Make `std::os::fd` public.

`std::os::fd` defines types like `OwnedFd` and `RawFd` and is common
between Unix and non-Unix platforms that share a basic file-descriptor
concept. Rust currently uses this internally to simplify its own code,
but it would be useful for external users in the same way, so make it
public.

This means that `OwnedFd` etc. will all appear in three places, for
example on unix platforms:
 - `std::os::fd::OwnedFd`
 - `std::os::unix::io::OwnedFd`
 - `std::os::unix::prelude::OwnedFd`

3 files changed, 16 insertions, 18 deletions

diff --git a/library/std/src/os/fd/mod.rs b/library/std/src/os/fd/mod.rs
index a456947534a..8043d1a53d2 100644
--- a/library/std/src/os/fd/mod.rs
+++ b/library/std/src/os/fd/mod.rs
@@ -1,16 +1,26 @@
 //! Owned and borrowed Unix-like file descriptors.
+//!
+//! This module is supported on Unix platforms, and also some non-Unix
+//! platforms which use a similar file descriptor system for referencing OS
+//! resources.
 
 #![stable(feature = "io_safety", since = "1.63.0")]
 #![deny(unsafe_op_in_unsafe_fn)]
 
 // `RawFd`, `AsRawFd`, etc.
-pub mod raw;
+mod raw;
 
 // `OwnedFd`, `AsFd`, etc.
-pub mod owned;
+mod owned;
 
 // Implementations for `AsRawFd` etc. for network types.
 mod net;
 
 #[cfg(test)]
 mod tests;
+
+// Export the types and traits for the public API.
+#[stable(feature = "io_safety", since = "1.63.0")]
+pub use owned::*;
+#[stable(feature = "rust1", since = "1.0.0")]
+pub use raw::*;
diff --git a/library/std/src/os/fd/owned.rs b/library/std/src/os/fd/owned.rs
index a463bc41db7..3a1b04a83fa 100644
--- a/library/std/src/os/fd/owned.rs
+++ b/library/std/src/os/fd/owned.rs
@@ -205,10 +205,7 @@ pub trait AsFd {
     /// ```rust,no_run
     /// use std::fs::File;
     /// # use std::io;
-    /// # #[cfg(target_os = "wasi")]
-    /// # use std::os::wasi::io::{AsFd, BorrowedFd};
-    /// # #[cfg(unix)]
-    /// # use std::os::unix::io::{AsFd, BorrowedFd};
+    /// # use std::os::fd::{AsFd, BorrowedFd};
     ///
     /// let mut f = File::open("foo.txt")?;
     /// # #[cfg(any(unix, target_os = "wasi"))]
diff --git a/library/std/src/os/fd/raw.rs b/library/std/src/os/fd/raw.rs
index 1b3d110426f..42a9effcf92 100644
--- a/library/std/src/os/fd/raw.rs
+++ b/library/std/src/os/fd/raw.rs
@@ -42,10 +42,7 @@ pub trait AsRawFd {
     /// ```no_run
     /// use std::fs::File;
     /// # use std::io;
-    /// #[cfg(unix)]
-    /// use std::os::unix::io::{AsRawFd, RawFd};
-    /// #[cfg(target_os = "wasi")]
-    /// use std::os::wasi::io::{AsRawFd, RawFd};
+    /// use std::os::fd::{AsRawFd, RawFd};
     ///
     /// let mut f = File::open("foo.txt")?;
     /// // Note that `raw_fd` is only valid as long as `f` exists.
@@ -83,10 +80,7 @@ pub trait FromRawFd {
     /// ```no_run
     /// use std::fs::File;
     /// # use std::io;
-    /// #[cfg(unix)]
-    /// use std::os::unix::io::{FromRawFd, IntoRawFd, RawFd};
-    /// #[cfg(target_os = "wasi")]
-    /// use std::os::wasi::io::{FromRawFd, IntoRawFd, RawFd};
+    /// use std::os::fd::{FromRawFd, IntoRawFd, RawFd};
     ///
     /// let f = File::open("foo.txt")?;
     /// # #[cfg(any(unix, target_os = "wasi"))]
@@ -121,10 +115,7 @@ pub trait IntoRawFd {
     /// ```no_run
     /// use std::fs::File;
     /// # use std::io;
-    /// #[cfg(unix)]
-    /// use std::os::unix::io::{IntoRawFd, RawFd};
-    /// #[cfg(target_os = "wasi")]
-    /// use std::os::wasi::io::{IntoRawFd, RawFd};
+    /// use std::os::fd::{IntoRawFd, RawFd};
     ///
     /// let f = File::open("foo.txt")?;
     /// #[cfg(any(unix, target_os = "wasi"))]