qlibrary_unix.cpp

Trolltech公司发布的图形界面操作系统。可在qt-embedded-2.3.10平台上编译为嵌入式图形界面操作系统。

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** Copyright (C) 2000-2005 Trolltech AS.  All rights reserved.
**
** This file is part of the Qtopia Environment.
** 
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** under the terms of the GNU General Public License as published by the
** Free Software Foundation; either version 2 of the License, or (at your
** option) any later version.
** 
** A copy of the GNU GPL license version 2 is included in this package as 
** LICENSE.GPL.
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** WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
** See the GNU General Public License for more details.
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** the code of this program with Qtopia applications copyrighted, developed
** and distributed by Trolltech under the terms of the Qtopia Personal Use
** License Agreement. You must comply with the GNU General Public License
** in all respects for all of the code used other than the applications
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#if !defined(QT_NO_COMPONENT)
#include "qlibrary_p.h"

/*
  The platform dependent implementations of
  - loadLibrary
  - freeLibrary
  - resolveSymbol

  It's not too hard to guess what the functions do.
*/
#if defined(Q_OS_HPUX)
// for HP-UX < 11.x and 32 bit
#include <dl.h>

bool QLibraryPrivate::loadLibrary()
{
    if ( pHnd )
	return TRUE;

    QString filename = library->library();

    pHnd = (void*)shl_load( filename.latin1(), BIND_DEFERRED | BIND_NONFATAL | DYNAMIC_PATH, 0 );
#if defined(QT_DEBUG) || defined(QT_DEBUG_COMPONENT)
    if ( !pHnd )
	qDebug( "Failed to load library %s!", filename.latin1() );
#endif
    return pHnd != 0;
}

bool QLibraryPrivate::freeLibrary()
{
    if ( !pHnd )
	return TRUE;

    if ( !shl_unload( (shl_t)pHnd ) ) {
	pHnd = 0;
	return TRUE;
    }
    return FALSE;
}

void* QLibraryPrivate::resolveSymbol( const char* symbol )
{
    if ( !pHnd )
	return 0;

    void* address = 0;
    if ( shl_findsym( (shl_t*)&pHnd, symbol, TYPE_UNDEFINED, address ) < 0 ) {
#if defined(QT_DEBUG) || defined(QT_DEBUG_COMPONENT)
	qDebug( "Couldn't resolve symbol \"%s\"", symbol );
#endif
	return 0;
    }
    return address;
}

#else // Q_OS_HPUX
// Something else, assuming POSIX
#include <dlfcn.h>

bool QLibraryPrivate::loadLibrary()
{
    if ( pHnd )
	return TRUE;

    QString filename = library->library();

    pHnd = dlopen( filename.latin1() , RTLD_LAZY );
    if ( !pHnd )
	qWarning( "%s", dlerror() );
    return pHnd != 0;
}

bool QLibraryPrivate::freeLibrary()
{
    if ( !pHnd )
	return TRUE;

    int ec = dlclose( pHnd );
    if ( !ec )
	pHnd = 0;
#if defined(QT_DEBUG) || defined(QT_DEBUG_COMPONENT)
    else {
	const char* error = dlerror();
	if ( error )
	    qWarning( "%s", error );
    }
#endif
    return pHnd == 0;
}

void* QLibraryPrivate::resolveSymbol( const char* f )
{
    if ( !pHnd )
	return 0;

    void* address = dlsym( pHnd, f );
#if defined(QT_DEBUG) || defined(QT_DEBUG_COMPONENT)
    const char* error = dlerror();
    if ( error )
	qWarning( "%s", error );
#endif
    return address;
}

#endif // POSIX

#endif