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

   1 #include "plugins/interface.h"
   2 #include "parser/parse.h"
   3
   4 #include <glib.h>
   5 #include <gmodule.h>
   6
   7 typedef struct {
   8     GModule *module;
   9     char *name;
  10
  11     PluginSetupConfig config;
  12     PluginStartup startup;
  13     PluginShutdown shutdown;
  14     PluginCreate create;
  15     PluginDestroy destroy;
  16 } Plugin;
  17
  18 static gpointer load_sym(GModule *module, char *name, char *symbol,
  19                          gboolean allow_fail)
  20 {
  21     gpointer var;
  22     if (!g_module_symbol(module, symbol, &var)) {
  23         if (!allow_fail)
  24             g_warning("Failed to load symbol '%s' from plugin '%s'",
  25                       symbol, name);
  26         var = NULL;
  27     }
  28     return var;
  29 }
  30
  31 static Plugin *plugin_new(char *name)
  32 {
  33     Plugin *p;
  34     char *path;
  35
  36     p = g_new(Plugin, 1);
  37
  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     if (p->module == NULL) {
  44         path = g_build_filename(PLUGINDIR, name, NULL);
  45         p->module = g_module_open(path, 0);
  46         g_free(path);
  47     }
  48
  49     if (p->module == NULL) {
  50         g_warning(g_module_error());
  51         g_free(p);
  52         return NULL;
  53     }
  54
  55     p->config = (PluginSetupConfig)load_sym(p->module, name,
  56                                             "plugin_setup_config", FALSE);
  57     p->startup = (PluginStartup)load_sym(p->module, name, "plugin_startup",
  58                                          FALSE);
  59     p->shutdown = (PluginShutdown)load_sym(p->module, name, "plugin_shutdown",
  60                                            FALSE);
  61     p->create = (PluginCreate)load_sym(p->module, name, "plugin_create", TRUE);
  62     p->destroy = (PluginDestroy)load_sym(p->module, name, "plugin_destroy",
  63                                          TRUE);
  64
  65     if (p->config == NULL || p->startup == NULL || p->shutdown == NULL) {
  66         g_module_close(p->module);
  67         g_free(p);
  68         return NULL;
  69     }
  70
  71     p->name = g_strdup(name);
  72     return p;
  73 }
  74
  75 static void plugin_free(Plugin *p)
  76 {
  77     p->shutdown();
  78
  79     g_free(p->name);
  80     g_module_close(p->module);
  81 }
  82
  83
  84 static GData *plugins = NULL;
  85
  86 void plugin_startup()
  87 {
  88     g_datalist_init(&plugins);
  89 }
  90
  91 void plugin_shutdown()
  92 {
  93     g_datalist_clear(&plugins);
  94 }
  95
  96 gboolean plugin_open_full(char *name, gboolean reopen, ObParseInst *i)
  97 {
  98     Plugin *p;
  99
 100     if (g_datalist_get_data(&plugins, name) != NULL) {
 101         if (!reopen)
 102             g_warning("plugin '%s' already loaded, can't load again", name);
 103         return TRUE;
 104     }
 105
 106     p = plugin_new(name);
 107     if (p == NULL) {
 108         g_warning("failed to load plugin '%s'", name);
 109         return FALSE;
 110     }
 111     p->config(i);
 112
 113     g_datalist_set_data_full(&plugins, name, p, (GDestroyNotify) plugin_free);
 114     return TRUE;
 115 }
 116
 117 gboolean plugin_open(char *name, ObParseInst *i) {
 118     return plugin_open_full(name, FALSE, i);
 119 }
 120
 121 gboolean plugin_open_reopen(char *name, ObParseInst *i) {
 122     return plugin_open_full(name, TRUE, i);
 123 }
 124
 125 void plugin_close(char *name)
 126 {
 127     g_datalist_remove_data(&plugins, name);
 128 }
 129
 130 static void foreach_start(GQuark key, Plugin *p, gpointer *foo)
 131 {
 132     p->startup();
 133 }
 134
 135 void plugin_startall()
 136 {
 137     g_datalist_foreach(&plugins, (GDataForeachFunc)foreach_start, NULL);
 138 }
 139
 140 void plugin_loadall(ObParseInst *i)
 141 {
 142     GIOChannel *io;
 143     GError *err;
 144     char *path, *name;
 145
 146     path = g_build_filename(g_get_home_dir(), ".openbox", "pluginrc", NULL);
 147     err = NULL;
 148     io = g_io_channel_new_file(path, "r", &err);
 149     g_free(path);
 150
 151     if (io == NULL) {
 152         path = g_build_filename(RCDIR, "pluginrc", NULL);
 153         err = NULL;
 154         io = g_io_channel_new_file(path, "r", &err);
 155         g_free(path);
 156     }
 157
 158     if (io == NULL) {
 159         /* load the default plugins */
 160         plugin_open("placement", i);
 161         plugin_open("resistance", i);
 162
 163         /* XXX rm me when the parser loads me magically */
 164         plugin_open("client_menu", i);
 165     } else {
 166         /* load the plugins in the rc file */
 167         while (g_io_channel_read_line(io, &name, NULL, NULL, &err) ==
 168                G_IO_STATUS_NORMAL) {
 169             g_strstrip(name);
 170             if (name[0] != '\0' && name[0] != '#')
 171                 plugin_open(name, i);
 172             g_free(name);
 173         }
 174         g_io_channel_unref(io);
 175     }
 176 }
 177
 178 void *plugin_create(char *name, void *data)
 179 {
 180     Plugin *p = (Plugin *)g_datalist_get_data(&plugins, name);
 181
 182     if (p == NULL) {
 183         g_warning("Unable to find plugin for create: %s", name);
 184         return NULL;
 185     }
 186
 187     if (p->create == NULL || p->destroy == NULL) {
 188         g_critical("Unsupported create/destroy: %s", name);
 189         return NULL;
 190     }
 191
 192     return p->create(data);
 193 }
 194
 195 void plugin_destroy(char *name, void *data)
 196 {
 197     Plugin *p = (Plugin *)g_datalist_get_data(&plugins, name);
 198
 199     if (p == NULL) {
 200         g_critical("Unable to find plugin for destroy: %s", name);
 201         /* really shouldn't happen, but attempt to free something anyway? */
 202         g_free(data);
 203         return;
 204     }
 205
 206     if (p->destroy == NULL || p->create == NULL) {
 207         g_critical("Unsupported create/destroy: %s", name);
 208         /* really, really shouldn't happen, but attempt to free anyway? */
 209         g_free(data);
 210         return;
 211     }
 212
 213     p->destroy(data);
 214 }