src/bspwm.c

   1 /* Copyright (c) 2012, Bastien Dejean
   2  * All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions are met:
   6  *
   7  * 1. Redistributions of source code must retain the above copyright notice, this
   8  *    list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright notice,
  10  *    this list of conditions and the following disclaimer in the documentation
  11  *    and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
  14  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  15  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  16  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
  17  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  18  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  19  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  20  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  21  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  22  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  23  */
  24
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <sys/stat.h>
  28 #include <sys/types.h>
  29 #include <sys/time.h>
  30 #include <sys/wait.h>
  31 #include <sys/socket.h>
  32 #include <sys/un.h>
  33 #include <signal.h>
  34 #include <unistd.h>
  35 #include <stdbool.h>
  36 #include <string.h>
  37 #include <xcb/xinerama.h>
  38 #include "types.h"
  39 #include "desktop.h"
  40 #include "monitor.h"
  41 #include "settings.h"
  42 #include "messages.h"
  43 #include "pointer.h"
  44 #include "events.h"
  45 #include "common.h"
  46 #include "window.h"
  47 #include "history.h"
  48 #include "ewmh.h"
  49 #include "rule.h"
  50 #include "restore.h"
  51 #include "query.h"
  52 #include "bspwm.h"
  53
  54 xcb_connection_t *dpy;
  55 int default_screen, screen_width, screen_height;
  56 uint32_t clients_count;
  57 xcb_screen_t *screen;
  58 xcb_window_t root;
  59 char config_path[MAXLEN];
  60
  61 monitor_t *mon;
  62 monitor_t *mon_head;
  63 monitor_t *mon_tail;
  64 monitor_t *pri_mon;
  65 history_t *history_head;
  66 history_t *history_tail;
  67 history_t *history_needle;
  68 rule_t *rule_head;
  69 rule_t *rule_tail;
  70 stacking_list_t *stack_head;
  71 stacking_list_t *stack_tail;
  72 subscriber_list_t *subscribe_head;
  73 subscriber_list_t *subscribe_tail;
  74 pending_rule_t *pending_rule_head;
  75 pending_rule_t *pending_rule_tail;
  76
  77 xcb_window_t meta_window;
  78 motion_recorder_t motion_recorder;
  79 xcb_atom_t WM_STATE;
  80 xcb_atom_t WM_TAKE_FOCUS;
  81 xcb_atom_t WM_DELETE_WINDOW;
  82 int exit_status;
  83
  84 bool auto_raise;
  85 bool sticky_still;
  86 bool hide_sticky;
  87 bool record_history;
  88 bool running;
  89 bool restart;
  90 bool randr;
  91
  92 int main(int argc, char *argv[])
  93 {
  94         fd_set descriptors;
  95         char socket_path[MAXLEN];
  96         char state_path[MAXLEN] = {0};
  97         int run_level = 0;
  98         config_path[0] = '\0';
  99         int sock_fd = -1, cli_fd, dpy_fd, max_fd, n;
 100         struct sockaddr_un sock_address;
 101         char msg[BUFSIZ] = {0};
 102         xcb_generic_event_t *event;
 103         char *end;
 104         int opt;
 105
 106         while ((opt = getopt(argc, argv, "hvc:s:o:")) != -1) {
 107                 switch (opt) {
 108                         case 'h':
 109                                 printf(WM_NAME " [-h|-v|-c CONFIG_PATH]\n");
 110                                 exit(EXIT_SUCCESS);
 111                                 break;
 112                         case 'v':
 113                                 printf("%s\n", VERSION);
 114                                 exit(EXIT_SUCCESS);
 115                                 break;
 116                         case 'c':
 117                                 snprintf(config_path, sizeof(config_path), "%s", optarg);
 118                                 break;
 119                         case 's':
 120                                 run_level |= 1;
 121                                 snprintf(state_path, sizeof(state_path), "%s", optarg);
 122                                 break;
 123                         case 'o':
 124                                 run_level |= 2;
 125                                 sock_fd = strtol(optarg, &end, 0);
 126                                 if (*end != '\0') {
 127                                         sock_fd = -1;
 128                                 }
 129                                 break;
 130                 }
 131         }
 132
 133         if (config_path[0] == '\0') {
 134                 char *config_home = getenv(CONFIG_HOME_ENV);
 135                 if (config_home != NULL) {
 136                         snprintf(config_path, sizeof(config_path), "%s/%s/%s", config_home, WM_NAME, CONFIG_NAME);
 137                 } else {
 138                         snprintf(config_path, sizeof(config_path), "%s/%s/%s/%s", getenv("HOME"), ".config", WM_NAME, CONFIG_NAME);
 139                 }
 140         }
 141
 142         dpy = xcb_connect(NULL, &default_screen);
 143
 144         if (!check_connection(dpy)) {
 145                 exit(EXIT_FAILURE);
 146         }
 147
 148         load_settings();
 149         setup();
 150
 151         if (state_path[0] != '\0') {
 152                 restore_state(state_path);
 153                 unlink(state_path);
 154         }
 155
 156         dpy_fd = xcb_get_file_descriptor(dpy);
 157
 158         if (sock_fd == -1) {
 159                 char *sp = getenv(SOCKET_ENV_VAR);
 160                 if (sp != NULL) {
 161                         snprintf(socket_path, sizeof(socket_path), "%s", sp);
 162                 } else {
 163                         char *host = NULL;
 164                         int dn = 0, sn = 0;
 165                         if (xcb_parse_display(NULL, &host, &dn, &sn) != 0) {
 166                                 snprintf(socket_path, sizeof(socket_path), SOCKET_PATH_TPL, host, dn, sn);
 167                         }
 168                         free(host);
 169                 }
 170
 171                 sock_address.sun_family = AF_UNIX;
 172                 if (snprintf(sock_address.sun_path, sizeof(sock_address.sun_path), "%s", socket_path) < 0) {
 173                         err("Couldn't write the socket path.\n");
 174                 }
 175
 176                 sock_fd = socket(AF_UNIX, SOCK_STREAM, 0);
 177
 178                 if (sock_fd == -1) {
 179                         err("Couldn't create the socket.\n");
 180                 }
 181
 182                 unlink(socket_path);
 183
 184                 if (bind(sock_fd, (struct sockaddr *) &sock_address, sizeof(sock_address)) == -1) {
 185                         err("Couldn't bind a name to the socket.\n");
 186                 }
 187
 188                 if (listen(sock_fd, SOMAXCONN) == -1) {
 189                         err("Couldn't listen to the socket.\n");
 190                 }
 191         }
 192
 193         signal(SIGINT, sig_handler);
 194         signal(SIGHUP, sig_handler);
 195         signal(SIGTERM, sig_handler);
 196         signal(SIGCHLD, sig_handler);
 197         signal(SIGPIPE, SIG_IGN);
 198         run_config(run_level);
 199         running = true;
 200
 201         while (running) {
 202
 203                 xcb_flush(dpy);
 204
 205                 FD_ZERO(&descriptors);
 206                 FD_SET(sock_fd, &descriptors);
 207                 FD_SET(dpy_fd, &descriptors);
 208                 max_fd = MAX(sock_fd, dpy_fd);
 209
 210                 for (pending_rule_t *pr = pending_rule_head; pr != NULL; pr = pr->next) {
 211                         FD_SET(pr->fd, &descriptors);
 212                         if (pr->fd > max_fd) {
 213                                 max_fd = pr->fd;
 214                         }
 215                 }
 216
 217                 if (select(max_fd + 1, &descriptors, NULL, NULL, NULL) > 0) {
 218
 219                         pending_rule_t *pr = pending_rule_head;
 220                         while (pr != NULL) {
 221                                 pending_rule_t *next = pr->next;
 222                                 if (FD_ISSET(pr->fd, &descriptors)) {
 223                                         if (manage_window(pr->win, pr->csq, pr->fd)) {
 224                                                 for (event_queue_t *eq = pr->event_head; eq != NULL; eq = eq->next) {
 225                                                         handle_event(&eq->event);
 226                                                 }
 227                                         }
 228                                         remove_pending_rule(pr);
 229                                 }
 230                                 pr = next;
 231                         }
 232
 233                         if (FD_ISSET(sock_fd, &descriptors)) {
 234                                 cli_fd = accept(sock_fd, NULL, 0);
 235                                 if (cli_fd > 0 && (n = recv(cli_fd, msg, sizeof(msg)-1, 0)) > 0) {
 236                                         msg[n] = '\0';
 237                                         FILE *rsp = fdopen(cli_fd, "w");
 238                                         if (rsp != NULL) {
 239                                                 handle_message(msg, n, rsp);
 240                                         } else {
 241                                                 warn("Can't open the client socket as file.\n");
 242                                                 close(cli_fd);
 243                                         }
 244                                 }
 245                         }
 246
 247                         if (FD_ISSET(dpy_fd, &descriptors)) {
 248                                 while ((event = xcb_poll_for_event(dpy)) != NULL) {
 249                                         handle_event(event);
 250                                         free(event);
 251                                 }
 252                         }
 253
 254                 }
 255
 256                 if (!check_connection(dpy)) {
 257                         running = false;
 258                 }
 259
 260                 prune_dead_subscribers();
 261         }
 262
 263         if (restart) {
 264                 char *host = NULL;
 265                 int dn = 0, sn = 0;
 266                 if (xcb_parse_display(NULL, &host, &dn, &sn) != 0) {
 267                         snprintf(state_path, sizeof(state_path), STATE_PATH_TPL, host, dn, sn);
 268                 }
 269                 free(host);
 270                 FILE *f = fopen(state_path, "w");
 271                 query_state(f);
 272                 fclose(f);
 273         }
 274
 275         cleanup();
 276         ungrab_buttons();
 277         xcb_ewmh_connection_wipe(ewmh);
 278         xcb_destroy_window(dpy, meta_window);
 279         xcb_destroy_window(dpy, motion_recorder.id);
 280         free(ewmh);
 281         xcb_flush(dpy);
 282         xcb_disconnect(dpy);
 283
 284         if (restart) {
 285                 int rargc;
 286                 for (rargc = 0; rargc < argc; rargc++) {
 287                         if (streq("-s", argv[rargc])) {
 288                                 break;
 289                         }
 290                 }
 291
 292                 int len = rargc + 5;
 293                 char **rargv = malloc(len * sizeof(char *));
 294
 295                 for (int i = 0; i < rargc; i++) {
 296                         rargv[i] = argv[i];
 297                 }
 298
 299                 char sock_fd_arg[SMALEN];
 300                 snprintf(sock_fd_arg, sizeof(sock_fd_arg), "%i", sock_fd);
 301
 302                 rargv[rargc] = "-s";
 303                 rargv[rargc + 1] = state_path;
 304                 rargv[rargc + 2] = "-o";
 305                 rargv[rargc + 3] = sock_fd_arg;
 306                 rargv[rargc + 4] = 0;
 307
 308                 exit_status = execvp(*rargv, rargv);
 309                 free(rargv);
 310         }
 311
 312         close(sock_fd);
 313         unlink(socket_path);
 314
 315         return exit_status;
 316 }
 317
 318 void init(void)
 319 {
 320         clients_count = 0;
 321         mon = mon_head = mon_tail = pri_mon = NULL;
 322         history_head = history_tail = history_needle = NULL;
 323         rule_head = rule_tail = NULL;
 324         stack_head = stack_tail = NULL;
 325         subscribe_head = subscribe_tail = NULL;
 326         pending_rule_head = pending_rule_tail = NULL;
 327         auto_raise = sticky_still = hide_sticky = record_history = true;
 328         randr_base = 0;
 329         exit_status = 0;
 330         restart = false;
 331 }
 332
 333 void setup(void)
 334 {
 335         init();
 336         ewmh_init();
 337         pointer_init();
 338
 339         screen = xcb_setup_roots_iterator(xcb_get_setup(dpy)).data;
 340
 341         if (screen == NULL) {
 342                 err("Can't acquire the default screen.\n");
 343         }
 344
 345         root = screen->root;
 346         register_events();
 347
 348         screen_width = screen->width_in_pixels;
 349         screen_height = screen->height_in_pixels;
 350
 351         meta_window = xcb_generate_id(dpy);
 352         xcb_create_window(dpy, XCB_COPY_FROM_PARENT, meta_window, root, -1, -1, 1, 1, 0, XCB_WINDOW_CLASS_INPUT_ONLY, XCB_COPY_FROM_PARENT, XCB_NONE, NULL);
 353         xcb_icccm_set_wm_class(dpy, meta_window, sizeof(META_WINDOW_IC), META_WINDOW_IC);
 354
 355         motion_recorder.id = xcb_generate_id(dpy);
 356         motion_recorder.sequence = 0;
 357         motion_recorder.enabled = false;
 358         uint32_t values[] = {XCB_EVENT_MASK_STRUCTURE_NOTIFY | XCB_EVENT_MASK_POINTER_MOTION};
 359         xcb_create_window(dpy, XCB_COPY_FROM_PARENT, motion_recorder.id, root, 0, 0, 1, 1, 0,
 360                           XCB_WINDOW_CLASS_INPUT_ONLY, XCB_COPY_FROM_PARENT, XCB_CW_EVENT_MASK, values);
 361         xcb_icccm_set_wm_class(dpy, motion_recorder.id, sizeof(MOTION_RECORDER_IC), MOTION_RECORDER_IC);
 362
 363         xcb_atom_t net_atoms[] = {ewmh->_NET_SUPPORTED,
 364                                   ewmh->_NET_SUPPORTING_WM_CHECK,
 365                                   ewmh->_NET_DESKTOP_NAMES,
 366                                   ewmh->_NET_DESKTOP_VIEWPORT,
 367                                   ewmh->_NET_NUMBER_OF_DESKTOPS,
 368                                   ewmh->_NET_CURRENT_DESKTOP,
 369                                   ewmh->_NET_CLIENT_LIST,
 370                                   ewmh->_NET_ACTIVE_WINDOW,
 371                                   ewmh->_NET_CLOSE_WINDOW,
 372                                   ewmh->_NET_WM_STRUT_PARTIAL,
 373                                   ewmh->_NET_WM_DESKTOP,
 374                                   ewmh->_NET_WM_STATE,
 375                                   ewmh->_NET_WM_STATE_HIDDEN,
 376                                   ewmh->_NET_WM_STATE_FULLSCREEN,
 377                                   ewmh->_NET_WM_STATE_BELOW,
 378                                   ewmh->_NET_WM_STATE_ABOVE,
 379                                   ewmh->_NET_WM_STATE_STICKY,
 380                                   ewmh->_NET_WM_STATE_DEMANDS_ATTENTION,
 381                                   ewmh->_NET_WM_WINDOW_TYPE,
 382                                   ewmh->_NET_WM_WINDOW_TYPE_DOCK,
 383                                   ewmh->_NET_WM_WINDOW_TYPE_DESKTOP,
 384                                   ewmh->_NET_WM_WINDOW_TYPE_NOTIFICATION,
 385                                   ewmh->_NET_WM_WINDOW_TYPE_DIALOG,
 386                                   ewmh->_NET_WM_WINDOW_TYPE_UTILITY,
 387                                   ewmh->_NET_WM_WINDOW_TYPE_TOOLBAR};
 388
 389         xcb_ewmh_set_supported(ewmh, default_screen, LENGTH(net_atoms), net_atoms);
 390         ewmh_set_supporting(meta_window);
 391
 392 #define GETATOM(a) \
 393         get_atom(#a, &a);
 394         GETATOM(WM_STATE)
 395         GETATOM(WM_DELETE_WINDOW)
 396         GETATOM(WM_TAKE_FOCUS)
 397 #undef GETATOM
 398
 399         const xcb_query_extension_reply_t *qep = xcb_get_extension_data(dpy, &xcb_randr_id);
 400         if (qep->present && update_monitors()) {
 401                 randr = true;
 402                 randr_base = qep->first_event;
 403                 xcb_randr_select_input(dpy, root, XCB_RANDR_NOTIFY_MASK_SCREEN_CHANGE);
 404         } else {
 405                 randr = false;
 406                 warn("Couldn't retrieve monitors via RandR.\n");
 407                 bool xinerama_is_active = false;
 408
 409                 if (xcb_get_extension_data(dpy, &xcb_xinerama_id)->present) {
 410                         xcb_xinerama_is_active_reply_t *xia = xcb_xinerama_is_active_reply(dpy, xcb_xinerama_is_active(dpy), NULL);
 411                         if (xia != NULL) {
 412                                 xinerama_is_active = xia->state;
 413                                 free(xia);
 414                         }
 415                 }
 416
 417                 if (xinerama_is_active) {
 418                         xcb_xinerama_query_screens_reply_t *xsq = xcb_xinerama_query_screens_reply(dpy, xcb_xinerama_query_screens(dpy), NULL);
 419                         xcb_xinerama_screen_info_t *xsi = xcb_xinerama_query_screens_screen_info(xsq);
 420                         int n = xcb_xinerama_query_screens_screen_info_length(xsq);
 421                         for (int i = 0; i < n; i++) {
 422                                 xcb_xinerama_screen_info_t info = xsi[i];
 423                                 xcb_rectangle_t rect = (xcb_rectangle_t) {info.x_org, info.y_org, info.width, info.height};
 424                                 monitor_t *m = make_monitor(NULL, &rect, XCB_NONE);
 425                                 add_monitor(m);
 426                                 add_desktop(m, make_desktop(NULL, XCB_NONE));
 427                         }
 428                         free(xsq);
 429                 } else {
 430                         warn("Xinerama is inactive.\n");
 431                         xcb_rectangle_t rect = (xcb_rectangle_t) {0, 0, screen_width, screen_height};
 432                         monitor_t *m = make_monitor(NULL, &rect, XCB_NONE);
 433                         add_monitor(m);
 434                         add_desktop(m, make_desktop(NULL, XCB_NONE));
 435                 }
 436         }
 437
 438         ewmh_update_number_of_desktops();
 439         ewmh_update_desktop_names();
 440         ewmh_update_desktop_viewport();
 441         ewmh_update_current_desktop();
 442         xcb_get_input_focus_reply_t *ifo = xcb_get_input_focus_reply(dpy, xcb_get_input_focus(dpy), NULL);
 443         if (ifo != NULL && (ifo->focus == XCB_INPUT_FOCUS_POINTER_ROOT || ifo->focus == XCB_NONE)) {
 444                 clear_input_focus();
 445         }
 446         free(ifo);
 447 }
 448
 449 void register_events(void)
 450 {
 451         uint32_t values[] = {ROOT_EVENT_MASK};
 452         xcb_generic_error_t *e = xcb_request_check(dpy, xcb_change_window_attributes_checked(dpy, root, XCB_CW_EVENT_MASK, values));
 453         if (e != NULL) {
 454                 free(e);
 455                 xcb_ewmh_connection_wipe(ewmh);
 456                 free(ewmh);
 457                 xcb_disconnect(dpy);
 458                 err("Another window manager is already running.\n");
 459         }
 460 }
 461
 462 void cleanup(void)
 463 {
 464         mon = NULL;
 465
 466         while (mon_head != NULL) {
 467                 remove_monitor(mon_head);
 468         }
 469         while (rule_head != NULL) {
 470                 remove_rule(rule_head);
 471         }
 472         while (subscribe_head != NULL) {
 473                 remove_subscriber(subscribe_head);
 474         }
 475         while (pending_rule_head != NULL) {
 476                 remove_pending_rule(pending_rule_head);
 477         }
 478
 479         empty_history();
 480 }
 481
 482 bool check_connection (xcb_connection_t *dpy)
 483 {
 484         int xerr;
 485         if ((xerr = xcb_connection_has_error(dpy)) != 0) {
 486                 warn("The server closed the connection: ");
 487                 switch (xerr) {
 488                         case XCB_CONN_ERROR:
 489                                 warn("socket, pipe or stream error.\n");
 490                                 break;
 491                         case XCB_CONN_CLOSED_EXT_NOTSUPPORTED:
 492                                 warn("unsupported extension.\n");
 493                                 break;
 494                         case XCB_CONN_CLOSED_MEM_INSUFFICIENT:
 495                                 warn("not enough memory.\n");
 496                                 break;
 497                         case XCB_CONN_CLOSED_REQ_LEN_EXCEED:
 498                                 warn("request length exceeded.\n");
 499                                 break;
 500                         case XCB_CONN_CLOSED_PARSE_ERR:
 501                                 warn("can't parse display string.\n");
 502                                 break;
 503                         case XCB_CONN_CLOSED_INVALID_SCREEN:
 504                                 warn("invalid screen.\n");
 505                                 break;
 506                         case XCB_CONN_CLOSED_FDPASSING_FAILED:
 507                                 warn("failed to pass FD.\n");
 508                                 break;
 509                         default:
 510                                 warn("unknown error.\n");
 511                                 break;
 512                 }
 513                 return false;
 514         } else {
 515                 return true;
 516         }
 517 }
 518
 519 void sig_handler(int sig)
 520 {
 521         if (sig == SIGCHLD) {
 522                 signal(sig, sig_handler);
 523                 while (waitpid(-1, 0, WNOHANG) > 0)
 524                         ;
 525         } else if (sig == SIGINT || sig == SIGHUP || sig == SIGTERM) {
 526                 running = false;
 527         }
 528 }
 529
 530 /* Adapted from i3wm */
 531 uint32_t get_color_pixel(const char *color)
 532 {
 533         unsigned int red, green, blue;
 534         if (sscanf(color + 1, "%02x%02x%02x", &red, &green, &blue) == 3) {
 535                 /* We set the first 8 bits high to have 100% opacity in case of a 32 bit
 536                  * color depth visual. */
 537                 return (0xFF << 24) | (red << 16 | green << 8 | blue);
 538         } else {
 539                 return screen->black_pixel;
 540         }
 541 }