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Set of offset-based APIs for thread-safe file IO #53669
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…Helpers to SafeFileHandle itself
…le.OpenHandle to FileStreamHelpers
…omFile.ReadAtOffset are going to need it)
…s it's a Windows-specific concept
…Seek for regular files
Co-authored-by: Stephen Toub <[email protected]>
* with NtCreateFile there is no need for Validation (NtCreateFile returns error and we never create a safe file handle) * unify status codes * complete error mapping
src/libraries/System.Private.CoreLib/src/Microsoft/Win32/SafeHandles/SafeFileHandle.Windows.cs
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src/libraries/System.Private.CoreLib/src/System/IO/File.netcoreapp.cs
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src/libraries/System.Private.CoreLib/src/System/IO/RandomAccess.Unix.cs
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src/libraries/System.Private.CoreLib/src/System/IO/RandomAccess.Windows.cs
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src/libraries/System.Private.CoreLib/src/System/IO/RandomAccess.Windows.cs
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Co-authored-by: Stephen Toub <[email protected]>
{ | ||
public byte* Base; | ||
public UIntPtr Count; | ||
} |
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Nit: nuint
src/libraries/Common/src/Interop/Windows/Kernel32/Interop.FileScatterGather.cs
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|
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int64_t count = 0; | ||
int fileDescriptor = ToFileDescriptor(fd); | ||
#if HAVE_PREADV && !defined(TARGET_WASM) // preadv is buggy on WASM |
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Let's open an issue in runtime for now and include the link here.
@@ -41,6 +41,14 @@ typedef struct | |||
// add more fields when needed. | |||
} ProcessStatus; | |||
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// NOTE: the layout of this type is intended to exactly match the layout of a `struct iovec`. There are | |||
// assertions in pal_networking.c that validate this. |
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Should we move them to here?
runtime/src/libraries/Native/Unix/System.Native/pal_networking.c
Lines 163 to 168 in c87354c
// We require that IOVector have the same layout as iovec. | |
c_static_assert(sizeof(IOVector) == sizeof(iovec)); | |
c_static_assert(sizeof_member(IOVector, Base) == sizeof_member(iovec, iov_base)); | |
c_static_assert(offsetof(IOVector, Base) == offsetof(iovec, iov_base)); | |
c_static_assert(sizeof_member(IOVector, Count) == sizeof_member(iovec, iov_len)); | |
c_static_assert(offsetof(IOVector, Count) == offsetof(iovec, iov_len)); |
src/libraries/System.Private.CoreLib/src/System/IO/RandomAccess.Unix.cs
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src/libraries/System.Private.CoreLib/src/System/IO/RandomAccess.Windows.cs
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src/libraries/System.Private.CoreLib/src/System/IO/RandomAccess.Windows.cs
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src/libraries/System.Private.CoreLib/src/System/IO/Strategies/SyncWindowsFileStreamStrategy.cs
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src/libraries/System.Private.CoreLib/src/System/IO/Strategies/SyncWindowsFileStreamStrategy.cs
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Co-authored-by: Stephen Toub <[email protected]>
@adamsitnik this change has broken my local build on Apple Silicon. It fails with:
However the checks for HAVE_PREADV and HAVE_PWRITEV in the configuration have succeeded. I suspect that the functions have moved to a different header file in recent SDK and the pal_io.c doesn't include it. But I am not sure yet. |
Btw, this was a clean build after git clean -xdf. |
I can see that the preadv / pwritew in my SDK are available only if: |
Nevermind, I see you already checked the headers meanwhile. Also I realized that the Apple Silicon version may target macOS 11 as minimum (unlike the x64 one). |
Adding |
I've moved all the logic responsible for opening and initializing
SafeFileHandle
toSafeFileHandle
. A lot of duplicated code (mostly for initializingThreadPoolBinding
) got removed. On Unix, it's also now much more clear how many syscalls we perform to just open a file.Other changes:
NtCreateFile
for cases whenpreallocationSize
was specified andCreateFileW
when not, I've followed @JeremyKuhne suggestion and switched to usingNtCreateFile
only. This has simplified the code and provided some minor perf gain. I've discovered a bug in the previous implementation (related toDesiredAccess.DELETE
) fixed it, and added a testfstat()
to ensure that a given file is not a directory we can also determine whether a given file is seekable or not. This has removed one syscall for the initialization ofCanSeek
.Fixes #24847
@carlossanlop @jozkee @stephentoub PTAL. Once this PR is merged, I would like to finally publish the .NET Blog post.
cc @alexbudmsft