linuxplatformutils.cpp

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/*
 * Copyright 1999-2004 The Apache Software Foundation.
 * 
 * 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.
 */

/*
 * $Log: LinuxPlatformUtils.cpp,v $
 * Revision 1.24  2004/09/08 13:56:40  peiyongz
 * Apache License Version 2.0
 *
 * Revision 1.23  2004/05/05 17:37:12  amassari
 * Enable libWWW on Linux
 *
 * Revision 1.22  2004/01/13 16:34:21  cargilld
 * Misc memory management changes.
 *
 * Revision 1.21  2004/01/06 17:31:20  neilg
 * fix static initialization problems, bug 28517; thanks to Reid Spencer
 *
 * Revision 1.20  2003/12/24 15:24:14  cargilld
 * More updates to memory management so that the static memory manager.
 *
 * Revision 1.19  2003/12/17 15:16:10  cargilld
 * Platform update for memory management so that the static memory manager (one
 * used to call Initialize) is only for static data.
 *
 * Revision 1.18  2003/12/17 13:58:03  cargilld
 * Platform update for memory management so that the static memory manager (one
 * used to call Initialize) is only for static data.
 *
 * Revision 1.17  2003/10/01 16:32:39  neilg
 * improve handling of out of memory conditions, bug #23415.  Thanks to David Cargill.
 *
 * Revision 1.16  2003/05/15 18:37:48  knoaman
 * Partial implementation of the configurable memory manager.
 *
 * Revision 1.15  2003/04/25 17:19:53  peiyongz
 * throw exception if getcwd() fails
 *
 * Revision 1.14  2003/04/24 02:54:46  peiyongz
 * Logical Path Resolution
 *
 * Revision 1.13  2003/04/21 04:28:45  peiyongz
 * performance tuning
 *
 * Revision 1.12  2003/03/09 16:56:11  peiyongz
 * PanicHandler
 *
 * Revision 1.11  2003/02/05 18:27:34  tng
 * [Bug 13437] Incorrect memory management in LinuxPlatformUtils.cpp.  Fixed by Adam Zell.
 *
 * Revision 1.10  2002/12/02 19:16:46  tng
 * [Bug 14723] Memory leak in atomicOpsMutex.  Patch from Adam Zell.
 *
 * Revision 1.9  2002/11/07 22:38:13  peiyongz
 * build -miconv on hpux and linux
 *
 * Revision 1.8  2002/11/04 15:13:00  tng
 * C++ Namespace Support.
 *
 * Revision 1.7  2002/08/19 19:38:17  tng
 * [Bug 11771] Linux specific IconvGNU transcoder.  Patch from Vasily Tchekalkin.
 *
 * Revision 1.6  2002/07/15 21:53:04  peiyongz
 * CouldNotWriteToFile
 *
 * Revision 1.5  2002/06/24 15:55:21  peiyongz
 * Change from James Berry( [e-mail])
 *
 * Revision 1.4  2002/06/20 15:28:08  peiyongz
 * Fix to compilation error
 *
 * Revision 1.2  2002/05/21 20:31:47  tng
 * Minor update: Remove obsolete code
 *
 * Revision 1.1.1.1  2002/02/01 22:22:24  peiyongz
 * sane_include
 *
 * Revision 1.22  2001/10/25 15:36:35  tng
 * [Bug 4318] Single threaded build fails due to obsolete #define .
 *
 * Revision 1.21  2001/10/25 15:20:31  tng
 * Need to guard with NO_APP_THREADS when destroying the mutex.
 *
 * Revision 1.20  2001/10/23 23:10:48  peiyongz
 * [Bug#880] patch to PlatformUtils:init()/term() and related. from Mark Weaver
 *
 * Revision 1.19  2001/05/11 12:03:40  tng
 * Need to add header <linux/limits> for definition of PATH_MAX
 *
 * Revision 1.18  2001/05/10 20:40:44  lehors
 * built-in buffer limit could be smaller than system limit,
 * we now use PATH_MAX instead - patch from Christian Schuhegger - bug #1158
 *
 * Revision 1.17  2000/07/25 22:29:55  aruna1
 * Char definitions in XMLUni moved to XMLUniDefs
 *
 * Revision 1.16  2000/03/24 00:13:03  aruna1
 * Platform initialization taken care for both threaded and non-threaded environment
 *
 * Revision 1.15  2000/03/20 23:48:52  rahulj
 * Added Socket based NetAccessor. This will enable one to
 * use HTTP URL's for system id's. Default build options do
 * not use this NetAccessor. Specify the '-n socket' option
 * to 'runConfigure' to configure Xerces-C to use this new
 * feature. The code works under Solaris 2.6, Linux, AIX
 * and HPUX 11 with aCC.
 * Todo's: enable proper error handling.
 *
 * Revision 1.14  2000/03/18 00:00:00  roddey
 * Initial updates for two way transcoding support
 *
 * Revision 1.13  2000/03/02 21:10:36  abagchi
 * Added empty function platformTerm()
 *
 * Revision 1.12  2000/03/02 20:42:41  abagchi
 * Fixed typo in XMLExcepts
 *
 * Revision 1.11  2000/03/02 19:55:24  roddey
 * This checkin includes many changes done while waiting for the
 * 1.1.0 code to be finished. I can't list them all here, but a list is
 * available elsewhere.
 *
 * Revision 1.10  2000/02/22 00:58:15  aruna1
 * openFile API updated
 *
 * Revision 1.9  2000/02/06 07:48:28  rahulj
 * Year 2K copyright swat.
 *
 * Revision 1.8  2000/01/25 22:32:56  aruna1
 * Updated panic information
 *
 * Revision 1.7  2000/01/19 23:21:37  abagchi
 * Made this file compatible with ICU 1.4
 *
 * Revision 1.6  2000/01/19 17:37:48  abagchi
 * Removed the streaming classes
 *
 * Revision 1.5  2000/01/14 02:04:43  abagchi
 * Introduced getFullPath() and weavePath()
 *
 * Revision 1.4  1999/12/14 23:53:33  rahulj
 * Removed the offending Ctrl-M's from the commit message
 * logs which was giving packaging problems.
 *
 * PR:
 * Obtained from:
 * Submitted by:
 * Reviewed by:
 *
 * Revision 1.3  1999/11/23 02:00:48  rahulj
 * Code now works under HPUX 11. Tested inmemory message loader.
 * Revamped makefiles. Builds with both DCE threads as well as pthread libraries.
 *
 * Revision 1.2  1999/11/17 22:35:33  rahulj
 * Replaced default attr mutexes with recursive mutexes. Also code works with ICU transcoding service
 *
 * Revision 1.1.1.1  1999/11/09 01:07:01  twl
 * Initial checkin
 *
 * Revision 1.6  1999/11/08 20:45:30  rahul
 * Swat for adding in Product name and CVS comment log variable.
 *
 */


// ---------------------------------------------------------------------------
//  Includes
// ---------------------------------------------------------------------------

#if !defined(APP_NO_THREADS)
#include    <pthread.h>
#endif

#ifndef _GNU_SOURCE
    #error _GNU_SOURCE is not defined in your compile settings
#endif

#include    <unistd.h>
#include    <stdio.h>
#include    <stdlib.h>
#include    <errno.h>
#include    <libgen.h>
#include    <linux/limits.h>           //for PATH_MAX
#include    <sys/timeb.h>
#include    <string.h>
#include    <xercesc/util/PlatformUtils.hpp>
#include    <xercesc/util/RuntimeException.hpp>
#include    <xercesc/util/Janitor.hpp>
#include    <xercesc/util/Mutexes.hpp>
#include    <xercesc/util/XMLString.hpp>
#include    <xercesc/util/XMLUniDefs.hpp>
#include    <xercesc/util/XMLUni.hpp>
#include    <xercesc/util/PanicHandler.hpp>
#include    <xercesc/util/OutOfMemoryException.hpp>

#if defined(XML_USE_ICU_TRANSCODER)
    #include <xercesc/util/Transcoders/ICU/ICUTransService.hpp>
#elif defined (XML_USE_GNU_TRANSCODER)
    #include <xercesc/util/Transcoders/IconvGNU/IconvGNUTransService.hpp>
#else
    // Use native transcoder. Same as -DXML_USE_NATIVE_TRANSCODER
    #include <xercesc/util/Transcoders/Iconv/IconvTransService.hpp>
#endif


#if defined(XML_USE_ICU_MESSAGELOADER)
    #include <xercesc/util/MsgLoaders/ICU/ICUMsgLoader.hpp>
#elif defined (XML_USE_ICONV_MESSAGELOADER)
    #include <xercesc/util/MsgLoaders/MsgCatalog/MsgCatalogLoader.hpp>
#else
    // Same as -DXML_USE_INMEM_MESSAGELOADER
    #include <xercesc/util/MsgLoaders/InMemory/InMemMsgLoader.hpp>
#endif


#if defined (XML_USE_NETACCESSOR_SOCKET)
    #include <xercesc/util/NetAccessors/Socket/SocketNetAccessor.hpp>
#elif defined (XML_USE_NETACCESSOR_LIBWWW)
    #include <xercesc/util/NetAccessors/libWWW/LibWWWNetAccessor.hpp>
#endif


XERCES_CPP_NAMESPACE_BEGIN

// ---------------------------------------------------------------------------
//  XMLPlatformUtils: Private Static Methods
// ---------------------------------------------------------------------------

XMLNetAccessor* XMLPlatformUtils::makeNetAccessor()
{
#if defined (XML_USE_NETACCESSOR_SOCKET)
    return new SocketNetAccessor();
#elif defined (XML_USE_NETACCESSOR_LIBWWW)
    return new LibWWWNetAccessor();
#else
    return 0;
#endif
}



//
//  This method is called by the platform independent part of this class
//  when client code asks to have one of the supported message sets loaded.
//

XMLMsgLoader* XMLPlatformUtils::loadAMsgSet(const XMLCh* const msgDomain)
{
    XMLMsgLoader* retVal;
    try
    {
#if defined (XML_USE_ICU_MESSAGELOADER)
        retVal = new ICUMsgLoader(msgDomain);
#elif defined (XML_USE_ICONV_MESSAGELOADER)
        retVal = new MsgCatalogLoader(msgDomain);
#else
        // same as -DXML_USE_INMEM_MESSAGELOADER
        retVal = new InMemMsgLoader(msgDomain);
#endif
    }
    catch(const OutOfMemoryException&)
    {
        throw;
    }
    catch(...)
    {
        panic(PanicHandler::Panic_CantLoadMsgDomain);
    }
    return retVal;
}


//
//  This method is called very early in the bootstrapping process. This guy
//  must create a transcoding service and return it. It cannot use any string
//  methods, any transcoding services, throw any exceptions, etc... It just
//  makes a transcoding service and returns it, or returns zero on failure.
//

XMLTransService* XMLPlatformUtils::makeTransService()
{
#if defined (XML_USE_ICU_TRANSCODER)
    // Use ICU transcoding services.
    // same as -DXML_USE_ICU_MESSAGELOADER
    return new ICUTransService;
#elif defined (XML_USE_GNU_TRANSCODER)
    return new IconvGNUTransService;
#else
    // Use native transcoding services.
    // same as -DXML_USE_NATIVE_TRANSCODER
    return new IconvTransService;

#endif
}

// ---------------------------------------------------------------------------
//  XMLPlatformUtils: The panic method
// ---------------------------------------------------------------------------
void XMLPlatformUtils::panic(const PanicHandler::PanicReasons reason)
{
    fgUserPanicHandler? fgUserPanicHandler->panic(reason) : fgDefaultPanicHandler->panic(reason);	
}


// ---------------------------------------------------------------------------
//  XMLPlatformUtils: File Methods
// ---------------------------------------------------------------------------

unsigned int XMLPlatformUtils::curFilePos(FileHandle theFile
                                          , MemoryManager* const manager)
{
    int curPos = ftell( (FILE*)theFile);
    if (curPos == -1)
        ThrowXMLwithMemMgr(XMLPlatformUtilsException,
                 XMLExcepts::File_CouldNotGetSize, manager);

    return (unsigned int)curPos;
}

void XMLPlatformUtils::closeFile(FileHandle theFile
                                 , MemoryManager* const manager)
{
    if (fclose((FILE*)theFile))
        ThrowXMLwithMemMgr(XMLPlatformUtilsException,
                 XMLExcepts::File_CouldNotCloseFile, manager);
}

unsigned int XMLPlatformUtils::fileSize(FileHandle theFile
                                        , MemoryManager* const manager)
{
    // Get the current position
    long  int curPos = ftell((FILE*) theFile);
    if (curPos == -1)
        ThrowXMLwithMemMgr(XMLPlatformUtilsException,
                 XMLExcepts::File_CouldNotGetCurPos, manager);

    // Seek to the end and save that value for return
     if (fseek((FILE*) theFile, 0, SEEK_END))
        ThrowXMLwithMemMgr(XMLPlatformUtilsException,
                 XMLExcepts::File_CouldNotSeekToEnd, manager);

    long int retVal = ftell((FILE*)theFile);
    if (retVal == -1)
        ThrowXMLwithMemMgr(XMLPlatformUtilsException,
                 XMLExcepts::File_CouldNotSeekToEnd, manager);

    // And put the pointer back

    if (fseek( (FILE*)theFile, curPos, SEEK_SET) )
        ThrowXMLwithMemMgr(XMLPlatformUtilsException,