openbox/engine.c

   1 #include "engine.h"
   2
   3 #include <glib.h>
   4 #include <gmodule.h>
   5 #ifdef HAVE_STDLIB_H
   6 #  include <stdlib.h>
   7 #endif
   8
   9 static GModule *module;
  10 static EngineStartup *estartup;
  11 static EngineShutdown *eshutdown;
  12
  13 #define LOADSYM(name, var) \
  14     if (!g_module_symbol(module, #name, (gpointer*)&var)) { \
  15         g_warning("Failed to load symbol %s from engine", #name); \
  16         return FALSE; \
  17     }
  18
  19 static gboolean load(char *name)
  20 {
  21     char *path;
  22
  23     g_assert(module == NULL);
  24
  25     path = g_build_filename(ENGINEDIR, name, NULL);
  26     module = g_module_open(path, 0);
  27     g_free(path);
  28
  29     if (module == NULL) {
  30         path = g_build_filename(g_get_home_dir(), ".openbox", "engines", name,
  31                                 NULL);
  32         module = g_module_open(path, 0);
  33         g_free(path);
  34     }
  35
  36     if (module == NULL)
  37         return FALSE;
  38
  39     /* load the engine's symbols */
  40     LOADSYM(startup, estartup);
  41     LOADSYM(shutdown, eshutdown);
  42     LOADSYM(frame_new, engine_frame_new);
  43     LOADSYM(frame_grab_client, engine_frame_grab_client);
  44     LOADSYM(frame_release_client, engine_frame_release_client);
  45     LOADSYM(frame_adjust_size, engine_frame_adjust_size);
  46     LOADSYM(frame_adjust_position, engine_frame_adjust_position);
  47     LOADSYM(frame_adjust_shape, engine_frame_adjust_shape);
  48     LOADSYM(frame_adjust_state, engine_frame_adjust_state);
  49     LOADSYM(frame_adjust_focus, engine_frame_adjust_focus);
  50     LOADSYM(frame_adjust_title, engine_frame_adjust_title);
  51     LOADSYM(frame_adjust_icon, engine_frame_adjust_icon);
  52     LOADSYM(frame_show, engine_frame_show);
  53     LOADSYM(frame_hide, engine_frame_hide);
  54     LOADSYM(get_context, engine_get_context);
  55
  56     if (!estartup())
  57         return FALSE;
  58
  59     return TRUE;
  60 }
  61
  62 void engine_startup(char *engine)
  63 {
  64     module = NULL;
  65
  66     if (engine != NULL) {
  67         if (load(engine))
  68             return;
  69         g_warning("Failed to load the engine '%s'", engine);
  70         g_message("Falling back to the default: '%s'", DEFAULT_ENGINE);
  71     }
  72     if (!load(DEFAULT_ENGINE)) {
  73         g_critical("Failed to load the engine '%s'. Aborting", DEFAULT_ENGINE);
  74         exit(1);
  75     }
  76 }
  77
  78 void engine_shutdown()
  79 {
  80     if (module != NULL) {
  81         eshutdown();
  82         g_module_close(module);
  83     }
  84 }