close() fds that have nothing more to read

src/daemon_tokfd.rs

@@ -67,6 +67,10 @@ impl FdInfo {
 
         self.name.get().unwrap_or_else(|| unreachable!())
     }
+
+    pub fn display(&self) -> FdInfoDisplay<'_> {
+        FdInfoDisplay { inner: self }
+    }
 }
 
 impl IdOrdItem for FdInfo {
@@ -79,6 +83,27 @@ impl IdOrdItem for FdInfo {
     iddqd::id_upcast!();
 }
 
+#[derive(Debug)]
+pub struct FdInfoDisplay<'a> {
+    inner: &'a FdInfo,
+}
+impl<'a> Display for FdInfoDisplay<'a> {
+    fn fmt(&self, f: &mut Formatter) -> FmtResult {
+        write!(
+            f,
+            "{} fd {} ({})",
+            self.inner.kind.name_str(),
+            self.inner.fd,
+            self.inner.name().to_string_lossy(),
+        )?;
+        if !self.inner.error_buffer.is_empty() {
+            write!(f, "; with errors: {}", self.inner.error_buffer.len())?;
+        }
+
+        Ok(())
+    }
+}
+
 #[derive(Copy)]
 #[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
 #[non_exhaustive]