diag: count sockets by where they were created, and whether the close took (#86)

A node was found holding 1502 sockets in Windows bound state, one ephemeral port
each, 9% of the machine range in nineteen hours. Reading the code did not find
it: every connect() failure path here closes its socket.

So count. Every socket is tagged at creation and untagged at close, across all
ten sites, with a counter for closes that fail. Already rules out three
explanations: nothing is created or closed behind the counter (untagged closes
are zero), no close is failing, and the leaked sockets are not in the live set --
tracked live matches what the OS reports as established, while the bound pile is
something the program already closed successfully.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/rpc.cpp b/src/rpc.cpp
index 97d8429..41c0328 100644
--- a/src/rpc.cpp
+++ b/src/rpc.cpp
@@ -46,10 +46,10 @@
 using json = nlohmann::json;
 
 #ifdef _WIN32
-#define sock_close(s)  closesocket(s)
+#define sock_close(s)  BtfCloseSocket(s)
 #define SEND_FLAGS     0
 #else
-#define sock_close(s)  ::close(s)
+#define sock_close(s)  BtfCloseSocket(s)
 #define SEND_FLAGS     MSG_NOSIGNAL
 #endif