/* loader-shl_load.c --  dynamic linking with shl_load (HP-UX)
 

    Copyright (C) 1998-2000, 2004, 2006-2008, 2011-2015 Free Software
    Foundation, Inc.

    Written by Thomas Tanner, 1998
 
    NOTE: The canonical source of this file is maintained with the
    GNU Libtool package.  Report bugs to bug-libtool@gnu.org.
 
 GNU Libltdl is free software; you can redistribute it and/or
 modify it under the terms of the GNU Lesser General Public
 License as published by the Free Software Foundation; either
 version 2 of the License, or (at your option) any later version.
 
 As a special exception to the GNU Lesser General Public License,
 if you distribute this file as part of a program or library that
 is built using GNU Libtool, you may include this file under the
 same distribution terms that you use for the rest of that program.
 
 GNU Libltdl is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU Lesser General Public License for more details.
 
 You should have received a copy of the GNU Lesser General Public
 License along with GNU Libltdl; see the file COPYING.LIB.  If not, a
 copy can be downloaded from  http://www.gnu.org/licenses/lgpl.html,
 or obtained by writing to the Free Software Foundation, Inc.,
 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */
 
 #include "lt__private.h"
 #include "lt_dlloader.h"
 
 /* Use the preprocessor to rename non-static symbols to avoid namespace
    collisions when the loader code is statically linked into libltdl.
    Use the "<module_name>_LTX_" prefix so that the symbol addresses can
    be fetched from the preloaded symbol list by lt_dlsym():  */
 #define get_vtable	shl_load_LTX_get_vtable
 
 LT_BEGIN_C_DECLS
 LT_SCOPE lt_dlvtable *get_vtable (lt_user_data loader_data);
 LT_END_C_DECLS
 
 
 /* Boilerplate code to set up the vtable for hooking this loader into
    libltdl's loader list:  */
 static int	 vl_exit  (lt_user_data loader_data);
 static lt_module vm_open  (lt_user_data loader_data, const char *filename,
                            lt_dladvise advise);
 static int	 vm_close (lt_user_data loader_data, lt_module module);
 static void *	 vm_sym   (lt_user_data loader_data, lt_module module,
 			  const char *symbolname);
 
 static lt_dlvtable *vtable = 0;
 
 /* Return the vtable for this loader, only the name and sym_prefix
    attributes (plus the virtual function implementations, obviously)
    change between loaders.  */
 lt_dlvtable *
 get_vtable (lt_user_data loader_data)
 {
   if (!vtable)
     {
       vtable = lt__zalloc (sizeof *vtable);
     }
 
   if (vtable && !vtable->name)
     {
       vtable->name		= "lt_shl_load";
       vtable->module_open	= vm_open;
       vtable->module_close	= vm_close;
       vtable->find_sym		= vm_sym;
       vtable->dlloader_exit	= vl_exit;
       vtable->dlloader_data	= loader_data;
       vtable->priority		= LT_DLLOADER_APPEND;
     }
 
   if (vtable && (vtable->dlloader_data != loader_data))
     {
       LT__SETERROR (INIT_LOADER);
       return 0;
     }
 
   return vtable;
 }
 
 
 
 /* --- IMPLEMENTATION --- */
 
 

 #if defined HAVE_DL_H

 #  include <dl.h>
 #endif
 
 /* some flags are missing on some systems, so we provide
  * harmless defaults.
  *
  * Mandatory:
  * BIND_IMMEDIATE  - Resolve symbol references when the library is loaded.
  * BIND_DEFERRED   - Delay code symbol resolution until actual reference.
  *
  * Optionally:
  * BIND_FIRST	   - Place the library at the head of the symbol search

  *		     order.

  * BIND_NONFATAL   - The default BIND_IMMEDIATE behavior is to treat all

  *		     unsatisfied symbols as fatal.  This flag allows
  *		     binding of unsatisfied code symbols to be deferred
  *		     until use.

  *		     [Perl: For certain libraries, like DCE, deferred
  *		     binding often causes run time problems. Adding
  *		     BIND_NONFATAL to BIND_IMMEDIATE still allows
  *		     unresolved references in situations like this.]
  * BIND_NOSTART	   - Do not call the initializer for the shared library
  *		     when the library is loaded, nor on a future call to
  *		     shl_unload().
  * BIND_VERBOSE	   - Print verbose messages concerning possible
  *		     unsatisfied symbols.
  *
  * hp9000s700/hp9000s800:
  * BIND_RESTRICTED - Restrict symbols visible by the library to those
  *		     present at library load time.
  * DYNAMIC_PATH	   - Allow the loader to dynamically search for the
  *		     library specified by the path argument.
  */
 

 #if !defined DYNAMIC_PATH

 #  define DYNAMIC_PATH		0
 #endif

 #if !defined BIND_RESTRICTED

 #  define BIND_RESTRICTED	0
 #endif
 
 #define	LT_BIND_FLAGS	(BIND_IMMEDIATE | BIND_NONFATAL | DYNAMIC_PATH)
 
 
 /* A function called through the vtable when this loader is no
    longer needed by the application.  */
 static int

 vl_exit (lt_user_data loader_data LT__UNUSED)

 {
   vtable = NULL;
   return 0;
 }
 
 /* A function called through the vtable to open a module with this
    loader.  Returns an opaque representation of the newly opened
    module for processing with this loader's other vtable functions.  */
 static lt_module

 vm_open (lt_user_data loader_data LT__UNUSED, const char *filename,
          lt_dladvise advise LT__UNUSED)

 {
   static shl_t self = (shl_t) 0;
   lt_module module = shl_load (filename, LT_BIND_FLAGS, 0L);
 
   /* Since searching for a symbol against a NULL module handle will also
      look in everything else that was already loaded and exported with
      the -E compiler flag, we always cache a handle saved before any
      modules are loaded.  */
   if (!self)
     {
       void *address;
       shl_findsym (&self, "main", TYPE_UNDEFINED, &address);
     }
 
   if (!filename)
     {
       module = self;
     }
   else
     {
       module = shl_load (filename, LT_BIND_FLAGS, 0L);
 
       if (!module)
 	{
 	  LT__SETERROR (CANNOT_OPEN);
 	}
     }
 
   return module;
 }
 
 /* A function called through the vtable when a particular module
    should be unloaded.  */
 static int

 vm_close (lt_user_data loader_data LT__UNUSED, lt_module module)

 {
   int errors = 0;
 
   if (module && (shl_unload ((shl_t) (module)) != 0))
     {
       LT__SETERROR (CANNOT_CLOSE);
       ++errors;
     }
 
   return errors;
 }
 
 
 /* A function called through the vtable to get the address of
    a symbol loaded from a particular module.  */
 static void *

 vm_sym (lt_user_data loader_data LT__UNUSED, lt_module module, const char *name)

 {
   void *address = 0;
 
   /* sys_shl_open should never return a NULL module handle */
   if (module == (lt_module) 0)
   {
     LT__SETERROR (INVALID_HANDLE);
   }
   else if (!shl_findsym((shl_t*) &module, name, TYPE_UNDEFINED, &address))
     {
       if (!address)
 	{
 	  LT__SETERROR (SYMBOL_NOT_FOUND);
 	}
     }
 
   return address;
 }