Experimental Physics and
Industrial Control System

Folks,

I just want to give a heads-up that I have found a serious problem in base 7.0.4 on Windows.  Running a single IOC on a computer works fine.  However, additional IOCs started on the same machine cannot be reached with Channel Access.

I assume there will be a patch release soon.  Meanwhile this patch (actually a new file) will fix the problem.

corvette:local/epics/base-7.0.4>git diff R7.0.4 modules/libcom/

diff --git a/modules/libcom/src/osi/os/WIN32/osdSockAddrReuse.cpp b/modules/libcom/src/osi/os/WIN32/osdSockAddrReuse.cpp

new file mode 100644

index 0000000..cc13605

--- /dev/null

+++ b/modules/libcom/src/osi/os/WIN32/osdSockAddrReuse.cpp

@@ -0,0 +1,44 @@

+

+/*************************************************************************\

+* Copyright (c) 2002 The University of Chicago, as Operator of Argonne

+*     National Laboratory.

+* Copyright (c) 2002 The Regents of the University of California, as

+*     Operator of Los Alamos National Laboratory.

+* EPICS BASE Versions 3.13.7

+* and higher are distributed subject to a Software License Agreement found

+* in file LICENSE that is included with this distribution.

+\*************************************************************************/

+

+/*

+ * Author: Jeff Hill

+ */

+

+#define epicsExportSharedSymbols

+#include "osiSock.h"

+#include "errlog.h"

+

+/*

+ * Note: WINSOCK appears to assign a different functionality for

+ * SO_REUSEADDR compared to other OS. With WINSOCK SO_REUSEADDR indicates

+ * that simultaneously servers can bind to the same TCP port on the same host!

+ * Also, servers are always enabled to reuse a port immediately after

+ * they exit ( even if SO_REUSEADDR isnt set ).

+ */

+LIBCOM_API void epicsStdCall

+    epicsSocketEnableAddressReuseDuringTimeWaitState ( SOCKET s )

+{

+}

+

+LIBCOM_API void epicsStdCall

+    epicsSocketEnableAddressUseForDatagramFanout ( SOCKET s )

+{

+    int yes = true;

+    int status;

+    status = setsockopt ( s, SOL_SOCKET, SO_REUSEADDR,

+        (char *) & yes, sizeof ( yes ) );

+    if ( status < 0 ) {

+        errlogPrintf (

+            "epicsSocketEnablePortUseForDatagramFanout: "

+            "unable to set SO_REUSEADDR?\n");

+    }

+}

Mark