Dogcows Code - chaz/openbox/blob - openbox/plugin.c

   1 #include <glib.h>
   2 #include <gmodule.h>
   3
   4 typedef void (*PluginStartup)();
   5 typedef void (*PluginShutdown)();
   6
   7 typedef struct {
   8     GModule *module;
   9     char *name;
  10
  11     PluginStartup startup;
  12     PluginShutdown shutdown;
  13 } Plugin;
  14
  15 static gpointer load_sym(GModule *module, char *name, char *symbol)
  16 {
  17     gpointer var = NULL;
  18     if (!g_module_symbol(module, symbol, &var))
  19         g_warning("Failed to load symbol '%s' from plugin '%s'", symbol, name);
  20     return var;
  21 }
  22
  23 static Plugin *plugin_new(char *name)
  24 {
  25     Plugin *p;
  26     char *path;
  27
  28     p = g_new(Plugin, 1);
  29
  30     path = g_build_filename(PLUGINDIR, name, NULL);
  31     p->module = g_module_open(path, G_MODULE_BIND_LAZY);
  32     g_free(path);
  33
  34     if (p->module == NULL) {
  35         path = g_build_filename(g_get_home_dir(), ".openbox", "plugins", name,
  36                                 NULL);
  37         p->module = g_module_open(path, G_MODULE_BIND_LAZY);
  38         g_free(path);
  39     }
  40
  41     if (p->module == NULL) {
  42         g_free(p);
  43         return NULL;
  44     }
  45
  46     p->startup = load_sym(p->module, name, "startup");
  47     p->shutdown = load_sym(p->module, name, "shutdown");
  48
  49     if (p->startup == NULL || p->shutdown == NULL) {
  50         g_module_close(p->module);
  51         g_free(p);
  52         return NULL;
  53     }
  54
  55     p->name = g_strdup(name);
  56     return p;
  57 }
  58
  59 static void plugin_free(Plugin *p)
  60 {
  61     p->shutdown();
  62
  63     g_free(p->name);
  64     g_module_close(p->module);
  65 }
  66
  67
  68 static GData *plugins = NULL;
  69
  70 void plugin_startup()
  71 {
  72     g_datalist_init(&plugins);
  73 }
  74
  75 void plugin_shutdown()
  76 {
  77     g_datalist_clear(&plugins);
  78 }
  79
  80 gboolean plugin_open(char *name)
  81 {
  82     Plugin *p;
  83
  84     if (g_datalist_get_data(&plugins, name) != NULL) {
  85         g_warning("plugin '%s' already loaded, can't load again", name);
  86         return TRUE;
  87     }
  88
  89     p = plugin_new(name);
  90     if (p == NULL) {
  91         g_warning("failed to load plugin '%s'", name);
  92         return FALSE;
  93     }
  94
  95     g_datalist_set_data_full(&plugins, name, p,  (GDestroyNotify) plugin_free);
  96     p->startup();
  97     return TRUE;
  98 }
  99
 100 void plugin_close(char *name)
 101 {
 102     g_datalist_remove_data(&plugins, name);
 103 }