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/* GIO - GLib Input, Output and Streaming Library
*
* Copyright (C) 2006-2007 Red Hat, Inc.
*
* This library 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.
*
* This library 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 this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*
* Author: Alexander Larsson <alexl@redhat.com>
*/
#include <config.h>
#include "giomodule.h"
/**
* SECTION:giomodule
* @short_description: Loadable GIO Modules
*
* Provides an interface and default functions for loading and unloading
* GIO modules.
*
**/
struct _GIOModule {
GTypeModule parent_instance;
gchar *filename;
GModule *library;
void (* load) (GIOModule *module);
void (* unload) (GIOModule *module);
};
struct _GIOModuleClass
{
GTypeModuleClass parent_class;
};
static void g_io_module_finalize (GObject *object);
static gboolean g_io_module_load_module (GTypeModule *gmodule);
static void g_io_module_unload_module (GTypeModule *gmodule);
G_DEFINE_TYPE (GIOModule, g_io_module, G_TYPE_TYPE_MODULE);
static void
g_io_module_class_init (GIOModuleClass *class)
{
GObjectClass *object_class = G_OBJECT_CLASS (class);
GTypeModuleClass *type_module_class = G_TYPE_MODULE_CLASS (class);
object_class->finalize = g_io_module_finalize;
type_module_class->load = g_io_module_load_module;
type_module_class->unload = g_io_module_unload_module;
}
static void
g_io_module_init (GIOModule *module)
{
}
static void
g_io_module_finalize (GObject *object)
{
GIOModule *module = G_IO_MODULE (object);
g_free (module->filename);
G_OBJECT_CLASS (g_io_module_parent_class)->finalize (object);
}
static gboolean
g_io_module_load_module (GTypeModule *gmodule)
{
GIOModule *module = G_IO_MODULE (gmodule);
if (!module->filename)
{
g_warning ("GIOModule path not set");
return FALSE;
}
module->library = g_module_open (module->filename, G_MODULE_BIND_LAZY | G_MODULE_BIND_LOCAL);
if (!module->library)
{
g_printerr ("%s\n", g_module_error ());
return FALSE;
}
/* Make sure that the loaded library contains the required methods */
if (! g_module_symbol (module->library,
"g_io_module_load",
(gpointer *) &module->load) ||
! g_module_symbol (module->library,
"g_io_module_unload",
(gpointer *) &module->unload))
{
g_printerr ("%s\n", g_module_error ());
g_module_close (module->library);
return FALSE;
}
/* Initialize the loaded module */
module->load (module);
return TRUE;
}
static void
g_io_module_unload_module (GTypeModule *gmodule)
{
GIOModule *module = G_IO_MODULE (gmodule);
module->unload (module);
g_module_close (module->library);
module->library = NULL;
module->load = NULL;
module->unload = NULL;
}
/**
* g_io_module_new:
* @filename: filename of the module to load.
*
* Loads a new module into GIO.
*
* Returns: a #GIOModule from given @filename,
* or %NULL on error.
**/
GIOModule *
g_io_module_new (const gchar *filename)
{
GIOModule *module;
g_return_val_if_fail (filename != NULL, NULL);
module = g_object_new (G_IO_TYPE_MODULE, NULL);
module->filename = g_strdup (filename);
return module;
}
static gboolean
is_valid_module_name (const gchar *basename)
{
#if !defined(G_OS_WIN32) && !defined(G_WITH_CYGWIN)
return
g_str_has_prefix (basename, "lib") &&
g_str_has_suffix (basename, ".so");
#else
return g_str_has_suffix (basename, ".dll");
#endif
}
static GList *
load_modules (const char *dirname)
{
const gchar *name;
GDir *dir;
GList *modules;
if (!g_module_supported ())
return NULL;
dir = g_dir_open (dirname, 0, NULL);
if (!dir)
return NULL;
modules = NULL;
while ((name = g_dir_read_name (dir)))
{
if (is_valid_module_name (name))
{
GIOModule *module;
gchar *path;
path = g_build_filename (dirname, name, NULL);
module = g_io_module_new (path);
if (!g_type_module_use (G_TYPE_MODULE (module)))
{
g_printerr ("Failed to load module: %s\n", path);
g_object_unref (module);
g_free (path);
continue;
}
g_free (path);
g_type_module_unuse (G_TYPE_MODULE (module));
modules = g_list_prepend (modules, module);
}
}
g_dir_close (dir);
return modules;
}
G_LOCK_DEFINE_STATIC (loaded_dirs);
static GHashTable *loaded_dirs = NULL;
/**
* g_io_modules_ensure_loaded:
* @directory: string containing a directory path.
*
* Loads all of the modules within the @directory.
**/
void
g_io_modules_ensure_loaded (const char *directory)
{
GList *modules;
g_return_if_fail (directory != NULL);
G_LOCK (loaded_dirs);
if (loaded_dirs == NULL)
loaded_dirs = g_hash_table_new (g_str_hash, g_str_equal);
if (!g_hash_table_lookup_extended (loaded_dirs, directory,
NULL, NULL))
{
modules = load_modules (directory);
g_hash_table_insert (loaded_dirs,
g_strdup (directory),
modules);
}
G_UNLOCK (loaded_dirs);
}
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