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HandleOrNull can hold null, and HandleOrInvalid can hold INVALID_HANDLE_VALUE.

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This commit is contained in:
Dan Gohman 2022-05-11 06:36:54 -07:00
parent 0a39e5ad36
commit 2f75b4aaa6
1 changed files with 5 additions and 9 deletions
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14
library/std/src/os/windows/io/handle.rs
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@ -77,9 +77,9 @@ pub struct OwnedHandle {
/// `NULL`. This ensures that such FFI calls cannot start using the handle without
/// checking for `NULL` first.
///
/// This type may hold any handle value that [`OwnedHandle`] may hold, except `NULL`. It may
/// hold `-1`, even though `-1` has the same value as `INVALID_HANDLE_VALUE`, because in
/// `HandleOrNull`, `-1` is interpreted to mean the current process handle.
/// This type may hold any handle value that [`OwnedHandle`] may hold. As with `OwnedHandle`, when
/// it holds `-1`, that value is interpreted as the current process handle, and not
/// `INVALID_HANDLE_VALUE`.
///
/// If this holds a non-null handle, it will close the handle on drop.
#[repr(transparent)]
@ -97,12 +97,8 @@ pub struct HandleOrNull(OwnedHandle);
/// `INVALID_HANDLE_VALUE`. This ensures that such FFI calls cannot start using the handle without
/// checking for `INVALID_HANDLE_VALUE` first.
///
/// This type may hold any handle value that [`OwnedHandle`] may hold, except `-1`. It must not
/// hold `-1`, because `-1` in `HandleOrInvalid` is interpreted to mean `INVALID_HANDLE_VALUE`.
///
/// This type may hold `NULL`, because APIs that use `INVALID_HANDLE_VALUE` as their sentry value
/// may return `NULL` under `windows_subsystem = "windows"` or other situations where I/O devices
/// are detached.
/// This type may hold any handle value that [`OwnedHandle`] may hold, except that when it holds
/// `-1`, that value is interpreted to mean `INVALID_HANDLE_VALUE`.
///
/// If holds a handle other than `INVALID_HANDLE_VALUE`, it will close the handle on drop.
#[repr(transparent)]