#include <DLL_Manager.h>
Public Member Functions | |
ACE_DLL_Handle (void) | |
Default construtor. | |
~ACE_DLL_Handle (void) | |
Destructor. | |
const ACE_TCHAR * | dll_name () const |
Returns the name of the shared library (without prefixes or suffixes). | |
int | open (const ACE_TCHAR *dll_name, int open_mode, ACE_SHLIB_HANDLE handle) |
int | close (int unload=0) |
sig_atomic_t | refcount (void) const |
Return the current refcount. | |
void * | symbol (const ACE_TCHAR *symbol_name, int ignore_errors=0) |
ACE_SHLIB_HANDLE | get_handle (int become_owner=0) |
Private Member Functions | |
auto_ptr< ACE_TString > | error (void) |
void | get_dll_names (const ACE_TCHAR *dll_name, ACE_Array< ACE_TString > &try_names) |
ACE_DLL_Handle (const ACE_DLL_Handle &) | |
void | operator= (const ACE_DLL_Handle &) |
Private Attributes | |
sig_atomic_t | refcount_ |
ACE_TCHAR * | dll_name_ |
Name of the shared library. | |
ACE_SHLIB_HANDLE | handle_ |
Handle to the actual library loaded by the OS. | |
Static Private Attributes | |
static sig_atomic_t | open_called_ = 0 |
This class is an wrapper over the various methods for utilizing a dynamically linked library (DLL), which is called a shared library on some platforms. It is refcounted and managed by ACE_DLL_Manager, so there will only be a single instance of this class for each dll loaded, no matter how many instances of ACE_DLL an application has open. Operations <open>, <close>, and <symbol> have been implemented to help opening/closing and extracting symbol information from a DLL, respectively.
Most of this class came from the original ACE_DLL class. ACE_DLL is now just an interface that passed all it's calls either directly or via ACE_DLL_Manager to this class for execution.
ACE_DLL_Handle::ACE_DLL_Handle | ( | void | ) |
Default construtor.
ACE_DLL_Handle::~ACE_DLL_Handle | ( | void | ) |
Destructor.
ACE_DLL_Handle::ACE_DLL_Handle | ( | const ACE_DLL_Handle & | ) | [private] |
int ACE_DLL_Handle::close | ( | int | unload = 0 |
) |
Call to close the DLL object. If unload = 0, it only decrements the refcount, but if unload = 1, then it will actually unload the library when the refcount == 0;
const ACE_TCHAR * ACE_DLL_Handle::dll_name | ( | void | ) | const |
Returns the name of the shared library (without prefixes or suffixes).
auto_ptr< ACE_TString > ACE_DLL_Handle::error | ( | void | ) | [private] |
Returns a pointer to a string explaining why <symbol> or <open> failed. This is used internal to print out the error to the log, but since this object is shared, we can't store or return the error to the caller.
void ACE_DLL_Handle::get_dll_names | ( | const ACE_TCHAR * | dll_name, | |
ACE_Array< ACE_TString > & | try_names | |||
) | [private] |
ACE_SHLIB_HANDLE ACE_DLL_Handle::get_handle | ( | int | become_owner = 0 |
) |
Return the handle to the caller. If become_owner is non-0 then caller assumes ownership of the handle so we decrement the retcount.
int ACE_DLL_Handle::open | ( | const ACE_TCHAR * | dll_name, | |
int | open_mode, | |||
ACE_SHLIB_HANDLE | handle | |||
) |
This method opens and dynamically links dll_name. The default mode is <RTLD_LAZY>, which loads identifier symbols but not the symbols for functions, which are loaded dynamically on-demand. Other supported modes include: <RTLD_NOW>, which performs all necessary relocations when dll_name is first loaded and <RTLD_GLOBAL>, which makes symbols available for relocation processing of any other DLLs. Returns -1 on failure and 0 on success.
void ACE_DLL_Handle::operator= | ( | const ACE_DLL_Handle & | ) | [private] |
sig_atomic_t ACE_DLL_Handle::refcount | ( | void | ) | const |
Return the current refcount.
void * ACE_DLL_Handle::symbol | ( | const ACE_TCHAR * | symbol_name, | |
int | ignore_errors = 0 | |||
) |
If symbol_name is in the symbol table of the DLL a pointer to the symbol_name is returned. Otherwise, returns 0. Set the ignore_errors flag to supress logging errors if symbol_name isn't found. This is nice if you just want to probe a dll to see what's available, since missing functions in that case aren't really errors.
ACE_TCHAR* ACE_DLL_Handle::dll_name_ [private] |
Name of the shared library.
ACE_SHLIB_HANDLE ACE_DLL_Handle::handle_ [private] |
Handle to the actual library loaded by the OS.
sig_atomic_t ACE_DLL_Handle::open_called_ = 0 [static, private] |
sig_atomic_t ACE_DLL_Handle::refcount_ [private] |