Websocket proxy crash

Please include the following in your bug report:

**Version of emscripten/emsdk:**

emcc (Emscripten gcc/clang-like replacement + linker emulating GNU ld) 3.1.7 (48a16209b1a0de5efd8112ce6430415730008d18)
clang version 15.0.0 (https://github.com/llvm/llvm-project fbce4a78035c32792b0a13cf1f169048b822c06b)
Target: wasm32-unknown-emscripten
Thread model: posix
InstalledDir: /home/wjl/github/emsdk/upstream/bin

**Failing command line in full:**

./websocket_to_posix_proxy 8080
**Full link command and output with `-v` appended:**

It will make crashes.

terminate called after throwing an instance of 'std::system_error'
what(): Resource temporarily unavailable