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 <fcntl.h>
  34 #include <signal.h>
  35 #include <unistd.h>
  36 #include <stdbool.h>
  37 #include <string.h>
  38 #include <xcb/xinerama.h>
  39 #include "types.h"
  40 #include "desktop.h"
  41 #include "monitor.h"
  42 #include "settings.h"
  43 #include "messages.h"
  44 #include "pointer.h"
  45 #include "events.h"
  46 #include "common.h"
  47 #include "window.h"
  48 #include "history.h"
  49 #include "ewmh.h"
  50 #include "rule.h"
  51 #include "restore.h"
  52 #include "query.h"
  53 #include "bspwm.h"
  54
  55 xcb_connection_t *dpy;
  56 int default_screen, screen_width, screen_height;
  57 uint32_t clients_count;
  58 xcb_screen_t *screen;
  59 xcb_window_t root;
  60 char config_path[MAXLEN];
  61
  62 monitor_t *mon;
  63 monitor_t *mon_head;
  64 monitor_t *mon_tail;
  65 monitor_t *pri_mon;
  66 history_t *history_head;
  67 history_t *history_tail;
  68 history_t *history_needle;
  69 rule_t *rule_head;
  70 rule_t *rule_tail;
  71 stacking_list_t *stack_head;
  72 stacking_list_t *stack_tail;
  73 subscriber_list_t *subscribe_head;
  74 subscriber_list_t *subscribe_tail;
  75 pending_rule_t *pending_rule_head;
  76 pending_rule_t *pending_rule_tail;
  77
  78 xcb_window_t meta_window;
  79 motion_recorder_t motion_recorder;
  80 xcb_atom_t WM_STATE;
  81 xcb_atom_t WM_TAKE_FOCUS;
  82 xcb_atom_t WM_DELETE_WINDOW;
  83 int exit_status;
  84
  85 bool auto_raise;
  86 bool sticky_still;
  87 bool hide_sticky;
  88 bool record_history;
  89 bool running;
  90 bool restart;
  91 bool randr;
  92
  93 int main(int argc, char *argv[])
  94 {
  95         fd_set descriptors;
  96         char socket_path[MAXLEN];
  97         char state_path[MAXLEN] = {0};
  98         int run_level = 0;
  99         config_path[0] = '\0';
 100         int sock_fd = -1, cli_fd, dpy_fd, max_fd, n;
 101         struct sockaddr_un sock_address;
 102         char msg[BUFSIZ] = {0};
 103         xcb_generic_event_t *event;
 104         char *end;
 105         int opt;
 106
 107         while ((opt = getopt(argc, argv, "hvc:s:o:")) != -1) {
 108                 switch (opt) {
 109                         case 'h':
 110                                 printf(WM_NAME " [-h|-v|-c CONFIG_PATH]\n");
 111                                 exit(EXIT_SUCCESS);
 112                                 break;
 113                         case 'v':
 114                                 printf("%s\n", VERSION);
 115                                 exit(EXIT_SUCCESS);
 116                                 break;
 117                         case 'c':
 118                                 snprintf(config_path, sizeof(config_path), "%s", optarg);
 119                                 break;
 120                         case 's':
 121                                 run_level |= 1;
 122                                 snprintf(state_path, sizeof(state_path), "%s", optarg);
 123                                 break;
 124                         case 'o':
 125                                 run_level |= 2;
 126                                 sock_fd = strtol(optarg, &end, 0);
 127                                 if (*end != '\0') {
 128                                         sock_fd = -1;
 129                                 }
 130                                 break;
 131                 }
 132         }
 133
 134         if (config_path[0] == '\0') {
 135                 char *config_home = getenv(CONFIG_HOME_ENV);
 136                 if (config_home != NULL) {
 137                         snprintf(config_path, sizeof(config_path), "%s/%s/%s", config_home, WM_NAME, CONFIG_NAME);
 138                 } else {
 139                         snprintf(config_path, sizeof(config_path), "%s/%s/%s/%s", getenv("HOME"), ".config", WM_NAME, CONFIG_NAME);
 140                 }
 141         }
 142
 143         dpy = xcb_connect(NULL, &default_screen);
 144
 145         if (!check_connection(dpy)) {
 146                 exit(EXIT_FAILURE);
 147         }
 148
 149         load_settings();
 150         setup();
 151
 152         if (state_path[0] != '\0') {
 153                 restore_state(state_path);
 154                 unlink(state_path);
 155         }
 156
 157         dpy_fd = xcb_get_file_descriptor(dpy);
 158
 159         if (sock_fd == -1) {
 160                 char *sp = getenv(SOCKET_ENV_VAR);
 161                 if (sp != NULL) {
 162                         snprintf(socket_path, sizeof(socket_path), "%s", sp);
 163                 } else {
 164                         char *host = NULL;
 165                         int dn = 0, sn = 0;
 166                         if (xcb_parse_display(NULL, &host, &dn, &sn) != 0) {
 167                                 snprintf(socket_path, sizeof(socket_path), SOCKET_PATH_TPL, host, dn, sn);
 168                         }
 169                         free(host);
 170                 }
 171
 172                 sock_address.sun_family = AF_UNIX;
 173                 if (snprintf(sock_address.sun_path, sizeof(sock_address.sun_path), "%s", socket_path) < 0) {
 174                         err("Couldn't write the socket path.\n");
 175                 }
 176
 177                 sock_fd = socket(AF_UNIX, SOCK_STREAM, 0);
 178
 179                 if (sock_fd == -1) {
 180                         err("Couldn't create the socket.\n");
 181                 }
 182
 183                 unlink(socket_path);
 184
 185                 if (bind(sock_fd, (struct sockaddr *) &sock_address, sizeof(sock_address)) == -1) {
 186                         err("Couldn't bind a name to the socket.\n");
 187                 }
 188
 189                 if (listen(sock_fd, SOMAXCONN) == -1) {
 190                         err("Couldn't listen to the socket.\n");
 191                 }
 192         }
 193
 194         fcntl(sock_fd, F_SETFD, FD_CLOEXEC | fcntl(sock_fd, F_GETFD));
 195
 196         signal(SIGINT, sig_handler);
 197         signal(SIGHUP, sig_handler);
 198         signal(SIGTERM, sig_handler);
 199         signal(SIGCHLD, sig_handler);
 200         signal(SIGPIPE, SIG_IGN);
 201         run_config(run_level);
 202         running = true;
 203
 204         while (running) {
 205
 206                 xcb_flush(dpy);
 207
 208                 FD_ZERO(&descriptors);
 209                 FD_SET(sock_fd, &descriptors);
 210                 FD_SET(dpy_fd, &descriptors);
 211                 max_fd = MAX(sock_fd, dpy_fd);
 212
 213                 for (pending_rule_t *pr = pending_rule_head; pr != NULL; pr = pr->next) {
 214                         FD_SET(pr->fd, &descriptors);
 215                         if (pr->fd > max_fd) {
 216                                 max_fd = pr->fd;
 217                         }
 218                 }
 219
 220                 if (select(max_fd + 1, &descriptors, NULL, NULL, NULL) > 0) {
 221
 222                         pending_rule_t *pr = pending_rule_head;
 223                         while (pr != NULL) {
 224                                 pending_rule_t *next = pr->next;
 225                                 if (FD_ISSET(pr->fd, &descriptors)) {
 226                                         if (manage_window(pr->win, pr->csq, pr->fd)) {
 227                                                 for (event_queue_t *eq = pr->event_head; eq != NULL; eq = eq->next) {
 228                                                         handle_event(&eq->event);
 229                                                 }
 230                                         }
 231                                         remove_pending_rule(pr);
 232                                 }
 233                                 pr = next;
 234                         }
 235
 236                         if (FD_ISSET(sock_fd, &descriptors)) {
 237                                 cli_fd = accept(sock_fd, NULL, 0);
 238                                 if (cli_fd > 0 && (n = recv(cli_fd, msg, sizeof(msg)-1, 0)) > 0) {
 239                                         msg[n] = '\0';
 240                                         FILE *rsp = fdopen(cli_fd, "w");
 241                                         if (rsp != NULL) {
 242                                                 handle_message(msg, n, rsp);
 243                                         } else {
 244                                                 warn("Can't open the client socket as file.\n");
 245                                                 close(cli_fd);
 246                                         }
 247                                 }
 248                         }
 249
 250                         if (FD_ISSET(dpy_fd, &descriptors)) {
 251                                 while ((event = xcb_poll_for_event(dpy)) != NULL) {
 252                                         handle_event(event);
 253                                         free(event);
 254                                 }
 255                         }
 256
 257                 }
 258
 259                 if (!check_connection(dpy)) {
 260                         running = false;
 261                 }
 262
 263                 prune_dead_subscribers();
 264         }
 265
 266         if (restart) {
 267                 char *host = NULL;
 268                 int dn = 0, sn = 0;
 269                 if (xcb_parse_display(NULL, &host, &dn, &sn) != 0) {
 270                         snprintf(state_path, sizeof(state_path), STATE_PATH_TPL, host, dn, sn);
 271                 }
 272                 free(host);
 273                 FILE *f = fopen(state_path, "w");
 274                 query_state(f);
 275                 fclose(f);
 276         }
 277
 278         cleanup();
 279         ungrab_buttons();
 280         xcb_ewmh_connection_wipe(ewmh);
 281         xcb_destroy_window(dpy, meta_window);
 282         xcb_destroy_window(dpy, motion_recorder.id);
 283         free(ewmh);
 284         xcb_flush(dpy);
 285         xcb_disconnect(dpy);
 286
 287         if (restart) {
 288                 fcntl(sock_fd, F_SETFD, ~FD_CLOEXEC & fcntl(sock_fd, F_GETFD));
 289
 290                 int rargc;
 291                 for (rargc = 0; rargc < argc; rargc++) {
 292                         if (streq("-s", argv[rargc])) {
 293                                 break;
 294                         }
 295                 }
 296
 297                 int len = rargc + 5;
 298                 char **rargv = malloc(len * sizeof(char *));
 299
 300                 for (int i = 0; i < rargc; i++) {
 301                         rargv[i] = argv[i];
 302                 }
 303
 304                 char sock_fd_arg[SMALEN];
 305                 snprintf(sock_fd_arg, sizeof(sock_fd_arg), "%i", sock_fd);
 306
 307                 rargv[rargc] = "-s";
 308                 rargv[rargc + 1] = state_path;
 309                 rargv[rargc + 2] = "-o";
 310                 rargv[rargc + 3] = sock_fd_arg;
 311                 rargv[rargc + 4] = 0;
 312
 313                 exit_status = execvp(*rargv, rargv);
 314                 free(rargv);
 315         }
 316
 317         close(sock_fd);
 318         unlink(socket_path);
 319
 320         return exit_status;
 321 }
 322
 323 void init(void)
 324 {
 325         clients_count = 0;
 326         mon = mon_head = mon_tail = pri_mon = NULL;
 327         history_head = history_tail = history_needle = NULL;
 328         rule_head = rule_tail = NULL;
 329         stack_head = stack_tail = NULL;
 330         subscribe_head = subscribe_tail = NULL;
 331         pending_rule_head = pending_rule_tail = NULL;
 332         auto_raise = sticky_still = hide_sticky = record_history = true;
 333         randr_base = 0;
 334         exit_status = 0;
 335         restart = false;
 336 }
 337
 338 void setup(void)
 339 {
 340         init();
 341         ewmh_init();
 342         pointer_init();
 343
 344         screen = xcb_setup_roots_iterator(xcb_get_setup(dpy)).data;
 345
 346         if (screen == NULL) {
 347                 err("Can't acquire the default screen.\n");
 348         }
 349
 350         root = screen->root;
 351         register_events();
 352
 353         screen_width = screen->width_in_pixels;
 354         screen_height = screen->height_in_pixels;
 355
 356         meta_window = xcb_generate_id(dpy);
 357         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);
 358         xcb_icccm_set_wm_class(dpy, meta_window, sizeof(META_WINDOW_IC), META_WINDOW_IC);
 359
 360         motion_recorder.id = xcb_generate_id(dpy);
 361         motion_recorder.sequence = 0;
 362         motion_recorder.enabled = false;
 363         uint32_t values[] = {XCB_EVENT_MASK_STRUCTURE_NOTIFY | XCB_EVENT_MASK_POINTER_MOTION};
 364         xcb_create_window(dpy, XCB_COPY_FROM_PARENT, motion_recorder.id, root, 0, 0, 1, 1, 0,
 365                           XCB_WINDOW_CLASS_INPUT_ONLY, XCB_COPY_FROM_PARENT, XCB_CW_EVENT_MASK, values);
 366         xcb_icccm_set_wm_class(dpy, motion_recorder.id, sizeof(MOTION_RECORDER_IC), MOTION_RECORDER_IC);
 367
 368         xcb_atom_t net_atoms[] = {ewmh->_NET_SUPPORTED,
 369                                   ewmh->_NET_SUPPORTING_WM_CHECK,
 370                                   ewmh->_NET_DESKTOP_NAMES,
 371                                   ewmh->_NET_DESKTOP_VIEWPORT,
 372                                   ewmh->_NET_NUMBER_OF_DESKTOPS,
 373                                   ewmh->_NET_CURRENT_DESKTOP,
 374                                   ewmh->_NET_CLIENT_LIST,
 375                                   ewmh->_NET_ACTIVE_WINDOW,
 376                                   ewmh->_NET_CLOSE_WINDOW,
 377                                   ewmh->_NET_WM_STRUT_PARTIAL,
 378                                   ewmh->_NET_WM_DESKTOP,
 379                                   ewmh->_NET_WM_STATE,
 380                                   ewmh->_NET_WM_STATE_HIDDEN,
 381                                   ewmh->_NET_WM_STATE_FULLSCREEN,
 382                                   ewmh->_NET_WM_STATE_BELOW,
 383                                   ewmh->_NET_WM_STATE_ABOVE,
 384                                   ewmh->_NET_WM_STATE_STICKY,
 385                                   ewmh->_NET_WM_STATE_DEMANDS_ATTENTION,
 386                                   ewmh->_NET_WM_WINDOW_TYPE,
 387                                   ewmh->_NET_WM_WINDOW_TYPE_DOCK,
 388                                   ewmh->_NET_WM_WINDOW_TYPE_DESKTOP,
 389                                   ewmh->_NET_WM_WINDOW_TYPE_NOTIFICATION,
 390                                   ewmh->_NET_WM_WINDOW_TYPE_DIALOG,
 391                                   ewmh->_NET_WM_WINDOW_TYPE_UTILITY,
 392                                   ewmh->_NET_WM_WINDOW_TYPE_TOOLBAR};
 393
 394         xcb_ewmh_set_supported(ewmh, default_screen, LENGTH(net_atoms), net_atoms);
 395         ewmh_set_supporting(meta_window);
 396
 397 #define GETATOM(a) \
 398         get_atom(#a, &a);
 399         GETATOM(WM_STATE)
 400         GETATOM(WM_DELETE_WINDOW)
 401         GETATOM(WM_TAKE_FOCUS)
 402 #undef GETATOM
 403
 404         const xcb_query_extension_reply_t *qep = xcb_get_extension_data(dpy, &xcb_randr_id);
 405         if (qep->present && update_monitors()) {
 406                 randr = true;
 407                 randr_base = qep->first_event;
 408                 xcb_randr_select_input(dpy, root, XCB_RANDR_NOTIFY_MASK_SCREEN_CHANGE);
 409         } else {
 410                 randr = false;
 411                 warn("Couldn't retrieve monitors via RandR.\n");
 412                 bool xinerama_is_active = false;
 413
 414                 if (xcb_get_extension_data(dpy, &xcb_xinerama_id)->present) {
 415                         xcb_xinerama_is_active_reply_t *xia = xcb_xinerama_is_active_reply(dpy, xcb_xinerama_is_active(dpy), NULL);
 416                         if (xia != NULL) {
 417                                 xinerama_is_active = xia->state;
 418                                 free(xia);
 419                         }
 420                 }
 421
 422                 if (xinerama_is_active) {
 423                         xcb_xinerama_query_screens_reply_t *xsq = xcb_xinerama_query_screens_reply(dpy, xcb_xinerama_query_screens(dpy), NULL);
 424                         xcb_xinerama_screen_info_t *xsi = xcb_xinerama_query_screens_screen_info(xsq);
 425                         int n = xcb_xinerama_query_screens_screen_info_length(xsq);
 426                         for (int i = 0; i < n; i++) {
 427                                 xcb_xinerama_screen_info_t info = xsi[i];
 428                                 xcb_rectangle_t rect = (xcb_rectangle_t) {info.x_org, info.y_org, info.width, info.height};
 429                                 monitor_t *m = make_monitor(NULL, &rect, XCB_NONE);
 430                                 add_monitor(m);
 431                                 add_desktop(m, make_desktop(NULL, XCB_NONE));
 432                         }
 433                         free(xsq);
 434                 } else {
 435                         warn("Xinerama is inactive.\n");
 436                         xcb_rectangle_t rect = (xcb_rectangle_t) {0, 0, screen_width, screen_height};
 437                         monitor_t *m = make_monitor(NULL, &rect, XCB_NONE);
 438                         add_monitor(m);
 439                         add_desktop(m, make_desktop(NULL, XCB_NONE));
 440                 }
 441         }
 442
 443         ewmh_update_number_of_desktops();
 444         ewmh_update_desktop_names();
 445         ewmh_update_desktop_viewport();
 446         ewmh_update_current_desktop();
 447         xcb_get_input_focus_reply_t *ifo = xcb_get_input_focus_reply(dpy, xcb_get_input_focus(dpy), NULL);
 448         if (ifo != NULL && (ifo->focus == XCB_INPUT_FOCUS_POINTER_ROOT || ifo->focus == XCB_NONE)) {
 449                 clear_input_focus();
 450         }
 451         free(ifo);
 452 }
 453
 454 void register_events(void)
 455 {
 456         uint32_t values[] = {ROOT_EVENT_MASK};
 457         xcb_generic_error_t *e = xcb_request_check(dpy, xcb_change_window_attributes_checked(dpy, root, XCB_CW_EVENT_MASK, values));
 458         if (e != NULL) {
 459                 free(e);
 460                 xcb_ewmh_connection_wipe(ewmh);
 461                 free(ewmh);
 462                 xcb_disconnect(dpy);
 463                 err("Another window manager is already running.\n");
 464         }
 465 }
 466
 467 void cleanup(void)
 468 {
 469         mon = NULL;
 470
 471         while (mon_head != NULL) {
 472                 remove_monitor(mon_head);
 473         }
 474         while (rule_head != NULL) {
 475                 remove_rule(rule_head);
 476         }
 477         while (subscribe_head != NULL) {
 478                 remove_subscriber(subscribe_head);
 479         }
 480         while (pending_rule_head != NULL) {
 481                 remove_pending_rule(pending_rule_head);
 482         }
 483
 484         empty_history();
 485 }
 486
 487 bool check_connection (xcb_connection_t *dpy)
 488 {
 489         int xerr;
 490         if ((xerr = xcb_connection_has_error(dpy)) != 0) {
 491                 warn("The server closed the connection: ");
 492                 switch (xerr) {
 493                         case XCB_CONN_ERROR:
 494                                 warn("socket, pipe or stream error.\n");
 495                                 break;
 496                         case XCB_CONN_CLOSED_EXT_NOTSUPPORTED:
 497                                 warn("unsupported extension.\n");
 498                                 break;
 499                         case XCB_CONN_CLOSED_MEM_INSUFFICIENT:
 500                                 warn("not enough memory.\n");
 501                                 break;
 502                         case XCB_CONN_CLOSED_REQ_LEN_EXCEED:
 503                                 warn("request length exceeded.\n");
 504                                 break;
 505                         case XCB_CONN_CLOSED_PARSE_ERR:
 506                                 warn("can't parse display string.\n");
 507                                 break;
 508                         case XCB_CONN_CLOSED_INVALID_SCREEN:
 509                                 warn("invalid screen.\n");
 510                                 break;
 511                         case XCB_CONN_CLOSED_FDPASSING_FAILED:
 512                                 warn("failed to pass FD.\n");
 513                                 break;
 514                         default:
 515                                 warn("unknown error.\n");
 516                                 break;
 517                 }
 518                 return false;
 519         } else {
 520                 return true;
 521         }
 522 }
 523
 524 void sig_handler(int sig)
 525 {
 526         if (sig == SIGCHLD) {
 527                 signal(sig, sig_handler);
 528                 while (waitpid(-1, 0, WNOHANG) > 0)
 529                         ;
 530         } else if (sig == SIGINT || sig == SIGHUP || sig == SIGTERM) {
 531                 running = false;
 532         }
 533 }
 534
 535 /* Adapted from i3wm */
 536 uint32_t get_color_pixel(const char *color)
 537 {
 538         unsigned int red, green, blue;
 539         if (sscanf(color + 1, "%02x%02x%02x", &red, &green, &blue) == 3) {
 540                 /* We set the first 8 bits high to have 100% opacity in case of a 32 bit
 541                  * color depth visual. */
 542                 return (0xFF << 24) | (red << 16 | green << 8 | blue);
 543         } else {
 544                 return screen->black_pixel;
 545         }
 546 }