[chrisuthe]

On Windows every socket call fails until WSAStartup() runs, and IXWebSocket leaves that to the application through ix::initNetSystem(). The client could neither dial a server ("Either the application has not called WSAStartup") nor listen.

Summary

• SendspinWsServer::start() and SendspinClientConnection::start() call ix::initNetSystem() once, through a function-local static, before their first socket. It is never undone; Windows releases it at process exit.
• The two handle a failure differently on purpose. The server's start() returns a bool, so it logs and returns false. The client's start() has no failure return, so it logs and lets the attempt go ahead; its first socket call then fails and IXWebSocket reports it as the connection's Error, which already reports the close.

Notes

• A no-op on POSIX (initNetSystem() returns true without doing anything there).
• Follows Build the library on Windows with clang-cl #210, which made the library compile on Windows with clang-cl. Split out of Fix what running on Windows turns up #211.

Testing

• Windows 11, clang-cl 22.1.3 (from Fix what running on Windows turns up #211): basic_client dials Music Assistant with -u and listens on its own port; before this change both failed with the WSAStartup error.
• Linux, GCC 16: host build clean; sendspin_tests all pass. The ASan/UBSan and TSan runs are this PR's CI (no sanitizer runtime on the local machine).

[kahrendt]

Thanks