Hello, the TcpSocket try_clone() method calls into .duplicate(), which sets the close-on-exec flag on the socket:

https://doc.rust-lang.org/src/std/net/tcp.rs.html#255-257
https://github.com/rust-lang/rust/blob/master/src/libstd/sys/unix/fd.rs#L197

I believe the documentation for try_clone() should be extended to describe:

• That this is an operation with the underlying operating system, dup() or WSADuplicateSocket() or whatever is appropriate (this would help address very similar issue 45536)
• That the duplication operation also sets the close-on-exec flag.

Thanks