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Windows: Fallback for overlapped I/O

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Try waiting on the file handle once. If that fails then give up.
This commit is contained in:
Chris Denton 2022-07-06 16:38:35 +01:00
parent ae60dbdcac
commit 3ae47e76a8
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GPG key ID: 713472F2F45627DE
2 changed files with 26 additions and 1 deletions
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14
library/std/src/sys/windows/c.rs
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@ -326,7 +326,9 @@ union IO_STATUS_BLOCK_union {
}
impl Default for IO_STATUS_BLOCK_union {
fn default() -> Self {
Self { Pointer: ptr::null_mut() }
let mut this = Self { Pointer: ptr::null_mut() };
this.Status = STATUS_PENDING;
this
}
}
#[repr(C)]
@ -335,6 +337,16 @@ pub struct IO_STATUS_BLOCK {
u: IO_STATUS_BLOCK_union,
pub Information: usize,
}
impl IO_STATUS_BLOCK {
pub fn status(&self) -> NTSTATUS {
// SAFETY: If `self.u.Status` was set then this is obviously safe.
// If `self.u.Pointer` was set then this is the equivalent to converting
// the pointer to an integer, which is also safe.
// Currently the only safe way to construct `IO_STATUS_BLOCK` outside of
// this module is to call the `default` method, which sets the `Status`.
unsafe { self.u.Status }
}
}
pub type LPOVERLAPPED_COMPLETION_ROUTINE = unsafe extern "system" fn(
dwErrorCode: DWORD,