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 <string.h>
  28 #include <sys/select.h>
  29 #ifdef __OpenBSD__
  30 #include <sys/types.h>
  31 #endif
  32 #include <sys/wait.h>
  33 #include <sys/socket.h>
  34 #include <sys/un.h>
  35 #include <signal.h>
  36 #include <unistd.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 "subscribe.h"
  44 #include "events.h"
  45 #include "common.h"
  46 #include "window.h"
  47 #include "history.h"
  48 #include "stack.h"
  49 #include "ewmh.h"
  50 #include "rule.h"
  51 #include "bspwm.h"
  52
  53 int main(int argc, char *argv[])
  54 {
  55         fd_set descriptors;
  56         char socket_path[MAXLEN];
  57         config_path[0] = '\0';
  58         int sock_fd, cli_fd, dpy_fd, max_fd, n;
  59         struct sockaddr_un sock_address;
  60         char msg[BUFSIZ] = {0};
  61         xcb_generic_event_t *event;
  62         char opt;
  63
  64         while ((opt = getopt(argc, argv, "hvc:")) != (char)-1) {
  65                 switch (opt) {
  66                         case 'h':
  67                                 printf(WM_NAME " [-h|-v|-c CONFIG_PATH]\n");
  68                                 exit(EXIT_SUCCESS);
  69                                 break;
  70                         case 'v':
  71                                 printf("%s\n", VERSION);
  72                                 exit(EXIT_SUCCESS);
  73                                 break;
  74                         case 'c':
  75                                 snprintf(config_path, sizeof(config_path), "%s", optarg);
  76                                 break;
  77                 }
  78         }
  79
  80         char *sp = getenv(SOCKET_ENV_VAR);
  81         if (sp != NULL) {
  82                 snprintf(socket_path, sizeof(socket_path), "%s", sp);
  83         } else {
  84                 char *host = NULL;
  85                 int dn = 0, sn = 0;
  86                 if (xcb_parse_display(NULL, &host, &dn, &sn) != 0)
  87                         snprintf(socket_path, sizeof(socket_path), SOCKET_PATH_TPL, host, dn, sn);
  88                 free(host);
  89         }
  90
  91         sock_address.sun_family = AF_UNIX;
  92         snprintf(sock_address.sun_path, sizeof(sock_address.sun_path), "%s", socket_path);
  93
  94         sock_fd = socket(AF_UNIX, SOCK_STREAM, 0);
  95
  96         if (sock_fd == -1)
  97                 err("Couldn't create the socket.\n");
  98
  99         unlink(socket_path);
 100         if (bind(sock_fd, (struct sockaddr *) &sock_address, sizeof(sock_address)) == -1)
 101                 err("Couldn't bind a name to the socket.\n");
 102
 103         if (listen(sock_fd, SOMAXCONN) == -1)
 104                 err("Couldn't listen to the socket.\n");
 105
 106         if (config_path[0] == '\0') {
 107                 char *config_home = getenv(CONFIG_HOME_ENV);
 108                 if (config_home != NULL)
 109                         snprintf(config_path, sizeof(config_path), "%s/%s/%s", config_home, WM_NAME, CONFIG_NAME);
 110                 else
 111                         snprintf(config_path, sizeof(config_path), "%s/%s/%s/%s", getenv("HOME"), ".config", WM_NAME, CONFIG_NAME);
 112         }
 113
 114         dpy = xcb_connect(NULL, &default_screen);
 115
 116         if (!check_connection(dpy))
 117                 exit(EXIT_FAILURE);
 118
 119         load_settings();
 120         setup();
 121
 122         dpy_fd = xcb_get_file_descriptor(dpy);
 123
 124         signal(SIGINT, sig_handler);
 125         signal(SIGHUP, sig_handler);
 126         signal(SIGTERM, sig_handler);
 127         signal(SIGCHLD, sig_handler);
 128         signal(SIGPIPE, SIG_IGN);
 129         run_config();
 130         running = true;
 131
 132         while (running) {
 133
 134                 xcb_flush(dpy);
 135
 136                 FD_ZERO(&descriptors);
 137                 FD_SET(sock_fd, &descriptors);
 138                 FD_SET(dpy_fd, &descriptors);
 139                 max_fd = MAX(sock_fd, dpy_fd);
 140                 for (pending_rule_t *pr = pending_rule_head; pr != NULL; pr = pr->next) {
 141                         FD_SET(pr->fd, &descriptors);
 142                         if (pr->fd > max_fd)
 143                                 max_fd = pr->fd;
 144                 }
 145
 146                 if (select(max_fd + 1, &descriptors, NULL, NULL, NULL) > 0) {
 147
 148                         pending_rule_t *pr = pending_rule_head;
 149                         while (pr != NULL) {
 150                                 pending_rule_t *next = pr->next;
 151                                 if (FD_ISSET(pr->fd, &descriptors)) {
 152                                         manage_window(pr->win, pr->csq, pr->fd);
 153                                         remove_pending_rule(pr);
 154                                 }
 155                                 pr = next;
 156                         }
 157
 158                         if (FD_ISSET(sock_fd, &descriptors)) {
 159                                 cli_fd = accept(sock_fd, NULL, 0);
 160                                 if (cli_fd > 0 && (n = recv(cli_fd, msg, sizeof(msg), 0)) > 0) {
 161                                         msg[n] = '\0';
 162                                         FILE *rsp = fdopen(cli_fd, "w");
 163                                         if (rsp != NULL) {
 164                                                 int ret = handle_message(msg, n, rsp);
 165                                                 if (ret != MSG_SUBSCRIBE) {
 166                                                         if (ret != MSG_SUCCESS)
 167                                                                 fprintf(rsp, "%c", ret);
 168                                                         fflush(rsp);
 169                                                         fclose(rsp);
 170                                                 }
 171                                         } else {
 172                                                 warn("Can't open the client socket as file.\n");
 173                                                 close(cli_fd);
 174                                         }
 175                                 }
 176                         }
 177
 178                         if (FD_ISSET(dpy_fd, &descriptors)) {
 179                                 while ((event = xcb_poll_for_event(dpy)) != NULL) {
 180                                         handle_event(event);
 181                                         free(event);
 182                                 }
 183                         }
 184                 }
 185
 186                 if (!check_connection(dpy))
 187                         running = false;
 188         }
 189
 190         cleanup();
 191         close(sock_fd);
 192         unlink(socket_path);
 193         xcb_ewmh_connection_wipe(ewmh);
 194         xcb_destroy_window(dpy, meta_window);
 195         xcb_destroy_window(dpy, motion_recorder);
 196         free(ewmh);
 197         xcb_flush(dpy);
 198         xcb_disconnect(dpy);
 199         return exit_status;
 200 }
 201
 202 void init(void)
 203 {
 204         num_monitors = num_desktops = num_clients = 0;
 205         monitor_uid = desktop_uid = 0;
 206         mon = mon_head = mon_tail = pri_mon = NULL;
 207         history_head = history_tail = history_needle = NULL;
 208         rule_head = rule_tail = NULL;
 209         stack_head = stack_tail = NULL;
 210         subscribe_head = subscribe_tail = NULL;
 211         pending_rule_head = pending_rule_tail = NULL;
 212         last_motion_time = last_motion_x = last_motion_y = 0;
 213         visible = auto_raise = sticky_still = record_history = true;
 214         randr_base = 0;
 215         exit_status = 0;
 216 }
 217
 218 void setup(void)
 219 {
 220         init();
 221         ewmh_init();
 222         screen = xcb_setup_roots_iterator(xcb_get_setup(dpy)).data;
 223         if (screen == NULL)
 224                 err("Can't acquire the default screen.\n");
 225         root = screen->root;
 226         register_events();
 227
 228         screen_width = screen->width_in_pixels;
 229         screen_height = screen->height_in_pixels;
 230         root_depth = screen->root_depth;
 231
 232         meta_window = xcb_generate_id(dpy);
 233         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);
 234         xcb_icccm_set_wm_class(dpy, meta_window, sizeof(META_WINDOW_IC), META_WINDOW_IC);
 235
 236         motion_recorder = xcb_generate_id(dpy);
 237         uint32_t values[] = {XCB_EVENT_MASK_POINTER_MOTION};
 238         xcb_create_window(dpy, XCB_COPY_FROM_PARENT, motion_recorder, root, 0, 0, screen_width, screen_height, 0, XCB_WINDOW_CLASS_INPUT_ONLY, XCB_COPY_FROM_PARENT, XCB_CW_EVENT_MASK, values);
 239         xcb_icccm_set_wm_class(dpy, motion_recorder, sizeof(MOTION_RECORDER_IC), MOTION_RECORDER_IC);
 240
 241
 242         xcb_atom_t net_atoms[] = {ewmh->_NET_SUPPORTED,
 243                                   ewmh->_NET_SUPPORTING_WM_CHECK,
 244                                   ewmh->_NET_DESKTOP_NAMES,
 245                                   ewmh->_NET_NUMBER_OF_DESKTOPS,
 246                                   ewmh->_NET_CURRENT_DESKTOP,
 247                                   ewmh->_NET_CLIENT_LIST,
 248                                   ewmh->_NET_ACTIVE_WINDOW,
 249                                   ewmh->_NET_CLOSE_WINDOW,
 250                                   ewmh->_NET_WM_DESKTOP,
 251                                   ewmh->_NET_WM_STATE,
 252                                   ewmh->_NET_WM_STATE_FULLSCREEN,
 253                                   ewmh->_NET_WM_STATE_BELOW,
 254                                   ewmh->_NET_WM_STATE_ABOVE,
 255                                   ewmh->_NET_WM_STATE_STICKY,
 256                                   ewmh->_NET_WM_STATE_DEMANDS_ATTENTION,
 257                                   ewmh->_NET_WM_WINDOW_TYPE,
 258                                   ewmh->_NET_WM_WINDOW_TYPE_DOCK,
 259                                   ewmh->_NET_WM_WINDOW_TYPE_DESKTOP,
 260                                   ewmh->_NET_WM_WINDOW_TYPE_NOTIFICATION,
 261                                   ewmh->_NET_WM_WINDOW_TYPE_DIALOG,
 262                                   ewmh->_NET_WM_WINDOW_TYPE_UTILITY,
 263                                   ewmh->_NET_WM_WINDOW_TYPE_TOOLBAR};
 264
 265         xcb_ewmh_set_supported(ewmh, default_screen, LENGTH(net_atoms), net_atoms);
 266         ewmh_set_supporting(meta_window);
 267
 268 #define GETATOM(a) \
 269         get_atom(#a, &a);
 270         GETATOM(WM_DELETE_WINDOW)
 271         GETATOM(WM_TAKE_FOCUS)
 272 #undef GETATOM
 273
 274         const xcb_query_extension_reply_t *qep = xcb_get_extension_data(dpy, &xcb_randr_id);
 275         if (qep->present && update_monitors()) {
 276                 randr = true;
 277                 randr_base = qep->first_event;
 278                 xcb_randr_select_input(dpy, root, XCB_RANDR_NOTIFY_MASK_SCREEN_CHANGE);
 279         } else {
 280                 randr = false;
 281                 warn("Couldn't retrieve monitors via RandR.\n");
 282                 bool xinerama_is_active = false;
 283                 if (xcb_get_extension_data(dpy, &xcb_xinerama_id)->present) {
 284                         xcb_xinerama_is_active_reply_t *xia = xcb_xinerama_is_active_reply(dpy, xcb_xinerama_is_active(dpy), NULL);
 285                         if (xia != NULL) {
 286                                 xinerama_is_active = xia->state;
 287                                 free(xia);
 288                         }
 289                 }
 290
 291                 if (xinerama_is_active) {
 292                         xcb_xinerama_query_screens_reply_t *xsq = xcb_xinerama_query_screens_reply(dpy, xcb_xinerama_query_screens(dpy), NULL);
 293                         xcb_xinerama_screen_info_t *xsi = xcb_xinerama_query_screens_screen_info(xsq);
 294                         int n = xcb_xinerama_query_screens_screen_info_length(xsq);
 295                         for (int i = 0; i < n; i++) {
 296                                 xcb_xinerama_screen_info_t info = xsi[i];
 297                                 xcb_rectangle_t rect = (xcb_rectangle_t) {info.x_org, info.y_org, info.width, info.height};
 298                                 monitor_t *m = make_monitor(rect);
 299                                 add_monitor(m);
 300                                 add_desktop(m, make_desktop(NULL));
 301                         }
 302                         free(xsq);
 303                 } else {
 304                         warn("Xinerama is inactive.\n");
 305                         xcb_rectangle_t rect = (xcb_rectangle_t) {0, 0, screen_width, screen_height};
 306                         monitor_t *m = make_monitor(rect);
 307                         add_monitor(m);
 308                         add_desktop(m, make_desktop(NULL));
 309                 }
 310         }
 311
 312         ewmh_update_number_of_desktops();
 313         ewmh_update_desktop_names();
 314         ewmh_update_current_desktop();
 315         frozen_pointer = make_pointer_state();
 316         xcb_get_input_focus_reply_t *ifo = xcb_get_input_focus_reply(dpy, xcb_get_input_focus(dpy), NULL);
 317         if (ifo != NULL && (ifo->focus == XCB_INPUT_FOCUS_POINTER_ROOT || ifo->focus == XCB_NONE))
 318                 clear_input_focus();
 319         free(ifo);
 320 }
 321
 322 void register_events(void)
 323 {
 324         uint32_t values[] = {ROOT_EVENT_MASK};
 325         xcb_generic_error_t *e = xcb_request_check(dpy, xcb_change_window_attributes_checked(dpy, root, XCB_CW_EVENT_MASK, values));
 326         if (e != NULL) {
 327                 xcb_disconnect(dpy);
 328                 err("Another window manager is already running.\n");
 329         }
 330 }
 331
 332 void cleanup(void)
 333 {
 334         while (mon_head != NULL)
 335                 remove_monitor(mon_head);
 336         while (rule_head != NULL)
 337                 remove_rule(rule_head);
 338         while (stack_head != NULL)
 339                 remove_stack(stack_head);
 340         while (subscribe_head != NULL)
 341                 remove_subscriber(subscribe_head);
 342         while (pending_rule_head != NULL)
 343                 remove_pending_rule(pending_rule_head);
 344         empty_history();
 345         free(frozen_pointer);
 346 }
 347
 348 bool check_connection (xcb_connection_t *dpy)
 349 {
 350         int xerr;
 351         if ((xerr = xcb_connection_has_error(dpy)) != 0) {
 352                 warn("The server closed the connection: ");
 353                 switch (xerr) {
 354                         case XCB_CONN_ERROR:
 355                                 warn("socket, pipe or stream error.\n");
 356                                 break;
 357                         case XCB_CONN_CLOSED_EXT_NOTSUPPORTED:
 358                                 warn("unsupported extension.\n");
 359                                 break;
 360                         case XCB_CONN_CLOSED_MEM_INSUFFICIENT:
 361                                 warn("not enough memory.\n");
 362                                 break;
 363                         case XCB_CONN_CLOSED_REQ_LEN_EXCEED:
 364                                 warn("request length exceeded.\n");
 365                                 break;
 366                         case XCB_CONN_CLOSED_PARSE_ERR:
 367                                 warn("can't parse display string.\n");
 368                                 break;
 369                         case XCB_CONN_CLOSED_INVALID_SCREEN:
 370                                 warn("invalid screen.\n");
 371                                 break;
 372                         case XCB_CONN_CLOSED_FDPASSING_FAILED:
 373                                 warn("failed to pass FD.\n");
 374                                 break;
 375                         default:
 376                                 warn("unknown error.\n");
 377                                 break;
 378                 }
 379                 return false;
 380         } else {
 381                 return true;
 382         }
 383 }
 384
 385 void sig_handler(int sig)
 386 {
 387         if (sig == SIGCHLD) {
 388                 signal(sig, sig_handler);
 389                 while (waitpid(-1, 0, WNOHANG) > 0)
 390                         ;
 391         } else if (sig == SIGINT || sig == SIGHUP || sig == SIGTERM) {
 392                 running = false;
 393         }
 394 }