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diff --git a/src/rmr/si/src/si95/siclose.c b/src/rmr/si/src/si95/siclose.c
new file mode 100644
index 0000000..cb5cf36
--- /dev/null
+++ b/src/rmr/si/src/si95/siclose.c
@@ -0,0 +1,96 @@
+// vim: noet sw=4 ts=4:
+/*
+==================================================================================
+    Copyright (c) 2020 Nokia
+    Copyright (c) 2020 AT&T Intellectual Property.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+==================================================================================
+*/
+
+/* X
+******************************************************************************
+*
+*  Mnemonic: SIclose
+*  Abstract: This routine allows the user application to close a port
+*            associated with a file descriptor. The port is unbound from
+*            the transport providor even if it is marked as a listen
+*            port. If the fd passed in is less than 0 this routine assumes
+*            that the UDP port opened during init is to be closed (user never
+*            receives a fd on this one).
+*  Parms:    gptr - The pointer to the ginfo block (SIHANDLE to the user)
+*            fd   - FD to close.
+*  Returns:  SI_OK if all goes well, SI_ERROR with SIerrno set if there is
+*            a problem.
+*  Date:     3 February 1995
+*  Author:   E. Scott Daniels
+*
+*  Modified: 19 Feb 1995 - To set TP blk to drain if output pending.
+*            10 May 1995 - To change SOCK_RAW to SOCK_DGRAM
+*		22 Feb 2002 - To accept TCP_LISTEN_PORT or UDP_PORT as fd
+******************************************************************************
+*/
+#include "sisetup.h"
+
+extern int SIclose( struct ginfo_blk *gptr, int fd )
+{
+
+ struct tp_blk *tpptr;      //  pointer into tp list 
+ int status = SI_ERROR;     //  status of processing 
+
+ gptr->sierr = SI_ERR_HANDLE;
+ if( gptr->magicnum == MAGICNUM )   //  good cookie at the gptr address? 
+  {
+   gptr->sierr = SI_ERR_SESSID;
+
+   if( fd >= 0 )     //  if caller knew the fd number 
+    {
+     for( tpptr = gptr->tplist; tpptr != NULL && tpptr->fd != fd;
+          tpptr = tpptr->next );   //  find the tppblock to close 
+    }
+   else  //  user did not know the fd - find first Listener or UDP tp blk 
+   {
+	if( fd == TCP_LISTEN_PORT )			//  close first tcp listen port; else first udp 
+     		for( tpptr = gptr->tplist; tpptr != NULL && !(tpptr->flags&& TPF_LISTENFD); tpptr = tpptr->next );   
+	else
+    		for( tpptr = gptr->tplist; tpptr != NULL && tpptr->type != SOCK_DGRAM; tpptr = tpptr->next );
+   }
+
+   if( tpptr != NULL )
+    {
+     gptr->sierr = SI_ERR_TP;
+
+     if( tpptr->squeue == NULL )   //  if nothing is queued to send... 
+      {
+       tpptr->flags |= TPF_UNBIND;   //  ensure port is unbound from tp 
+	tpptr->flags |= TPF_DELETE;
+	{
+		int x = 1;
+
+		setsockopt(tpptr->fd, SOL_SOCKET, SO_LINGER, (char *)&x, sizeof( x ) ) ;
+	}
+	close( tpptr->fd );
+	tpptr->fd = -1;
+	tpptr->type = -1;
+			//  siterm now called in build poll if tp is marked delete 
+       // SIterm( gptr, gptr, tpptr );*/        /* cleanup and remove from the list 
+      }
+     else                       	//  stuff queued to send - mark port to drain 
+      tpptr->flags |= TPF_DRAIN;   //  and we will term the port when q empty 
+
+     status = SI_OK;               //  give caller a good status 
+    }                              //  end if we found a tpptr 
+  }                                //  end if the handle was good 
+
+ return( status );                 //  send the status back to the caller 
+}                                  //  SIclose