move IO traits to std/src/os/hermit

By moving the IO traits, the RustyHermit support is harmonized to
of other operating systems.

Author: stlankes

library/std/src/os/hermit/io.rs

@@ -0,0 +1,10 @@
+#![stable(feature = "os_fd", since = "1.66.0")]
+
+mod owned;
+mod raw;
+
+// Export the types and traits for the public API.
+#[stable(feature = "os_fd", since = "1.66.0")]
+pub use owned::*;
+#[stable(feature = "os_fd", since = "1.66.0")]
+pub use raw::*;

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

@@ -1,9 +1,8 @@
-use super::raw::RawFd;
-
+use super::raw::{AsRawFd, FromRawFd, IntoRawFd, RawFd};
+use crate::fmt;
 use crate::marker::PhantomData;
 use crate::mem::forget;
-use crate::sys::fd::{AsRawFd, FromRawFd, IntoRawFd};
-use crate::sys::hermit::abi;
+use crate::os::hermit::abi;
 use crate::sys_common::{AsInner, FromInner, IntoInner};
 
 /// A borrowed file descriptor.
@@ -49,7 +48,6 @@ pub struct BorrowedFd<'fd> {
 #[rustc_layout_scalar_valid_range_end(0xFF_FF_FF_FE)]
 #[rustc_nonnull_optimization_guaranteed]
 #[stable(feature = "io_safety", since = "1.63.0")]
-#[derive(Debug)]
 pub struct OwnedFd {
     fd: RawFd,
 }
@@ -71,6 +69,35 @@ impl BorrowedFd<'_> {
     }
 }
 
+#[stable(feature = "io_safety", since = "1.63.0")]
+impl Drop for OwnedFd {
+    #[inline]
+    fn drop(&mut self) {
+        unsafe {
+            // Note that errors are ignored when closing a file descriptor. The
+            // reason for this is that if an error occurs we don't actually know if
+            // the file descriptor was closed or not, and if we retried (for
+            // something like EINTR), we might close another valid file descriptor
+            // opened after we closed ours.
+            let _ = abi::close(self.fd);
+        }
+    }
+}
+
+#[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()
+    }
+}
+
+#[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()
+    }
+}
+
 #[stable(feature = "io_safety", since = "1.63.0")]
 impl AsRawFd for BorrowedFd<'_> {
     #[inline]
@@ -113,14 +140,6 @@ impl FromRawFd for OwnedFd {
     }
 }
 
-#[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()
-    }
-}
-
 #[stable(feature = "io_safety", since = "1.63.0")]
 impl From<crate::net::TcpStream> for OwnedFd {
     #[inline]
@@ -139,14 +158,6 @@ impl From<OwnedFd> for crate::net::TcpStream {
     }
 }
 
-#[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()
-    }
-}
-
 #[stable(feature = "io_safety", since = "1.63.0")]
 impl From<crate::net::TcpListener> for OwnedFd {
     #[inline]
@@ -165,14 +176,6 @@ impl From<OwnedFd> for crate::net::TcpListener {
     }
 }
 
-#[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()
-    }
-}
-
 #[stable(feature = "io_safety", since = "1.63.0")]
 impl From<crate::net::UdpSocket> for OwnedFd {
     #[inline]
@@ -191,21 +194,8 @@ impl From<OwnedFd> for crate::net::UdpSocket {
     }
 }
 
+/// A trait to borrow the file descriptor from an underlying object.
 #[stable(feature = "io_safety", since = "1.63.0")]
-impl Drop for OwnedFd {
-    #[inline]
-    fn drop(&mut self) {
-        unsafe {
-            // Note that errors are ignored when closing a file descriptor. The
-            // reason for this is that if an error occurs we don't actually know if
-            // the file descriptor was closed or not, and if we retried (for
-            // something like EINTR), we might close another valid file descriptor
-            // opened after we closed ours.
-            let _ = abi::close(self.fd);
-        }
-    }
-}
-
 pub trait AsFd {
     /// Borrows the file descriptor.
     ///
@@ -226,6 +216,22 @@ pub trait AsFd {
     fn as_fd(&self) -> BorrowedFd<'_>;
 }
 
+#[stable(feature = "io_safety", since = "1.63.0")]
+impl<T: AsFd> AsFd for &T {
+    #[inline]
+    fn as_fd(&self) -> BorrowedFd<'_> {
+        T::as_fd(self)
+    }
+}
+
+#[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)
+    }
+}
+
 #[stable(feature = "io_safety", since = "1.63.0")]
 impl AsFd for OwnedFd {
     #[inline]
@@ -236,3 +242,27 @@ impl AsFd for OwnedFd {
         unsafe { BorrowedFd::borrow_raw(self.as_raw_fd()) }
     }
 }
+
+#[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()
+    }
+}
+
+#[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()
+    }
+}
+
+#[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()
+    }
+}

library/std/src/sys/hermit/fd/owned.rs renamed to library/std/src/os/hermit/io/owned.rs

@@ -1,6 +1,11 @@
 #![stable(feature = "rust1", since = "1.0.0")]
 
+#[allow(unused_extern_crates)]
+#[stable(feature = "rust1", since = "1.0.0")]
+pub extern crate hermit_abi as abi;
+
 pub mod ffi;
+pub mod io;
 
 /// A prelude for conveniently writing platform-specific code.
 ///

library/std/src/sys/hermit/fd/raw.rs renamed to library/std/src/os/hermit/io/raw.rs

@@ -60,16 +60,6 @@ pub mod windows {}
         all(target_vendor = "fortanix", target_env = "sgx")
     )
 )))]
-#[cfg(target_os = "hermit")]
-#[path = "hermit/mod.rs"]
-pub mod unix;
-#[cfg(not(all(
-    doc,
-    any(
-        all(target_arch = "wasm32", not(target_os = "wasi")),
-        all(target_vendor = "fortanix", target_env = "sgx")
-    )
-)))]
 #[cfg(all(not(target_os = "hermit"), any(unix, doc)))]
 pub mod unix;
 
@@ -123,6 +113,8 @@ pub mod freebsd;
 pub mod fuchsia;
 #[cfg(target_os = "haiku")]
 pub mod haiku;
+#[cfg(target_os = "hermit")]
+pub mod hermit;
 #[cfg(target_os = "horizon")]
 pub mod horizon;
 #[cfg(target_os = "illumos")]

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

@@ -1,6 +1,6 @@
 use crate::ffi::{c_char, CStr, OsString};
 use crate::fmt;
-use crate::os::unix::ffi::OsStringExt;
+use crate::os::hermit::ffi::OsStringExt;
 use crate::ptr;
 use crate::sync::atomic::{
     AtomicIsize, AtomicPtr,

library/std/src/os/mod.rs

@@ -1,16 +1,13 @@
 #![unstable(reason = "not public", issue = "none", feature = "fd")]
 
-mod owned;
-mod raw;
-
 use crate::io::{self, Read};
+use crate::os::hermit::io::{FromRawFd, OwnedFd, RawFd};
 use crate::sys::cvt;
 use crate::sys::hermit::abi;
 use crate::sys::unsupported;
 use crate::sys_common::{AsInner, FromInner, IntoInner};
 
-pub use self::owned::*;
-pub use self::raw::*;
+use crate::os::hermit::io::*;
 
 #[derive(Debug)]
 pub struct FileDesc {

library/std/src/sys/hermit/args.rs

@@ -3,12 +3,14 @@ use crate::fmt;
 use crate::hash::{Hash, Hasher};
 use crate::io::{self, Error, ErrorKind};
 use crate::io::{BorrowedCursor, IoSlice, IoSliceMut, SeekFrom};
+use crate::os::hermit::io::FromRawFd;
 use crate::path::{Path, PathBuf};
 use crate::sys::common::small_c_string::run_path_with_cstr;
 use crate::sys::cvt;
-use crate::sys::hermit::abi;
-use crate::sys::hermit::abi::{O_APPEND, O_CREAT, O_EXCL, O_RDONLY, O_RDWR, O_TRUNC, O_WRONLY};
-use crate::sys::hermit::fd::{FileDesc, FromRawFd};
+use crate::sys::hermit::abi::{
+    self, O_APPEND, O_CREAT, O_EXCL, O_RDONLY, O_RDWR, O_TRUNC, O_WRONLY,
+};
+use crate::sys::hermit::fd::FileDesc;
 use crate::sys::time::SystemTime;
 use crate::sys::unsupported;
 

library/std/src/sys/hermit/fd/mod.rs renamed to library/std/src/sys/hermit/fd.rs

@@ -57,9 +57,7 @@ pub mod locks {
 }
 
 use crate::io::ErrorKind;
-
-#[allow(unused_extern_crates)]
-pub extern crate hermit_abi as abi;
+use crate::os::hermit::abi;
 
 pub fn unsupported<T>() -> crate::io::Result<T> {
     Err(unsupported_err())