2 files changed, 25 insertions, 4 deletions
diff --git a/library/std/src/sys/wasi/fs.rs b/library/std/src/sys/wasi/fs.rs
index 6614ae397..510cf36b1 100644
--- a/library/std/src/sys/wasi/fs.rs
+++ b/library/std/src/sys/wasi/fs.rs
@@ -3,7 +3,7 @@
 use super::fd::WasiFd;
 use crate::ffi::{CStr, CString, OsStr, OsString};
 use crate::fmt;
-use crate::io::{self, IoSlice, IoSliceMut, ReadBuf, SeekFrom};
+use crate::io::{self, BorrowedCursor, IoSlice, IoSliceMut, SeekFrom};
 use crate::iter;
 use crate::mem::{self, ManuallyDrop};
 use crate::os::raw::c_int;
@@ -439,8 +439,8 @@ impl File {
         true
     }
 
-    pub fn read_buf(&self, buf: &mut ReadBuf<'_>) -> io::Result<()> {
-        crate::io::default_read_buf(|buf| self.read(buf), buf)
+    pub fn read_buf(&self, cursor: BorrowedCursor<'_>) -> io::Result<()> {
+        crate::io::default_read_buf(|buf| self.read(buf), cursor)
     }
 
     pub fn write(&self, buf: &[u8]) -> io::Result<usize> {
diff --git a/library/std/src/sys/wasi/stdio.rs b/library/std/src/sys/wasi/stdio.rs
index 4cc0e4ed5..d2081771b 100644
--- a/library/std/src/sys/wasi/stdio.rs
+++ b/library/std/src/sys/wasi/stdio.rs
@@ -4,7 +4,7 @@ use super::fd::WasiFd;
 use crate::io::{self, IoSlice, IoSliceMut};
 use crate::mem::ManuallyDrop;
 use crate::os::raw;
-use crate::os::wasi::io::{AsRawFd, FromRawFd};
+use crate::os::wasi::io::{AsFd, AsRawFd, BorrowedFd, FromRawFd};
 
 pub struct Stdin;
 pub struct Stdout;
@@ -23,6 +23,13 @@ impl AsRawFd for Stdin {
     }
 }
 
+impl AsFd for Stdin {
+    #[inline]
+    fn as_fd(&self) -> BorrowedFd<'_> {
+        unsafe { BorrowedFd::borrow_raw(0) }
+    }
+}
+
 impl io::Read for Stdin {
     fn read(&mut self, data: &mut [u8]) -> io::Result<usize> {
         self.read_vectored(&mut [IoSliceMut::new(data)])
@@ -51,6 +58,13 @@ impl AsRawFd for Stdout {
     }
 }
 
+impl AsFd for Stdout {
+    #[inline]
+    fn as_fd(&self) -> BorrowedFd<'_> {
+        unsafe { BorrowedFd::borrow_raw(1) }
+    }
+}
+
 impl io::Write for Stdout {
     fn write(&mut self, data: &[u8]) -> io::Result<usize> {
         self.write_vectored(&[IoSlice::new(data)])
@@ -82,6 +96,13 @@ impl AsRawFd for Stderr {
     }
 }
 
+impl AsFd for Stderr {
+    #[inline]
+    fn as_fd(&self) -> BorrowedFd<'_> {
+        unsafe { BorrowedFd::borrow_raw(2) }
+    }
+}
+
 impl io::Write for Stderr {
     fn write(&mut self, data: &[u8]) -> io::Result<usize> {
         self.write_vectored(&[IoSlice::new(data)])