linux_dll.cpp
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上传日期:2007-06-06
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- /* ***** BEGIN LICENSE BLOCK *****
- * Version: RCSL 1.0/RPSL 1.0
- *
- * Portions Copyright (c) 1995-2002 RealNetworks, Inc. All Rights Reserved.
- *
- * The contents of this file, and the files included with this file, are
- * subject to the current version of the RealNetworks Public Source License
- * Version 1.0 (the "RPSL") available at
- * http://www.helixcommunity.org/content/rpsl unless you have licensed
- * the file under the RealNetworks Community Source License Version 1.0
- * (the "RCSL") available at http://www.helixcommunity.org/content/rcsl,
- * in which case the RCSL will apply. You may also obtain the license terms
- * directly from RealNetworks. You may not use this file except in
- * compliance with the RPSL or, if you have a valid RCSL with RealNetworks
- * applicable to this file, the RCSL. Please see the applicable RPSL or
- * RCSL for the rights, obligations and limitations governing use of the
- * contents of the file.
- *
- * This file is part of the Helix DNA Technology. RealNetworks is the
- * developer of the Original Code and owns the copyrights in the portions
- * it created.
- *
- * This file, and the files included with this file, is distributed and made
- * available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS
- * FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- *
- * Technology Compatibility Kit Test Suite(s) Location:
- * http://www.helixcommunity.org/content/tck
- *
- * Contributor(s):
- *
- * ***** END LICENSE BLOCK ***** */
- #include "dllacces.h"
- #include <dlfcn.h>
- #include <signal.h>
- #include <stdio.h>
- #include "platform/unix/unix_dll_common.h"
- class LinuxDLLAccess : public DLLAccessImp
- {
- public:
- LinuxDLLAccess();
- virtual ~LinuxDLLAccess();
- virtual int Open(const char* dllName);
- virtual int Close() ;
- virtual void* GetSymbol(const char* symbolName);
- virtual const char* GetErrorStr() const;
- virtual char* CreateVersionStr(const char* dllName) const;
- virtual void CreateName(const char* short_name, const char* long_name,
- char* out_buf, UINT32& out_buf_len,
- UINT32 nMajor, UINT32 nMinor)
- {
- UnixCreateName(short_name, long_name, out_buf, out_buf_len,
- nMajor, nMinor);
- }
- private:
- void* m_handle;
- };
- LinuxDLLAccess::LinuxDLLAccess() :
- m_handle(0)
- {}
- LinuxDLLAccess::~LinuxDLLAccess()
- {
- if (m_handle)
- {
- Close();
- }
- }
- int LinuxDLLAccess::Open(const char* dllName)
- {
- int ret = DLLAccess::NO_LOAD;
- if (m_handle)
- {
- Close();
- }
-
- sigset_t newset, oldset;
- // block all signals, avoiding thread switch
- sigfillset(&newset);
- sigprocmask(SIG_SETMASK, &newset, &oldset);
- m_handle = dlopen(dllName, RTLD_LAZY);
- sigprocmask(SIG_SETMASK, &oldset, &newset);
- if (m_handle)
- {
- ret = DLLAccess::DLL_OK;
- }
- HandleHXStopOnLoad(dllName);
- return ret;
- }
- int LinuxDLLAccess::Close()
- {
- int ret = DLLAccess::NO_LOAD;
- if(m_handle)
- {
- //GCC 2.95 does not clean up any function scope statics until
- //the atexit handler is called. This raises the problem that
- //if you have such a static defined in a DLL, and the DLL is
- //unloaded before the end of the program, you will get a seg
- //fault when the atexit handler fires as it is trying to clean
- //up memory that is no longer around. GCC 3.2 does not have
- //this problem. So, for any GCC<3.2 we will not do a
- //dlclose(). Be aware that this will make your runtime memory
- //requirment higher as all DLLs can be queried and freed at
- //startup of different apps.
- #if defined(__GNUC__)
- #if (__GNUC__>3 || (__GNUC__==3 && __GNUC_MINOR__>=2))
- if (!dlclose(m_handle))
- {
- ret = DLLAccess::DLL_OK;
- }
- # else // GCC versin < 3
- ret = DLLAccess::DLL_OK;
- # endif
- #else // Not using gnu C compiler...
- if (!dlclose(m_handle))
- {
- ret = DLLAccess::DLL_OK;
- }
- #endif
- m_handle = 0;
- }
- return ret;
- }
- void* LinuxDLLAccess::GetSymbol(const char* symbolName)
- {
- return dlsym(m_handle, symbolName);
- }
- const char* LinuxDLLAccess::GetErrorStr() const
- {
- return dlerror();
- }
- char* LinuxDLLAccess::CreateVersionStr(const char* dllName) const
- {
- return UnixFindDLLVersion(dllName);
- }
- DLLAccessImp* DLLAccess::CreatePlatformDLLImp()
- {
- return new LinuxDLLAccess();
- }