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fdmover.h

/*
 * Copyright (c) 2000-2001,2003-2004 Apple Computer, Inc. All Rights Reserved.
 * 
 * @APPLE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
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 * @APPLE_LICENSE_HEADER_END@
 */


//
// fdmover - send/receive file descriptors over a UNIX domain socket connection
//
// An FdMover object is a very specialized Socket:
// It must be bound to a UNIX domain address
//
#ifndef _H_FDMOVER
#define _H_FDMOVER

#include "ip++.h"
#include <vector>

using namespace UnixPlusPlus;


namespace Security {
namespace IPPlusPlus {


// an ordered list of file descriptors
typedef std::vector<FileDesc> FdVector;


//
// An FdMover - a specialized Socket for transferring file descriptors
// across UNIX domain sockets.
//
class FdMover : public Socket {
private:
      class Element : public cmsghdr {
      public:
            void *operator new (size_t base, size_t more);
            void operator delete (void *addr, size_t size);
            
            Element() { }
            Element(int level, int type);
            
            template <class T> T &payload()     { return *reinterpret_cast<T *>(CMSG_DATA(this)); }
            size_t payloadSize() const          { return cmsg_len - ((caddr_t)CMSG_DATA(this) - (caddr_t)this); }
      };

      class Message : public msghdr {
      public:
            Message(const void *data, size_t length);
            void set(Element *elem);
            Element *element() const                  { return (Element *)msg_control; }
            Element *next(Element *elem) const  { return (Element *)CMSG_NXTHDR(this, elem); }
      
      public:
            IOVec iovec;
      };
      
public:
      FdMover() { }
      FdMover(Socket s) : Socket(s) { }

      size_t send(const void *data, size_t length, const FdVector &fds);
      size_t receive(void *data, size_t length, FdVector &fds);
      
private:
      
};


}     // end namespace IPPlusPlus
}     // end namespace Security


#endif //_H_FDMOVER

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