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Rollup merge of #127077 - tbu-:pr_doc_fd_to_owned, r=workingjubilee

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Make language around `ToOwned` for `BorrowedFd` more precise
This commit is contained in:
Matthias Krüger 2024-07-18 08:08:58 +02:00 committed by GitHub
commit 3aafbd28e5
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1 changed files with 10 additions and 3 deletions
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13
library/std/src/os/fd/owned.rs
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@ -24,9 +24,14 @@ use crate::sys_common::{AsInner, FromInner, IntoInner};
/// passed as an argument, it is not captured or consumed, and it never has the
/// value `-1`.
///
/// This type's `.to_owned()` implementation returns another `BorrowedFd`
/// rather than an `OwnedFd`. It just makes a trivial copy of the raw file
/// descriptor, which is then borrowed under the same lifetime.
/// This type does not have a [`ToOwned`][crate::borrow::ToOwned]
/// implementation. Calling `.to_owned()` on a variable of this type will call
/// it on `&BorrowedFd` and use `Clone::clone()` like `ToOwned` does for all
/// types implementing `Clone`. The result will be descriptor borrowed under
/// the same lifetime.
///
/// To obtain an [`OwnedFd`], you can use [`BorrowedFd::try_clone_to_owned`]
/// instead, but this is not supported on all platforms.
#[derive(Copy, Clone)]
#[repr(transparent)]
#[rustc_layout_scalar_valid_range_start(0)]
@ -50,6 +55,8 @@ pub struct BorrowedFd<'fd> {
/// descriptor, so it can be used in FFI in places where a file descriptor is
/// passed as a consumed argument or returned as an owned value, and it never
/// has the value `-1`.
///
/// You can use [`AsFd::as_fd`] to obtain a [`BorrowedFd`].
#[repr(transparent)]
#[rustc_layout_scalar_valid_range_start(0)]
// libstd/os/raw/mod.rs assures me that every libstd-supported platform has a