TcpStream::try_clone() -> Function not implemented (os error 88)

[victorbnl]

Attempting to run try_clone() on a TcpStream results in the following error.

Os { code: 88, kind: Unsupported, message: "Function not implemented" }

In my use case, this makes it impossible to use Apache Thrift on my ESP32. Is it more of an issue with the Rust ESP toolchain not supporting cloning TCP streams, or with Apache Thrift not supporting platforms which don’t support it?

Here is a minimal reproducible example: https://github.com/victorbnl/esp-rs-tcpstream-clone-88

[ivmarkov]

Sorry for reacting so late.
try_clone is unlikely to be implemented anytime soon, as there's a missing functionality in ESP-IDF itself: it does not support the Posix dup syscall. In other words, it cannot "duplicate" a file/socket handle. This also means we cannot support try_clone, as after try_clone you should end up with two separate TCP streams which have their own lifetime, but for that, we absolutely need dup. :)

[ivmarkov]

If you feel like contributing a dup support to ESP-IDF, implementing TCP stream try_clone would be a piece of cake afterwards.