDirection.InOut)]
         [PlatformSpecific(TestPlatforms.AnyUnix)] // Unix implementation uses bidirectional sockets
-        [SkipOnPlatform(TestPlatforms.LinuxBionic, "SElinux blocks UNIX sockets")]
+        [SkipOnPlatform(TestPlatforms.LinuxBionic, "SElinux blocks UNIX sockets in our CI environment")]
+        [SkipOnPlatform(TestPlatforms.iOS | TestPlatforms.tvOS, "iOS/tvOS blocks binding to UNIX sockets")]
         public static void Unix_BufferSizeRoundtripping(PipeDirection direction)
         {
             int desiredBufferSize = 0;
@@ -451,7 +458,8 @@ public static void Windows_BufferSizeRoundtripping()
         }
 
         [Fact]
-        [SkipOnPlatform(TestPlatforms.LinuxBionic, "SElinux blocks UNIX sockets")]
+        [SkipOnPlatform(TestPlatforms.LinuxBionic, "SElinux blocks UNIX sockets in our CI environment")]
+        [SkipOnPlatform(TestPlatforms.iOS | TestPlatforms.tvOS, "iOS/tvOS blocks binding to UNIX sockets")]
         public async Task PipeTransmissionMode_Returns_Byte()
         {
             string pipeName = PipeStreamConformanceTests.GetUniquePipeName();
@@ -507,7 +515,8 @@ public void Windows_SetReadModeTo__PipeTransmissionModeByte()
 
         [Fact]
         [PlatformSpecific(TestPlatforms.AnyUnix)] // Unix doesn't currently support message mode
-        [SkipOnPlatform(TestPlatforms.LinuxBionic, "SElinux blocks UNIX sockets")]
+        [SkipOnPlatform(TestPlatforms.LinuxBionic, "SElinux blocks UNIX sockets in our CI environment")]
+        [SkipOnPlatform(TestPlatforms.iOS | TestPlatforms.tvOS, "iOS/tvOS blocks binding to UNIX sockets")]
         public void Unix_SetReadModeTo__PipeTransmissionModeByte()
         {
             string pipeName = PipeStreamConformanceTests.GetUniquePipeName();
@@ -548,7 +557,8 @@ public void Unix_SetReadModeTo__PipeTransmissionModeByte()
         [Theory]
         [InlineData(PipeDirection.Out, PipeDirection.In)]
         [InlineData(PipeDirection.In, PipeDirection.Out)]
-        [SkipOnPlatform(TestPlatforms.LinuxBionic, "SElinux blocks UNIX sockets")]
+        [SkipOnPlatform(TestPlatforms.LinuxBionic, "SElinux blocks UNIX sockets in our CI environment")]
+        [SkipOnPlatform(TestPlatforms.iOS | TestPlatforms.tvOS, "iOS/tvOS blocks binding to UNIX sockets")]
         public void InvalidReadMode_Throws_ArgumentOutOfRangeException(PipeDirection serverDirection, PipeDirection clientDirection)
         {
             string pipeName = PipeStreamConformanceTests.GetUniquePipeName();
@@ -566,7 +576,8 @@ public void InvalidReadMode_Throws_ArgumentOutOfRangeException(PipeDirection ser
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
         [PlatformSpecific(TestPlatforms.AnyUnix)]  // Checks MaxLength for PipeName on Unix
-        [SkipOnPlatform(TestPlatforms.LinuxBionic, "SElinux blocks UNIX sockets")]
+        [SkipOnPlatform(TestPlatforms.LinuxBionic, "SElinux blocks UNIX sockets in our CI environment")]
+        [SkipOnPlatform(TestPlatforms.iOS | TestPlatforms.tvOS, "iOS/tvOS blocks binding to UNIX sockets")]
         public void NameTooLong_MaxLengthPerPlatform()
         {
             // Increase a name's length until it fails
@@ -611,6 +622,7 @@ public void NameTooLong_MaxLengthPerPlatform()
         }
 
         [Fact]
+        [SkipOnPlatform(TestPlatforms.iOS | TestPlatforms.tvOS, "iOS/tvOS blocks binding to UNIX sockets")]
         public void ClientConnect_Throws_Timeout_When_Pipe_Not_Found()
         {
             string pipeName = PipeStreamConformanceTests.GetUniquePipeName();
@@ -622,6 +634,7 @@ public void ClientConnect_Throws_Timeout_When_Pipe_Not_Found()
 
         [Theory]
         [MemberData(nameof(GetCancellationTokens))]
+        [SkipOnPlatform(TestPlatforms.iOS | TestPlatforms.tvOS, "iOS/tvOS blocks binding to UNIX sockets")]
         public async Task ClientConnectAsync_Throws_Timeout_When_Pipe_Not_Found(CancellationToken cancellationToken)
         {
             string pipeName = PipeStreamConformanceTests.GetUniquePipeName();