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, 0 deletions

diff --git a/src/net.h b/src/net.h
index bd4eb77..314c709 100644
--- a/src/net.h
+++ b/src/net.h
@@ -121,6 +121,8 @@ extern int64 nBlocksWithoutParent; // ...of those, how many arrived orphaned
 // user pastes into an issue is what a developer already knows how to read.
 string GetDiagnosticsText();
 
+#include "sockcount.h"
+
 // Defined in main.cpp. Declared here because CNode announces it in the version
 // message, and net.h is included before main.h.
 extern int nBestHeight;