std/os/windows/io/
handle.rs

1//! Owned and borrowed OS handles.
2
3#![stable(feature = "io_safety", since = "1.63.0")]
4
5use super::raw::{AsRawHandle, FromRawHandle, IntoRawHandle, RawHandle};
6use crate::marker::PhantomData;
7use crate::mem::ManuallyDrop;
8use crate::sys::{AsInner, FromInner, IntoInner, cvt};
9use crate::{fmt, fs, io, ptr, sys};
10
11/// A borrowed handle.
12///
13/// This has a lifetime parameter to tie it to the lifetime of something that
14/// owns the handle.
15///
16/// This uses `repr(transparent)` and has the representation of a host handle,
17/// so it can be used in FFI in places where a handle is passed as an argument,
18/// it is not captured or consumed.
19///
20/// Note that it *may* have the value `-1`, which in `BorrowedHandle` always
21/// represents a valid handle value, such as [the current process handle], and
22/// not `INVALID_HANDLE_VALUE`, despite the two having the same value. See
23/// [here] for the full story.
24///
25/// And, it *may* have the value `NULL` (0), which can occur when consoles are
26/// detached from processes, or when `windows_subsystem` is used.
27///
28/// This type's `.to_owned()` implementation returns another `BorrowedHandle`
29/// rather than an `OwnedHandle`. It just makes a trivial copy of the raw
30/// handle, which is then borrowed under the same lifetime.
31///
32/// [here]: https://devblogs.microsoft.com/oldnewthing/20040302-00/?p=40443
33/// [the current process handle]: https://docs.microsoft.com/en-us/windows/win32/api/processthreadsapi/nf-processthreadsapi-getcurrentprocess#remarks
34#[derive(Copy, Clone)]
35#[repr(transparent)]
36#[stable(feature = "io_safety", since = "1.63.0")]
37pub struct BorrowedHandle<'handle> {
38    handle: RawHandle,
39    _phantom: PhantomData<&'handle OwnedHandle>,
40}
41
42/// An owned handle.
43///
44/// This closes the handle on drop.
45///
46/// Note that it *may* have the value `-1`, which in `OwnedHandle` always
47/// represents a valid handle value, such as [the current process handle], and
48/// not `INVALID_HANDLE_VALUE`, despite the two having the same value. See
49/// [here] for the full story.
50///
51/// And, it *may* have the value `NULL` (0), which can occur when consoles are
52/// detached from processes, or when `windows_subsystem` is used.
53///
54/// `OwnedHandle` uses [`CloseHandle`] to close its handle on drop. As such,
55/// it must not be used with handles to open registry keys which need to be
56/// closed with [`RegCloseKey`] instead.
57///
58/// [`CloseHandle`]: https://docs.microsoft.com/en-us/windows/win32/api/handleapi/nf-handleapi-closehandle
59/// [`RegCloseKey`]: https://docs.microsoft.com/en-us/windows/win32/api/winreg/nf-winreg-regclosekey
60///
61/// [here]: https://devblogs.microsoft.com/oldnewthing/20040302-00/?p=40443
62/// [the current process handle]: https://docs.microsoft.com/en-us/windows/win32/api/processthreadsapi/nf-processthreadsapi-getcurrentprocess#remarks
63#[repr(transparent)]
64#[stable(feature = "io_safety", since = "1.63.0")]
65pub struct OwnedHandle {
66    handle: RawHandle,
67}
68
69/// FFI type for handles in return values or out parameters, where `NULL` is used
70/// as a sentry value to indicate errors, such as in the return value of `CreateThread`. This uses
71/// `repr(transparent)` and has the representation of a host handle, so that it can be used in such
72/// FFI declarations.
73///
74/// The only thing you can usefully do with a `HandleOrNull` is to convert it into an
75/// `OwnedHandle` using its [`TryFrom`] implementation; this conversion takes care of the check for
76/// `NULL`. This ensures that such FFI calls cannot start using the handle without
77/// checking for `NULL` first.
78///
79/// This type may hold any handle value that [`OwnedHandle`] may hold. As with `OwnedHandle`, when
80/// it holds `-1`, that value is interpreted as a valid handle value, such as
81/// [the current process handle], and not `INVALID_HANDLE_VALUE`.
82///
83/// If this holds a non-null handle, it will close the handle on drop.
84///
85/// [the current process handle]: https://docs.microsoft.com/en-us/windows/win32/api/processthreadsapi/nf-processthreadsapi-getcurrentprocess#remarks
86#[repr(transparent)]
87#[stable(feature = "io_safety", since = "1.63.0")]
88#[derive(Debug)]
89pub struct HandleOrNull(RawHandle);
90
91/// FFI type for handles in return values or out parameters, where `INVALID_HANDLE_VALUE` is used
92/// as a sentry value to indicate errors, such as in the return value of `CreateFileW`. This uses
93/// `repr(transparent)` and has the representation of a host handle, so that it can be used in such
94/// FFI declarations.
95///
96/// The only thing you can usefully do with a `HandleOrInvalid` is to convert it into an
97/// `OwnedHandle` using its [`TryFrom`] implementation; this conversion takes care of the check for
98/// `INVALID_HANDLE_VALUE`. This ensures that such FFI calls cannot start using the handle without
99/// checking for `INVALID_HANDLE_VALUE` first.
100///
101/// This type may hold any handle value that [`OwnedHandle`] may hold, except that when it holds
102/// `-1`, that value is interpreted to mean `INVALID_HANDLE_VALUE`.
103///
104/// If holds a handle other than `INVALID_HANDLE_VALUE`, it will close the handle on drop.
105#[repr(transparent)]
106#[stable(feature = "io_safety", since = "1.63.0")]
107#[derive(Debug)]
108pub struct HandleOrInvalid(RawHandle);
109
110// The Windows [`HANDLE`] type may be transferred across and shared between
111// thread boundaries (despite containing a `*mut void`, which in general isn't
112// `Send` or `Sync`).
113//
114// [`HANDLE`]: std::os::windows::raw::HANDLE
115#[stable(feature = "io_safety", since = "1.63.0")]
116unsafe impl Send for OwnedHandle {}
117#[stable(feature = "io_safety", since = "1.63.0")]
118unsafe impl Send for HandleOrNull {}
119#[stable(feature = "io_safety", since = "1.63.0")]
120unsafe impl Send for HandleOrInvalid {}
121#[stable(feature = "io_safety", since = "1.63.0")]
122unsafe impl Send for BorrowedHandle<'_> {}
123#[stable(feature = "io_safety", since = "1.63.0")]
124unsafe impl Sync for OwnedHandle {}
125#[stable(feature = "io_safety", since = "1.63.0")]
126unsafe impl Sync for HandleOrNull {}
127#[stable(feature = "io_safety", since = "1.63.0")]
128unsafe impl Sync for HandleOrInvalid {}
129#[stable(feature = "io_safety", since = "1.63.0")]
130unsafe impl Sync for BorrowedHandle<'_> {}
131
132impl BorrowedHandle<'_> {
133    /// Returns a `BorrowedHandle` holding the given raw handle.
134    ///
135    /// # Safety
136    ///
137    /// The resource pointed to by `handle` must be a valid open handle, it
138    /// must remain open for the duration of the returned `BorrowedHandle`.
139    ///
140    /// Note that it *may* have the value `INVALID_HANDLE_VALUE` (-1), which is
141    /// sometimes a valid handle value. See [here] for the full story.
142    ///
143    /// And, it *may* have the value `NULL` (0), which can occur when consoles are
144    /// detached from processes, or when `windows_subsystem` is used.
145    ///
146    /// [here]: https://devblogs.microsoft.com/oldnewthing/20040302-00/?p=40443
147    #[inline]
148    #[rustc_const_stable(feature = "io_safety", since = "1.63.0")]
149    #[stable(feature = "io_safety", since = "1.63.0")]
150    pub const unsafe fn borrow_raw(handle: RawHandle) -> Self {
151        Self { handle, _phantom: PhantomData }
152    }
153}
154
155#[stable(feature = "io_safety", since = "1.63.0")]
156impl TryFrom<HandleOrNull> for OwnedHandle {
157    type Error = NullHandleError;
158
159    #[inline]
160    fn try_from(handle_or_null: HandleOrNull) -> Result<Self, NullHandleError> {
161        let handle_or_null = ManuallyDrop::new(handle_or_null);
162        if handle_or_null.is_valid() {
163            // SAFETY: The handle is not null.
164            Ok(unsafe { OwnedHandle::from_raw_handle(handle_or_null.0) })
165        } else {
166            Err(NullHandleError(()))
167        }
168    }
169}
170
171#[stable(feature = "io_safety", since = "1.63.0")]
172impl Drop for HandleOrNull {
173    #[inline]
174    fn drop(&mut self) {
175        if self.is_valid() {
176            unsafe {
177                let _ = sys::c::CloseHandle(self.0);
178            }
179        }
180    }
181}
182
183impl OwnedHandle {
184    /// Creates a new `OwnedHandle` instance that shares the same underlying
185    /// object as the existing `OwnedHandle` instance.
186    #[stable(feature = "io_safety", since = "1.63.0")]
187    pub fn try_clone(&self) -> io::Result<Self> {
188        self.as_handle().try_clone_to_owned()
189    }
190}
191
192impl BorrowedHandle<'_> {
193    /// Creates a new `OwnedHandle` instance that shares the same underlying
194    /// object as the existing `BorrowedHandle` instance.
195    #[stable(feature = "io_safety", since = "1.63.0")]
196    pub fn try_clone_to_owned(&self) -> io::Result<OwnedHandle> {
197        self.duplicate(0, false, sys::c::DUPLICATE_SAME_ACCESS)
198    }
199
200    pub(crate) fn duplicate(
201        &self,
202        access: u32,
203        inherit: bool,
204        options: u32,
205    ) -> io::Result<OwnedHandle> {
206        let handle = self.as_raw_handle();
207
208        // `Stdin`, `Stdout`, and `Stderr` can all hold null handles, such as
209        // in a process with a detached console. `DuplicateHandle` would fail
210        // if we passed it a null handle, but we can treat null as a valid
211        // handle which doesn't do any I/O, and allow it to be duplicated.
212        if handle.is_null() {
213            return unsafe { Ok(OwnedHandle::from_raw_handle(handle)) };
214        }
215
216        let mut ret = ptr::null_mut();
217        cvt(unsafe {
218            let cur_proc = sys::c::GetCurrentProcess();
219            sys::c::DuplicateHandle(
220                cur_proc,
221                handle,
222                cur_proc,
223                &mut ret,
224                access,
225                inherit as sys::c::BOOL,
226                options,
227            )
228        })?;
229        unsafe { Ok(OwnedHandle::from_raw_handle(ret)) }
230    }
231}
232
233#[stable(feature = "io_safety", since = "1.63.0")]
234impl TryFrom<HandleOrInvalid> for OwnedHandle {
235    type Error = InvalidHandleError;
236
237    #[inline]
238    fn try_from(handle_or_invalid: HandleOrInvalid) -> Result<Self, InvalidHandleError> {
239        let handle_or_invalid = ManuallyDrop::new(handle_or_invalid);
240        if handle_or_invalid.is_valid() {
241            // SAFETY: The handle is not invalid.
242            Ok(unsafe { OwnedHandle::from_raw_handle(handle_or_invalid.0) })
243        } else {
244            Err(InvalidHandleError(()))
245        }
246    }
247}
248
249#[stable(feature = "io_safety", since = "1.63.0")]
250impl Drop for HandleOrInvalid {
251    #[inline]
252    fn drop(&mut self) {
253        if self.is_valid() {
254            unsafe {
255                let _ = sys::c::CloseHandle(self.0);
256            }
257        }
258    }
259}
260
261/// This is the error type used by [`HandleOrNull`] when attempting to convert
262/// into a handle, to indicate that the value is null.
263// The empty field prevents constructing this, and allows extending it in the future.
264#[stable(feature = "io_safety", since = "1.63.0")]
265#[derive(Debug, Clone, PartialEq, Eq)]
266pub struct NullHandleError(());
267
268#[stable(feature = "io_safety", since = "1.63.0")]
269impl fmt::Display for NullHandleError {
270    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
271        "A HandleOrNull could not be converted to a handle because it was null".fmt(fmt)
272    }
273}
274
275#[stable(feature = "io_safety", since = "1.63.0")]
276impl crate::error::Error for NullHandleError {}
277
278/// This is the error type used by [`HandleOrInvalid`] when attempting to
279/// convert into a handle, to indicate that the value is
280/// `INVALID_HANDLE_VALUE`.
281// The empty field prevents constructing this, and allows extending it in the future.
282#[stable(feature = "io_safety", since = "1.63.0")]
283#[derive(Debug, Clone, PartialEq, Eq)]
284pub struct InvalidHandleError(());
285
286#[stable(feature = "io_safety", since = "1.63.0")]
287impl fmt::Display for InvalidHandleError {
288    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
289        "A HandleOrInvalid could not be converted to a handle because it was INVALID_HANDLE_VALUE"
290            .fmt(fmt)
291    }
292}
293
294#[stable(feature = "io_safety", since = "1.63.0")]
295impl crate::error::Error for InvalidHandleError {}
296
297#[stable(feature = "io_safety", since = "1.63.0")]
298impl AsRawHandle for BorrowedHandle<'_> {
299    #[inline]
300    fn as_raw_handle(&self) -> RawHandle {
301        self.handle
302    }
303}
304
305#[stable(feature = "io_safety", since = "1.63.0")]
306impl AsRawHandle for OwnedHandle {
307    #[inline]
308    fn as_raw_handle(&self) -> RawHandle {
309        self.handle
310    }
311}
312
313#[stable(feature = "io_safety", since = "1.63.0")]
314impl IntoRawHandle for OwnedHandle {
315    #[inline]
316    fn into_raw_handle(self) -> RawHandle {
317        ManuallyDrop::new(self).handle
318    }
319}
320
321#[stable(feature = "io_safety", since = "1.63.0")]
322impl FromRawHandle for OwnedHandle {
323    #[inline]
324    unsafe fn from_raw_handle(handle: RawHandle) -> Self {
325        Self { handle }
326    }
327}
328
329impl HandleOrNull {
330    /// Constructs a new instance of `Self` from the given `RawHandle` returned
331    /// from a Windows API that uses null to indicate failure, such as
332    /// `CreateThread`.
333    ///
334    /// Use `HandleOrInvalid` instead of `HandleOrNull` for APIs that
335    /// use `INVALID_HANDLE_VALUE` to indicate failure.
336    ///
337    /// # Safety
338    ///
339    /// The passed `handle` value must either satisfy the safety requirements
340    /// of [`FromRawHandle::from_raw_handle`], or be null. Note that not all
341    /// Windows APIs use null for errors; see [here] for the full story.
342    ///
343    /// [here]: https://devblogs.microsoft.com/oldnewthing/20040302-00/?p=40443
344    #[stable(feature = "io_safety", since = "1.63.0")]
345    #[inline]
346    pub unsafe fn from_raw_handle(handle: RawHandle) -> Self {
347        Self(handle)
348    }
349
350    fn is_valid(&self) -> bool {
351        !self.0.is_null()
352    }
353}
354
355impl HandleOrInvalid {
356    /// Constructs a new instance of `Self` from the given `RawHandle` returned
357    /// from a Windows API that uses `INVALID_HANDLE_VALUE` to indicate
358    /// failure, such as `CreateFileW`.
359    ///
360    /// Use `HandleOrNull` instead of `HandleOrInvalid` for APIs that
361    /// use null to indicate failure.
362    ///
363    /// # Safety
364    ///
365    /// The passed `handle` value must either satisfy the safety requirements
366    /// of [`FromRawHandle::from_raw_handle`], or be
367    /// `INVALID_HANDLE_VALUE` (-1). Note that not all Windows APIs use
368    /// `INVALID_HANDLE_VALUE` for errors; see [here] for the full story.
369    ///
370    /// [here]: https://devblogs.microsoft.com/oldnewthing/20040302-00/?p=40443
371    #[stable(feature = "io_safety", since = "1.63.0")]
372    #[inline]
373    pub unsafe fn from_raw_handle(handle: RawHandle) -> Self {
374        Self(handle)
375    }
376
377    fn is_valid(&self) -> bool {
378        self.0 != sys::c::INVALID_HANDLE_VALUE
379    }
380}
381
382#[stable(feature = "io_safety", since = "1.63.0")]
383impl Drop for OwnedHandle {
384    #[inline]
385    fn drop(&mut self) {
386        unsafe {
387            let _ = sys::c::CloseHandle(self.handle);
388        }
389    }
390}
391
392#[stable(feature = "io_safety", since = "1.63.0")]
393impl fmt::Debug for BorrowedHandle<'_> {
394    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
395        f.debug_struct("BorrowedHandle").field("handle", &self.handle).finish()
396    }
397}
398
399#[stable(feature = "io_safety", since = "1.63.0")]
400impl fmt::Debug for OwnedHandle {
401    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
402        f.debug_struct("OwnedHandle").field("handle", &self.handle).finish()
403    }
404}
405
406macro_rules! impl_is_terminal {
407    ($($t:ty),*$(,)?) => {$(
408        #[stable(feature = "is_terminal", since = "1.70.0")]
409        impl io::IsTerminal for $t {
410            #[inline]
411            fn is_terminal(&self) -> bool {
412                crate::sys::io::is_terminal(self)
413            }
414        }
415    )*}
416}
417
418impl_is_terminal!(BorrowedHandle<'_>, OwnedHandle);
419
420/// A trait to borrow the handle from an underlying object.
421#[stable(feature = "io_safety", since = "1.63.0")]
422pub trait AsHandle {
423    /// Borrows the handle.
424    ///
425    /// # Example
426    ///
427    /// ```rust,no_run
428    /// use std::fs::File;
429    /// # use std::io;
430    /// use std::os::windows::io::{AsHandle, BorrowedHandle};
431    ///
432    /// let mut f = File::open("foo.txt")?;
433    /// let borrowed_handle: BorrowedHandle<'_> = f.as_handle();
434    /// # Ok::<(), io::Error>(())
435    /// ```
436    #[stable(feature = "io_safety", since = "1.63.0")]
437    fn as_handle(&self) -> BorrowedHandle<'_>;
438}
439
440#[stable(feature = "io_safety", since = "1.63.0")]
441impl<T: AsHandle + ?Sized> AsHandle for &T {
442    #[inline]
443    fn as_handle(&self) -> BorrowedHandle<'_> {
444        T::as_handle(self)
445    }
446}
447
448#[stable(feature = "io_safety", since = "1.63.0")]
449impl<T: AsHandle + ?Sized> AsHandle for &mut T {
450    #[inline]
451    fn as_handle(&self) -> BorrowedHandle<'_> {
452        T::as_handle(self)
453    }
454}
455
456#[stable(feature = "as_windows_ptrs", since = "1.71.0")]
457/// This impl allows implementing traits that require `AsHandle` on Arc.
458/// ```
459/// # #[cfg(windows)] mod group_cfg {
460/// # use std::os::windows::io::AsHandle;
461/// use std::fs::File;
462/// use std::sync::Arc;
463///
464/// trait MyTrait: AsHandle {}
465/// impl MyTrait for Arc<File> {}
466/// impl MyTrait for Box<File> {}
467/// # }
468/// ```
469impl<T: AsHandle + ?Sized> AsHandle for crate::sync::Arc<T> {
470    #[inline]
471    fn as_handle(&self) -> BorrowedHandle<'_> {
472        (**self).as_handle()
473    }
474}
475
476#[stable(feature = "as_windows_ptrs", since = "1.71.0")]
477impl<T: AsHandle + ?Sized> AsHandle for crate::rc::Rc<T> {
478    #[inline]
479    fn as_handle(&self) -> BorrowedHandle<'_> {
480        (**self).as_handle()
481    }
482}
483
484#[unstable(feature = "unique_rc_arc", issue = "112566")]
485impl<T: AsHandle + ?Sized> AsHandle for crate::rc::UniqueRc<T> {
486    #[inline]
487    fn as_handle(&self) -> BorrowedHandle<'_> {
488        (**self).as_handle()
489    }
490}
491
492#[stable(feature = "as_windows_ptrs", since = "1.71.0")]
493impl<T: AsHandle + ?Sized> AsHandle for Box<T> {
494    #[inline]
495    fn as_handle(&self) -> BorrowedHandle<'_> {
496        (**self).as_handle()
497    }
498}
499
500#[stable(feature = "io_safety", since = "1.63.0")]
501impl AsHandle for BorrowedHandle<'_> {
502    #[inline]
503    fn as_handle(&self) -> BorrowedHandle<'_> {
504        *self
505    }
506}
507
508#[stable(feature = "io_safety", since = "1.63.0")]
509impl AsHandle for OwnedHandle {
510    #[inline]
511    fn as_handle(&self) -> BorrowedHandle<'_> {
512        // Safety: `OwnedHandle` and `BorrowedHandle` have the same validity
513        // invariants, and the `BorrowedHandle` is bounded by the lifetime
514        // of `&self`.
515        unsafe { BorrowedHandle::borrow_raw(self.as_raw_handle()) }
516    }
517}
518
519#[stable(feature = "io_safety", since = "1.63.0")]
520impl AsHandle for fs::File {
521    #[inline]
522    fn as_handle(&self) -> BorrowedHandle<'_> {
523        self.as_inner().as_handle()
524    }
525}
526
527#[stable(feature = "io_safety", since = "1.63.0")]
528impl From<fs::File> for OwnedHandle {
529    /// Takes ownership of a [`File`](fs::File)'s underlying file handle.
530    #[inline]
531    fn from(file: fs::File) -> OwnedHandle {
532        file.into_inner().into_inner().into_inner()
533    }
534}
535
536#[stable(feature = "io_safety", since = "1.63.0")]
537impl From<OwnedHandle> for fs::File {
538    /// Returns a [`File`](fs::File) that takes ownership of the given handle.
539    #[inline]
540    fn from(owned: OwnedHandle) -> Self {
541        Self::from_inner(FromInner::from_inner(FromInner::from_inner(owned)))
542    }
543}
544
545#[stable(feature = "io_safety", since = "1.63.0")]
546impl AsHandle for io::Stdin {
547    #[inline]
548    fn as_handle(&self) -> BorrowedHandle<'_> {
549        unsafe { BorrowedHandle::borrow_raw(self.as_raw_handle()) }
550    }
551}
552
553#[stable(feature = "io_safety", since = "1.63.0")]
554impl<'a> AsHandle for io::StdinLock<'a> {
555    #[inline]
556    fn as_handle(&self) -> BorrowedHandle<'_> {
557        unsafe { BorrowedHandle::borrow_raw(self.as_raw_handle()) }
558    }
559}
560
561#[stable(feature = "io_safety", since = "1.63.0")]
562impl AsHandle for io::Stdout {
563    #[inline]
564    fn as_handle(&self) -> BorrowedHandle<'_> {
565        unsafe { BorrowedHandle::borrow_raw(self.as_raw_handle()) }
566    }
567}
568
569#[stable(feature = "io_safety", since = "1.63.0")]
570impl<'a> AsHandle for io::StdoutLock<'a> {
571    #[inline]
572    fn as_handle(&self) -> BorrowedHandle<'_> {
573        unsafe { BorrowedHandle::borrow_raw(self.as_raw_handle()) }
574    }
575}
576
577#[stable(feature = "io_safety", since = "1.63.0")]
578impl AsHandle for io::Stderr {
579    #[inline]
580    fn as_handle(&self) -> BorrowedHandle<'_> {
581        unsafe { BorrowedHandle::borrow_raw(self.as_raw_handle()) }
582    }
583}
584
585#[stable(feature = "io_safety", since = "1.63.0")]
586impl<'a> AsHandle for io::StderrLock<'a> {
587    #[inline]
588    fn as_handle(&self) -> BorrowedHandle<'_> {
589        unsafe { BorrowedHandle::borrow_raw(self.as_raw_handle()) }
590    }
591}
592
593#[stable(feature = "io_safety", since = "1.63.0")]
594impl AsHandle for crate::process::ChildStdin {
595    #[inline]
596    fn as_handle(&self) -> BorrowedHandle<'_> {
597        unsafe { BorrowedHandle::borrow_raw(self.as_raw_handle()) }
598    }
599}
600
601#[stable(feature = "io_safety", since = "1.63.0")]
602impl From<crate::process::ChildStdin> for OwnedHandle {
603    /// Takes ownership of a [`ChildStdin`](crate::process::ChildStdin)'s file handle.
604    #[inline]
605    fn from(child_stdin: crate::process::ChildStdin) -> OwnedHandle {
606        unsafe { OwnedHandle::from_raw_handle(child_stdin.into_raw_handle()) }
607    }
608}
609
610#[stable(feature = "io_safety", since = "1.63.0")]
611impl AsHandle for crate::process::ChildStdout {
612    #[inline]
613    fn as_handle(&self) -> BorrowedHandle<'_> {
614        unsafe { BorrowedHandle::borrow_raw(self.as_raw_handle()) }
615    }
616}
617
618#[stable(feature = "io_safety", since = "1.63.0")]
619impl From<crate::process::ChildStdout> for OwnedHandle {
620    /// Takes ownership of a [`ChildStdout`](crate::process::ChildStdout)'s file handle.
621    #[inline]
622    fn from(child_stdout: crate::process::ChildStdout) -> OwnedHandle {
623        unsafe { OwnedHandle::from_raw_handle(child_stdout.into_raw_handle()) }
624    }
625}
626
627#[stable(feature = "io_safety", since = "1.63.0")]
628impl AsHandle for crate::process::ChildStderr {
629    #[inline]
630    fn as_handle(&self) -> BorrowedHandle<'_> {
631        unsafe { BorrowedHandle::borrow_raw(self.as_raw_handle()) }
632    }
633}
634
635#[stable(feature = "io_safety", since = "1.63.0")]
636impl From<crate::process::ChildStderr> for OwnedHandle {
637    /// Takes ownership of a [`ChildStderr`](crate::process::ChildStderr)'s file handle.
638    #[inline]
639    fn from(child_stderr: crate::process::ChildStderr) -> OwnedHandle {
640        unsafe { OwnedHandle::from_raw_handle(child_stderr.into_raw_handle()) }
641    }
642}
643
644#[stable(feature = "io_safety", since = "1.63.0")]
645impl<T> AsHandle for crate::thread::JoinHandle<T> {
646    #[inline]
647    fn as_handle(&self) -> BorrowedHandle<'_> {
648        unsafe { BorrowedHandle::borrow_raw(self.as_raw_handle()) }
649    }
650}
651
652#[stable(feature = "io_safety", since = "1.63.0")]
653impl<T> From<crate::thread::JoinHandle<T>> for OwnedHandle {
654    #[inline]
655    fn from(join_handle: crate::thread::JoinHandle<T>) -> OwnedHandle {
656        join_handle.into_inner().into_handle().into_inner()
657    }
658}
659
660#[stable(feature = "anonymous_pipe", since = "1.87.0")]
661impl AsHandle for io::PipeReader {
662    fn as_handle(&self) -> BorrowedHandle<'_> {
663        self.0.as_handle()
664    }
665}
666
667#[stable(feature = "anonymous_pipe", since = "1.87.0")]
668impl From<io::PipeReader> for OwnedHandle {
669    fn from(pipe: io::PipeReader) -> Self {
670        pipe.into_inner().into_inner()
671    }
672}
673
674#[stable(feature = "anonymous_pipe", since = "1.87.0")]
675impl AsHandle for io::PipeWriter {
676    fn as_handle(&self) -> BorrowedHandle<'_> {
677        self.0.as_handle()
678    }
679}
680
681#[stable(feature = "anonymous_pipe", since = "1.87.0")]
682impl From<io::PipeWriter> for OwnedHandle {
683    fn from(pipe: io::PipeWriter) -> Self {
684        pipe.into_inner().into_inner()
685    }
686}
687
688#[stable(feature = "anonymous_pipe", since = "1.87.0")]
689impl From<OwnedHandle> for io::PipeReader {
690    fn from(owned_handle: OwnedHandle) -> Self {
691        Self::from_inner(FromInner::from_inner(owned_handle))
692    }
693}
694
695#[stable(feature = "anonymous_pipe", since = "1.87.0")]
696impl From<OwnedHandle> for io::PipeWriter {
697    fn from(owned_handle: OwnedHandle) -> Self {
698        Self::from_inner(FromInner::from_inner(owned_handle))
699    }
700}
std/os/windows/io/handle.rs

std/os/windows/io/
handle.rs
