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Replace FileAllocationInfo with FileEndOfFileInfo #119051

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Merged
merged 1 commit into from
Dec 18, 2023
Merged

Replace FileAllocationInfo with FileEndOfFileInfo #119051

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14 changes: 8 additions & 6 deletions library/std/src/sys/windows/fs.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -309,14 +309,16 @@ impl File {
&& unsafe { c::GetLastError() } == c::ERROR_ALREADY_EXISTS
{
unsafe {
// Setting the allocation size to zero also sets the
// EOF position to zero.
let alloc = c::FILE_ALLOCATION_INFO { AllocationSize: 0 };
// This originally used `FileAllocationInfo` instead of
// `FileEndOfFileInfo` but that wasn't supported by WINE.
// It's arguable which fits the semantics of `OpenOptions`
// better so let's just use the more widely supported method.
let eof = c::FILE_END_OF_FILE_INFO { EndOfFile: 0 };
let result = c::SetFileInformationByHandle(
handle.as_raw_handle(),
c::FileAllocationInfo,
ptr::addr_of!(alloc).cast::<c_void>(),
mem::size_of::<c::FILE_ALLOCATION_INFO>() as u32,
c::FileEndOfFileInfo,
ptr::addr_of!(eof).cast::<c_void>(),
mem::size_of::<c::FILE_END_OF_FILE_INFO>() as u32,
);
if result == 0 {
return Err(io::Error::last_os_error());
Expand Down