Fix setting creation date for OSX-like platforms

src/libraries/Common/src/Interop/OSX/Interop.Libraries.cs

@@ -15,5 +15,6 @@ internal static partial class Libraries
         internal const string SystemConfigurationLibrary = "/System/Library/Frameworks/SystemConfiguration.framework/SystemConfiguration";
         internal const string AppleCryptoNative = "libSystem.Security.Cryptography.Native.Apple";
         internal const string MsQuic = "libmsquic.dylib";
+        internal const string libc = "libc";
     }
 }

src/libraries/Common/src/Interop/OSX/Interop.libc.cs

@@ -0,0 +1,29 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System;
+using System.Runtime.InteropServices;
+
+internal static partial class Interop
+{
+    internal static partial class libc
+    {
+        [StructLayout(LayoutKind.Sequential)]
+        internal struct AttrList
+        {
+            public ushort bitmapCount;
+            public ushort reserved;
+            public uint commonAttr;
+            public uint volAttr;
+            public uint dirAttr;
+            public uint fileAttr;
+            public uint forkAttr;
+
+            public const ushort ATTR_BIT_MAP_COUNT = 5;
+            public const uint ATTR_CMN_CRTIME = 0x00000200;
+        }
+
+        [DllImport(Libraries.libc, EntryPoint = "setattrlist", SetLastError = true)]
+        internal static unsafe extern int setattrlist(string path, AttrList* attrList, void* attrBuf, nint attrBufSize, CULong options);
+    }
+}

src/libraries/System.IO.FileSystem/tests/Base/BaseGetSetTimes.cs

@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 using System.Collections.Generic;
+using System.Linq;
 using System.Threading;
 using Xunit;
 
@@ -70,6 +71,62 @@ public void SettingUpdatesProperties()
             });
         }
 
+        [Fact]
+        [PlatformSpecific(~TestPlatforms.Browser)]
+        public void SettingUpdatesPropertiesAfterAnother()
+        {
+            // Browser is excluded as there is only 1 effective time store.
+
+            T item = GetExistingItem();
+
+            // These linq calls make an IEnumerable of pairs of functions that are not identical
+            // (eg. not (creationtime, creationtime)), includes both orders as seperate entries
+            // as they it have different behavior in reverse order (of functions), in addition
+            // to the pairs of functions, there is a reverse bool that allows a test for both
+            // increasing and decreasing timestamps as to not limit the test unnecessarily.
+            // Only testing with utc because it would be hard to check if lastwrite utc was the
+            // same type of method as lastwrite local since their .Getter fields are different.
+            // This test is required as some apis change more dates then they're supposed to.
+            // There were issues while developing this PR with specific orders of changes, so
+            // this code should almost fully eliminate any possibilities of that in the future
+            // by having a proper test for it. Also, it should be noted that the combination
+            // (A, B, false) is not the same as (B, A, true).
+
+            // The order that these LINQ expression creates is (when all 3 are available):
+            // [0] = (creation, access, False), [1] = (creation, access, True),  [2] = (creation, write, False),
+            // [3] = (creation, write, True),   [4] = (access, creation, False), [5] = (access, creation, True),
+            // [6] = (access, write, False),    [7] = (access, write, True),     [8] = (write, creation, False),
+            // [9] = (write, creation, True),  [10] = (write, access, False),   [11] = (write, access, True)
+            // Or, when creation time setting is not available:
+            // [0] = (access, write, False),    [1] = (access, write, True),
+            // [2] = (write, access, False),    [3] = (write, access, True)
+
+            IEnumerable<TimeFunction> timeFunctionsUtc = TimeFunctions(requiresRoundtripping: true).Where((f) => f.Kind == DateTimeKind.Utc);
+            var booleanArray = new bool[] { false, true };
+            Assert.All(timeFunctionsUtc.SelectMany((x) => timeFunctionsUtc.SelectMany((y) => booleanArray.Select((reverse) => (x, y, reverse)))).Where((fs) => fs.x.Getter != fs.y.Getter), (functions) =>
+            {
+                var function1 = functions.x;
+                var function2 = functions.y;
+                var reverse = functions.reverse;
+
+                // Checking that milliseconds are not dropped after setter.
+                DateTime dt1 = new DateTime(2002, 12, 1, 12, 3, 3, LowTemporalResolution ? 0 : 321, DateTimeKind.Utc);
+                DateTime dt2 = new DateTime(2001, 12, 1, 12, 3, 3, LowTemporalResolution ? 0 : 321, DateTimeKind.Utc);
+                DateTime dt3 = new DateTime(2000, 12, 1, 12, 3, 3, LowTemporalResolution ? 0 : 321, DateTimeKind.Utc);
+                if (reverse) //reverse the order of setting dates
+                {
+                    (dt1, dt3) = (dt3, dt1);
+                }
+                function1.Setter(item, dt1);
+                function2.Setter(item, dt2);
+                function1.Setter(item, dt3);
+                DateTime result1 = function1.Getter(item);
+                DateTime result2 = function2.Getter(item);
+                Assert.Equal(dt3, result1);
+                Assert.Equal(dt2, result2);
+            });
+        }
+
         [Fact]
         public void CanGetAllTimesAfterCreation()
         {

src/libraries/System.IO.FileSystem/tests/PortedCommon/IOInputs.cs

@@ -8,8 +8,8 @@
 
 internal static class IOInputs
 {
-    public static bool SupportsSettingCreationTime => OperatingSystem.IsWindows();
-    public static bool SupportsGettingCreationTime => OperatingSystem.IsWindows() || OperatingSystem.IsMacOS();
+    public static bool SupportsSettingCreationTime => PlatformDetection.IsWindows || PlatformDetection.IsOSXLike;
+    public static bool SupportsGettingCreationTime => PlatformDetection.IsWindows || PlatformDetection.IsOSXLike;
 
     // Max path length (minus trailing \0). Unix values vary system to system; just using really long values here likely to be more than on the average system.
     public static readonly int MaxPath = OperatingSystem.IsWindows() ? 259 : 10000;

src/libraries/System.Private.CoreLib/src/System.Private.CoreLib.Shared.projitems

@@ -2151,6 +2151,9 @@
     <Compile Include="$(MSBuildThisFileDirectory)System\TimeZoneInfo.Unix.Android.cs" Condition="'$(TargetsAndroid)' == 'true'" />
     <Compile Include="$(MSBuildThisFileDirectory)System\TimeZoneInfo.Unix.NonAndroid.cs" Condition="'$(TargetsAndroid)' != 'true'" />
   </ItemGroup>
+  <ItemGroup Condition="('$(TargetsUnix)' == 'true' or '$(TargetsBrowser)' == 'true') and '$(IsOSXLike)' != 'true'">
+    <Compile Include="$(MSBuildThisFileDirectory)System\IO\FileStatus.SetTimes.OtherUnix.cs" />
+  </ItemGroup>
   <ItemGroup Condition="'$(TargetsUnix)' == 'true'">
     <Compile Include="$(CommonPath)Interop\Unix\System.Native\Interop.GetEUid.cs">
       <Link>Common\Interop\Unix\System.Native\Interop.GetEUid.cs</Link>
@@ -2198,6 +2201,10 @@
     <Compile Include="$(CommonPath)Interop\OSX\Interop.Libraries.cs">
       <Link>Common\Interop\OSX\Interop.Libraries.cs</Link>
     </Compile>
+    <Compile Include="$(CommonPath)Interop\OSX\Interop.libc.cs">
+      <Link>Common\Interop\OSX\Interop.libc.cs</Link>
+    </Compile>
+    <Compile Include="$(MSBuildThisFileDirectory)System\IO\FileStatus.SetTimes.OSX.cs" />
   </ItemGroup>
   <ItemGroup Condition="'$(TargetsMacCatalyst)' == 'true'">
     <Compile Include="$(CommonPath)Interop\OSX\System.Native\Interop.iOSSupportVersion.cs" Link="Common\Interop\OSX\System.Native\Interop.iOSSupportVersion.cs" />

src/libraries/System.Private.CoreLib/src/System/IO/FileStatus.SetTimes.OSX.cs

@@ -0,0 +1,60 @@
+// 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.InteropServices;
+
+namespace System.IO
+{
+    internal partial struct FileStatus
+    {
+        internal void SetCreationTime(string path, DateTimeOffset time)
+        {
+            // Try to set the attribute on the file system entry using setattrlist,
+            // if we get ENOTSUP then it means that "The volume does not support
+            // setattrlist()", so we fall back to the method used on other unix
+            // platforms, otherwise we throw an error if we get one, or invalidate
+            // the cache if successful because otherwise it has invalid information.
+            // Note: the unix fallback implementation doesn't have a test as we are
+            // yet to determine which volume types it can fail on, so modify with
+            // great care.
+            long seconds = time.ToUnixTimeSeconds();
+            long nanoseconds = UnixTimeSecondsToNanoseconds(time, seconds);
+            Interop.Error error = SetCreationTimeCore(path, seconds, nanoseconds);
+
+            if (error == Interop.Error.SUCCESS)
+            {
+                InvalidateCaches();
+            }
+            else if (error == Interop.Error.ENOTSUP)
+            {
+                SetAccessOrWriteTimeCore(path, time, isAccessTime: false, checkCreationTime: false);
+            }
+            else
+            {
+                Interop.CheckIo(error, path, InitiallyDirectory);
+            }
+        }
+
+        private unsafe Interop.Error SetCreationTimeCore(string path, long seconds, long nanoseconds)
+        {
+            Interop.Sys.TimeSpec timeSpec = default;
+
+            timeSpec.TvSec = seconds;
+            timeSpec.TvNsec = nanoseconds;
+
+            Interop.libc.AttrList attrList = default;
+            attrList.bitmapCount = Interop.libc.AttrList.ATTR_BIT_MAP_COUNT;
+            attrList.commonAttr = Interop.libc.AttrList.ATTR_CMN_CRTIME;
+
+            Interop.Error error = 
+                Interop.libc.setattrlist(path, &attrList, &timeSpec, sizeof(Interop.Sys.TimeSpec), default(CULong)) == 0 ? 
+                Interop.Error.Success : 
+                Interop.Sys.GetLastErrorInfo();
+
+            return error;
+        }
+
+        private void SetAccessOrWriteTime(string path, DateTimeOffset time, bool isAccessTime) =>
+            SetAccessOrWriteTimeCore(path, time, isAccessTime, checkCreationTime: true);
+    }
+}

src/libraries/System.Private.CoreLib/src/System/IO/FileStatus.SetTimes.OtherUnix.cs

@@ -0,0 +1,20 @@
+// 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.InteropServices;
+
+namespace System.IO
+{
+    internal partial struct FileStatus
+    {
+        internal void SetCreationTime(string path, DateTimeOffset time) =>
+            SetLastWriteTime(path, time);
+
+        private void SetAccessOrWriteTime(string path, DateTimeOffset time, bool isAccessTime) =>
+            SetAccessOrWriteTimeCore(path, time, isAccessTime, checkCreationTime: false);
+
+        // This is not used on these platforms, but is needed for source compat
+        private Interop.Error SetCreationTimeCore(string path, long seconds, long nanoseconds) =>
+            throw new InvalidOperationException();
+    }
+}

src/libraries/System.Private.CoreLib/src/System/IO/FileStatus.Unix.cs

@@ -6,7 +6,7 @@
 
 namespace System.IO
 {
-    internal struct FileStatus
+    internal partial struct FileStatus
     {
         private const int NanosecondsPerTick = 100;
 
@@ -245,20 +245,6 @@ internal DateTimeOffset GetCreationTime(ReadOnlySpan<char> path, bool continueOn
             return UnixTimeToDateTimeOffset(_fileCache.CTime, _fileCache.CTimeNsec);
         }
 
-        internal void SetCreationTime(string path, DateTimeOffset time)
-        {
-            // Unix provides APIs to update the last access time (atime) and last modification time (mtime).
-            // There is no API to update the CreationTime.
-            // Some platforms (e.g. Linux) don't store a creation time. On those platforms, the creation time
-            // is synthesized as the oldest of last status change time (ctime) and last modification time (mtime).
-            // We update the LastWriteTime (mtime).
-            // This triggers a metadata change for FileSystemWatcher NotifyFilters.CreationTime.
-            // Updating the mtime, causes the ctime to be set to 'now'. So, on platforms that don't store a
-            // CreationTime, GetCreationTime will return the value that was previously set (when that value
-            // wasn't in the future).
-            SetLastWriteTime(path, time);
-        }
-
         internal DateTimeOffset GetLastAccessTime(ReadOnlySpan<char> path, bool continueOnError = false)
         {
             EnsureCachesInitialized(path, continueOnError);
@@ -284,20 +270,29 @@ private DateTimeOffset UnixTimeToDateTimeOffset(long seconds, long nanoseconds)
             return DateTimeOffset.FromUnixTimeSeconds(seconds).AddTicks(nanoseconds / NanosecondsPerTick);
         }
 
-        private unsafe void SetAccessOrWriteTime(string path, DateTimeOffset time, bool isAccessTime)
+        private unsafe void SetAccessOrWriteTimeCore(string path, DateTimeOffset time, bool isAccessTime, bool checkCreationTime)
         {
+            // This api is used to set creation time on non OSX platforms, and as a fallback for OSX platforms.
+            // The reason why we use it to set 'creation time' is the below comment:
+            // Unix provides APIs to update the last access time (atime) and last modification time (mtime).
+            // There is no API to update the CreationTime.
+            // Some platforms (e.g. Linux) don't store a creation time. On those platforms, the creation time
+            // is synthesized as the oldest of last status change time (ctime) and last modification time (mtime).
+            // We update the LastWriteTime (mtime).
+            // This triggers a metadata change for FileSystemWatcher NotifyFilters.CreationTime.
+            // Updating the mtime, causes the ctime to be set to 'now'. So, on platforms that don't store a
+            // CreationTime, GetCreationTime will return the value that was previously set (when that value
+            // wasn't in the future).
+
             // force a refresh so that we have an up-to-date times for values not being overwritten
-            _initializedFileCache = -1;
+            InvalidateCaches();
             EnsureCachesInitialized(path);
 
             // we use utimes()/utimensat() to set the accessTime and writeTime
             Interop.Sys.TimeSpec* buf = stackalloc Interop.Sys.TimeSpec[2];
 
             long seconds = time.ToUnixTimeSeconds();
-
-            const long TicksPerMillisecond = 10000;
-            const long TicksPerSecond = TicksPerMillisecond * 1000;
-            long nanoseconds = (time.UtcDateTime.Ticks - DateTimeOffset.UnixEpoch.Ticks - seconds * TicksPerSecond) * NanosecondsPerTick;
+            long nanoseconds = UnixTimeSecondsToNanoseconds(time, seconds);
 
 #if TARGET_BROWSER
             buf[0].TvSec = seconds;
@@ -321,7 +316,28 @@ private unsafe void SetAccessOrWriteTime(string path, DateTimeOffset time, bool
             }
 #endif
             Interop.CheckIo(Interop.Sys.UTimensat(path, buf), path, InitiallyDirectory);
-            _initializedFileCache = -1;
+
+            // On OSX-like platforms, when the modification time is less than the creation time (including
+            // when the modification time is already less than but access time is being set), the creation
+            // time is set to the modification time due to the api we're currently using; this is not
+            // desirable behaviour since it is inconsistent with windows behaviour and is not logical to
+            // the programmer (ie. we'd have to document it), so these api calls revert the creation time
+            // when it shouldn't be set (since we're setting modification time and access time here).
+            // checkCreationTime is only true on OSX-like platforms.
+            // allowFallbackToLastWriteTime is ignored on non OSX-like platforms.
+            bool updateCreationTime = checkCreationTime && (_fileCache.Flags & Interop.Sys.FileStatusFlags.HasBirthTime) != 0 &&
+                                        (buf[1].TvSec < _fileCache.BirthTime || (buf[1].TvSec == _fileCache.BirthTime && buf[1].TvNsec < _fileCache.BirthTimeNsec));
+
+            InvalidateCaches();
+
+            if (updateCreationTime)
+            {
+                Interop.Error error = SetCreationTimeCore(path, _fileCache.BirthTime, _fileCache.BirthTimeNsec);
+                if (error != Interop.Error.SUCCESS && error != Interop.Error.ENOTSUP)
+                {
+                    Interop.CheckIo(error, path, InitiallyDirectory);
+                }
+            }
         }
 
         internal long GetLength(ReadOnlySpan<char> path, bool continueOnError = false)
@@ -399,6 +415,13 @@ private void ThrowOnCacheInitializationError(ReadOnlySpan<char> path)
             }
         }
 
+        private static long UnixTimeSecondsToNanoseconds(DateTimeOffset time, long seconds)
+        {
+            const long TicksPerMillisecond = 10000;
+            const long TicksPerSecond = TicksPerMillisecond * 1000;
+            return (time.UtcDateTime.Ticks - DateTimeOffset.UnixEpoch.Ticks - seconds * TicksPerSecond) * NanosecondsPerTick;
+        }
+
         private bool TryRefreshFileCache(ReadOnlySpan<char> path) =>
             VerifyStatCall(Interop.Sys.LStat(path, out _fileCache), out _initializedFileCache);