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// DLL.cpp
// $Id$
#include "ace/DLL.h"
#include "ace/Log_Msg.h"
#include "ace/ACE.h"
#include "ace/DLL_Manager.h"
ACE_RCSID(ace, DLL, "$Id$")
// Uncomment these lines to turn tracing on for this file.
//#undef ACE_TRACE
//#define ACE_TRACE(X) ACE_TRACE_IMPL(X)
// Default constructor. Also, by default, the object will be closed
// before it is destroyed.
ACE_DLL::ACE_DLL (int close_on_destruction)
: open_mode_ (0),
dll_name_ (0),
close_on_destruction_ (close_on_destruction),
dll_handle_ (0),
error_ (0)
{
ACE_TRACE ("ACE_DLL::ACE_DLL (int)");
}
ACE_DLL::ACE_DLL (const ACE_DLL &rhs)
{
ACE_TRACE ("ACE_DLL::ACE_DLL (const ACE_DLL &)");
// Have to do this since open() calls close()...
this->dll_handle_ = 0;
this->dll_name_ = 0;
this->close_on_destruction_ = 1;
this->error_ = 0;
// This will automatically up the refcount.
if (this->open (rhs.dll_name_, rhs.open_mode_, this->close_on_destruction_) != 0)
ACE_ERROR ((LM_ERROR,
ACE_LIB_TEXT ("%s\n"),
this->error ()));
}
// If the library name and the opening mode are specified than on
// object creation the library is implicitly opened.
ACE_DLL::ACE_DLL (const ACE_TCHAR *dll_name,
int open_mode,
int close_on_destruction)
: open_mode_ (open_mode),
dll_name_ (0),
close_on_destruction_ (close_on_destruction),
dll_handle_ (0),
error_ (0)
{
ACE_TRACE ("ACE_DLL::ACE_DLL");
if (this->open (dll_name, this->open_mode_, close_on_destruction) != 0)
ACE_ERROR ((LM_ERROR,
ACE_LIB_TEXT ("%s\n"),
this->error ()));
}
// The library is closed before the class gets destroyed depending on
// the close_on_destruction value specified which is stored in
// close_on_destruction_.
ACE_DLL::~ACE_DLL (void)
{
ACE_TRACE ("ACE_DLL::~ACE_DLL");
this->close ();
}
// This method opens the library based on the mode specified using the
// ACE_SHLIB_HANDLE which is obtained on making the ACE_OS::dlopen call.
// The default mode is:
// RTLD_LAZY Only references to data symbols are relocate when the
// object is first loaded.
// The other modes include:
// RTLD_NOW All necessary relocations are performed when the
// object is first loaded.
// RTLD_GLOBAL The object symbols are made available for the
// relocation processing of any other object.
int
ACE_DLL::open (const ACE_TCHAR *dll_filename,
int open_mode,
int close_on_destruction)
{
ACE_TRACE ("ACE_DLL::open");
return open_i (dll_filename, open_mode, close_on_destruction);
}
int
ACE_DLL::open_i (const ACE_TCHAR *dll_filename,
int open_mode,
int close_on_destruction,
ACE_SHLIB_HANDLE handle)
{
ACE_TRACE ("ACE_DLL::open");
this->error_ = 0;
if (!dll_filename)
return -1;
if (this->dll_handle_)
{
// If we have a good handle and its the same name, just return.
if (ACE_OS_String::strcmp (this->dll_name_, dll_filename) == 0)
return 0;
else
this->close ();
}
if (!this->dll_name_)
{
this->dll_name_ = ACE::strnew (dll_filename);
}
this->open_mode_ = open_mode;
this->close_on_destruction_ = close_on_destruction;
this->dll_handle_ = ACE_DLL_Manager::instance()->open_dll (this->dll_name_,
this->open_mode_,
handle);
if (!this->dll_handle_)
this->error_ = 1;
return this->error_ ? -1 : 0;
}
// The symbol refernce of the name specified is obtained.
void *
ACE_DLL::symbol (const ACE_TCHAR *sym_name)
{
ACE_TRACE ("ACE_DLL::symbol");
this->error_ = 0;
void *sym = this->dll_handle_->symbol (sym_name);
if (!sym)
this->error_ = 1;
return sym;
}
// The library is closed using the ACE_SHLIB_HANDLE obejct. i.e. The
// shared object is now disassociated form the current process.
int
ACE_DLL::close (void)
{
ACE_TRACE ("ACE_DLL::close");
int retval = 0;
if (this->close_on_destruction_ && this->dll_name_ &&
(retval = ACE_DLL_Manager::instance ()->close_dll (this->dll_name_)) != 0)
this->error_ = 1;
// Even if close_dll() failed, go ahead and cleanup.
this->dll_handle_ = 0;
delete this->dll_name_;
this->dll_name_ = 0;
this->close_on_destruction_ = 0;
return retval;
}
// This method is used return the last error of a library operation.
ACE_TCHAR *
ACE_DLL::error (void) const
{
ACE_TRACE ("ACE_DLL::error");
if (this->error_)
return ACE_LIB_TEXT ("Error: check log for details.");
return 0;
}
// Return the handle to the user either temporarily or forever, thus
// orphaning it. If 0 means the user wants the handle forever and if 1
// means the user temporarily wants to take the handle.
ACE_SHLIB_HANDLE
ACE_DLL::get_handle (int become_owner) const
{
ACE_TRACE ("ACE_DLL::get_handle");
ACE_SHLIB_HANDLE handle = ACE_SHLIB_INVALID_HANDLE;
if (this->dll_handle_)
handle = this->dll_handle_->get_handle (become_owner);
return handle;
}
// Set the handle for the DLL. By default, the object will be closed
// before it is destroyed.
int
ACE_DLL::set_handle (ACE_SHLIB_HANDLE handle,
int close_on_destruction)
{
ACE_TRACE ("ACE_DLL::set_handle");
// Create a unique name for the dll (if some knows how to get the
// real name of the dll, please replace this code).
auto_ptr <ACE_TCHAR> tempname (ACE::strnew (ACE_LIB_TEXT ("tmp_XXXXXX")));
ACE_HANDLE fd;
if ((fd = ACE_OS::mkstemp (tempname.get ())) = 0)
ACE_ERROR_RETURN ((LM_ERROR,
ACE_LIB_TEXT ("ACE_DLL::set_handle: error calling "
"ACE_OS::mkstemp %s\n"),
tempname.get ()),
-1);
ACE_OS::close (fd);
return this->open_i (tempname.get (), 1, close_on_destruction, handle);
}
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