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[release/6.0] for non-seekable file handles, the OVERLAPPED offset must be set to 0 #60931

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[release/6.0] for non-seekable file handles, the OVERLAPPED offset must be set to 0 #60931

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4 changes: 2 additions & 2 deletions src/libraries/System.Private.CoreLib/src/System/IO/Strategies/OSFileStreamStrategy.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -294,7 +294,7 @@ public sealed override Task WriteAsync(byte[] buffer, int offset, int count, Can

public sealed override ValueTask WriteAsync(ReadOnlyMemory<byte> source, CancellationToken cancellationToken)
{
long writeOffset = CanSeek ? Interlocked.Add(ref _filePosition, source.Length) - source.Length : -1;
long writeOffset = CanSeek ? Interlocked.Add(ref _filePosition, source.Length) - source.Length : 0;
return RandomAccess.WriteAtOffsetAsync(_fileHandle, source, writeOffset, cancellationToken, this);
}

Expand All @@ -311,7 +311,7 @@ public sealed override ValueTask<int> ReadAsync(Memory<byte> destination, Cancel
{
if (!CanSeek)
{
return RandomAccess.ReadAtOffsetAsync(_fileHandle, destination, fileOffset: -1, cancellationToken);
return RandomAccess.ReadAtOffsetAsync(_fileHandle, destination, fileOffset: 0, cancellationToken);
}

if (LengthCachingSupported && _length >= 0 && Volatile.Read(ref _filePosition) >= _length)
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