From fed7d789f6023eef1670974eb75b558691b16a8d Mon Sep 17 00:00:00 2001
From: Stephen Birarda <commit@birarda.com>
Date: Sun, 30 Nov 2014 17:29:18 -0800
Subject: [PATCH] have the domain-server write its local port into shared
 memory

---
 domain-server/src/DomainServer.cpp         | 13 +++++++++++++
 libraries/networking/src/LimitedNodeList.h |  2 ++
 2 files changed, 15 insertions(+)

diff --git a/domain-server/src/DomainServer.cpp b/domain-server/src/DomainServer.cpp
index 02f17bc502..84948e2406 100644
--- a/domain-server/src/DomainServer.cpp
+++ b/domain-server/src/DomainServer.cpp
@@ -18,6 +18,7 @@
 #include <QtCore/QJsonObject>
 #include <QtCore/QJsonArray>
 #include <QtCore/QProcess>
+#include <QtCore/qsharedmemory.h>
 #include <QtCore/QStandardPaths>
 #include <QtCore/QTimer>
 #include <QtCore/QUrlQuery>
@@ -228,6 +229,18 @@ void DomainServer::setupNodeListAndAssignments(const QUuid& sessionUUID) {
 
     LimitedNodeList* nodeList = LimitedNodeList::createInstance(domainServerPort, domainServerDTLSPort);
     
+    // no matter the local port, save it to shared mem so that local assignment clients can ask what it is
+    QSharedMemory* sharedPortMem = new QSharedMemory(DOMAIN_SERVER_LOCAL_PORT_SMEM_KEY, this);
+    quint16 localPort = nodeList->getNodeSocket().localPort();
+    
+    // attempt to create the shared memory segment
+    if (sharedPortMem->create(sizeof(localPort)) || sharedPortMem->attach()) {
+        memcpy(sharedPortMem->data(), &localPort, sizeof(localPort));
+        qDebug() << "Wrote local listening port to shared memory at key" << DOMAIN_SERVER_LOCAL_PORT_SMEM_KEY;
+    } else {
+        qWarning() << "Failed to create and attach to shared memory to share local port with assignment-client children.";
+    }
+    
     // set our LimitedNodeList UUID to match the UUID from our config
     // nodes will currently use this to add resources to data-web that relate to our domain
     const QString METAVERSE_DOMAIN_ID_KEY_PATH = "metaverse.id";
diff --git a/libraries/networking/src/LimitedNodeList.h b/libraries/networking/src/LimitedNodeList.h
index 64495fbd34..ad8c1688bb 100644
--- a/libraries/networking/src/LimitedNodeList.h
+++ b/libraries/networking/src/LimitedNodeList.h
@@ -44,6 +44,8 @@ const char DEFAULT_ASSIGNMENT_SERVER_HOSTNAME[] = "localhost";
 const char STUN_SERVER_HOSTNAME[] = "stun.highfidelity.io";
 const unsigned short STUN_SERVER_PORT = 3478;
 
+const QString DOMAIN_SERVER_LOCAL_PORT_SMEM_KEY = "domain-server.local-port";
+
 class HifiSockAddr;
 
 typedef QSet<NodeType_t> NodeSet;