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;
  18     if (!g_module_symbol(module, symbol, &var)) {
  19         g_warning("Failed to load symbol '%s' from plugin '%s'",
  20                   symbol, name);
  21         var = NULL;
  22     }
  23     return var;
  24 }
  25
  26 static Plugin *plugin_new(char *name)
  27 {
  28     Plugin *p;
  29     char *path;
  30
  31     p = g_new(Plugin, 1);
  32
  33     path = g_build_filename(PLUGINDIR, name, NULL);
  34     p->module = g_module_open(path, 0);
  35     g_free(path);
  36
  37     if (p->module == NULL) {
  38         path = g_build_filename(g_get_home_dir(), ".openbox", "plugins", name,
  39                                 NULL);
  40         p->module = g_module_open(path, 0);
  41         g_free(path);
  42     }
  43
  44     if (p->module == NULL) {
  45         g_free(p);
  46         return NULL;
  47     }
  48
  49     p->startup = (PluginStartup)load_sym(p->module, name, "plugin_startup");
  50     p->shutdown = (PluginShutdown)load_sym(p->module, name, "plugin_shutdown");
  51
  52     if (p->startup == NULL || p->shutdown == NULL) {
  53         g_module_close(p->module);
  54         g_free(p);
  55         return NULL;
  56     }
  57
  58     p->name = g_strdup(name);
  59     return p;
  60 }
  61
  62 static void plugin_free(Plugin *p)
  63 {
  64     p->shutdown();
  65
  66     g_free(p->name);
  67     g_module_close(p->module);
  68 }
  69
  70
  71 static GData *plugins = NULL;
  72
  73 void plugin_startup()
  74 {
  75     g_datalist_init(&plugins);
  76 }
  77
  78 void plugin_shutdown()
  79 {
  80     g_datalist_clear(&plugins);
  81 }
  82
  83 gboolean plugin_open(char *name)
  84 {
  85     Plugin *p;
  86
  87     if (g_datalist_get_data(&plugins, name) != NULL) {
  88         g_warning("plugin '%s' already loaded, can't load again", name);
  89         return TRUE;
  90     }
  91
  92     p = plugin_new(name);
  93     if (p == NULL) {
  94         g_warning("failed to load plugin '%s'", name);
  95         return FALSE;
  96     }
  97
  98     g_datalist_set_data_full(&plugins, name, p,  (GDestroyNotify) plugin_free);
  99     p->startup();
 100     return TRUE;
 101 }
 102
 103 void plugin_close(char *name)
 104 {
 105     g_datalist_remove_data(&plugins, name);
 106 }