--- /dev/null
+ GNU LIBRARY GENERAL PUBLIC LICENSE
+ Version 2, June 1991
+
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+
+That's all there is to it!
--- /dev/null
+/* GLIB - Library of useful routines for C programming
+ * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library 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.
+ */
+#include "gmodule.h"
+#include "gmoduleconf.h"
+#include <errno.h>
+#include <string.h>
+
+
+/* We maintain a list of modules, so we can reference count them.
+ * That's needed because some platforms don't support refernce counts on
+ * modules (http://www.stat.umn.edu/~luke/xls/projects/dlbasics/dlbasics.html).
+ * Also, the module for the program itself is kept seperatedly for
+ * faster access.
+ */
+
+
+/* --- structures --- */
+struct _GModule
+{
+ gchar *file_name;
+ gpointer handle;
+ guint ref_count;
+ GModule *next;
+};
+
+
+/* --- prototypes --- */
+static gpointer _g_module_open (const gchar *file_name,
+ gboolean bind_lazy);
+static void _g_module_close (gpointer *handle_p,
+ gboolean is_unref);
+static gpointer _g_module_self (void);
+static gpointer _g_module_symbol (gpointer *handle_p,
+ const gchar *symbol_name);
+static inline void g_module_set_error (const gchar *error);
+static inline GModule* g_module_find_by_handle (gpointer handle);
+static inline GModule* g_module_find_by_name (const gchar *name);
+
+
+/* --- variables --- */
+static GModule *modules = NULL;
+static GModule *main_module = NULL;
+static gchar *module_error = NULL;
+
+
+/* --- inline functions --- */
+static inline GModule*
+g_module_find_by_handle (gpointer handle)
+{
+ GModule *module;
+
+ for (module = modules; module; module = module->next)
+ if (handle == module->handle)
+ return module;
+ return NULL;
+}
+
+static inline GModule*
+g_module_find_by_name (const gchar *name)
+{
+ GModule *module;
+
+ for (module = modules; module; module = module->next)
+ if (strcmp (name, module->file_name) == 0)
+ return module;
+ return NULL;
+}
+
+static inline void
+g_module_set_error (const gchar *error)
+{
+ if (module_error)
+ g_free (module_error);
+ if (error)
+ module_error = g_strdup (error);
+ else
+ module_error = NULL;
+ errno = 0;
+}
+
+
+/* --- include platform specifc code --- */
+#define CHECK_ERROR(rv) { g_module_set_error (NULL); }
+#if (G_MODULE_IMPL == G_MODULE_IMPL_DL)
+#include "gmodule-dl.c"
+#elif (G_MODULE_IMPL == G_MODULE_IMPL_DLD)
+#include "gmodule-dld.c"
+#else
+#undef CHECK_ERROR
+#define CHECK_ERROR(rv) { g_module_set_error ("unsupported"); return rv; }
+#endif /* no implementation */
+
+
+/* --- functions --- */
+gboolean
+g_module_supported (void)
+{
+ CHECK_ERROR (FALSE);
+
+ return TRUE;
+}
+
+GModule*
+g_module_open (const gchar *file_name,
+ GModuleFlags flags)
+{
+ GModule *module;
+ gpointer handle;
+
+ CHECK_ERROR (NULL);
+
+ if (!file_name)
+ {
+ if (!main_module)
+ {
+ handle = _g_module_self ();
+ if (handle)
+ {
+ main_module = g_new (GModule, 1);
+ main_module->file_name = NULL;
+ main_module->ref_count = 1;
+ main_module->next = NULL;
+ main_module->handle = handle;
+ }
+ }
+
+ return main_module;
+ }
+
+ /* we first search the module list by name */
+ module = g_module_find_by_name (file_name);
+ if (module)
+ {
+ module->ref_count++;
+
+ return module;
+ }
+
+ /* open the module */
+ handle = _g_module_open (file_name, (flags & G_MODULE_BIND_LAZY) != 0);
+ if (handle)
+ {
+ GModule *module;
+
+ /* search the module list by handle, since file names are not unique */
+ module = g_module_find_by_handle (handle);
+ if (module)
+ {
+ _g_module_close (&module->handle, TRUE);
+ module->ref_count++;
+ g_module_set_error (NULL);
+
+ return module;
+ }
+
+ module = g_new (GModule, 1);
+ module->file_name = g_strdup (file_name);
+ module->handle = handle;
+ module->ref_count = 1;
+ module->next = modules;
+ modules = module;
+
+ return module;
+ }
+
+ return NULL;
+}
+
+gboolean
+g_module_close (GModule *module)
+{
+ CHECK_ERROR (FALSE);
+
+ g_return_val_if_fail (module != NULL, FALSE);
+ g_return_val_if_fail (module->ref_count > 0, FALSE);
+
+ if (module != main_module)
+ module->ref_count--;
+
+ if (!module->ref_count)
+ {
+ GModule *last;
+ GModule *node;
+
+ _g_module_close (&module->handle, FALSE);
+ g_free (module->file_name);
+
+ last = NULL;
+ node = modules;
+ while (node)
+ {
+ if (node == module)
+ {
+ if (last)
+ last->next = node->next;
+ else
+ modules = node->next;
+ break;
+ }
+ last = node;
+ node = last->next;
+ }
+ g_free (module);
+ }
+
+ return module_error == NULL;
+}
+
+gchar*
+g_module_error (void)
+{
+ return module_error;
+}
+
+gboolean
+g_module_symbol (GModule *module,
+ const gchar *symbol_name,
+ gconstpointer *symbol)
+{
+ if (symbol)
+ *symbol = NULL;
+ CHECK_ERROR (FALSE);
+
+ g_return_val_if_fail (module != NULL, FALSE);
+ g_return_val_if_fail (symbol_name != NULL, FALSE);
+ g_return_val_if_fail (symbol != NULL, FALSE);
+
+#ifdef G_MODULE_NEED_USCORE
+ symbol_name = g_strconcat ("_", symbol_name, NULL);
+ *symbol = _g_module_symbol (&module->handle, symbol_name);
+ g_free (symbol_name);
+#else /* !G_MODULE_NEED_USCORE */
+ *symbol = _g_module_symbol (&module->handle, symbol_name);
+#endif /* !G_MODULE_NEED_USCORE */
+
+ if (module_error)
+ {
+ *symbol = NULL;
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+gchar*
+g_module_name (GModule *module)
+{
+ g_return_val_if_fail (module != NULL, NULL);
+
+ if (module == main_module)
+ return "main";
+
+ return module->file_name;
+}
--- /dev/null
+/* testgmodule.c - test program for GMODULE
+ * Copyright (C) 1998 Tim Janik
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library 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.
+ */
+#include <gmodule.h>
+
+
+void
+g_clash_func (void)
+{
+ g_print ("GModule: Hello global clash\n");
+}
+
+typedef void (*SimpleFunc) (void);
+typedef void (*GModuleFunc) (GModule *);
+
+SimpleFunc gplugin_clash_func;
+
+
+int
+main (int arg,
+ char *argv[])
+{
+ GModule *module_self, *module_a, *module_b;
+ gchar *string;
+ gchar *plugin_a, *plugin_b;
+ SimpleFunc f_a, f_b, f_self;
+ GModuleFunc gmod_f;
+
+ string = g_get_current_dir ();
+ g_print ("testgmodule (%s):\n", string);
+
+ plugin_a = g_strconcat (string, "/.libs/", "libgplugin_a.so", NULL);
+ plugin_b = g_strconcat (string, "/.libs/", "libgplugin_b.so", NULL);
+ g_free (string);
+
+ /* module handles
+ */
+ g_print ("get main module handle\n");
+ module_self = g_module_open (NULL, G_MODULE_BIND_LAZY);
+ if (!module_self)
+ {
+ g_print ("error: %s\n", g_module_error ());
+ return 1;
+ }
+ g_print ("load plugin from \"%s\"\n", plugin_a);
+ module_a = g_module_open (plugin_a, G_MODULE_BIND_LAZY);
+ if (!module_a)
+ {
+ g_print ("error: %s\n", g_module_error ());
+ return 1;
+ }
+ g_print ("load plugin from \"%s\"\n", plugin_b);
+ module_b = g_module_open (plugin_b, G_MODULE_BIND_LAZY);
+ if (!module_b)
+ {
+ g_print ("error: %s\n", g_module_error ());
+ return 1;
+ }
+
+ /* get plugin specific symbols and call them
+ */
+ string = "gplugin_a_func";
+ g_print ("retrive symbol `%s' from \"%s\"\n", string, g_basename (g_module_name (module_a)));
+ if (!g_module_symbol (module_a, string, &f_a))
+ {
+ g_print ("error: %s\n", g_module_error ());
+ return 1;
+ }
+ string = "gplugin_b_func";
+ g_print ("retrive symbol `%s' from \"%s\"\n", string, g_basename (g_module_name (module_b)));
+ if (!g_module_symbol (module_b, string, &f_b))
+ {
+ g_print ("error: %s\n", g_module_error ());
+ return 1;
+ }
+ g_print ("call plugin function(%p) A: ", f_a);
+ f_a ();
+ g_print ("call plugin function(%p) B: ", f_b);
+ f_b ();
+
+ /* get and call globally clashing functions
+ */
+ string = "g_clash_func";
+ g_print ("retrive symbol `%s' from \"%s\"\n", string, g_basename (g_module_name (module_self)));
+ if (!g_module_symbol (module_self, string, &f_self))
+ {
+ g_print ("error: %s\n", g_module_error ());
+ return 1;
+ }
+ g_print ("retrive symbol `%s' from \"%s\"\n", string, g_basename (g_module_name (module_a)));
+ if (!g_module_symbol (module_a, string, &f_a))
+ {
+ g_print ("error: %s\n", g_module_error ());
+ return 1;
+ }
+ g_print ("retrive symbol `%s' from \"%s\"\n", string, g_basename (g_module_name (module_b)));
+ if (!g_module_symbol (module_b, string, &f_b))
+ {
+ g_print ("error: %s\n", g_module_error ());
+ return 1;
+ }
+ g_print ("call plugin function(%p) self: ", f_self);
+ f_self ();
+ g_print ("call plugin function(%p) A: ", f_a);
+ f_a ();
+ g_print ("call plugin function(%p) B: ", f_b);
+ f_b ();
+
+ /* get and call clashing plugin functions
+ */
+ string = "gplugin_clash_func";
+ g_print ("retrive symbol `%s' from \"%s\"\n", string, g_basename (g_module_name (module_a)));
+ if (!g_module_symbol (module_a, string, &f_a))
+ {
+ g_print ("error: %s\n", g_module_error ());
+ return 1;
+ }
+ g_print ("retrive symbol `%s' from \"%s\"\n", string, g_basename (g_module_name (module_b)));
+ if (!g_module_symbol (module_b, string, &f_b))
+ {
+ g_print ("error: %s\n", g_module_error ());
+ return 1;
+ }
+ g_print ("call plugin function(%p) A: ", f_a);
+ gplugin_clash_func = f_a;
+ gplugin_clash_func ();
+ g_print ("call plugin function(%p) B: ", f_b);
+ gplugin_clash_func = f_b;
+ gplugin_clash_func ();
+
+ /* call gmodule function form A
+ */
+ string = "gplugin_a_module_func";
+ g_print ("retrive symbol `%s' from \"%s\"\n", string, g_basename (g_module_name (module_a)));
+ if (!g_module_symbol (module_a, string, &gmod_f))
+ {
+ g_print ("error: %s\n", g_module_error ());
+ return 1;
+ }
+ g_print ("call plugin A's module function(%p):\n{\n", gmod_f);
+ gmod_f (module_b);
+ g_print ("}\n");
+
+
+ /* unload plugins
+ */
+ g_print ("unload plugin A:\n");
+ if (!g_module_close (module_a))
+ g_print ("error: %s\n", g_module_error ());
+ g_print ("unload plugin B:\n");
+ if (!g_module_close (module_b))
+ g_print ("error: %s\n", g_module_error ());
+
+ return 0;
+}
projects / platform / upstream / glib.git / commitdiff