int main(int argc, char **argv)
{
xcb_connection_t *connection = xcb_connect(NULL, &wm_conf.default_screen_num);
if (xcb_connection_has_error(connection)) {
fprintf(stderr, "failed to open display\n");
exit(1);
}
init_wm_conf();
init_conf_dir();
wm_conf.connection = connection;
const xcb_setup_t *setup = xcb_get_setup(connection);
int num_screens = xcb_setup_roots_length(setup);
fprintf(stderr, "init: num_screens = %d\n", num_screens);
fprintf(stderr, "init: default_screen_num = %d\n", wm_conf.default_screen_num);
xcb_screen_t *screen = xcb_setup_roots_iterator(xcb_get_setup(connection)).data;
wm_conf.screen = screen;
xcb_window_t root_window = screen->root;
xcb_grab_server(connection);
xcb_flush(connection);
xcb_event_handlers_t *event_handlers = &wm_conf.event_handlers;
xcb_event_handlers_init(connection, event_handlers);
set_exclusive_error_handler(event_handlers, handle_startup_error);
/* Try to get substructure redirect events from root window.
* This will cause an error if a window manager is already running.
*/
const uint32_t sub_redirect = XCB_EVENT_MASK_SUBSTRUCTURE_REDIRECT;
xcb_change_window_attributes(connection,
root_window,
XCB_CW_EVENT_MASK,
&sub_redirect);
/* Need to xcb_flush to validate error handler */
xcb_aux_sync(connection);
/* Process all errors in the queue if any */
xcb_event_poll_for_event_loop(event_handlers);
scan_windows();
xinerama_test();
set_exclusive_error_handler(event_handlers, handle_error);
set_event_handlers(event_handlers);
/* Allocate the key symbols */
wm_conf.key_syms = xcb_key_symbols_alloc(connection);
fprintf(stderr, "selecting events from root window\n");
const uint32_t root_win_event_mask = XCB_EVENT_MASK_SUBSTRUCTURE_REDIRECT |
XCB_EVENT_MASK_SUBSTRUCTURE_NOTIFY |
XCB_EVENT_MASK_ENTER_WINDOW |
XCB_EVENT_MASK_LEAVE_WINDOW |
XCB_EVENT_MASK_STRUCTURE_NOTIFY |
XCB_EVENT_MASK_PROPERTY_CHANGE |
XCB_EVENT_MASK_BUTTON_PRESS |
XCB_EVENT_MASK_BUTTON_RELEASE |
XCB_EVENT_MASK_FOCUS_CHANGE;
xcb_change_window_attributes(connection, root_window, XCB_CW_EVENT_MASK, &root_win_event_mask);
xcb_ungrab_server(connection);
xcb_flush(connection);
wm_conf.repl_server = repl_server_init();
load_init_scheme();
fprintf(stderr, "entering event loop\n");
event_loop();
xcb_disconnect(connection);
return 0;
}
int
main(int argc, char **argv)
{
memset(&globalconf, 0, sizeof(globalconf));
globalconf.connection = xcb_connect(NULL, &globalconf.screen_nbr);
if(xcb_connection_has_error(globalconf.connection))
fatal("Cannot open display");
/* Get the root window */
globalconf.screen = xcb_aux_get_screen(globalconf.connection,
globalconf.screen_nbr);
/* Set up signal handlers and function called on normal exit */
struct sigaction sa;
sigemptyset(&sa.sa_mask);
sa.sa_handler = exit_on_signal;
sa.sa_flags = 0;
sigaction(SIGHUP, &sa, NULL);
sigaction(SIGINT, &sa, NULL);
sigaction(SIGTERM, &sa, NULL);
atexit(exit_cleanup);
/**
* First round-trip
*/
/* Send requests for EWMH atoms initialisation */
xcb_intern_atom_cookie_t *ewmh_cookies = atoms_init();
parse_command_line_parameters(argc, argv);
/* Prefetch the extensions data */
xcb_prefetch_extension_data(globalconf.connection, &xcb_composite_id);
xcb_prefetch_extension_data(globalconf.connection, &xcb_damage_id);
xcb_prefetch_extension_data(globalconf.connection, &xcb_xfixes_id);
/* Initialise errors handlers */
xcb_event_handlers_init(globalconf.connection, &globalconf.evenths);
event_init_start_handlers();
/* Pre-initialisation of the rendering backend */
if(!rendering_load())
{
free(ewmh_cookies);
fatal("Can't initialise rendering backend");
}
/* Get replies for EWMH atoms initialisation */
if(!atoms_init_finalise(ewmh_cookies))
/* No need to free ewmh_cookies in case of error as it's already
handles by xcb-ewmh when getting the replies */
fatal("Cannot initialise atoms");
/* First check whether there is already a Compositing Manager (ICCCM) */
xcb_get_selection_owner_cookie_t wm_cm_owner_cookie =
xcb_ewmh_get_wm_cm_owner(&globalconf.ewmh, globalconf.screen_nbr);
/**
* Second round-trip
*/
/* Initialise extensions based on the cache and perform
initialisation of the rendering backend */
display_init_extensions();
if(!(*globalconf.rendering->init)())
return EXIT_FAILURE;
/* Check ownership for WM_CM_Sn before actually claiming it (ICCCM) */
xcb_window_t wm_cm_owner_win;
if(xcb_ewmh_get_wm_cm_owner_reply(&globalconf.ewmh, wm_cm_owner_cookie,
&wm_cm_owner_win, NULL) &&
wm_cm_owner_win != XCB_NONE)
fatal("A compositing manager is already active (window=%jx)",
(uintmax_t) wm_cm_owner_win);
/* Now send requests to register the CM */
display_register_cm();
/**
* Third round-trip
*/
/* Check extensions version and finish initialisation of the
rendering backend */
display_init_extensions_finalise();
if(!(*globalconf.rendering->init_finalise)())
return EXIT_FAILURE;
/* All the plugins given in the configuration file */
plugin_load_all();
/* Validate errors and get PropertyNotify needed to acquire
_NET_WM_CM_Sn ownership */
xcb_aux_sync(globalconf.connection);
xcb_event_poll_for_event_loop(&globalconf.evenths);
globalconf.keysyms = xcb_key_symbols_alloc(globalconf.connection);
xcb_get_modifier_mapping_cookie_t key_mapping_cookie =
xcb_get_modifier_mapping_unchecked(globalconf.connection);
/* Finish CM X registration */
if(!display_register_cm_finalise())
fatal("Could not acquire _NET_WM_CM_Sn ownership");
/**
* Last initialisation round-trip
*/
/* Grab the server before performing redirection and get the tree of
windows to ensure there won't be anything else at the same
time */
xcb_grab_server(globalconf.connection);
/* Now redirect windows and add existing windows */
display_init_redirect();
/* Validate errors handlers during redirect */
xcb_aux_sync(globalconf.connection);
xcb_event_poll_for_event_loop(&globalconf.evenths);
/* Manage existing windows */
display_init_redirect_finalise();
xcb_ungrab_server(globalconf.connection);
/* Check the plugin requirements which will disable plugins which
don't meet the requirements */
plugin_check_requirements();
/* Get the lock masks reply of the request previously sent */
key_lock_mask_get_reply(key_mapping_cookie);
/* Initialise normal errors and events handlers */
event_init_handlers();
xcb_generic_event_t *event;
/* Flush existing requests before the loop as DamageNotify events
may have been received in the meantime */
xcb_flush(globalconf.connection);
globalconf.do_repaint = true;
/* Main event and error loop */
do
{
/* Block until an event is received */
event = xcb_wait_for_event(globalconf.connection);
/* Check X connection to avoid SIGSEGV */
if(xcb_connection_has_error(globalconf.connection))
fatal("X connection invalid");
xcb_event_handle(&globalconf.evenths, event);
free(event);
/* Then process all remaining events in the queue because before
painting, all the DamageNotify have to be received */
xcb_event_poll_for_event_loop(&globalconf.evenths);
/* Now paint the windows */
if(globalconf.do_repaint)
{
window_t *windows = NULL;
for(plugin_t *plugin = globalconf.plugins; plugin; plugin = plugin->next)
if(plugin->enable && plugin->vtable->render_windows &&
(windows = (*plugin->vtable->render_windows)()))
break;
if(!windows)
windows = globalconf.windows;
window_paint_all(windows);
xcb_aux_sync(globalconf.connection);
}
globalconf.do_repaint = false;
}
while(true);
return EXIT_SUCCESS;
}
