// -*- Mode: C++; -*-
//                            Package   : omniORB2
// tcpSocketMTfactory.cc      Created on: 18/3/96
//                            Author    : Sai Lai Lo (sll)
//
//    Copyright (C) 1996-1999 AT&T Laboratories Cambridge
//
//    This file is part of the omniORB library
//
//    The omniORB library is free software; you can redistribute it and/or
//    modify it under the terms of the GNU Library General Public
//    License as published by the Free Software Foundation; either
//    version 2 of the License, or (at your option) any later version.
//
//    This library is distributed in the hope that it will be useful,
//    but WITHOUT ANY WARRANTY; without even the implied warranty of
//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
//    Library General Public License for more details.
//
//    You should have received a copy of the GNU Library General Public
//    License along with this library; if not, write to the Free
//    Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  
//    02111-1307, USA
//
//
// Description:
//	Implementation of the Strand using TCP/IP and BSD socket interface
//	

/*
  $Log: tcpSocketMTfactory.cc,v $
  Revision 1.16  1999/03/11 16:25:57  djr
  Updated copyright notice

  Revision 1.15  1999/02/19 12:22:33  djr
  Fixed typo: sunsos -> sunos

  Revision 1.14  1998/11/09 10:56:57  sll
  Removed the use of the reserved keyword "export".

  Revision 1.13  1998/09/23 15:31:15  sll
  Previously, tcpSocketStrand::shutdown sends an incomplete GIOP
  CloseConnection message (the message length field is missing). Fixed.

  Revision 1.12  1998/09/23 08:48:34  sll
  Use config variable omniORB::maxTcpConnectionPerServer to determine the
  maximum number of outgoing per tcpSocketOutgoingRope.

  Revision 1.11  1998/08/14 13:54:38  sll
  Added pragma hdrstop to control pre-compile header if the compiler feature
  is available.

  Revision 1.10  1998/06/29 17:13:30  sll
  Fixed Solaris specific code in realConnect. Now switch the socket back
  to blocking mode after connect() until all circumstance.

  Revision 1.9  1998/04/22 16:39:50  sll
  Added try-catch loop to guard against exception raised by the thread library
  when it cannot create a new thread for tcpSocketWorker.

  Revision 1.8  1998/04/08 16:06:49  sll
  Added support for Reliant UNIX 5.43

  Revision 1.7  1998/04/07 19:39:40  sll
  Replace cerr with omniORB::log.

  Revision 1.6  1998/03/19 19:53:14  sll
  Delay connect to the remote address space until the first send or recv.
  Previously, connect was made inside the ctor of tcpSocketStrand.

  Revision 1.5  1998/03/04 14:44:36  sll
  Updated to use omniORB::giopServerThreadWrapper.

// Revision 1.4  1998/01/20  17:32:38  sll
// Added support for OpenVMS.
//
  Revision 1.3  1997/12/18 17:27:39  sll
  Updated to work under glibc-2.0.

  Revision 1.2  1997/12/12 18:44:11  sll
  Added call to gateKeeper.

  Revision 1.1  1997/12/09 18:43:18  sll
  Initial revision

  */

#include <omniORB2/CORBA.h>

#ifdef HAS_pch
#pragma hdrstop
#endif

#include <ropeFactory.h>
#include <tcpSocket.h>

#if defined(__WIN32__)

#include <winsock.h>
#include <sys/types.h>

#define RC_INADDR_NONE     INADDR_NONE
#define RC_INVALID_SOCKET  INVALID_SOCKET
#define RC_SOCKET_ERROR    SOCKET_ERROR
#define INETSOCKET         PF_INET
#define CLOSESOCKET(sock)  closesocket(sock)
#define SHUTDOWNSOCKET(sock) ::shutdown(sock,2)
#else

#include <sys/time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>

#if defined(__sunos__) && defined(__sparc__) && __OSVERSION__ >= 5
#include <sys/types.h>
#include <fcntl.h>
#endif

#define RC_INADDR_NONE     ((CORBA::ULong)-1)
#define RC_INVALID_SOCKET  (-1)
#define RC_SOCKET_ERROR    (-1)
#define INETSOCKET         AF_INET
#define CLOSESOCKET(sock)   close(sock)
#if defined(__sunos__) && defined(__sparc__) && __OSVERSION__ >= 5
#define SHUTDOWNSOCKET(sock)  ::shutdown(sock,2)
#elif defined(__osf1__) && defined(__alpha__)
#define SHUTDOWNSOCKET(sock)  ::shutdown(sock,2)
#else
  // XXX none of the above, calling shutdown() may not have the
  // desired effect.
#define SHUTDOWNSOCKET(sock)  ::shutdown(sock,2)
#endif
#endif

#include <sys/types.h>
#include <errno.h>
#include <stdio.h>

#include <libcWrapper.h>
#include <gatekeeper.h>

#ifdef NEED_GETHOSTNAME_PROTOTYPE
extern "C" int gethostname(char *name, int namelen);
#endif

class tcpSocketRendezvouser : public omni_thread {
public:
  tcpSocketRendezvouser(tcpSocketIncomingRope *r) : omni_thread(r) {
    start_undetached();
  }
  virtual ~tcpSocketRendezvouser() { }
  virtual void* run_undetached(void *arg);

private:
  tcpSocketRendezvouser();
};

class tcpSocketWorker : public omni_thread {
public:
  tcpSocketWorker(tcpSocketStrand* s) : omni_thread(s), pd_sync(s,0,0) {
    s->decrRefCount();
    start();
  }
  virtual ~tcpSocketWorker() { }
  virtual void run(void *arg);
  static void _realRun(void* arg);

private:
  Strand::Sync    pd_sync;
};

/////////////////////////////////////////////////////////////////////////////

tcpSocketMTincomingFactory::tcpSocketMTincomingFactory() : pd_state(IDLE)
{
  tcpSocketFactoryType::init();
}
 
CORBA::Boolean
tcpSocketMTincomingFactory::isIncoming(Endpoint* addr) const
{
  Rope_iterator next_rope(&pd_anchor);
  Rope* r;
  while ((r = next_rope()))
    {
      if (r->this_is(addr))
	return 1;
    }
  return 0;
}

void
tcpSocketMTincomingFactory::instantiateIncoming(Endpoint* addr,
						CORBA::Boolean exportflag)
{
  tcpSocketEndpoint* te = tcpSocketEndpoint::castup(addr);
  if (!te)
    throw omniORB::fatalException(__FILE__,__LINE__,
				  "wrong endpoint argument type");

  Rope_iterator rope_lock(&pd_anchor);

  if (pd_state == ZOMBIE) {
    throw omniORB::fatalException(__FILE__,__LINE__,
			    "cannot instantiate incoming in ZOMBIE state");
  }

  tcpSocketIncomingRope* r = new tcpSocketIncomingRope(this,0,te,exportflag);
  r->incrRefCount(1);

  if (pd_state == ACTIVE) {
    r->rendezvouser = new tcpSocketRendezvouser(r);
  }
}

void
tcpSocketMTincomingFactory::startIncoming()
{
  Rope_iterator next_rope(&pd_anchor);
  tcpSocketIncomingRope* r;

  switch (pd_state) {
  case IDLE:
    try {
      pd_state = ACTIVE;
      while ((r = (tcpSocketIncomingRope*)next_rope())) {
	if (r->pd_shutdown == tcpSocketIncomingRope::NO_THREAD) {
	  r->pd_shutdown = tcpSocketIncomingRope::ACTIVE;
	  r->rendezvouser = new tcpSocketRendezvouser(r);
	}
      }
    }
    catch(...) { }
    break;
  default:
    break;
  }
}

void
tcpSocketMTincomingFactory::stopIncoming()
{
  Rope_iterator next_rope(&pd_anchor);
  tcpSocketIncomingRope* r;

  switch (pd_state) {
  case ACTIVE:
    try {
      while ((r = (tcpSocketIncomingRope*)next_rope())) {
	r->cancelThreads();
      }
      pd_state = IDLE;
    }
    catch(...) {}
    break;
  default:
    break;
  }
}

void
tcpSocketMTincomingFactory::removeIncoming()
{
  Rope_iterator next_rope(&pd_anchor);
  tcpSocketIncomingRope* r;

  switch (pd_state) {
  case ACTIVE:
  case IDLE:
    try {
      while ((r = (tcpSocketIncomingRope*)next_rope())) {
	r->cancelThreads();
	if (r->pd_shutdown != tcpSocketIncomingRope::NO_THREAD) {
	  // rendezvouser has not been shutdown properly
	  continue;
	}
	if (r->pd_rendezvous != RC_INVALID_SOCKET) {
	  CLOSESOCKET(r->pd_rendezvous);
	  r->pd_rendezvous = RC_INVALID_SOCKET;
	  r->decrRefCount(1);
	}
      }
      pd_state = ZOMBIE;
    }
    catch(...) {}
    break;
  default:
    break;
  }
}

Rope*
tcpSocketMTincomingFactory::findIncoming(Endpoint* addr) const
{
  tcpSocketEndpoint* te = tcpSocketEndpoint::castup(addr);
  if (!te) return 0;

  Rope_iterator next_rope(&pd_anchor);
  Rope* r;
  while ((r = next_rope()))
    {
      if (r->this_is(addr)) {
	r->incrRefCount(1);
	return r;
      }
    }
  return 0;
}

void 
tcpSocketMTincomingFactory::getIncomingIOPprofiles(const CORBA::Octet* objkey,
						   const size_t objkeysize,
			      IOP::TaggedProfileList& profilelist) const
{
  Rope_iterator next_rope(&pd_anchor);
  tcpSocketIncomingRope* r;
  while ((r = (tcpSocketIncomingRope*) next_rope()) && r->pd_export) {
    CORBA::ULong index = profilelist.length();
    profilelist.length(index+1);
    tcpSocketFactoryType::singleton->encodeIOPprofile(r->me,objkey,objkeysize,
						      profilelist[index]);
  }
}

tcpSocketIncomingRope::tcpSocketIncomingRope(tcpSocketMTincomingFactory* f,
					     unsigned int maxStrands,
					     tcpSocketEndpoint *e,
					     CORBA::Boolean exportflag)
  : Rope(f->anchor(),maxStrands,1), pd_export(exportflag), 
    pd_shutdown(NO_THREAD), rendezvouser(0)
{
  struct sockaddr_in myaddr;

  // For the moment, we do not impose a restriction on the maximum
  // no. of strands that can be accepted. In other words, <maxStrands> is 
  // ignored.

  if ((pd_rendezvous = socket(INETSOCKET,SOCK_STREAM,0)) == RC_INVALID_SOCKET) {
    throw CORBA::COMM_FAILURE(errno,CORBA::COMPLETED_NO);
  }
  myaddr.sin_family = INETSOCKET;
  myaddr.sin_addr.s_addr = INADDR_ANY;
  myaddr.sin_port = htons(e->port());
  
  if (e->port()) {
    int valtrue = 1;
    if (setsockopt(pd_rendezvous,SOL_SOCKET,
		   SO_REUSEADDR,(char*)&valtrue,sizeof(int)) == RC_SOCKET_ERROR)
      {
	CLOSESOCKET(pd_rendezvous);
	throw CORBA::COMM_FAILURE(errno,CORBA::COMPLETED_NO);
      }
  }

  if (bind(pd_rendezvous,(struct sockaddr *)&myaddr,
	   sizeof(struct sockaddr_in)) == RC_SOCKET_ERROR) 
  {
    CLOSESOCKET(pd_rendezvous);
    throw CORBA::COMM_FAILURE(errno,CORBA::COMPLETED_NO);
  }

  // Make it a passive socket
  if (listen(pd_rendezvous,5) == RC_SOCKET_ERROR) {
    CLOSESOCKET(pd_rendezvous);
    throw CORBA::COMM_FAILURE(errno,CORBA::COMPLETED_NO);
  }
  
  {
#if (defined(__GLIBC__) && __GLIBC__ >= 2)
    // GNU C library uses socklen_t * instead of int* in getsockname().
    // This is suppose to be compatible with the upcoming POSIX standard.
    socklen_t l;
#elif defined(__aix__) || defined(__VMS) || defined(__SINIX__)
    size_t l;
# else
    int l;
# endif



    l = sizeof(struct sockaddr_in);
    if (getsockname(pd_rendezvous,
		    (struct sockaddr *)&myaddr,&l) == RC_SOCKET_ERROR) {
      CLOSESOCKET(pd_rendezvous);
      throw CORBA::COMM_FAILURE(errno,CORBA::COMPLETED_NO);
    }

    e->port(ntohs(myaddr.sin_port));

    if (e->host() == 0 || strlen((const char*)e->host()) == 0) {

      char self[64];
      if (gethostname(&self[0],64) == RC_SOCKET_ERROR) {
	throw omniORB::fatalException(__FILE__,__LINE__,
				      "Cannot get the name of this host");
      }

      LibcWrapper::hostent_var h;
      int rc;

      if (LibcWrapper::gethostbyname(self,h,rc) < 0) {
	throw omniORB::fatalException(__FILE__,__LINE__,
				      "Cannot get the address of this host");
      }
      memcpy((void *)&myaddr.sin_addr,
	     (void *)h.hostent()->h_addr_list[0],
	     sizeof(myaddr.sin_addr));
      char ipaddr[16];
      // To prevent purify from generating UMR warnings, use the following temp
      // variables to store the IP address fields.
      int ip1 = (int)((ntohl(myaddr.sin_addr.s_addr) & 0xff000000) >> 24);
      int ip2 = (int)((ntohl(myaddr.sin_addr.s_addr) & 0x00ff0000) >> 16);
      int ip3 = (int)((ntohl(myaddr.sin_addr.s_addr) & 0x0000ff00) >> 8);
      int ip4 = (int)(ntohl(myaddr.sin_addr.s_addr) & 0x000000ff);
      sprintf(ipaddr,"%d.%d.%d.%d",ip1,ip2,ip3,ip4);
      e->host((const CORBA::Char *) ipaddr);

    }
    else {
      // The caller has already specified the host name, we are not going to
      // override it here. However, it may be possible that the host name does
      // not resolve to one of the IP addresses that identified the network
      // interfaces of this machine. There is no way to guard against this
      // mistake.
      // Do nothing here.
    }
  }

  me = new tcpSocketEndpoint(e);
}

tcpSocketIncomingRope::~tcpSocketIncomingRope()
{
  if (omniORB::traceLevel >= 15) {
    omniORB::log << "tcpSocketIncomingRope::~tcpSocketIncomingRope: called.\n";
    omniORB::log.flush();
  }
  if (me) {
    delete me;
    me = 0;
  }
  if (pd_rendezvous != RC_INVALID_SOCKET) {
    CLOSESOCKET(pd_rendezvous);
    pd_rendezvous = RC_INVALID_SOCKET;
  }
}

void
tcpSocketIncomingRope::cancelThreads()
{
  if (rendezvouser) {
      pd_lock.lock();
      pd_shutdown = SHUTDOWN;
      pd_lock.unlock();
  }
  CutStrands();
  
  if (rendezvouser) {
    // Unblock the rendezvouser from its accept() call.
    // Cannot shutdown the rendezvous socket because we want to keep it open
    // and could be served later by another rendezvouser.
    // 
    // Instead, unblock the rendezvouser by making a connect() call.

    struct sockaddr_in myaddr;

    {
      Endpoint* e = 0;
      this_is(e);
      tcpSocketEndpoint* te = (tcpSocketEndpoint*)e;
      myaddr.sin_family = INETSOCKET;
      myaddr.sin_port   = htons(te->port());
      if (LibcWrapper::isipaddr((char*)te->host())) 
	{
	  CORBA::ULong ip_p = inet_addr((char*) te->host());
	  memcpy((void*) &myaddr.sin_addr, (void*) &ip_p, sizeof(myaddr.sin_addr));
	}
      else
	{
	  LibcWrapper::hostent_var h;
	  int  rc;
	  LibcWrapper::gethostbyname((char*)te->host(),h,rc);
	  memcpy((void*)&myaddr.sin_addr,
		 (void*)h.hostent()->h_addr_list[0],
		 sizeof(myaddr.sin_addr));
	}
      delete te;
    }

    tcpSocketHandle_t  tmp_sock;

    if ((tmp_sock = socket(INETSOCKET,SOCK_STREAM,0)) == RC_INVALID_SOCKET) 
      {
	// If we cannot create a socket, we cannot shutdown the rendezvouser
	if (omniORB::traceLevel > 0) {
	  omniORB::log << "tcpSocketIncomingRope::cancelThreads() cannot create a socket to connect to the rendezvous socket.\n"
		       << "The rendezvous thread may or may not have exited.\n"
		       << "If this is temporary resource exhaustion, try again later.\n";
	  omniORB::log.flush();
	}
	return;
      }
    if (connect(tmp_sock,(struct sockaddr *)&myaddr,
		sizeof(struct sockaddr_in)) == RC_SOCKET_ERROR) 
      {
	// OK, so we cannot connect to the rendezvouser, it would have
	// unblock from accept() anyway. That is fine as well.
      }
    else 
      {
	// Now we have unblock the rendezvouser, just close the socket.
	CLOSESOCKET(tmp_sock);
      }

    // Now we have got the rendezvouser's attention. We acknowlege that
    // we have seen it and instructs the rendezvouser to exit.
    pd_lock.lock();
    pd_shutdown = NO_THREAD;
    pd_lock.unlock();

    if (omniORB::traceLevel >= 15) {
      omniORB::log << "tcpSocketMTincomingFactory::stopIncoming: Waiting for tcpSocketMT Rendezvouser to exit...\n";
      omniORB::log.flush();
    }
    rendezvouser->join(0); // Wait till the rendezvouser to come back
    if (omniORB::traceLevel >= 15) {
      omniORB::log << "tcpSocketMTincomingFactory::stopIncoming: tcpSocketMT Rendezvouser has exited\n";
      omniORB::log.flush();
    }
    rendezvouser = 0;
  }
}

Strand *
tcpSocketIncomingRope::newStrand()
{
  throw omniORB::fatalException(__FILE__,__LINE__,
				"newStrand should not be called.");
#ifdef NEED_DUMMY_RETURN
  return 0; // dummy return to keep some compilers happy
#endif
}

/////////////////////////////////////////////////////////////////////////////

tcpSocketMToutgoingFactory::tcpSocketMToutgoingFactory()
{
  tcpSocketFactoryType::init();
}

CORBA::Boolean
tcpSocketMToutgoingFactory::isOutgoing(Endpoint* addr) const
{
  Rope_iterator next_rope(&pd_anchor);
  Rope* r;
  while ((r = next_rope()))
    {
      if (r->remote_is(addr))
	return 1;
    }
  return 0;
}

Rope*
tcpSocketMToutgoingFactory::findOrCreateOutgoing(Endpoint* addr)
{
  tcpSocketEndpoint* te = tcpSocketEndpoint::castup(addr);
  if (!te) return 0;

  Rope_iterator next_rope(&pd_anchor);
  Rope* r;
  while ((r = next_rope()))
    {
      if (r->remote_is(addr)) {
	r->incrRefCount(1);
	return r;
      }
    }
  r = new tcpSocketOutgoingRope(this,omniORB::maxTcpConnectionPerServer,te);
  r->incrRefCount(1);
  return r;
}


tcpSocketOutgoingRope::tcpSocketOutgoingRope(tcpSocketMToutgoingFactory* f,
					     unsigned int maxStrands,
					     tcpSocketEndpoint *e)
  : Rope(f->anchor(),maxStrands,1)
{
  remote = new tcpSocketEndpoint(e);
}

tcpSocketOutgoingRope::~tcpSocketOutgoingRope()
{
  if (omniORB::traceLevel >= 15) {
    omniORB::log << "tcpSocketOutgoingRope::~tcpSocketOutgoingRope: called.\n";
    omniORB::log.flush();
  }
  if (remote) {
    delete remote;
    remote = 0;
  }
}

Strand *
tcpSocketOutgoingRope::newStrand()
{
  return new tcpSocketStrand(this,remote,1);
}


/////////////////////////////////////////////////////////////////////////////



// Size of transmit and receive buffers
const 
unsigned int 
tcpSocketStrand::buffer_size = 8192 + (int)omni::max_alignment;


static tcpSocketHandle_t realConnect(tcpSocketEndpoint* r);


tcpSocketStrand::tcpSocketStrand(tcpSocketOutgoingRope *rope,
				 tcpSocketEndpoint   *r,
				 CORBA::Boolean heapAllocated)
  : reliableStreamStrand(tcpSocketStrand::buffer_size,rope,heapAllocated),
    pd_send_giop_closeConnection(0), pd_delay_connect(0)
{
  // Do not try to connect to the remote host in this ctor.
  // This is to avoid holding the mutex on rope->pd_lock while the connect
  // is in progress. Holding the mutex for an extended period is bad as this 
  // can have ***serious*** side effect. 
  // One immediate consequence of holding the rope->pd_lock is that the
  // outScavenger will be blocked on rope->pd_lock when it is scanning
  // for idle strands. This in turn blockout any thread trying to lock
  // rope->pd_anchor->pd_lock. This is really bad because no new rope
  // can be added to the anchor.


  pd_socket = RC_INVALID_SOCKET;
  pd_delay_connect = new tcpSocketEndpoint(r);
  // Do the connect on first call to ll_recv or ll_send.
}

tcpSocketStrand::tcpSocketStrand(tcpSocketIncomingRope *r,
				 tcpSocketHandle_t sock,
				 CORBA::Boolean heapAllocated)
  : reliableStreamStrand(tcpSocketStrand::buffer_size,r,heapAllocated),
    pd_socket(sock), pd_send_giop_closeConnection(1), pd_delay_connect(0)
{
}


tcpSocketStrand::~tcpSocketStrand() 
{
  if (omniORB::traceLevel >= 5) {
    omniORB::log << "tcpSocketStrand::~Strand() close socket no. " << pd_socket << "\n";
    omniORB::log.flush();
  }
  if (pd_socket != RC_INVALID_SOCKET)
    CLOSESOCKET(pd_socket);
  pd_socket = RC_INVALID_SOCKET;
  if (pd_delay_connect)
    delete pd_delay_connect;
  pd_delay_connect = 0;
}

size_t
tcpSocketStrand::ll_recv(void* buf, size_t sz)
{
  if (pd_delay_connect) {
    // We have not connect to the remote host yet. Do the connect now.
    // Note: May block on connect for sometime if the remote host is down
    //
    if ((pd_socket = realConnect(pd_delay_connect)) == RC_INVALID_SOCKET) {
      _setStrandIsDying();
      throw CORBA::COMM_FAILURE(errno,CORBA::COMPLETED_NO);
    }
    delete pd_delay_connect;
    pd_delay_connect = 0;
  }

  int rx;
  while (1) {
    if ((rx = ::recv(pd_socket,(char*)buf,sz,0)) == RC_SOCKET_ERROR) {
      if (errno == EINTR)
	continue;
      else
	{
	  _setStrandIsDying();
	  throw CORBA::COMM_FAILURE(errno,CORBA::COMPLETED_MAYBE);
	}
    }
    else
      if (rx == 0) {
	_setStrandIsDying();
	throw CORBA::COMM_FAILURE(0,CORBA::COMPLETED_MAYBE);
      }
    break;
  }
  return (size_t)rx;
}

void
tcpSocketStrand::ll_send(void* buf,size_t sz) 
{
  if (pd_delay_connect) {
    // We have not connect to the remote host yet. Do the connect now.
    // Note: May block on connect for sometime if the remote host is down
    //
    if ((pd_socket = realConnect(pd_delay_connect)) == RC_INVALID_SOCKET) {
      _setStrandIsDying();
      throw CORBA::COMM_FAILURE(errno,CORBA::COMPLETED_NO);
    }
    delete pd_delay_connect;
    pd_delay_connect = 0;
  }

  int tx;
  char *p = (char *)buf;
  while (sz) {
    if ((tx = ::send(pd_socket,p,sz,0)) == RC_SOCKET_ERROR) {
      if (errno == EINTR)
	continue;
      else {
	_setStrandIsDying();
	throw CORBA::COMM_FAILURE(errno,CORBA::COMPLETED_MAYBE);
      }
    }
    else
      if (tx == 0) {
	_setStrandIsDying();
	throw CORBA::COMM_FAILURE(0,CORBA::COMPLETED_MAYBE);
      }
    sz -= tx;
    p += tx;
  }
  return;
}



void
tcpSocketStrand::shutdown()
{
  if (pd_send_giop_closeConnection)
    {
      // XXX This is a bit ugly. GIOP requires us to send a CloseConnection 
      // message before shutdown. Ideally, we do not want this abstraction to 
      // do any GIOP dependent stuff. If this a problem in future, we should 
      // perhap make it a parameter to decide whether or what to send on
      // shutdown.

      static char closeConnectionMessage[12] = {
	   'G','I','O','P',
	   1,0,
	   _OMNIORB_HOST_BYTE_ORDER_,
	   GIOP::CloseConnection,
	   0,0,0,0
      };

      size_t sz = sizeof(closeConnectionMessage);
      char* p = closeConnectionMessage;
      while (sz) {
	fd_set wrfds;
	FD_ZERO(&wrfds);
	FD_SET(pd_socket,&wrfds);
	struct timeval t = { 5,0};
	int rc;
	if ((rc = select(pd_socket+1,0,&wrfds,0,&t)) <= 0) {
	  // Any timeout or error, we just don't border sending the message.
	  break;
	}
	int tx;
	if ((tx = ::send(pd_socket,p,sz,0)) == RC_SOCKET_ERROR) {
	  // Any error we just don't border sending anymore.
	  break;
	}
	sz -= tx;
	p += tx;
      }
    }
  _setStrandIsDying();
  SHUTDOWNSOCKET(pd_socket);
  return;
}

static
tcpSocketHandle_t
realConnect(tcpSocketEndpoint* r)
{
  struct sockaddr_in raddr;
  LibcWrapper::hostent_var h;
  int  rc;
  tcpSocketHandle_t sock;

  if (! LibcWrapper::isipaddr( (char*) r->host()))
    {
      if (LibcWrapper::gethostbyname((char *)r->host(),h,rc) < 0) 
	{
	  // XXX look at rc to decide what to do or if to give up what errno
	  // XXX to return EINVAL.
	  //
	  return RC_INVALID_SOCKET;
	}
      // We just pick the first address in the list, may be we should go
      // through the list and if possible pick the one that is on the same
      // subnet.
      memcpy((void*)&raddr.sin_addr,
	     (void*)h.hostent()->h_addr_list[0],
	     sizeof(raddr.sin_addr));
    }
  else
    {
      // The machine name is already an IP address
      CORBA::ULong ip_p;
      if ( (ip_p = inet_addr( (char*) r->host() )) == RC_INADDR_NONE)
	{
	  return RC_INVALID_SOCKET;
	}
      memcpy((void*) &raddr.sin_addr, (void*) &ip_p, sizeof(raddr.sin_addr));
    }

  raddr.sin_family = INETSOCKET;
  raddr.sin_port   = htons(r->port());

  if ((sock = socket(INETSOCKET,SOCK_STREAM,0)) == RC_INVALID_SOCKET) {
    return RC_INVALID_SOCKET;
  }

#if defined(__sunos__) && defined(__sparc__) && __OSVERSION__ >= 5
  // Use non-blocking connect.
  int fl = O_NONBLOCK;
  if (fcntl(sock,F_SETFL,fl) < RC_SOCKET_ERROR) {
    CLOSESOCKET(sock);
    return RC_INVALID_SOCKET;
  }
  if (connect(sock,(struct sockaddr *)&raddr,
	      sizeof(struct sockaddr_in)) == RC_SOCKET_ERROR) 
  {
    if (errno != EINPROGRESS) {
      CLOSESOCKET(sock);
      return RC_INVALID_SOCKET;
    }
    fd_set wrfds;
    FD_ZERO(&wrfds);
    FD_SET(sock,&wrfds);
    struct timeval t = { 30,0 };
    int rc;
    if ((rc = select(sock+1,0,&wrfds,0,&t)) <= 0) {
      // Timeout, do not bother trying again.
      CLOSESOCKET(sock);
      return RC_INVALID_SOCKET;
    }
  }
  // Set the socket back to blocking
  fl = 0;
  if (fcntl(sock,F_SETFL,fl) == RC_SOCKET_ERROR) {
    CLOSESOCKET(sock);
    return RC_INVALID_SOCKET;
  }

#else
  if (connect(sock,(struct sockaddr *)&raddr,
	      sizeof(struct sockaddr_in)) == RC_SOCKET_ERROR) 
  {
    CLOSESOCKET(sock);
    return RC_INVALID_SOCKET;
  }
#endif


  return sock;
}

/////////////////////////////////////////////////////////////////////////////


#if defined(__sunos__) && defined(__sparc__) && __OSVERSION__ >= 5

#include <signal.h>
extern "C" void abort()
{
  kill (getpid(),SIGABRT);
  while (1) {
    sleep(1000000);
  }
}

typedef void (*PFV)();
extern PFV set_terminate(PFV);

#endif

void*
tcpSocketRendezvouser::run_undetached(void *arg)
{
  tcpSocketIncomingRope* r = (tcpSocketIncomingRope*) arg;

#if defined(__sunos__) && defined(__sparc__) && __OSVERSION__ >= 5
  set_terminate(abort);
#endif
  if (omniORB::traceLevel >= 5) {
    omniORB::log << "tcpSocketMT Rendezvouser thread: starts.\n";
    omniORB::log.flush();
  }

  tcpSocketStrand *newSt = 0;
  tcpSocketWorker *newthr = 0;
  CORBA::Boolean   die = 0;

  while (r->pd_shutdown == tcpSocketIncomingRope::ACTIVE  && !die) {

    try {

      tcpSocketHandle_t new_sock;
      struct sockaddr_in raddr;
 
#if (defined(__GLIBC__) && __GLIBC__ >= 2)
      // GNU C library uses socklen_t * instead of int* in accept ().
      // This is suppose to be compatible with the upcoming POSIX standard.
      socklen_t l;
#elif defined(__aix__) || defined(__VMS) || defined(__SINIX__)
    size_t l;
#else
    int l;
#endif

      l = sizeof(struct sockaddr_in);

      if (omniORB::traceLevel >= 15) {
	omniORB::log << "tcpSocketMT Rendezvouser thread: block on accept().\n";
	omniORB::log.flush();
      }

      if ((new_sock = ::accept(r->pd_rendezvous,(struct sockaddr *)&raddr,&l)) 
	                          == RC_INVALID_SOCKET) {
	throw CORBA::COMM_FAILURE(errno,CORBA::COMPLETED_NO);
      }

      if (omniORB::traceLevel >= 15) {
	omniORB::log << "tcpSocketMT Rendezvouser thread: unblock from accept().\n";
	omniORB::log.flush();
      }

      {
	omni_mutex_lock sync(r->pd_lock);

	if (r->pd_shutdown != tcpSocketIncomingRope::ACTIVE) {
	  // It has been indicated that this thread should stop
	  // accepting connection request.
	  CLOSESOCKET(new_sock);
	  continue;
	}

	newSt = new tcpSocketStrand(r,new_sock,1);
	newSt->incrRefCount(1);
      }

      if (omniORB::traceLevel >= 5) {
	omniORB::log << "tcpSocketMT Rendezvouser thread: accept new strand.\n";
	omniORB::log.flush();
      }

      try {
	newthr = new tcpSocketWorker(newSt);
      }
      catch(...) {
	newthr = 0;
      }
      if (!newthr) {
	// Cannot create a new thread to serve the strand
	// We have no choice but to shutdown the strand.
	// The long term solutions are:  start multiplexing the new strand
	// and the rendezvous; close down idle connections; reasign
	// threads to strands; etc.
	newSt->decrRefCount();
	newSt->shutdown();
      }
    }
    catch(const CORBA::COMM_FAILURE &) {
      // XXX accepts failed. The probable cause is that the number of
      //     file descriptors opened has exceeded the limit.
      //     On unix, the value of this limit can be set and get using the
      //              ulimit command.
      //     On NT, if this is part of a DLL, the limit is 256(?)
      //            else the limit is 16(?)
      // The following is a temporary fix, this thread just wait for a while
      // and tries again. Hopfully, some connections might be freed by then.
      if (omniORB::traceLevel >= 5) {
	omniORB::log << "tcpSocketMT Rendezvouser thread: accept fails. Too many file descriptors opened?\n";
	omniORB::log.flush();
      }
      omni_thread::sleep(1,0);
      continue;
    }
    catch(const omniORB::fatalException &ex) {
      if (omniORB::traceLevel > 0) {
	omniORB::log << "#### You have caught an omniORB2 bug, details are as follows:\n"
		     << ex.file() << " " << ex.line() << ":" << ex.errmsg()
		     << "\n"
		     << "tcpSocketMT Rendezvouser thread will not accept new connection.\n";
	omniORB::log.flush();
      }
      die = 1;
    }
    catch(...) {
      if (omniORB::traceLevel > 0) {
	omniORB::log << "######## Unexpected exception caught by tcpSocketMT Rendezvouser\n"
		     << "tcpSocketMT Rendezvouser thread will not accept new connection.\n";
	omniORB::log.flush();
      }
      die = 1;
    }
    if (die && newSt) {
      newSt->decrRefCount();
      newSt->shutdown();
      if (!newthr) {
	if (omniORB::traceLevel >= 5) {
	  omniORB::log << "tcpSocketMT Rendezvouser thread cannot spawn a new server thread.\n";
	  omniORB::log.flush();
	}
      }
    }
  }
  if (die) {
    // Something very wrong has happened, before we quit, we have to
    // make sure that a future call by another thread to
    // tcpSocketIncomingRope::cancelThreads() would not wait indefinitely
    // on this thread to response to its connect() request to the
    // rendezous socket. 
    // Shutdown (not close) the rendezvous socket to make sure that the
    // connect() in cancelThreads() would fail.
    SHUTDOWNSOCKET(r->pd_rendezvous);
  }

  while (r->pd_shutdown != tcpSocketIncomingRope::NO_THREAD) {

    // We keep on accepting connection requests but close the new sockets
    // immediately until the state of pd_shutdown changes to NO_THREAD.
    // This is to make sure that the thread calling cancelThreads()
    // will be unblocked from the connect() call.

    {
      fd_set rdfds;
      FD_ZERO(&rdfds);
      FD_SET(r->pd_rendezvous,&rdfds);
      struct timeval t = { 1,0};
      int rc;
      if ((rc = select(r->pd_rendezvous+1,&rdfds,0,0,&t)) <= 0) {
	if (rc < 0 && errno != EINTR) {
	  die = 1;
	}
	if (omniORB::traceLevel >= 15) {
	  omniORB::log << "tcpSocketMT Rendezvouser thread: waiting on shutdown state to change to NO_THREAD.\n";
	  omniORB::log.flush();
	}
	continue;
      }
    }

    tcpSocketHandle_t new_sock;
    struct sockaddr_in raddr;
#if (defined(__GLIBC__) && __GLIBC__ >= 2)
    // GNU C library uses socklen_t * instead of int* in accept ().
    // This is suppose to be compatible with the upcoming POSIX standard.
    socklen_t l;
#elif defined(__aix__) || defined(__VMS) || defined(__SINIX__)
    size_t l;
#else
    int l;
#endif

    l = sizeof(struct sockaddr_in);
    if ((new_sock = ::accept(r->pd_rendezvous,(struct sockaddr *)&raddr,&l)) 
	      == RC_INVALID_SOCKET) 
      {
	die = 1;
	continue;
      }
    CLOSESOCKET(new_sock);
  }

  if (omniORB::traceLevel >= 5) {
    omniORB::log << "tcpSocketMT Rendezvouser thread: exits.\n";
    omniORB::log.flush();
  }
  return 0;
}

void
tcpSocketWorker::run(void *arg)
{
  omniORB::giopServerThreadWrapper::
        getGiopServerThreadWrapper()->run(tcpSocketWorker::_realRun,arg);
  // the wrapper run() method will pass back control to tcpSocketWorker
  // by calling  _realRun(arg) when it is ready.
}

void
tcpSocketWorker::_realRun(void *arg)
{
  tcpSocketStrand* s = (tcpSocketStrand*)arg;

#if defined(__sunos__) && defined(__sparc__) && __OSVERSION__ >= 5
  set_terminate(abort);
#endif
  
  if (omniORB::traceLevel >= 5) {
    omniORB::log << "tcpSocketMT Worker thread: starts.\n";
    omniORB::log.flush();
  }

  if (!gateKeeper::checkConnect(s)) {
    s->shutdown();
  }
  else {
    while (1) {
      try {
	GIOP_S::dispatcher(s);
      }
      catch (const CORBA::COMM_FAILURE &) {
	if (omniORB::traceLevel >= 5) {
	  omniORB::log << "#### Communication failure. Connection closed.\n";
	  omniORB::log.flush();
	}
	break;
      }
      catch(const omniORB::fatalException &ex) {
	if (omniORB::traceLevel > 0) {
	  omniORB::log << "#### You have caught an omniORB2 bug, details are as follows:\n"
		       << ex.file() << " " << ex.line() << ":" << ex.errmsg() << "\n";
	  omniORB::log.flush();
	}
	break;
      }
      catch (...) {
	if (omniORB::traceLevel > 0) {
	  omniORB::log << "#### A system exception has occured and was caught by tcpSocketMT Worker thread.\n";
	  omniORB::log.flush();
	}
	break;
      }
    }
  }
  if (omniORB::traceLevel >= 5) {
    omniORB::log << "tcpSocketMT Worker thread: exits.\n";
    omniORB::log.flush();
  }
}
