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awesome/awesome.c

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/*
* awesome.c - awesome main functions
*
* Copyright © 2007-2008 Julien Danjou <julien@danjou.info>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#include "awesome.h"
#include "banning.h"
#include "common/atoms.h"
#include "common/backtrace.h"
#include "common/version.h"
#include "common/xutil.h"
#include "xkb.h"
#include "dbus.h"
#include "event.h"
#include "ewmh.h"
#include "globalconf.h"
#include "objects/client.h"
#include "objects/screen.h"
#include "spawn.h"
#include "systray.h"
#include "xwindow.h"
#include <getopt.h>
#include <locale.h>
#include <stdio.h>
#include <unistd.h>
#include <signal.h>
#include <sys/time.h>
#include <xcb/bigreq.h>
#include <xcb/randr.h>
#include <xcb/xcb_atom.h>
#include <xcb/xcb_aux.h>
#include <xcb/xcb_event.h>
#include <xcb/xinerama.h>
#include <xcb/xtest.h>
#include <xcb/shape.h>
#include <glib-unix.h>
awesome_t globalconf;
/** argv used to run awesome */
static char *awesome_argv;
/** time of last main loop wakeup */
static struct timeval last_wakeup;
/** current limit for the main loop's runtime */
static float main_loop_iteration_limit = 0.1;
/** Call before exiting.
*/
void
awesome_atexit(bool restart)
{
lua_State *L = globalconf_get_lua_State();
lua_pushboolean(L, restart);
signal_object_emit(L, &global_signals, "exit", 1);
/* Move clients where we want them to be and keep the stacking order intact */
foreach(c, globalconf.stack)
{
xcb_reparent_window(globalconf.connection, (*c)->window, globalconf.screen->root,
(*c)->geometry.x, (*c)->geometry.y);
}
/* Save the client order. This is useful also for "hard" restarts. */
xcb_window_t *wins = p_alloca(xcb_window_t, globalconf.clients.len);
int n = 0;
foreach(client, globalconf.clients)
wins[n++] = (*client)->window;
xcb_change_property(globalconf.connection, XCB_PROP_MODE_REPLACE,
globalconf.screen->root,
AWESOME_CLIENT_ORDER, XCB_ATOM_WINDOW, 32, n, wins);
a_dbus_cleanup();
systray_cleanup();
/* Close Lua */
lua_close(L);
/* X11 is a great protocol. There is a save-set so that reparenting WMs
* don't kill clients when they shut down. However, when a focused windows
* is saved, the focus will move to its parent with revert-to none.
* Immediately afterwards, this parent is destroyed and the focus is gone.
* Work around this by placing the focus where we like it to be.
*/
xcb_set_input_focus(globalconf.connection, XCB_INPUT_FOCUS_POINTER_ROOT,
XCB_NONE, XCB_CURRENT_TIME);
xcb_aux_sync(globalconf.connection);
xkb_free();
/* Disconnect *after* closing lua */
xcb_cursor_context_free(globalconf.cursor_ctx);
xcb_disconnect(globalconf.connection);
}
/** Restore the client order after a restart */
static void
restore_client_order(xcb_get_property_cookie_t prop_cookie)
{
int client_idx = 0;
xcb_window_t *windows;
xcb_get_property_reply_t *reply;
reply = xcb_get_property_reply(globalconf.connection, prop_cookie, NULL);
if (!reply || reply->format != 32 || reply->value_len == 0) {
p_delete(&reply);
return;
}
windows = xcb_get_property_value(reply);
for (uint32_t i = 0; i < reply->value_len; i++)
/* Find windows[i] and swap it to where it belongs */
foreach(c, globalconf.clients)
if ((*c)->window == windows[i])
{
client_t *tmp = *c;
*c = globalconf.clients.tab[client_idx];
globalconf.clients.tab[client_idx] = tmp;
client_idx++;
}
luaA_class_emit_signal(globalconf_get_lua_State(), &client_class, "list", 0);
p_delete(&reply);
}
/** Scan X to find windows to manage.
*/
static void
scan(xcb_query_tree_cookie_t tree_c)
{
int i, tree_c_len;
xcb_query_tree_reply_t *tree_r;
xcb_window_t *wins = NULL;
xcb_get_window_attributes_reply_t *attr_r;
xcb_get_geometry_reply_t *geom_r;
xcb_get_property_cookie_t prop_cookie;
long state;
tree_r = xcb_query_tree_reply(globalconf.connection,
tree_c,
NULL);
if(!tree_r)
return;
/* This gets the property and deletes it */
prop_cookie = xcb_get_property_unchecked(globalconf.connection, true,
globalconf.screen->root, AWESOME_CLIENT_ORDER,
XCB_ATOM_WINDOW, 0, UINT_MAX);
/* Get the tree of the children windows of the current root window */
if(!(wins = xcb_query_tree_children(tree_r)))
fatal("cannot get tree children");
tree_c_len = xcb_query_tree_children_length(tree_r);
xcb_get_window_attributes_cookie_t attr_wins[tree_c_len];
xcb_get_property_cookie_t state_wins[tree_c_len];
xcb_get_geometry_cookie_t geom_wins[tree_c_len];
for(i = 0; i < tree_c_len; i++)
{
attr_wins[i] = xcb_get_window_attributes_unchecked(globalconf.connection,
wins[i]);
state_wins[i] = xwindow_get_state_unchecked(wins[i]);
geom_wins[i] = xcb_get_geometry_unchecked(globalconf.connection, wins[i]);
}
for(i = 0; i < tree_c_len; i++)
{
attr_r = xcb_get_window_attributes_reply(globalconf.connection,
attr_wins[i],
NULL);
geom_r = xcb_get_geometry_reply(globalconf.connection, geom_wins[i], NULL);
state = xwindow_get_state_reply(state_wins[i]);
if(!geom_r || !attr_r || attr_r->override_redirect
|| attr_r->map_state == XCB_MAP_STATE_UNMAPPED
|| state == XCB_ICCCM_WM_STATE_WITHDRAWN)
{
p_delete(&attr_r);
p_delete(&geom_r);
continue;
}
client_manage(wins[i], geom_r, attr_r);
p_delete(&attr_r);
p_delete(&geom_r);
}
p_delete(&tree_r);
restore_client_order(prop_cookie);
}
static void
acquire_WM_Sn(bool replace)
{
xcb_intern_atom_cookie_t atom_q;
xcb_intern_atom_reply_t *atom_r;
char *atom_name;
xcb_get_selection_owner_reply_t *get_sel_reply;
xcb_client_message_event_t ev;
/* Get the WM_Sn atom */
globalconf.selection_owner_window = xcb_generate_id(globalconf.connection);
xcb_create_window(globalconf.connection, globalconf.screen->root_depth,
globalconf.selection_owner_window, globalconf.screen->root,
-1, -1, 1, 1, 0,
XCB_COPY_FROM_PARENT, globalconf.screen->root_visual,
0, NULL);
xwindow_set_class_instance(globalconf.selection_owner_window);
xwindow_set_name_static(globalconf.selection_owner_window,
"Awesome WM_Sn selection owner window");
atom_name = xcb_atom_name_by_screen("WM_S", globalconf.default_screen);
if(!atom_name)
fatal("error getting WM_Sn atom name");
atom_q = xcb_intern_atom_unchecked(globalconf.connection, false,
a_strlen(atom_name), atom_name);
p_delete(&atom_name);
atom_r = xcb_intern_atom_reply(globalconf.connection, atom_q, NULL);
if(!atom_r)
fatal("error getting WM_Sn atom");
globalconf.selection_atom = atom_r->atom;
p_delete(&atom_r);
/* Is the selection already owned? */
get_sel_reply = xcb_get_selection_owner_reply(globalconf.connection,
xcb_get_selection_owner(globalconf.connection, globalconf.selection_atom),
NULL);
if (!get_sel_reply)
fatal("GetSelectionOwner for WM_Sn failed");
if (!replace && get_sel_reply->owner != XCB_NONE)
fatal("another window manager is already running (selection owned; use --replace)");
/* Acquire the selection */
xcb_set_selection_owner(globalconf.connection, globalconf.selection_owner_window,
globalconf.selection_atom, XCB_CURRENT_TIME);
if (get_sel_reply->owner != XCB_NONE)
{
/* Wait for the old owner to go away */
xcb_get_geometry_reply_t *geom_reply = NULL;
do {
p_delete(&geom_reply);
geom_reply = xcb_get_geometry_reply(globalconf.connection,
xcb_get_geometry(globalconf.connection, get_sel_reply->owner),
NULL);
} while (geom_reply != NULL);
}
p_delete(&get_sel_reply);
/* Announce that we are the new owner */
p_clear(&ev, 1);
ev.response_type = XCB_CLIENT_MESSAGE;
ev.window = globalconf.screen->root;
ev.format = 32;
ev.type = MANAGER;
ev.data.data32[0] = XCB_CURRENT_TIME;
ev.data.data32[1] = globalconf.selection_atom;
ev.data.data32[2] = globalconf.selection_owner_window;
ev.data.data32[3] = ev.data.data32[4] = 0;
xcb_send_event(globalconf.connection, false, globalconf.screen->root, 0xFFFFFF, (char *) &ev);
}
static xcb_generic_event_t *poll_for_event(void)
{
if (globalconf.pending_event) {
xcb_generic_event_t *event = globalconf.pending_event;
globalconf.pending_event = NULL;
return event;
}
return xcb_poll_for_event(globalconf.connection);
}
static void
a_xcb_check(void)
{
xcb_generic_event_t *mouse = NULL, *event;
while((event = poll_for_event()))
{
/* We will treat mouse events later.
* We cannot afford to treat all mouse motion events,
* because that would be too much CPU intensive, so we just
* take the last we get after a bunch of events. */
if(XCB_EVENT_RESPONSE_TYPE(event) == XCB_MOTION_NOTIFY)
{
p_delete(&mouse);
mouse = event;
}
else
{
uint8_t type = XCB_EVENT_RESPONSE_TYPE(event);
if(mouse && (type == XCB_ENTER_NOTIFY || type == XCB_LEAVE_NOTIFY
|| type == XCB_BUTTON_PRESS || type == XCB_BUTTON_RELEASE))
{
/* Make sure enter/motion/leave/press/release events are handled
* in the correct order */
event_handle(mouse);
p_delete(&mouse);
}
event_handle(event);
p_delete(&event);
}
}
if(mouse)
{
event_handle(mouse);
p_delete(&mouse);
}
}
static gboolean
a_xcb_io_cb(GIOChannel *source, GIOCondition cond, gpointer data)
{
/* a_xcb_check() already handled all events */
if(xcb_connection_has_error(globalconf.connection))
fatal("X server connection broke (error %d)",
xcb_connection_has_error(globalconf.connection));
return TRUE;
}
static gint
a_glib_poll(GPollFD *ufds, guint nfsd, gint timeout)
{
guint res;
struct timeval now, length_time;
float length;
lua_State *L = globalconf_get_lua_State();
/* Do all deferred work now */
awesome_refresh();
/* Check if the Lua stack is the way it should be */
if (lua_gettop(L) != 0) {
warn("Something was left on the Lua stack, this is a bug!");
luaA_dumpstack(L);
lua_settop(L, 0);
}
/* Don't sleep if there is a pending event */
assert(globalconf.pending_event == NULL);
globalconf.pending_event = xcb_poll_for_event(globalconf.connection);
if (globalconf.pending_event != NULL)
timeout = 0;
/* Check how long this main loop iteration took */
gettimeofday(&now, NULL);
timersub(&now, &last_wakeup, &length_time);
length = length_time.tv_sec + length_time.tv_usec * 1.0f / 1e6;
if (length > main_loop_iteration_limit) {
warn("Last main loop iteration took %.6f seconds! Increasing limit for "
"this warning to that value.", length);
main_loop_iteration_limit = length;
}
/* Actually do the polling, record time of wakeup and check for new xcb events */
res = g_poll(ufds, nfsd, timeout);
gettimeofday(&last_wakeup, NULL);
a_xcb_check();
return res;
}
static void
signal_fatal(int signum)
{
buffer_t buf;
backtrace_get(&buf);
fatal("signal %d, dumping backtrace\n%s", signum, buf.s);
}
/** Function to exit on some signals.
* \param data currently unused
*/
static gboolean
exit_on_signal(gpointer data)
{
g_main_loop_quit(globalconf.loop);
return TRUE;
}
void
awesome_restart(void)
{
awesome_atexit(true);
a_exec(awesome_argv);
}
/** Function to restart awesome on some signals.
* \param data currently unused
*/
static gboolean
restart_on_signal(gpointer data)
{
awesome_restart();
return TRUE;
}
/** Print help and exit(2) with given exit_code.
* \param exit_code The exit code.
*/
static void __attribute__ ((noreturn))
exit_help(int exit_code)
{
FILE *outfile = (exit_code == EXIT_SUCCESS) ? stdout : stderr;
fprintf(outfile,
"Usage: awesome [OPTION]\n\
-h, --help show help\n\
-v, --version show version\n\
-c, --config FILE configuration file to use\n\
--search DIR add a directory to the library search path\n\
-k, --check check configuration file syntax\n\
-a, --no-argb disable client transparency support\n\
-r, --replace replace an existing window manager\n");
exit(exit_code);
}
/** Hello, this is main.
* \param argc Who knows.
* \param argv Who knows.
* \return EXIT_SUCCESS I hope.
*/
int
main(int argc, char **argv)
{
char *confpath = NULL;
string_array_t searchpath;
int xfd, i, opt;
ssize_t cmdlen = 1;
xdgHandle xdg;
bool no_argb = false;
bool run_test = false;
bool replace_wm = false;
xcb_query_tree_cookie_t tree_c;
static struct option long_options[] =
{
{ "help", 0, NULL, 'h' },
{ "version", 0, NULL, 'v' },
{ "config", 1, NULL, 'c' },
{ "check", 0, NULL, 'k' },
{ "search", 1, NULL, 's' },
{ "no-argb", 0, NULL, 'a' },
{ "replace", 0, NULL, 'r' },
{ NULL, 0, NULL, 0 }
};
/* Make stdout/stderr line buffered. */
setvbuf(stdout, NULL, _IOLBF, 0);
setvbuf(stderr, NULL, _IOLBF, 0);
/* clear the globalconf structure */
p_clear(&globalconf, 1);
globalconf.keygrabber = LUA_REFNIL;
globalconf.mousegrabber = LUA_REFNIL;
globalconf.exit_code = EXIT_SUCCESS;
buffer_init(&globalconf.startup_errors);
string_array_init(&searchpath);
/* save argv */
for(i = 0; i < argc; i++)
cmdlen += a_strlen(argv[i]) + 1;
awesome_argv = p_new(char, cmdlen);
a_strcpy(awesome_argv, cmdlen, argv[0]);
for(i = 1; i < argc; i++)
{
a_strcat(awesome_argv, cmdlen, " ");
a_strcat(awesome_argv, cmdlen, argv[i]);
}
/* Text won't be printed correctly otherwise */
setlocale(LC_CTYPE, "");
/* check args */
while((opt = getopt_long(argc, argv, "vhkc:ar",
long_options, NULL)) != -1)
switch(opt)
{
case 'v':
eprint_version();
break;
case 'h':
exit_help(EXIT_SUCCESS);
break;
case 'k':
run_test = true;
break;
case 'c':
if (confpath != NULL)
fatal("--config may only be specified once");
confpath = a_strdup(optarg);
break;
case 's':
string_array_append(&searchpath, a_strdup(optarg));
break;
case 'a':
no_argb = true;
break;
case 'r':
replace_wm = true;
break;
default:
exit_help(EXIT_FAILURE);
break;
}
/* Get XDG basedir data */
xdgInitHandle(&xdg);
/* init lua */
luaA_init(&xdg, &searchpath);
string_array_wipe(&searchpath);
if (run_test)
{
if(!luaA_parserc(&xdg, confpath, false))
{
fprintf(stderr, "✘ Configuration file syntax error.\n");
return EXIT_FAILURE;
}
else
{
fprintf(stderr, "✔ Configuration file syntax OK.\n");
return EXIT_SUCCESS;
}
}
/* register function for signals */
g_unix_signal_add(SIGINT, exit_on_signal, NULL);
g_unix_signal_add(SIGTERM, exit_on_signal, NULL);
g_unix_signal_add(SIGHUP, restart_on_signal, NULL);
struct sigaction sa = { .sa_handler = signal_fatal, .sa_flags = SA_RESETHAND };
sigemptyset(&sa.sa_mask);
sigaction(SIGABRT, &sa, 0);
sigaction(SIGBUS, &sa, 0);
sigaction(SIGFPE, &sa, 0);
sigaction(SIGILL, &sa, 0);
sigaction(SIGSEGV, &sa, 0);
/* We have no clue where the input focus is right now */
globalconf.focus.need_update = true;
/* set the default preferred icon size */
globalconf.preferred_icon_size = 0;
/* X stuff */
globalconf.connection = xcb_connect(NULL, &globalconf.default_screen);
if(xcb_connection_has_error(globalconf.connection))
fatal("cannot open display (error %d)", xcb_connection_has_error(globalconf.connection));
globalconf.screen = xcb_aux_get_screen(globalconf.connection, globalconf.default_screen);
globalconf.default_visual = draw_default_visual(globalconf.screen);
if(!no_argb)
globalconf.visual = draw_argb_visual(globalconf.screen);
if(!globalconf.visual)
globalconf.visual = globalconf.default_visual;
globalconf.default_depth = draw_visual_depth(globalconf.screen, globalconf.visual->visual_id);
globalconf.default_cmap = globalconf.screen->default_colormap;
if(globalconf.default_depth != globalconf.screen->root_depth)
{
// We need our own color map if we aren't using the default depth
globalconf.default_cmap = xcb_generate_id(globalconf.connection);
xcb_create_colormap(globalconf.connection, XCB_COLORMAP_ALLOC_NONE,
globalconf.default_cmap, globalconf.screen->root,
globalconf.visual->visual_id);
}
/* Prefetch all the extensions we might need */
xcb_prefetch_extension_data(globalconf.connection, &xcb_big_requests_id);
xcb_prefetch_extension_data(globalconf.connection, &xcb_test_id);
xcb_prefetch_extension_data(globalconf.connection, &xcb_randr_id);
xcb_prefetch_extension_data(globalconf.connection, &xcb_xinerama_id);
xcb_prefetch_extension_data(globalconf.connection, &xcb_shape_id);
if (xcb_cursor_context_new(globalconf.connection, globalconf.screen, &globalconf.cursor_ctx) < 0)
fatal("Failed to initialize xcb-cursor");
globalconf.xrmdb = xcb_xrm_database_from_default(globalconf.connection);
if (globalconf.xrmdb == NULL)
globalconf.xrmdb = xcb_xrm_database_from_string("");
if (globalconf.xrmdb == NULL)
fatal("Failed to initialize xcb-xrm");
/* Did we get some usable data from the above X11 setup? */
draw_test_cairo_xcb();
/* Acquire the WM_Sn selection */
acquire_WM_Sn(replace_wm);
/* initialize dbus */
a_dbus_init();
/* Get the file descriptor corresponding to the X connection */
xfd = xcb_get_file_descriptor(globalconf.connection);
GIOChannel *channel = g_io_channel_unix_new(xfd);
g_io_add_watch(channel, G_IO_IN, a_xcb_io_cb, NULL);
g_io_channel_unref(channel);
/* Grab server */
xcb_grab_server(globalconf.connection);
{
const uint32_t select_input_val = XCB_EVENT_MASK_SUBSTRUCTURE_REDIRECT;
xcb_void_cookie_t cookie;
/* This causes an error if some other window manager is running */
cookie = xcb_change_window_attributes_checked(globalconf.connection,
globalconf.screen->root,
XCB_CW_EVENT_MASK, &select_input_val);
if (xcb_request_check(globalconf.connection, cookie))
fatal("another window manager is already running (can't select SubstructureRedirect)");
}
/* Prefetch the maximum request length */
xcb_prefetch_maximum_request_length(globalconf.connection);
/* check for xtest extension */
const xcb_query_extension_reply_t *query;
query = xcb_get_extension_data(globalconf.connection, &xcb_test_id);
globalconf.have_xtest = query && query->present;
/* check for shape extension */
query = xcb_get_extension_data(globalconf.connection, &xcb_shape_id);
globalconf.have_shape = query && query->present;
event_init();
/* Allocate the key symbols */
globalconf.keysyms = xcb_key_symbols_alloc(globalconf.connection);
/* init atom cache */
atoms_init(globalconf.connection);
/* init screens information */
screen_scan();
/* do this only for real screen */
ewmh_init();
systray_init();
/* init spawn (sn) */
spawn_init();
/* init xkb */
xkb_init();
/* The default GC is just a newly created associated with a window with
* depth globalconf.default_depth.
* The window_no_focus is used for "nothing has the input focus". */
globalconf.focus.window_no_focus = xcb_generate_id(globalconf.connection);
globalconf.gc = xcb_generate_id(globalconf.connection);
xcb_create_window(globalconf.connection, globalconf.default_depth,
globalconf.focus.window_no_focus, globalconf.screen->root,
-1, -1, 1, 1, 0,
XCB_COPY_FROM_PARENT, globalconf.visual->visual_id,
XCB_CW_BACK_PIXEL | XCB_CW_BORDER_PIXEL |
XCB_CW_OVERRIDE_REDIRECT | XCB_CW_COLORMAP,
(const uint32_t [])
{
globalconf.screen->black_pixel,
globalconf.screen->black_pixel,
1,
globalconf.default_cmap
});
xwindow_set_class_instance(globalconf.focus.window_no_focus);
xwindow_set_name_static(globalconf.focus.window_no_focus, "Awesome no input window");
xcb_map_window(globalconf.connection, globalconf.focus.window_no_focus);
xcb_create_gc(globalconf.connection, globalconf.gc, globalconf.focus.window_no_focus,
XCB_GC_FOREGROUND | XCB_GC_BACKGROUND,
(const uint32_t[]) { globalconf.screen->black_pixel, globalconf.screen->white_pixel });
/* Get the window tree associated to this screen */
tree_c = xcb_query_tree_unchecked(globalconf.connection,
globalconf.screen->root);
xcb_change_window_attributes(globalconf.connection,
globalconf.screen->root,
XCB_CW_EVENT_MASK,
ROOT_WINDOW_EVENT_MASK);
/* we will receive events, stop grabbing server */
xcb_ungrab_server(globalconf.connection);
xcb_flush(globalconf.connection);
/* get the current wallpaper, from now on we are informed when it changes */
root_update_wallpaper();
/* Parse and run configuration file */
if (!luaA_parserc(&xdg, confpath, true))
fatal("couldn't find any rc file");
p_delete(&confpath);
xdgWipeHandle(&xdg);
/* scan existing windows */
scan(tree_c);
luaA_emit_startup();
/* Setup the main context */
g_main_context_set_poll_func(g_main_context_default(), &a_glib_poll);
gettimeofday(&last_wakeup, NULL);
/* main event loop (if not NULL, awesome.quit() was already called) */
if (globalconf.loop == NULL)
{
globalconf.loop = g_main_loop_new(NULL, FALSE);
g_main_loop_run(globalconf.loop);
}
g_main_loop_unref(globalconf.loop);
globalconf.loop = NULL;
awesome_atexit(false);
return globalconf.exit_code;
}
// vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:textwidth=80
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