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