dynload.c

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/*
    This file is part of darktable,
    Copyright (C) 2011 Henrik Andersson.
    Copyright (C) 2011 johannes hanika.
    Copyright (C) 2011 Ulrich Pegelow.
    Copyright (C) 2012 Richard Wonka.
    Copyright (C) 2013-2014, 2016 Tobias Ellinghaus.
    Copyright (C) 2020 parafin.
    Copyright (C) 2020 Pascal Obry.
    Copyright (C) 2022 Martin Bařinka.
    
    darktable is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
    
    darktable 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 General Public License for more details.
    
    You should have received a copy of the GNU General Public License
    along with darktable.  If not, see <http://www.gnu.org/licenses/>.
*/
 
#ifdef HAVE_OPENCL
 
#include "system/macros.h"
#include "system/mem_alloc.h"
#include <stdlib.h>
#ifndef __APPLE__
#include <stdio.h>
#include <string.h>
#else 
#include <dlfcn.h>
#include <glib.h>
#endif 
 
#include "system/dynload.h"
 
 
#ifndef __APPLE__
/* check if gmodules is supported on this platform */
int dt_gmodule_supported(void)
{
  int success = g_module_supported();
 
  return success;
}
 
 
/* dynamically load library */
dt_gmodule_t *dt_gmodule_open(const char *library)
{
  dt_gmodule_t *module = NULL;
  GModule *gmodule;
  char *name;
 
  if(strchr(library, '/') == NULL)
  {
    name = g_module_build_path(NULL, library);
  }
  else
  {
    name = g_strdup(library);
  }
 
  gmodule = g_module_open(name, G_MODULE_BIND_LAZY | G_MODULE_BIND_LOCAL);
 
  if(!IS_NULL_PTR(gmodule))
  {
    module = (dt_gmodule_t *)malloc(sizeof(dt_gmodule_t));
    module->gmodule = gmodule;
    module->library = name;
  }
  else
    dt_free(name);
 
  return module;
}
 
 
/* get pointer to symbol */
int dt_gmodule_symbol(dt_gmodule_t *module, const char *name, void (**pointer)(void))
{
  int success = g_module_symbol(module->gmodule, name, (gpointer)pointer);
 
  return success;
}
#else 
/* check if gmodules is supported on this platform */
int dt_gmodule_supported(void)
{
  return TRUE;
}
 
/* dynamically load library */
dt_gmodule_t *dt_gmodule_open(const char *library)
{
  // logic here is simplified since it's used only specifically for OpenCL
  dt_gmodule_t *module = NULL;
  void *gmodule = dlopen(library, RTLD_LAZY | RTLD_LOCAL);
 
  if(!IS_NULL_PTR(gmodule))
  {
    module = (dt_gmodule_t *)malloc(sizeof(dt_gmodule_t));
    module->gmodule = gmodule;
    module->library = g_strdup(library);
  }
 
  return module;
}
 
/* get pointer to symbol */
int dt_gmodule_symbol(dt_gmodule_t *module, const char *name, void (**pointer)(void))
{
  *pointer = dlsym(module->gmodule, name);
 
  return !IS_NULL_PTR(*pointer) ? TRUE : FALSE;
}
#endif 
#endif //HAVE_OPENCL
 
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