1 files changed, 5 insertions, 6 deletions
diff --git a/library/std/src/sys/unix/fd.rs b/library/std/src/sys/unix/fd.rs
index 30812dabb4e..dbaa3c33e2e 100644
--- a/library/std/src/sys/unix/fd.rs
+++ b/library/std/src/sys/unix/fd.rs
@@ -4,7 +4,7 @@
 mod tests;
 
 use crate::cmp;
-use crate::io::{self, IoSlice, IoSliceMut, Read, ReadBuf};
+use crate::io::{self, BorrowedCursor, IoSlice, IoSliceMut, Read};
 use crate::os::unix::io::{AsFd, AsRawFd, BorrowedFd, FromRawFd, IntoRawFd, OwnedFd, RawFd};
 use crate::sys::cvt;
 use crate::sys_common::{AsInner, FromInner, IntoInner};
@@ -131,20 +131,19 @@ impl FileDesc {
         }
     }
 
-    pub fn read_buf(&self, buf: &mut ReadBuf<'_>) -> io::Result<()> {
+    pub fn read_buf(&self, mut cursor: BorrowedCursor<'_>) -> io::Result<()> {
         let ret = cvt(unsafe {
             libc::read(
                 self.as_raw_fd(),
-                buf.unfilled_mut().as_mut_ptr() as *mut libc::c_void,
-                cmp::min(buf.remaining(), READ_LIMIT),
+                cursor.as_mut().as_mut_ptr() as *mut libc::c_void,
+                cmp::min(cursor.capacity(), READ_LIMIT),
             )
         })?;
 
         // Safety: `ret` bytes were written to the initialized portion of the buffer
         unsafe {
-            buf.assume_init(ret as usize);
+            cursor.advance(ret as usize);
         }
-        buf.add_filled(ret as usize);
         Ok(())
     }