HarryR / nt365 / 26714000618

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github

Committed by HarryR

Commit Message

ws2_32: WSAIoctl + real TCP keepalive via AFD (and fix SO_KEEPALIVE)

Add ws2_32!WSAIoctl (synchronous-only) and wire TCP keepalive end to end so
socket.ioctl(SIO_KEEPALIVE_VALS) and setsockopt(SO_KEEPALIVE) actually
enable/disable keepalive on the connection -- the last Tier-1 symbol for
headless CPython 2.7.

There is no WSH helper DLL (wshtcpip) in MicroNT, so the option-setting NT
normally does in user mode is relocated into AFD:

  ws2_32 WSAIoctl / setsockopt(SO_KEEPALIVE)
    -> IOCTL_AFD_SET_INFORMATION (new AFD_KEEPALIVE info code)
       -> AfdSetInformation: store on endpoint; if connected,
          AfdSetKeepAliveOnConnection() issues IOCTL_TCP_SET_INFORMATION_EX
          (TCP_SOCKET_KEEPALIVE) on the TDI connection
       -> keepalive set before connect is applied at connect (CONNECT.C);
          the flag lands on the connection object and is inherited by the TCB

TCP is unchanged -- TCPSetInformationEx/TdiSetInformationEx already set the
KEEPALIVE flag. WSAIoctl is synchronous-only: SIO_RCVALL, the extension-
function pointer, and any overlapped request return WSAEOPNOTSUPP so this one
symbol cannot pull in the IOCP/mswsock surface.

tcp_keepalive.onoff is honored for real; keepalivetime/keepaliveinterval are
accepted but ignored -- this TCP is NT4-era with global keepalive timers.
Per-socket timers (the Win2000 SIO_KEEPALIVE_VALS option) are future work (#8).

SO_KEEPALIVE setsockopt/getsockopt previously fell to the absent helper-DLL
path (WSAENOPROTOOPT); both now route through AFD_KEEPALIVE and round-trip a
cached socket->KeepAlive.

Lua nt.net.afd selftests drive the kernel path both connected and pre-connect;
coverage confirms AfdSetKeepAliveOnConnection and the TCP enable/disable
branches execute.

Closes #7.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Coverage Stats

23 of 26 new or added lines in 2 files covered. (88.46%)

200 existing lines in 19 files now uncovered.

47864 of 114043 relevant lines covered (41.97%)

2682.3 hits per line