bspwm.c

   1 #include <stdlib.h>
   2 #include <stdio.h>
   3 #include <string.h>
   4 #include <unistd.h>
   5 #include <signal.h>
   6 #include <fcntl.h>
   7 #include <sys/socket.h>
   8 #include <sys/un.h>
   9 #include <sys/select.h>
  10 #include <sys/stat.h>
  11 #include <sys/wait.h>
  12 #include <xcb/xcb.h>
  13 #include <xcb/xcb_event.h>
  14 #include <xcb/xcb_ewmh.h>
  15 #include <xcb/xinerama.h>
  16 #include "types.h"
  17 #include "settings.h"
  18 #include "messages.h"
  19 #include "rules.h"
  20 #include "events.h"
  21 #include "common.h"
  22 #include "helpers.h"
  23 #include "window.h"
  24 #include "bspwm.h"
  25 #include "tree.h"
  26 #include "ewmh.h"
  27
  28 void quit(void)
  29 {
  30     running = false;
  31 }
  32
  33 void cleanup(void)
  34 {
  35     while (mon_head != NULL)
  36         remove_monitor(mon_head);
  37     while (rule_head != NULL)
  38         remove_rule(rule_head);
  39     free(frozen_pointer);
  40 }
  41
  42 void register_events(void)
  43 {
  44     uint32_t values[] = {ROOT_EVENT_MASK};
  45     xcb_generic_error_t *e = xcb_request_check(dpy, xcb_change_window_attributes_checked(dpy, screen->root, XCB_CW_EVENT_MASK, values));
  46     if (e != NULL) {
  47         xcb_disconnect(dpy);
  48         err("another wm is already running\n");
  49     }
  50 }
  51
  52 void handle_buttons(bool grab)
  53 {
  54     uint8_t buts[] = {XCB_BUTTON_INDEX_1, XCB_BUTTON_INDEX_2, XCB_BUTTON_INDEX_3};
  55     uint16_t mods[] = {button_modifier, button_modifier | numlock_modifier, button_modifier | capslock_modifier, button_modifier | numlock_modifier | capslock_modifier};
  56
  57     for (unsigned int i = 0; i < LENGTH(buts); i++) {
  58         uint8_t b = buts[i];
  59         for (unsigned int j = 0; j < LENGTH(mods); j++) {
  60             uint16_t m = mods[j];
  61             if (grab)
  62                 xcb_grab_button(dpy, false, screen->root, XCB_EVENT_MASK_BUTTON_PRESS, XCB_GRAB_MODE_ASYNC, XCB_GRAB_MODE_ASYNC, XCB_NONE, XCB_NONE, b, m);
  63             else
  64                 xcb_ungrab_button(dpy, b, screen->root, m);
  65         }
  66     }
  67 }
  68
  69 void grab_buttons(void)
  70 {
  71     handle_buttons(true);
  72 }
  73
  74 void ungrab_buttons(void)
  75 {
  76     handle_buttons(false);
  77 }
  78
  79 void setup(void)
  80 {
  81     ewmh_init();
  82     screen = xcb_setup_roots_iterator(xcb_get_setup(dpy)).data;
  83     if (!screen)
  84         err("can't acquire screen\n");
  85     register_events();
  86
  87     screen_width = screen->width_in_pixels;
  88     screen_height = screen->height_in_pixels;
  89     root_depth = screen->root_depth;
  90
  91     xcb_atom_t net_atoms[] = {ewmh->_NET_SUPPORTED,
  92                               ewmh->_NET_DESKTOP_NAMES,
  93                               ewmh->_NET_NUMBER_OF_DESKTOPS,
  94                               ewmh->_NET_CURRENT_DESKTOP,
  95                               ewmh->_NET_CLIENT_LIST,
  96                               ewmh->_NET_ACTIVE_WINDOW,
  97                               ewmh->_NET_WM_DESKTOP,
  98                               ewmh->_NET_WM_STATE,
  99                               ewmh->_NET_WM_STATE_FULLSCREEN,
 100                               ewmh->_NET_WM_WINDOW_TYPE,
 101                               ewmh->_NET_WM_WINDOW_TYPE_DOCK,
 102                               ewmh->_NET_WM_WINDOW_TYPE_NOTIFICATION,
 103                               ewmh->_NET_WM_WINDOW_TYPE_DIALOG,
 104                               ewmh->_NET_WM_WINDOW_TYPE_UTILITY,
 105                               ewmh->_NET_WM_WINDOW_TYPE_TOOLBAR};
 106
 107     xcb_ewmh_set_supported(ewmh, default_screen, LENGTH(net_atoms), net_atoms);
 108
 109     monitor_uid = desktop_uid = client_uid = rule_uid = 0;
 110     mon = last_mon = mon_head = mon_tail = NULL;
 111
 112     bool xinerama_is_active = false;
 113
 114     if (xcb_get_extension_data(dpy, &xcb_xinerama_id)->present) {
 115         xcb_xinerama_is_active_reply_t *xia = xcb_xinerama_is_active_reply(dpy, xcb_xinerama_is_active(dpy), NULL);
 116         if (xia != NULL) {
 117             xinerama_is_active = xia->state;
 118             free(xia);
 119         }
 120     }
 121
 122     if (xinerama_is_active) {
 123         xcb_xinerama_query_screens_reply_t *xsq = xcb_xinerama_query_screens_reply(dpy, xcb_xinerama_query_screens(dpy), NULL);
 124         xcb_xinerama_screen_info_t *xsi = xcb_xinerama_query_screens_screen_info(xsq);
 125         int n = xcb_xinerama_query_screens_screen_info_length(xsq);
 126         PRINTF("number of monitors: %d\n", n);
 127         for (int i = 0; i < n; i++) {
 128             xcb_xinerama_screen_info_t info = xsi[i];
 129             xcb_rectangle_t rect = (xcb_rectangle_t) {info.x_org, info.y_org, info.width, info.height};
 130             add_monitor(&rect);
 131         }
 132         free(xsq);
 133     } else {
 134         warn("Xinerama is inactive");
 135         xcb_rectangle_t rect = (xcb_rectangle_t) {0, 0, screen_width, screen_height};
 136         add_monitor(&rect);
 137     }
 138
 139     for (monitor_t *m = mon_head; m != NULL; m = m->next)
 140         add_desktop(m, NULL);
 141
 142     ewmh_update_number_of_desktops();
 143     ewmh_update_desktop_names();
 144     ewmh_update_current_desktop();
 145     rule_head = rule_tail = NULL;
 146     frozen_pointer = make_pointer_state();
 147     get_pointer_position(&pointer_position);
 148     last_entered = XCB_NONE;
 149     split_mode = MODE_AUTOMATIC;
 150     visible = true;
 151     exit_status = 0;
 152 }
 153
 154 int main(int argc, char *argv[])
 155 {
 156     fd_set descriptors;
 157     char socket_path[MAXLEN];
 158     char *fifo_path = NULL;
 159     int sock_fd, ret_fd, dpy_fd, sel, n;
 160     struct sockaddr_un sock_address;
 161     size_t rsplen = 0;
 162     char msg[BUFSIZ] = {0};
 163     char rsp[BUFSIZ] = {0};
 164     xcb_generic_event_t *event;
 165     char opt;
 166
 167     while ((opt = getopt(argc, argv, "vs:")) != -1) {
 168         switch (opt) {
 169             case 'v':
 170                 printf("%s\n", VERSION);
 171                 exit(EXIT_SUCCESS);
 172                 break;
 173             case 's':
 174                 fifo_path = optarg;
 175                 break;
 176         }
 177     }
 178
 179     running = true;
 180     dpy = xcb_connect(NULL, &default_screen);
 181
 182     if (xcb_connection_has_error(dpy))
 183         err("can't open display\n");
 184
 185     setup();
 186
 187     dpy_fd = xcb_get_file_descriptor(dpy);
 188
 189     char *sp = getenv(SOCKET_ENV_VAR);
 190     strncpy(socket_path, (sp == NULL ? DEFAULT_SOCKET_PATH : sp), sizeof(socket_path));
 191
 192     sock_address.sun_family = AF_UNIX;
 193     strncpy(sock_address.sun_path, socket_path, sizeof(sock_address.sun_path));
 194     unlink(socket_path);
 195
 196     sock_fd = socket(AF_UNIX, SOCK_STREAM, 0);
 197
 198     if (sock_fd == -1)
 199         err("couldn't create socket\n");
 200
 201     bind(sock_fd, (struct sockaddr *) &sock_address, sizeof(sock_address));
 202     listen(sock_fd, SOMAXCONN);
 203     sel = MAX(sock_fd, dpy_fd) + 1;
 204
 205     if (fifo_path != NULL) {
 206         int fifo_fd = open(fifo_path, O_RDWR | O_NONBLOCK);
 207         if (fifo_fd != -1)
 208             status_fifo = fdopen(fifo_fd, "w");
 209         else
 210             warn("couldn't open status fifo\n");
 211     }
 212
 213     load_settings();
 214     run_autostart();
 215     grab_buttons();
 216     ewmh_update_wm_name();
 217
 218     while (running) {
 219
 220         xcb_flush(dpy);
 221
 222         FD_ZERO(&descriptors);
 223         FD_SET(sock_fd, &descriptors);
 224         FD_SET(dpy_fd, &descriptors);
 225
 226         if (select(sel, &descriptors, NULL, NULL, NULL)) {
 227
 228             if (FD_ISSET(sock_fd, &descriptors)) {
 229                 ret_fd = accept(sock_fd, NULL, 0);
 230                 if (ret_fd > 0 && (n = recv(ret_fd, msg, sizeof(msg), 0)) > 0) {
 231                     msg[n] = '\0';
 232                     process_message(msg, rsp);
 233                     rsplen = strlen(rsp);
 234                     if (rsp[rsplen - 1] == '\n')
 235                         rsp[--rsplen] = '\0';
 236                     send(ret_fd, rsp, rsplen, 0);
 237                     close(ret_fd);
 238                     rsp[0] = '\0';
 239                 }
 240             }
 241
 242             if (FD_ISSET(dpy_fd, &descriptors)) {
 243                 while ((event = xcb_poll_for_event(dpy)) != NULL) {
 244                     handle_event(event);
 245                     free(event);
 246                 }
 247             }
 248
 249         }
 250
 251         if (xcb_connection_has_error(dpy)) {
 252             err("connection has errors\n");
 253         }
 254     }
 255
 256     cleanup();
 257     close(sock_fd);
 258     if (status_fifo != NULL)
 259         fclose(status_fifo);
 260     xcb_ewmh_connection_wipe(ewmh);
 261     free(ewmh);
 262     xcb_flush(dpy);
 263     xcb_disconnect(dpy);
 264     return exit_status;
 265 }