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/*
* ion/ioncore/modules.c
*
* Copyright (c) Tuomo Valkonen 1999-2004.
*
* Ion 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 2.1 of the License, or
* (at your option) any later version.
*/
#include <ltdl.h>
#include <string.h>
#include <ctype.h>
#include "common.h"
#include "modules.h"
#include "readconfig.h"
#include "../version.h"
static lt_dlcaller_id ltid=0;
/*{{{ Loading and initialization code */
static void *get_module_symbol(lt_dlhandle handle, char *name)
{
const lt_dlinfo *info;
char *p;
void *ret;
info=lt_dlgetinfo(handle);
if(info==NULL || info->name==NULL){
warn("lt_dlgetinfo() failed to return module name.");
return NULL;
}
p=scat(info->name, name);
if(p==NULL){
warn_err();
return NULL;
}
ret=lt_dlsym(handle, p);
free(p);
return ret;
}
static bool check_version(lt_dlhandle handle)
{
char *versionstr=(char*)get_module_symbol(handle, "_module_ion_api_version");
if(versionstr==NULL)
return FALSE;
return (strcmp(versionstr, ION_API_VERSION)==0);
}
static bool call_init(lt_dlhandle handle)
{
bool (*initfn)(void);
initfn=(bool (*)())get_module_symbol(handle, "_module_init");
if(initfn==NULL)
return TRUE;
return initfn();
}
bool init_module_support()
{
#ifdef CF_PRELOAD_MODULES
LTDL_SET_PRELOADED_SYMBOLS();
#endif
if(lt_dlinit()!=0){
warn("lt_dlinit: %s", lt_dlerror());
return FALSE;
}
ltid=lt_dlcaller_register();
return TRUE;
}
/*EXTL_DOC
* Attempt to load module \var{modname}. Ion will use libltdl to search
* the library path (the default setting is \file{\~{}/.ion2/libs} and
* \file{\$PREFIX/lib/ion}) and also try diffent extensions, so only
* the module name should usually be necessary to give here.
*/
EXTL_EXPORT
bool load_module(const char *modname)
{
lt_dlhandle handle=NULL;
if(modname==NULL)
return FALSE;
handle=lt_dlopenext(modname);
if(handle==NULL){
warn("Failed to load module %s: %s", modname, lt_dlerror());
return FALSE;
}
if(lt_dlcaller_set_data(ltid, handle, <id)!=NULL){
warn("Module %s already loaded", modname);
return TRUE;
}
if(!check_version(handle)){
warn_obj(modname, "Module version information not found or version "
"mismatch. Refusing to use.");
goto err;
}
if(!call_init(handle))
goto err;
return TRUE;
err:
lt_dlclose(handle);
return FALSE;
}
/*}}}*/
/*{{{ Deinit */
static void call_deinit(lt_dlhandle handle, char *name)
{
void (*deinitfn)(void);
deinitfn=(void (*)())get_module_symbol(handle, "_module_deinit");
if(deinitfn!=NULL)
deinitfn();
}
static int do_unload_module(lt_dlhandle handle, void *unused)
{
const lt_dlinfo *info;
info=lt_dlgetinfo(handle);
if(info==NULL || info->name==NULL){
warn("Unable to get module name.");
}else{
call_deinit(handle, info->name);
}
lt_dlclose(handle);
return 0;
}
void unload_modules()
{
lt_dlforeach(do_unload_module, NULL);
}
/*}}}*/
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