/perl-install/

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/* Copyright (c) 1998, 1999, 2001 John E. Davis
 * This file is part of the S-Lang library.
 *
 * You may distribute under the terms of either the GNU General Public
 * License or the Perl Artistic License.
 */

#include "slinclud.h"

#include "slang.h"
#include "_slang.h"

#define SLANG_HAS_DYNAMIC_LINKING 1

#ifndef HAVE_DLFCN_H
# undef SLANG_HAS_DYNAMIC_LINKING
# define SLANG_HAS_DYNAMIC_LINKING	0
#endif

/* The rest of this file is in the if block */
#if SLANG_HAS_DYNAMIC_LINKING

#ifdef HAVE_DLFCN_H
# include <dlfcn.h>
#endif

static char *Module_Path;
#define MODULE_PATH_ENV_NAME	"SLANG_MODULE_PATH"
#ifndef MODULE_INSTALL_DIR
# define MODULE_INSTALL_DIR "/usr/local/lib/slang/modules"
#endif

typedef struct _Handle_Type
{
   struct _Handle_Type *next;
   char *name;
   VOID_STAR handle;
   void (*deinit_fun) (void);
}
Handle_Type;

static Handle_Type *Handle_List;

static void delete_handles (void)
{
   while (Handle_List != NULL)
     {
	Handle_Type *next = Handle_List->next;

	if (Handle_List->deinit_fun != NULL)
	  Handle_List->deinit_fun ();
	(void) dlclose (Handle_List->handle);
	SLang_free_slstring (Handle_List->name);
	SLfree ((char *)Handle_List);
	Handle_List = next;
     }
}

static Handle_Type *save_handle (char *name, VOID_STAR h, void (*df)(void))
{
   Handle_Type *l;

   l = (Handle_Type *) SLmalloc (sizeof (Handle_Type));
   if (l == NULL)
     return NULL;
   memset ((char *) l, 0, sizeof(Handle_Type));
   if (NULL == (l->name = SLang_create_slstring (name)))
     {
	SLfree ((char *) l);
	return NULL;
     }
   l->handle = h;
   l->next = Handle_List;
   l->deinit_fun = df;
   Handle_List = l;

   return l;
}

static Handle_Type *find_handle (char *name)
{
   Handle_Type *l;

   l = Handle_List;
   while (l != NULL)
     {
	if (0 == strcmp (l->name, name))
	  break;
	l = l->next;
     }
   return l;
}

static int import_from_library (char *name, 
				char *init_fun_name, char *deinit_fun_name,
				char *file,
				char *ns,
				char *ns_init_fun_name)
{
   VOID_STAR handle;
   int (*init_fun) (void);
   int (*ns_init_fun) (char *);
   void (*deinit_fun) (void);
   char *err;
   char filebuf[1024];
   char *fun_name;

   if (NULL != find_handle (name))
     return 0;			       /* already loaded */

   while (1)
     {
#ifndef RTLD_GLOBAL
# define RTLD_GLOBAL 0
#endif