From a257a3a2b12e479c8d895d0f6fb5eb0e48898edd Mon Sep 17 00:00:00 2001
From: Taiki Endo <te316e89@gmail.com>
Date: Sat, 27 Mar 2021 12:28:51 +0900
Subject: [PATCH] io: add AsyncSeekExt::stream_position (#3650)

---
 tokio/src/io/util/async_seek_ext.rs | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/tokio/src/io/util/async_seek_ext.rs b/tokio/src/io/util/async_seek_ext.rs
index 813913fdc..297a4a61a 100644
--- a/tokio/src/io/util/async_seek_ext.rs
+++ b/tokio/src/io/util/async_seek_ext.rs
@@ -66,6 +66,17 @@ cfg_io_util! {
         {
             seek(self, pos)
         }
+
+        /// Creates a future which will return the current seek position from the
+        /// start of the stream.
+        ///
+        /// This is equivalent to `self.seek(SeekFrom::Current(0))`.
+        fn stream_position(&mut self) -> Seek<'_, Self>
+        where
+            Self: Unpin,
+        {
+            self.seek(SeekFrom::Current(0))
+        }
     }
 }