Add try_clone for AsFd types

src/lib.rs

@@ -9,10 +9,18 @@ use std::{
 pub mod io;
 pub mod net;
 
-pub use rustix::{
-    fd::{AsFd, AsRawFd, BorrowedFd},
-    io::OwnedFd,
-};
+pub mod fd {
+    pub use rustix::{
+        fd::{AsFd, AsRawFd, BorrowedFd},
+        io::OwnedFd,
+    };
+
+    pub fn try_clone<A: AsFd>(fd: A) -> super::io::Result<OwnedFd> {
+        rustix::fs::fcntl_dupfd_cloexec(fd, 0).map_err(From::from)
+    }
+}
+
+use fd::{AsFd, OwnedFd};
 
 #[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
 pub struct KeyRef(*const ());