From a87f5ca917b5c3c10163601da74df2045ee8e6ea Mon Sep 17 00:00:00 2001
From: Ralf Jung <post@ralfj.de>
Date: Sun, 13 Oct 2024 12:34:28 +0200
Subject: [PATCH] sys/unix: add comments for some Miri fallbacks

---
 library/std/src/sys/pal/unix/fs.rs             | 2 +-
 library/std/src/sys/sync/thread_parking/mod.rs | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/library/std/src/sys/pal/unix/fs.rs b/library/std/src/sys/pal/unix/fs.rs
index 39aabf0b2d6..e80299f1868 100644
--- a/library/std/src/sys/pal/unix/fs.rs
+++ b/library/std/src/sys/pal/unix/fs.rs
@@ -899,7 +899,7 @@ pub fn file_name(&self) -> OsString {
             target_os = "android",
             target_os = "hurd"
         ),
-        not(miri)
+        not(miri) // no dirfd on Miri
     ))]
     pub fn metadata(&self) -> io::Result<FileAttr> {
         let fd = cvt(unsafe { dirfd(self.dir.dirp.0) })?;
diff --git a/library/std/src/sys/sync/thread_parking/mod.rs b/library/std/src/sys/sync/thread_parking/mod.rs
index 0ebc5e093ee..f4d8fa0a58c 100644
--- a/library/std/src/sys/sync/thread_parking/mod.rs
+++ b/library/std/src/sys/sync/thread_parking/mod.rs
@@ -23,6 +23,7 @@
         mod windows7;
         pub use windows7::Parker;
     } else if #[cfg(all(target_vendor = "apple", not(miri)))] {
+        // Doesn't work in Miri, see <https://github.com/rust-lang/miri/issues/2589>.
         mod darwin;
         pub use darwin::Parker;
     } else if #[cfg(target_os = "xous")] {