Add some debug output

debug.patch

diff --git a/Csocket.cpp b/Csocket.cpp
index b2bcf44..3c6640c 100644
--- a/Csocket.cpp
+++ b/Csocket.cpp
@@ -53,6 +53,21 @@ namespace Csocket
 {
 #endif /* _NO_CSOCKET_NS */
 
+#include <execinfo.h>
+static inline void v6_foo(bool old_val, bool new_val, const char *msg)
+{
+	const int max_stack = 64;
+	void *stack[max_stack];
+	CS_DEBUG("Setting v6 from " << old_val << " to " << new_val << " due to: " << msg);
+	int stack_size = backtrace(stack, max_stack);
+	backtrace_symbols_fd(stack, stack_size, 1);
+}
+
+static inline void v6_foo(Csock * pSock, bool new_val, const char *msg)
+{
+	v6_foo(pSock->GetIPv6(), new_val, msg);
+}
+
 static int g_iCsockSSLIdx = 0; //!< this get setup once in InitSSL
 int GetCsockClassIdx()
 {
@@ -246,12 +261,14 @@ static void AresHostCallback( void *pArg, int status, int timeouts, struct hoste
 		CSSockAddr *pSockAddr = pSock->GetCurrentAddr();
 		if( hent->h_addrtype == AF_INET )
 		{
+			v6_foo(pSock, false, "dns callback");
 			pSock->SetIPv6( false );
 			memcpy( pSockAddr->GetAddr(), hent->h_addr_list[0], sizeof( *(pSockAddr->GetAddr()) ) );
 		}
 #ifdef HAVE_IPV6
 		else if( hent->h_addrtype == AF_INET6 )
 		{
+			v6_foo(pSock, true, "dns callback");
 			pSock->SetIPv6( true );
 			memcpy( pSockAddr->GetAddr6(), hent->h_addr_list[0], sizeof( *(pSockAddr->GetAddr6()) ) );
 		}
@@ -273,6 +290,7 @@ int GetAddrInfo( const CS_STRING & sHostname, Csock *pSock, CSSockAddr & csSockA
 {
 #ifndef HAVE_IPV6
 	// if ipv6 is not enabled, then simply use gethostbyname, nothing special outside of this is done
+	v6_foo(csSockAddr, false, "GetAddrInfo");
 	if( pSock )
 		pSock->SetIPv6( false );
 	csSockAddr.SetIPv6( false );
@@ -323,6 +341,7 @@ int GetAddrInfo( const CS_STRING & sHostname, Csock *pSock, CSSockAddr & csSockA
 			bool bTryConnect = false;
 			if( pRes->ai_family == AF_INET )
 			{
+				v6_foo(pSock, false, "getaddrinfo, case AF_INET");
 				if( pSock )
 					pSock->SetIPv6( false );
 				csSockAddr.SetIPv6( false );
@@ -340,6 +359,7 @@ int GetAddrInfo( const CS_STRING & sHostname, Csock *pSock, CSSockAddr & csSockA
 			}
 			else if( pRes->ai_family == AF_INET6 )
 			{
+				v6_foo(pSock, true, "getaddrinfo, case AF_INET6");
 				if( pSock )
 					pSock->SetIPv6( true );
 				csSockAddr.SetIPv6( true );
@@ -2198,6 +2218,7 @@ int Csock::GetAddrInfo( const CS_STRING & sHostname, CSSockAddr & csSockAddr )
 #ifdef HAVE_IPV6
 	if( csSockAddr.GetAFRequire() != AF_INET && inet_pton( AF_INET6, sHostname.c_str(), csSockAddr.GetAddr6() ) > 0 )
 	{
+		v6_foo(this, true, "Csock::getaddrinfo, got an IP");
 		SetIPv6( true );
 		return( 0 );
 	}
@@ -2205,6 +2226,7 @@ int Csock::GetAddrInfo( const CS_STRING & sHostname, CSSockAddr & csSockAddr )
 	if( inet_pton( AF_INET, sHostname.c_str(), csSockAddr.GetAddr() ) > 0 )
 	{
 #ifdef HAVE_IPV6
+		v6_foo(this, false, "Csock::getaddrinfo, got an IPv6");
 		SetIPv6( false );
 #endif /* HAVE_IPV6 */
 		return( 0 );