Rollup merge of #95118 - sunfishcode:sunfishcode/stabilize-io-safety, r=joshtriplett

Implement stabilization of `#[feature(io_safety)]`.

Implement stabilization of [I/O safety], aka `#[feature(io_safety)]`.

Fixes #87074.

[I/O safety]: https://github.com/rust-lang/rfcs/blob/master/text/3128-io-safety.md

Author: JohnTitor

library/std/src/os/fd/mod.rs

@@ -1,6 +1,6 @@
 //! Owned and borrowed Unix-like file descriptors.
 
-#![unstable(feature = "io_safety", issue = "87074")]
+#![stable(feature = "io_safety", since = "1.63.0")]
 #![deny(unsafe_op_in_unsafe_fn)]
 
 // `RawFd`, `AsRawFd`, etc.

library/std/src/os/fd/owned.rs

@@ -1,6 +1,6 @@
 //! Owned and borrowed Unix-like file descriptors.
 
-#![unstable(feature = "io_safety", issue = "87074")]
+#![stable(feature = "io_safety", since = "1.63.0")]
 #![deny(unsafe_op_in_unsafe_fn)]
 
 use super::raw::{AsRawFd, FromRawFd, IntoRawFd, RawFd};
@@ -33,7 +33,7 @@ use crate::sys_common::{AsInner, FromInner, IntoInner};
 // because c_int is 32 bits.
 #[rustc_layout_scalar_valid_range_end(0xFF_FF_FF_FE)]
 #[rustc_nonnull_optimization_guaranteed]
-#[unstable(feature = "io_safety", issue = "87074")]
+#[stable(feature = "io_safety", since = "1.63.0")]
 pub struct BorrowedFd<'fd> {
     fd: RawFd,
     _phantom: PhantomData<&'fd OwnedFd>,
@@ -54,7 +54,7 @@ pub struct BorrowedFd<'fd> {
 // because c_int is 32 bits.
 #[rustc_layout_scalar_valid_range_end(0xFF_FF_FF_FE)]
 #[rustc_nonnull_optimization_guaranteed]
-#[unstable(feature = "io_safety", issue = "87074")]
+#[stable(feature = "io_safety", since = "1.63.0")]
 pub struct OwnedFd {
     fd: RawFd,
 }
@@ -67,7 +67,8 @@ impl BorrowedFd<'_> {
     /// The resource pointed to by `fd` must remain open for the duration of
     /// the returned `BorrowedFd`, and it must not have the value `-1`.
     #[inline]
-    #[unstable(feature = "io_safety", issue = "87074")]
+    #[rustc_const_stable(feature = "io_safety", since = "1.63.0")]
+    #[stable(feature = "io_safety", since = "1.63.0")]
     pub const unsafe fn borrow_raw(fd: RawFd) -> Self {
         assert!(fd != u32::MAX as RawFd);
         // SAFETY: we just asserted that the value is in the valid range and isn't `-1` (the only value bigger than `0xFF_FF_FF_FE` unsigned)
@@ -79,6 +80,7 @@ impl OwnedFd {
     /// Creates a new `OwnedFd` instance that shares the same underlying file handle
     /// as the existing `OwnedFd` instance.
     #[cfg(not(target_arch = "wasm32"))]
+    #[stable(feature = "io_safety", since = "1.63.0")]
     pub fn try_clone(&self) -> crate::io::Result<Self> {
         // We want to atomically duplicate this file descriptor and set the
         // CLOEXEC flag, and currently that's done via F_DUPFD_CLOEXEC. This
@@ -98,6 +100,7 @@ impl OwnedFd {
     }
 
     #[cfg(target_arch = "wasm32")]
+    #[stable(feature = "io_safety", since = "1.63.0")]
     pub fn try_clone(&self) -> crate::io::Result<Self> {
         Err(crate::io::const_io_error!(
             crate::io::ErrorKind::Unsupported,
@@ -106,23 +109,23 @@ impl OwnedFd {
     }
 }
 
-#[unstable(feature = "io_safety", issue = "87074")]
+#[stable(feature = "io_safety", since = "1.63.0")]
 impl AsRawFd for BorrowedFd<'_> {
     #[inline]
     fn as_raw_fd(&self) -> RawFd {
         self.fd
     }
 }
 
-#[unstable(feature = "io_safety", issue = "87074")]
+#[stable(feature = "io_safety", since = "1.63.0")]
 impl AsRawFd for OwnedFd {
     #[inline]
     fn as_raw_fd(&self) -> RawFd {
         self.fd
     }
 }
 
-#[unstable(feature = "io_safety", issue = "87074")]
+#[stable(feature = "io_safety", since = "1.63.0")]
 impl IntoRawFd for OwnedFd {
     #[inline]
     fn into_raw_fd(self) -> RawFd {
@@ -132,7 +135,7 @@ impl IntoRawFd for OwnedFd {
     }
 }
 
-#[unstable(feature = "io_safety", issue = "87074")]
+#[stable(feature = "io_safety", since = "1.63.0")]
 impl FromRawFd for OwnedFd {
     /// Constructs a new instance of `Self` from the given raw file descriptor.
     ///
@@ -148,7 +151,7 @@ impl FromRawFd for OwnedFd {
     }
 }
 
-#[unstable(feature = "io_safety", issue = "87074")]
+#[stable(feature = "io_safety", since = "1.63.0")]
 impl Drop for OwnedFd {
     #[inline]
     fn drop(&mut self) {
@@ -163,14 +166,14 @@ impl Drop for OwnedFd {
     }
 }
 
-#[unstable(feature = "io_safety", issue = "87074")]
+#[stable(feature = "io_safety", since = "1.63.0")]
 impl fmt::Debug for BorrowedFd<'_> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         f.debug_struct("BorrowedFd").field("fd", &self.fd).finish()
     }
 }
 
-#[unstable(feature = "io_safety", issue = "87074")]
+#[stable(feature = "io_safety", since = "1.63.0")]
 impl fmt::Debug for OwnedFd {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         f.debug_struct("OwnedFd").field("fd", &self.fd).finish()
@@ -182,14 +185,13 @@ impl fmt::Debug for OwnedFd {
 /// This is only available on unix platforms and must be imported in order to
 /// call the method. Windows platforms have a corresponding `AsHandle` and
 /// `AsSocket` set of traits.
-#[unstable(feature = "io_safety", issue = "87074")]
+#[stable(feature = "io_safety", since = "1.63.0")]
 pub trait AsFd {
     /// Borrows the file descriptor.
     ///
     /// # Example
     ///
     /// ```rust,no_run
-    /// # #![feature(io_safety)]
     /// use std::fs::File;
     /// # use std::io;
     /// # #[cfg(target_os = "wasi")]
@@ -202,35 +204,35 @@ pub trait AsFd {
     /// let borrowed_fd: BorrowedFd<'_> = f.as_fd();
     /// # Ok::<(), io::Error>(())
     /// ```
-    #[unstable(feature = "io_safety", issue = "87074")]
+    #[stable(feature = "io_safety", since = "1.63.0")]
     fn as_fd(&self) -> BorrowedFd<'_>;
 }
 
-#[unstable(feature = "io_safety", issue = "87074")]
+#[stable(feature = "io_safety", since = "1.63.0")]
 impl<T: AsFd> AsFd for &T {
     #[inline]
     fn as_fd(&self) -> BorrowedFd<'_> {
         T::as_fd(self)
     }
 }
 
-#[unstable(feature = "io_safety", issue = "87074")]
+#[stable(feature = "io_safety", since = "1.63.0")]
 impl<T: AsFd> AsFd for &mut T {
     #[inline]
     fn as_fd(&self) -> BorrowedFd<'_> {
         T::as_fd(self)
     }
 }
 
-#[unstable(feature = "io_safety", issue = "87074")]
+#[stable(feature = "io_safety", since = "1.63.0")]
 impl AsFd for BorrowedFd<'_> {
     #[inline]
     fn as_fd(&self) -> BorrowedFd<'_> {
         *self
     }
 }
 
-#[unstable(feature = "io_safety", issue = "87074")]
+#[stable(feature = "io_safety", since = "1.63.0")]
 impl AsFd for OwnedFd {
     #[inline]
     fn as_fd(&self) -> BorrowedFd<'_> {
@@ -241,47 +243,47 @@ impl AsFd for OwnedFd {
     }
 }
 
-#[unstable(feature = "io_safety", issue = "87074")]
+#[stable(feature = "io_safety", since = "1.63.0")]
 impl AsFd for fs::File {
     #[inline]
     fn as_fd(&self) -> BorrowedFd<'_> {
         self.as_inner().as_fd()
     }
 }
 
-#[unstable(feature = "io_safety", issue = "87074")]
+#[stable(feature = "io_safety", since = "1.63.0")]
 impl From<fs::File> for OwnedFd {
     #[inline]
     fn from(file: fs::File) -> OwnedFd {
         file.into_inner().into_inner().into_inner()
     }
 }
 
-#[unstable(feature = "io_safety", issue = "87074")]
+#[stable(feature = "io_safety", since = "1.63.0")]
 impl From<OwnedFd> for fs::File {
     #[inline]
     fn from(owned_fd: OwnedFd) -> Self {
         Self::from_inner(FromInner::from_inner(FromInner::from_inner(owned_fd)))
     }
 }
 
-#[unstable(feature = "io_safety", issue = "87074")]
+#[stable(feature = "io_safety", since = "1.63.0")]
 impl AsFd for crate::net::TcpStream {
     #[inline]
     fn as_fd(&self) -> BorrowedFd<'_> {
         self.as_inner().socket().as_fd()
     }
 }
 
-#[unstable(feature = "io_safety", issue = "87074")]
+#[stable(feature = "io_safety", since = "1.63.0")]
 impl From<crate::net::TcpStream> for OwnedFd {
     #[inline]
     fn from(tcp_stream: crate::net::TcpStream) -> OwnedFd {
         tcp_stream.into_inner().into_socket().into_inner().into_inner().into()
     }
 }
 
-#[unstable(feature = "io_safety", issue = "87074")]
+#[stable(feature = "io_safety", since = "1.63.0")]
 impl From<OwnedFd> for crate::net::TcpStream {
     #[inline]
     fn from(owned_fd: OwnedFd) -> Self {
@@ -291,23 +293,23 @@ impl From<OwnedFd> for crate::net::TcpStream {
     }
 }
 
-#[unstable(feature = "io_safety", issue = "87074")]
+#[stable(feature = "io_safety", since = "1.63.0")]
 impl AsFd for crate::net::TcpListener {
     #[inline]
     fn as_fd(&self) -> BorrowedFd<'_> {
         self.as_inner().socket().as_fd()
     }
 }
 
-#[unstable(feature = "io_safety", issue = "87074")]
+#[stable(feature = "io_safety", since = "1.63.0")]
 impl From<crate::net::TcpListener> for OwnedFd {
     #[inline]
     fn from(tcp_listener: crate::net::TcpListener) -> OwnedFd {
         tcp_listener.into_inner().into_socket().into_inner().into_inner().into()
     }
 }
 
-#[unstable(feature = "io_safety", issue = "87074")]
+#[stable(feature = "io_safety", since = "1.63.0")]
 impl From<OwnedFd> for crate::net::TcpListener {
     #[inline]
     fn from(owned_fd: OwnedFd) -> Self {
@@ -317,23 +319,23 @@ impl From<OwnedFd> for crate::net::TcpListener {
     }
 }
 
-#[unstable(feature = "io_safety", issue = "87074")]
+#[stable(feature = "io_safety", since = "1.63.0")]
 impl AsFd for crate::net::UdpSocket {
     #[inline]
     fn as_fd(&self) -> BorrowedFd<'_> {
         self.as_inner().socket().as_fd()
     }
 }
 
-#[unstable(feature = "io_safety", issue = "87074")]
+#[stable(feature = "io_safety", since = "1.63.0")]
 impl From<crate::net::UdpSocket> for OwnedFd {
     #[inline]
     fn from(udp_socket: crate::net::UdpSocket) -> OwnedFd {
         udp_socket.into_inner().into_socket().into_inner().into_inner().into()
     }
 }
 
-#[unstable(feature = "io_safety", issue = "87074")]
+#[stable(feature = "io_safety", since = "1.63.0")]
 impl From<OwnedFd> for crate::net::UdpSocket {
     #[inline]
     fn from(owned_fd: OwnedFd) -> Self {

library/std/src/os/unix/io/fd.rs

@@ -1,9 +1,8 @@
 //! Owned and borrowed file descriptors.
 
-#![unstable(feature = "io_safety", issue = "87074")]
-
 // Tests for this module
 #[cfg(test)]
 mod tests;
 
+#[stable(feature = "io_safety", since = "1.63.0")]
 pub use crate::os::fd::owned::*;

library/std/src/os/unix/io/mod.rs

@@ -51,7 +51,7 @@
 mod fd;
 mod raw;
 
-#[unstable(feature = "io_safety", issue = "87074")]
+#[stable(feature = "io_safety", since = "1.63.0")]
 pub use fd::*;
 #[stable(feature = "rust1", since = "1.0.0")]
 pub use raw::*;

library/std/src/os/unix/net/datagram.rs

@@ -962,23 +962,23 @@ impl IntoRawFd for UnixDatagram {
     }
 }
 
-#[unstable(feature = "io_safety", issue = "87074")]
+#[stable(feature = "io_safety", since = "1.63.0")]
 impl AsFd for UnixDatagram {
     #[inline]
     fn as_fd(&self) -> BorrowedFd<'_> {
         self.0.as_inner().as_fd()
     }
 }
 
-#[unstable(feature = "io_safety", issue = "87074")]
+#[stable(feature = "io_safety", since = "1.63.0")]
 impl From<UnixDatagram> for OwnedFd {
     #[inline]
     fn from(unix_datagram: UnixDatagram) -> OwnedFd {
         unsafe { OwnedFd::from_raw_fd(unix_datagram.into_raw_fd()) }
     }
 }
 
-#[unstable(feature = "io_safety", issue = "87074")]
+#[stable(feature = "io_safety", since = "1.63.0")]
 impl From<OwnedFd> for UnixDatagram {
     #[inline]
     fn from(owned: OwnedFd) -> Self {

library/std/src/os/unix/net/listener.rs

@@ -300,23 +300,23 @@ impl IntoRawFd for UnixListener {
     }
 }
 
-#[unstable(feature = "io_safety", issue = "87074")]
+#[stable(feature = "io_safety", since = "1.63.0")]
 impl AsFd for UnixListener {
     #[inline]
     fn as_fd(&self) -> BorrowedFd<'_> {
         self.0.as_inner().as_fd()
     }
 }
 
-#[unstable(feature = "io_safety", issue = "87074")]
+#[stable(feature = "io_safety", since = "1.63.0")]
 impl From<OwnedFd> for UnixListener {
     #[inline]
     fn from(fd: OwnedFd) -> UnixListener {
         UnixListener(Socket::from_inner(FromInner::from_inner(fd)))
     }
 }
 
-#[unstable(feature = "io_safety", issue = "87074")]
+#[stable(feature = "io_safety", since = "1.63.0")]
 impl From<UnixListener> for OwnedFd {
     #[inline]
     fn from(listener: UnixListener) -> OwnedFd {

library/std/src/os/unix/net/stream.rs

@@ -683,23 +683,23 @@ impl IntoRawFd for UnixStream {
     }
 }
 
-#[unstable(feature = "io_safety", issue = "87074")]
+#[stable(feature = "io_safety", since = "1.63.0")]
 impl AsFd for UnixStream {
     #[inline]
     fn as_fd(&self) -> BorrowedFd<'_> {
         self.0.as_fd()
     }
 }
 
-#[unstable(feature = "io_safety", issue = "87074")]
+#[stable(feature = "io_safety", since = "1.63.0")]
 impl From<UnixStream> for OwnedFd {
     #[inline]
     fn from(unix_stream: UnixStream) -> OwnedFd {
         unsafe { OwnedFd::from_raw_fd(unix_stream.into_raw_fd()) }
     }
 }
 
-#[unstable(feature = "io_safety", issue = "87074")]
+#[stable(feature = "io_safety", since = "1.63.0")]
 impl From<OwnedFd> for UnixStream {
     #[inline]
     fn from(owned: OwnedFd) -> Self {