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BUG#: 5356
TITLE: Consolidate reference counting logic in DynamicLibrary
DESCRIPTION: Move the load/unload counting logic from the provider managers to the DynamicLibrary class.  Also, consolidate DynamicLibraryUnix.cpp and DynamicLibraryVms.cpp into DynamicLibraryPOSIX.cpp.

//%2006////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2000, 2001, 2002 BMC Software; Hewlett-Packard Development
// Company, L.P.; IBM Corp.; The Open Group; Tivoli Systems.
// Copyright (c) 2003 BMC Software; Hewlett-Packard Development Company, L.P.;
// IBM Corp.; EMC Corporation, The Open Group.
// Copyright (c) 2004 BMC Software; Hewlett-Packard Development Company, L.P.;
// IBM Corp.; EMC Corporation; VERITAS Software Corporation; The Open Group.
// Copyright (c) 2005 Hewlett-Packard Development Company, L.P.; IBM Corp.;
// EMC Corporation; VERITAS Software Corporation; The Open Group.
// Copyright (c) 2006 Hewlett-Packard Development Company, L.P.; IBM Corp.;
// EMC Corporation; Symantec Corporation; The Open Group.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// THE ABOVE COPYRIGHT NOTICE AND THIS PERMISSION NOTICE SHALL BE INCLUDED IN
// ALL COPIES OR SUBSTANTIAL PORTIONS OF THE SOFTWARE. THE SOFTWARE IS PROVIDED
// "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
// LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
// ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
//==============================================================================
//
// Author: Chip Vincent (cvincent@us.ibm.com)
//
// Modified By:
//
//%/////////////////////////////////////////////////////////////////////////////

#include "DynamicLibrary.h"

#if defined(PEGASUS_OS_HPUX) || defined(PEGASUS_OS_LINUX) || defined(PEGASUS_OS_SOLARIS) || defined(PEGASUS_OS_AIX) || defined(PEGASUS_OS_TRU64) || defined(PEGASUS_OS_DARWIN)
#include <dlfcn.h>
#elif defined(PEGASUS_OS_OS400)
#include <fcntl.h>
#include <unistd.cleinc>
#include "OS400SystemState.h"  // OS400LoadDynamicLibrary, etc
#elif defined(PEGASUS_ZOS_SECURITY)
#include <sys/stat.h>
#include "DynamicLibraryzOS_inline.h"
#endif
#ifdef PEGASUS_PLATFORM_ZOS_ZSERIES_IBM
#define _UNIX03_SOURCE
#include <dlfcn.h>
#endif

PEGASUS_NAMESPACE_BEGIN

Boolean DynamicLibrary::load()
{
    // ensure the module is not already loaded
    PEGASUS_ASSERT(isLoaded() == false);

    CString cstr = _fileName.getCString();

    #if defined(PEGASUS_OS_HPUX) || defined(PEGASUS_OS_LINUX) || defined(PEGASUS_OS_SOLARIS) || defined(PEGASUS_OS_AIX) || defined(PEGASUS_OS_TRU64) || defined(PEGASUS_OS_DARWIN) 
    _handle = dlopen(cstr, RTLD_NOW);
    #elif defined(PEGASUS_OS_ZOS)
	#if defined(PEGASUS_ZOS_SECURITY)
	if (hasProgramControl(cstr))
	{
        _handle = dlopen(cstr, RTLD_LAZY);
	} else _handle = 0;
	#else
      _handle = dlopen(cstr, RTLD_LAZY);
	#endif

    #elif defined(PEGASUS_OS_OS400)
    _handle = OS400_LoadDynamicLibrary((const char *)cstr);
    #endif

    if (_handle == 0)
    {
        // Record the load error message
#if defined(PEGASUS_OS_OS400)
        _loadErrorMessage = String(OS400_DynamicLoadError());
#else
        _loadErrorMessage = dlerror();
#endif
    }

    return(isLoaded());
}

Boolean DynamicLibrary::unload()
{
    // ensure the module is loaded
    PEGASUS_ASSERT(isLoaded() == true);

    #ifdef PEGASUS_OS_OS400
    OS400_UnloadDynamicLibrary(_handle);    
    #else
    dlclose(_handle);
    #endif

    _handle = 0;
    _loadErrorMessage.clear();

    return(isLoaded());
}

Boolean DynamicLibrary::isLoaded() const
{
    return(_handle != 0);
}

DynamicLibrary::LIBRARY_SYMBOL DynamicLibrary::getSymbol(const String & symbolName)
{
    LIBRARY_SYMBOL func = 0;

    if(isLoaded())
    {
        CString cstr = symbolName.getCString();

        #ifdef PEGASUS_OS_OS400
        func = (LIBRARY_SYMBOL)OS400_LoadDynamicSymbol(_handle, (const char *)cstr);
        #else
        func = (LIBRARY_SYMBOL)::dlsym(_handle, (const char *)cstr);
        #endif
    }

    return(func);
}

PEGASUS_NAMESPACE_END