Skip to content

Fix Overlapped I/O by boxing OVERLAPPED struct and accept overlapped arg positionally #7198

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
youknowone merged 1 commit into from
Feb 22, 2026
Merged

Fix Overlapped I/O by boxing OVERLAPPED struct and accept overlapped arg positionally #7198

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
34 changes: 19 additions & 15 deletions crates/vm/src/stdlib/_winapi.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -800,7 +800,11 @@ mod _winapi {
}

struct OverlappedInner {
overlapped: windows_sys::Win32::System::IO::OVERLAPPED,
// Box ensures the OVERLAPPED struct stays at a stable heap address
// even when the containing Overlapped Python object is moved during
// into_pyobject(). The OS holds a pointer to this struct for pending
// I/O operations, so it must not be relocated.
overlapped: Box<windows_sys::Win32::System::IO::OVERLAPPED>,
handle: HANDLE,
pending: bool,
completed: bool,
Expand Down Expand Up @@ -833,7 +837,7 @@ mod _winapi {

Overlapped {
inner: PyMutex::new(OverlappedInner {
overlapped,
overlapped: Box::new(overlapped),
handle,
pending: false,
completed: false,
Expand All @@ -858,7 +862,7 @@ mod _winapi {
let ret = unsafe {
GetOverlappedResult(
inner.handle,
&inner.overlapped,
&*inner.overlapped,
&mut transferred,
if wait { 1 } else { 0 },
)
Expand Down Expand Up @@ -913,7 +917,7 @@ mod _winapi {

let mut inner = self.inner.lock();
let ret = if inner.pending {
unsafe { CancelIoEx(inner.handle, &inner.overlapped) }
unsafe { CancelIoEx(inner.handle, &*inner.overlapped) }
} else {
1
};
Expand Down Expand Up @@ -958,9 +962,9 @@ mod _winapi {
/// ConnectNamedPipe - Wait for a client to connect to a named pipe
#[derive(FromArgs)]
struct ConnectNamedPipeArgs {
#[pyarg(positional)]
#[pyarg(any)]
handle: WinHandle,
#[pyarg(named, optional)]
#[pyarg(any, optional)]
overlapped: OptionalArg<bool>,
}

Expand All @@ -982,7 +986,7 @@ mod _winapi {
unsafe {
windows_sys::Win32::System::Pipes::ConnectNamedPipe(
handle.0,
&mut inner.overlapped,
&mut *inner.overlapped,
)
}
};
Expand Down Expand Up @@ -1200,11 +1204,11 @@ mod _winapi {

#[derive(FromArgs)]
struct WriteFileArgs {
#[pyarg(positional)]
#[pyarg(any)]
handle: WinHandle,
#[pyarg(positional)]
#[pyarg(any)]
buffer: crate::function::ArgBytesLike,
#[pyarg(named, default = false)]
#[pyarg(any, default = false)]
overlapped: bool,
}

Expand Down Expand Up @@ -1233,7 +1237,7 @@ mod _winapi {
write_buf.as_ptr() as *const _,
len,
&mut written,
&mut inner.overlapped,
&mut *inner.overlapped,
)
};

Expand Down Expand Up @@ -1287,11 +1291,11 @@ mod _winapi {

#[derive(FromArgs)]
struct ReadFileArgs {
#[pyarg(positional)]
#[pyarg(any)]
handle: WinHandle,
#[pyarg(positional)]
#[pyarg(any)]
size: u32,
#[pyarg(named, default = false)]
#[pyarg(any, default = false)]
overlapped: bool,
}

Expand Down Expand Up @@ -1319,7 +1323,7 @@ mod _winapi {
read_buf.as_mut_ptr() as *mut _,
size,
&mut nread,
&mut inner.overlapped,
&mut *inner.overlapped,
)
};

Expand Down
Loading