1 // Copyright (c) 1998-1999 Matra Datavision
2 // Copyright (c) 1999-2014 OPEN CASCADE SAS
4 // This file is part of Open CASCADE Technology software library.
6 // This library is free software; you can redistribute it and/or modify it under
7 // the terms of the GNU Lesser General Public License version 2.1 as published
8 // by the Free Software Foundation, with special exception defined in the file
9 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
10 // distribution for complete text of the license and disclaimer of any warranty.
12 // Alternatively, this file may be used under the terms of Open CASCADE
13 // commercial license or contractual agreement.
18 #include <OSD_Function.hxx>
19 #include <OSD_LoadMode.hxx>
20 #include <OSD_SharedLibrary.hxx>
23 #ifdef __some_crappy_system__
25 * Values for 'mode' argument in dlopen().
31 * Interface to rld via unsupported __rld_libdl_interface() call.
34 #define _LIBDL_RLD_DLOPEN 1
35 #define _LIBDL_RLD_DLCLOSE 2
36 #define _LIBDL_RLD_DLSYM 3
37 #define _LIBDL_RLD_DLERROR 4
38 extern "C" {void *dlopen(char *path, int mode);}
39 extern "C" {void* dlsym ( void* handle,char* name);}
40 extern "C" {int dlclose ( void *handle );}
41 extern "C" {void *dlerror (void);}
46 extern "C" {size_t strlen (const char* s );}
49 #define BAD(X) ((X) == NULL)
51 // ----------------------------------------------------------------
53 // Create and initialize a shared library object to NULL
55 // ----------------------------------------------------------------
56 OSD_SharedLibrary::OSD_SharedLibrary():myHandle(NULL),myName(NULL){
58 // ----------------------------------------------------------------
60 // Create and initialize a shared library object to the
61 // name given as argument
63 // ----------------------------------------------------------------
64 OSD_SharedLibrary::OSD_SharedLibrary(const Standard_CString aName):myHandle(NULL)
67 myName = new char [(strlen (aName) + 1 )];
68 strcpy (myName,aName);
71 // ----------------------------------------------------------------
73 // Name: Returns the shared library name
75 // ----------------------------------------------------------------
76 Standard_CString OSD_SharedLibrary::Name() const {
79 // ----------------------------------------------------------------
81 // SetName: Sets a name to a shared library object
83 // ----------------------------------------------------------------
84 void OSD_SharedLibrary::SetName(const Standard_CString aName) {
86 myName = new char [(strlen (aName) + 1 )];
87 strcpy (myName,aName);
90 // ----------------------------------------------------------------
92 // DlOpen: The dlopen function provides an interface to the dynamic
93 // library loader to allow shared libraries to be loaded and called at
95 // The dlopen function attempts to load filename, in the address space
96 // of the process, resolving symbols as appropriate. Any libraries that
97 // filename depends upon are also loaded.
99 // If mode is RTLD_LAZY, then the runtime loader does symbol resolution
100 // only as needed. Typically, this means that the first call
101 // to a function in the newly loaded library will cause the resolution
102 // of the address of that function to occur.
104 // If mode is RTLD_NOW, then the runtime loader must do all
105 // symbol binding during the dlopen call.
106 // The dlopen function returns a handle that is used by dlsym or
107 // dlclose call. If there is an error, a NULLpointer is returned.
109 // If a NULL filename is specified, dlopen returns a handle for the main
110 // executable, which allows access to dynamic symbols in the running program.
112 // ----------------------------------------------------------------
113 Standard_Boolean OSD_SharedLibrary::DlOpen(const OSD_LoadMode aMode ) {
114 if (aMode == OSD_RTLD_LAZY){
115 myHandle = dlopen (myName,RTLD_LAZY);
117 else if (aMode == OSD_RTLD_NOW){
118 myHandle = dlopen (myName,RTLD_NOW);
122 return Standard_True;
125 return Standard_False;
128 // ----------------------------------------------------------------
130 // DlSymb: The dlsym function returns the address of the
131 // symbol name found in the shared library corresponding to handle.
132 // If the symbol is not found, a NULL
133 // pointer is returned.
135 // ----------------------------------------------------------------
136 OSD_Function OSD_SharedLibrary::DlSymb(const Standard_CString aName )const{
138 fp = (void (*)()) dlsym (myHandle,aName);
140 return (OSD_Function)fp;
143 return (OSD_Function)NULL;
146 // ----------------------------------------------------------------
148 //DlClose: The dlclose function deallocates the address space for the library
149 //corresponding to handle. If any user function continues to call a symbol
150 //resolved in the address space of a library that has been since been deallo-
151 //cated by dlclose, the results are undefined.
153 // ----------------------------------------------------------------
154 void OSD_SharedLibrary::DlClose()const{
157 // ----------------------------------------------------------------
159 // DlError: returns a string describing the last error that
160 // occurred from a call to dlopen, dlclose or dlsym.
162 // ----------------------------------------------------------------
163 Standard_CString OSD_SharedLibrary::DlError()const{
164 return (char*) dlerror();
166 // ----------------------------------------------------------------------------
168 // ----------------------------------------------------------------------------
169 void OSD_SharedLibrary::Destroy() {
170 if (myName != NULL) {
179 //------------------------------------------------------------------------
180 //------------------- Windows NT sources for OSD_SharedLibrary ----------
181 //------------------------------------------------------------------------
183 //it is important to define STRICT and enforce including <windows.h> before
184 //Standard_Macro.hxx undefines it and includes <windows.h> causing compilation errors
191 #include <OSD_Path.hxx>
192 #include <OSD_SharedLibrary.hxx>
193 #include <TCollection_AsciiString.hxx>
195 static DWORD lastDLLError;
196 static Standard_Character errMsg[ 1024 ];
198 OSD_SharedLibrary :: OSD_SharedLibrary () {
203 } // end constructor ( 1 )
205 OSD_SharedLibrary :: OSD_SharedLibrary ( const Standard_CString aFilename ) {
210 SetName ( aFilename );
212 } // end constructro ( 2 )
214 void OSD_SharedLibrary :: SetName ( const Standard_CString aName ) {
216 OSD_Path path ( aName );
217 TCollection_AsciiString name ( aName );
219 if ( myName != NULL )
223 myName = new Standard_Character[ strlen ( aName ) + 1 ];
225 strcpy ( myName, aName );
228 name.AssignCat ( path.Extension () );
230 myHandle = GetModuleHandle ( name.ToCString () );
232 } // end OSD_SharedLibrary :: SetName
234 Standard_CString OSD_SharedLibrary :: Name () const {
238 } // end OSD_SharedLibrary :: Name
240 Standard_Boolean OSD_SharedLibrary :: DlOpen ( const OSD_LoadMode /*Mode*/ ) {
242 Standard_Boolean retVal = Standard_True;
244 if ( ( myHandle ) == NULL &&
245 ( myHandle = ( HINSTANCE )LoadLibraryEx (
246 myName, NULL, LOAD_WITH_ALTERED_SEARCH_PATH
250 lastDLLError = GetLastError ();
251 retVal = Standard_False;
257 } // end OSD_SharedLibrary :: DlOpen
259 OSD_Function OSD_SharedLibrary :: DlSymb ( const Standard_CString Name ) const {
261 OSD_Function func = ( OSD_Function )GetProcAddress ( ( HMODULE )myHandle, Name );
265 lastDLLError = GetLastError ();
269 } // end OSD_SharedLibrary :: DlSymb
271 void OSD_SharedLibrary :: DlClose () const {
273 FreeLibrary ( ( HMODULE )myHandle );
275 } // end OSD_SharedLibrary :: DlClose
277 Standard_CString OSD_SharedLibrary :: DlError () const {
280 FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ARGUMENT_ARRAY,
281 0, lastDLLError, MAKELANGID( LANG_NEUTRAL, SUBLANG_NEUTRAL ), errMsg, 1024, ( va_list* )&myName
286 } // end OSD_SharedLibrary :: DlError
288 void OSD_SharedLibrary :: Destroy () {
290 if ( myName != NULL ) delete [] myName;
292 } // end OSD_SharedLibrary :: Destroy