Pileus Git - wmpus/blob - sys-x11.c

   1 /*
   2  * Copyright (c) 2011, Andy Spencer <andy753421@gmail.com>
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  */
  15
  16 #define _GNU_SOURCE
  17 #include <stdio.h>
  18 #include <stdlib.h>
  19 #include <search.h>
  20
  21 #include <X11/Xlib.h>
  22 #include <X11/Xproto.h>
  23 #include <X11/Xatom.h>
  24 #include <X11/keysym.h>
  25 #include <X11/extensions/Xinerama.h>
  26
  27 #include "util.h"
  28 #include "conf.h"
  29 #include "sys.h"
  30 #include "wm.h"
  31
  32 /* Configuration */
  33 static int BORDER     = 2;
  34 static int NO_CAPTURE = 0;
  35
  36 /* Internal structures */
  37 struct win_sys {
  38         Window   xid;
  39         Display *dpy;
  40         struct {
  41                 int left, right, top, bottom;
  42         } strut;
  43         state_t  state;
  44 };
  45
  46 typedef struct {
  47         Key_t key;
  48         int   sym;
  49 } keymap_t;
  50
  51 typedef enum {
  52         wm_proto, wm_focus, net_strut, natoms
  53 } atom_t;
  54
  55 typedef enum {
  56         clr_focus, clr_unfocus, clr_urgent, ncolors
  57 } color_t;
  58
  59 /* Global data */
  60 static int   running;
  61 static void *cache;
  62 static Atom atoms[natoms];
  63 static int (*xerrorxlib)(Display *, XErrorEvent *);
  64 static unsigned long colors[ncolors];
  65 static list_t *screens;
  66
  67 /* Conversion functions */
  68 static keymap_t key2sym[] = {
  69         {key_left    , XK_Left },
  70         {key_right   , XK_Right},
  71         {key_up      , XK_Up   },
  72         {key_down    , XK_Down },
  73         {key_home    , XK_Home },
  74         {key_end     , XK_End  },
  75         {key_pageup  , XK_Prior},
  76         {key_pagedown, XK_Next },
  77         {key_f1      , XK_F1   },
  78         {key_f2      , XK_F2   },
  79         {key_f3      , XK_F3   },
  80         {key_f4      , XK_F4   },
  81         {key_f5      , XK_F5   },
  82         {key_f6      , XK_F6   },
  83         {key_f7      , XK_F7   },
  84         {key_f8      , XK_F8   },
  85         {key_f9      , XK_F9   },
  86         {key_f10     , XK_F10  },
  87         {key_f11     , XK_F11  },
  88         {key_f12     , XK_F12  },
  89 };
  90
  91 /* - Modifiers */
  92 static mod_t x2mod(unsigned int state, int up)
  93 {
  94         return (mod_t){
  95                .alt   = !!(state & Mod1Mask   ),
  96                .ctrl  = !!(state & ControlMask),
  97                .shift = !!(state & ShiftMask  ),
  98                .win   = !!(state & Mod4Mask   ),
  99                .up    = up,
 100         };
 101 }
 102
 103 static unsigned int mod2x(mod_t mod)
 104 {
 105         return (mod.alt   ? Mod1Mask    : 0)
 106              | (mod.ctrl  ? ControlMask : 0)
 107              | (mod.shift ? ShiftMask   : 0)
 108              | (mod.win   ? Mod4Mask    : 0);
 109 }
 110
 111 /* - Keycodes */
 112 static Key_t x2key(KeySym sym)
 113 {
 114         keymap_t *km = map_getr(key2sym,sym);
 115         return km ? km->key : sym;
 116 }
 117
 118 static KeySym key2x(Key_t key)
 119 {
 120         keymap_t *km = map_get(key2sym,key);
 121         return km ? km->sym : key;
 122 }
 123
 124 static Key_t x2btn(int btn)
 125 {
 126         return btn + key_mouse0;
 127 }
 128
 129 static int btn2x(Key_t key)
 130 {
 131         return key - key_mouse0;
 132 }
 133
 134 /* - Pointers */
 135 static ptr_t x2ptr(XEvent *_ev)
 136 {
 137         XKeyEvent *ev = &_ev->xkey;
 138         return (ptr_t){ev->x, ev->y, ev->x_root, ev->y_root};
 139 }
 140
 141 static Window getfocus(win_t *root, XEvent *event)
 142 {
 143         int revert;
 144         Window focus = PointerRoot;
 145         if (event->type == KeyPress || event->type == KeyRelease)
 146                 XGetInputFocus(root->sys->dpy, &focus, &revert);
 147         if (focus == PointerRoot)
 148                 focus = event->xkey.subwindow;
 149         if (focus == None)
 150                 focus = event->xkey.window;
 151         return focus;
 152 }
 153
 154 /* Strut functions
 155  *   Struts are spaces at the edges of the screen that are used by
 156  *   toolbars and statusbars such as dzen. */
 157 static int strut_copy(win_t *to, win_t *from, int scale)
 158 {
 159         int left   = from->sys->strut.left;
 160         int right  = from->sys->strut.right;
 161         int top    = from->sys->strut.top;
 162         int bottom = from->sys->strut.bottom;
 163         if (left == 0 && right == 0 && top == 0 && bottom == 0)
 164                 return 0;
 165         to->x += scale*(left      );
 166         to->y += scale*(top       );
 167         to->w -= scale*(left+right);
 168         to->h -= scale*(top+bottom);
 169         return 1;
 170 }
 171
 172 static int strut_add(win_t *root, win_t *win)
 173 {
 174         /* Get X11 strut data */
 175         Atom ret_type;
 176         int ret_size;
 177         unsigned long ret_items, bytes_left;
 178         unsigned char *xdata;
 179         int status = XGetWindowProperty(win->sys->dpy, win->sys->xid,
 180                         atoms[net_strut], 0L, 4L, False, XA_CARDINAL,
 181                         &ret_type, &ret_size, &ret_items, &bytes_left, &xdata);
 182         if (status != Success || ret_size != 32 || ret_items != 4)
 183                 return 0;
 184
 185         win->sys->strut.left   = ((int*)xdata)[0];
 186         win->sys->strut.right  = ((int*)xdata)[1];
 187         win->sys->strut.top    = ((int*)xdata)[2];
 188         win->sys->strut.bottom = ((int*)xdata)[3];
 189         for (list_t *cur = screens; cur; cur = cur->next)
 190                 strut_copy(cur->data, win, 1);
 191         return strut_copy(root, win, 1);
 192 }
 193
 194 static int strut_del(win_t *root, win_t *win)
 195 {
 196         for (list_t *cur = screens; cur; cur = cur->next)
 197                 strut_copy(cur->data, win, -1);
 198         return strut_copy(root, win, -1);
 199 }
 200
 201 /* Window functions */
 202 static win_t *win_new(Display *dpy, Window xid)
 203 {
 204         XWindowAttributes attr;
 205         if (XGetWindowAttributes(dpy, xid, &attr))
 206                 if (attr.override_redirect)
 207                         return NULL;
 208         win_t *win    = new0(win_t);
 209         win->x        = attr.x;
 210         win->y        = attr.y;
 211         win->w        = attr.width;
 212         win->h        = attr.height;
 213         win->sys      = new0(win_sys_t);
 214         win->sys->dpy = dpy;
 215         win->sys->xid = xid;
 216         printf("win_new: %p = %p, %d (%d,%d %dx%d)\n",
 217                         win, dpy, (int)xid,
 218                         win->x, win->y, win->w, win->h);
 219         return win;
 220 }
 221
 222 static int win_cmp(const void *_a, const void *_b)
 223 {
 224         const win_t *a = _a, *b = _b;
 225         if (a->sys->dpy < b->sys->dpy) return -1;
 226         if (a->sys->dpy > b->sys->dpy) return  1;
 227         if (a->sys->xid < b->sys->xid) return -1;
 228         if (a->sys->xid > b->sys->xid) return  1;
 229         return 0;
 230 }
 231
 232 static win_t *win_find(Display *dpy, Window xid, int create)
 233 {
 234         if (!dpy || !xid)
 235                 return NULL;
 236         //printf("win_find: %p, %d\n", dpy, (int)xid);
 237         win_sys_t sys = {.dpy=dpy, .xid=xid};
 238         win_t     tmp = {.sys=&sys};
 239         win_t **old = NULL, *new = NULL;
 240         if ((old = tfind(&tmp, &cache, win_cmp)))
 241                 return *old;
 242         if (create && (new = win_new(dpy,xid)))
 243                 tsearch(new, &cache, win_cmp);
 244         return new;
 245 }
 246
 247 static void win_free(win_t *win)
 248 {
 249         free(win->sys);
 250         free(win);
 251 }
 252
 253 static void win_remove(win_t *win)
 254 {
 255         tdelete(win, &cache, win_cmp);
 256         win_free(win);
 257 }
 258
 259 static int win_viewable(win_t *win)
 260 {
 261         XWindowAttributes attr;
 262         if (XGetWindowAttributes(win->sys->dpy, win->sys->xid, &attr))
 263                 return attr.map_state == IsViewable;
 264         else
 265                 return True;
 266 }
 267
 268 /* Drawing functions */
 269 static unsigned long get_color(Display *dpy, const char *name)
 270 {
 271         XColor color;
 272         int screen = DefaultScreen(dpy);
 273         Colormap cmap = DefaultColormap(dpy, screen);
 274         XAllocNamedColor(dpy, cmap, name, &color, &color);
 275         return color.pixel;
 276 }
 277
 278 /* Callbacks */
 279 static void process_event(int type, XEvent *ev, win_t *root)
 280 {
 281         Display  *dpy = root->sys->dpy;
 282         win_t *win = NULL;
 283         //printf("event: %d\n", type);
 284
 285         /* Common data for all these events ... */
 286         ptr_t ptr = {}; mod_t mod = {};
 287         if (type == KeyPress    || type == KeyRelease    ||
 288             type == ButtonPress || type == ButtonRelease ||
 289             type == MotionNotify) {
 290                 Window xid = getfocus(root, ev);
 291                 if (!(win = win_find(dpy,xid,0)))
 292                         return;
 293                 ptr = x2ptr(ev);
 294                 mod = x2mod(ev->xkey.state, type==KeyRelease||type==ButtonRelease);
 295         }
 296
 297         /* Split based on event */
 298         if (type == KeyPress) {
 299                 while (XCheckTypedEvent(dpy, KeyPress, ev));
 300                 KeySym sym = XKeycodeToKeysym(dpy, ev->xkey.keycode, 0);
 301                 printf("got key %c %hhx\n", x2key(sym), mod2int(mod));
 302                 wm_handle_key(win, x2key(sym), mod, ptr);
 303         }
 304         else if (type == KeyRelease) {
 305                 //printf("release: %d\n", type);
 306         }
 307         else if (type == ButtonPress) {
 308                 if (wm_handle_key(win, x2btn(ev->xbutton.button), mod, ptr))
 309                         XGrabPointer(dpy, ev->xbutton.root, True, PointerMotionMask|ButtonReleaseMask,
 310                                         GrabModeAsync, GrabModeAsync, None, None, CurrentTime);
 311                 else {
 312                         printf("resending event\n");
 313                         XSendEvent(win->sys->dpy, ev->xbutton.window,    True,  NoEventMask, ev);
 314                         XSendEvent(win->sys->dpy, ev->xbutton.window,    False, NoEventMask, ev);
 315                         XSendEvent(win->sys->dpy, ev->xbutton.root,      True,  NoEventMask, ev);
 316                         XSendEvent(win->sys->dpy, ev->xbutton.root,      False, NoEventMask, ev);
 317                         XSendEvent(win->sys->dpy, ev->xbutton.subwindow, True,  NoEventMask, ev);
 318                         XSendEvent(win->sys->dpy, ev->xbutton.subwindow, False, NoEventMask, ev);
 319                 }
 320         }
 321         else if (type == ButtonRelease) {
 322                 XUngrabPointer(dpy, CurrentTime);
 323                 wm_handle_key(win, x2btn(ev->xbutton.button), mod, ptr);
 324         }
 325         else if (type == MotionNotify) {
 326                 while (XCheckTypedEvent(dpy, MotionNotify, ev));
 327                 wm_handle_ptr(win, ptr);
 328         }
 329         else if (type == EnterNotify || type == LeaveNotify) {
 330                 printf("enter: %d\n", type);
 331                 key_t key = EnterNotify ? key_enter : key_leave;
 332                 if ((win = win_find(dpy,ev->xcrossing.window,0)))
 333                         wm_handle_key(win, key, MOD(), PTR());
 334         }
 335         else if (type == FocusIn || type == FocusOut) {
 336                 //printf("focus: %d\n", type);
 337                 key_t key = FocusIn ? key_focus : key_unfocus;
 338                 if ((win = win_find(dpy,ev->xfocus.window,0)))
 339                         wm_handle_key(win, key, MOD(), PTR());
 340         }
 341         else if (type == ConfigureNotify) {
 342                 printf("configure: %d\n", type);
 343         }
 344         else if (type == MapNotify) {
 345                 printf("map: %d\n", type);
 346         }
 347         else if (type == UnmapNotify) {
 348                 if ((win = win_find(dpy,ev->xunmap.window,0)) &&
 349                      win->sys->state == st_show) {
 350                         if (!strut_del(root, win))
 351                                 wm_remove(win);
 352                         else
 353                                 wm_update();
 354                         win->sys->state = st_hide;
 355                 }
 356         }
 357         else if (type == DestroyNotify) {
 358                 //printf("destroy: %d\n", type);
 359                 if ((win = win_find(dpy,ev->xdestroywindow.window,0)))
 360                         win_remove(win);
 361         }
 362         else if (type == ConfigureRequest) {
 363                 XConfigureRequestEvent *cre = &ev->xconfigurerequest;
 364                 printf("configure_req: %d - %x, (0x%lx) %dx%d @ %d,%d\n",
 365                                 type, (int)cre->window, cre->value_mask,
 366                                 cre->height, cre->width, cre->x, cre->y);
 367                 XConfigureWindow(dpy, cre->window, cre->value_mask, &(XWindowChanges){
 368                         .x      = cre->x,
 369                         .y      = cre->y,
 370                         .width  = cre->width,
 371                         .height = cre->height,
 372                 });
 373
 374                 /* This seems necessary for, but causes flicker
 375                  * there could be a better way to do this */
 376                 if ((win = win_find(dpy,ev->xmaprequest.window,0)))
 377                         sys_move(win, win->x, win->y, win->w, win->h);
 378         }
 379         else if (type == MapRequest) {
 380                 printf("map_req: %d\n", type);
 381                 if ((win = win_find(dpy,ev->xmaprequest.window,1))) {
 382                         if (!strut_add(root, win))
 383                                 wm_insert(win);
 384                         else
 385                                 wm_update();
 386                 }
 387                 XMapWindow(dpy,ev->xmaprequest.window);
 388         }
 389         else {
 390                 printf("unknown event: %d\n", type);
 391         }
 392 }
 393
 394 static int xerror(Display *dpy, XErrorEvent *err)
 395 {
 396         if (err->error_code == BadWindow ||
 397             (err->request_code == X_SetInputFocus     && err->error_code == BadMatch   ) ||
 398             (err->request_code == X_PolyText8         && err->error_code == BadDrawable) ||
 399             (err->request_code == X_PolyFillRectangle && err->error_code == BadDrawable) ||
 400             (err->request_code == X_PolySegment       && err->error_code == BadDrawable) ||
 401             (err->request_code == X_ConfigureWindow   && err->error_code == BadMatch   ) ||
 402             (err->request_code == X_GrabButton        && err->error_code == BadAccess  ) ||
 403             (err->request_code == X_GrabKey           && err->error_code == BadAccess  ) ||
 404             (err->request_code == X_CopyArea          && err->error_code == BadDrawable))
 405                 return 0;
 406         return xerrorxlib(dpy, err);
 407 }
 408
 409 /********************
 410  * System functions *
 411  ********************/
 412 void sys_move(win_t *win, int x, int y, int w, int h)
 413 {
 414         //printf("sys_move: %p - %d,%d  %dx%d\n", win, x, y, w, h);
 415         int b = 2*BORDER;
 416         win->x = x; win->y = y;
 417         win->w = MAX(w,1+b); win->h = MAX(h,1+b);
 418         w      = MAX(w-b,1); h      = MAX(h-b,1);
 419         XMoveResizeWindow(win->sys->dpy, win->sys->xid, x, y, w, h);
 420
 421         /* Flush events, so moving window doesn't cause re-focus
 422          * There's probably a better way to do this */
 423         XEvent ev;
 424         XSync(win->sys->dpy, False);
 425         while (XCheckMaskEvent(win->sys->dpy, EnterWindowMask|LeaveWindowMask, &ev))
 426                 printf("Skipping enter/leave event\n");
 427 }
 428
 429 void sys_raise(win_t *win)
 430 {
 431         //printf("sys_raise: %p\n", win);
 432         XRaiseWindow(win->sys->dpy, win->sys->xid);
 433 }
 434
 435 void sys_focus(win_t *win)
 436 {
 437         //printf("sys_focus: %p\n", win);
 438
 439         /* Set border on focused window */
 440         static win_t *last = NULL;
 441         if (last)
 442                 XSetWindowBorder(last->sys->dpy, last->sys->xid, colors[clr_unfocus]);
 443         XSetWindowBorder(win->sys->dpy, win->sys->xid, colors[clr_focus]);
 444         XSetWindowBorderWidth(win->sys->dpy, win->sys->xid, BORDER);
 445         last = win;
 446
 447         /* Set actual focus */
 448         XSetInputFocus(win->sys->dpy, win->sys->xid,
 449                         RevertToPointerRoot, CurrentTime);
 450         XSendEvent(win->sys->dpy, win->sys->xid, False, NoEventMask, &(XEvent){
 451                 .type                 = ClientMessage,
 452                 .xclient.window       = win->sys->xid,
 453                 .xclient.message_type = atoms[wm_proto],
 454                 .xclient.format       = 32,
 455                 .xclient.data.l[0]    = atoms[wm_focus],
 456                 .xclient.data.l[1]    = CurrentTime,
 457         });
 458 }
 459
 460 void sys_show(win_t *win, state_t state)
 461 {
 462         win->sys->state = state;
 463         switch (state) {
 464         case st_show:
 465                 printf("sys_show: show\n");
 466                 XMapWindow(win->sys->dpy, win->sys->xid);
 467                 XSync(win->sys->dpy, False);
 468                 return;
 469         case st_full:
 470                 printf("sys_show: full\n");
 471                 return;
 472         case st_shade:
 473                 printf("sys_show: shade\n");
 474                 return;
 475         case st_icon:
 476                 printf("sys_show: icon\n");
 477                 return;
 478         case st_hide:
 479                 printf("sys_show: hide\n");
 480                 XUnmapWindow(win->sys->dpy, win->sys->xid);
 481                 return;
 482         }
 483 }
 484
 485 void sys_watch(win_t *win, Key_t key, mod_t mod)
 486 {
 487         //printf("sys_watch: %p - %x %hhx\n", win, key, mod);
 488         XWindowAttributes attr;
 489         XGetWindowAttributes(win->sys->dpy, win->sys->xid, &attr);
 490         long mask = attr.your_event_mask;
 491         if (key_mouse0 <= key && key <= key_mouse7)
 492                 XGrabButton(win->sys->dpy, btn2x(key), mod2x(mod), win->sys->xid, False,
 493                                 mod.up ? ButtonReleaseMask : ButtonPressMask,
 494                                 GrabModeAsync, GrabModeAsync, None, None);
 495         else if (key == key_enter)
 496                 XSelectInput(win->sys->dpy, win->sys->xid, EnterWindowMask|mask);
 497         else if (key == key_leave)
 498                 XSelectInput(win->sys->dpy, win->sys->xid, LeaveWindowMask|mask);
 499         else if (key == key_focus || key == key_unfocus)
 500                 XSelectInput(win->sys->dpy, win->sys->xid, FocusChangeMask|mask);
 501         else
 502                 XGrabKey(win->sys->dpy, XKeysymToKeycode(win->sys->dpy, key2x(key)),
 503                                 mod2x(mod), win->sys->xid, True, GrabModeAsync, GrabModeAsync);
 504 }
 505
 506 void sys_unwatch(win_t *win, Key_t key, mod_t mod)
 507 {
 508         if (key_mouse0 <= key && key <= key_mouse7)
 509                 XUngrabButton(win->sys->dpy, btn2x(key), mod2x(mod), win->sys->xid);
 510 }
 511
 512 list_t *sys_info(win_t *win)
 513 {
 514         /* Use global copy of screens so we can add struts */
 515         if (screens == NULL) {
 516                 /* Add Xinerama screens */
 517                 int n = 0;
 518                 XineramaScreenInfo *info = NULL;
 519                 if (XineramaIsActive(win->sys->dpy))
 520                         info = XineramaQueryScreens(win->sys->dpy, &n);
 521                 for (int i = 0; i < n; i++) {
 522                         win_t *screen = new0(win_t);
 523                         screen->x = info[i].x_org;
 524                         screen->y = info[i].y_org;
 525                         screen->w = info[i].width;
 526                         screen->h = info[i].height;
 527                         screens = list_append(screens, screen);
 528                 }
 529         }
 530         if (screens == NULL) {
 531                 /* No xinerama support */
 532                 win_t *screen = new0(win_t);
 533                 *screen = *win;
 534                 screens = list_insert(NULL, screen);
 535         }
 536         return screens;
 537 }
 538
 539 win_t *sys_init(void)
 540 {
 541         Display *dpy;
 542         Window   xid;
 543
 544         /* Load configuration */
 545         BORDER     = conf_get_int("main.border",     BORDER);
 546         NO_CAPTURE = conf_get_int("main.no-capture", NO_CAPTURE);
 547
 548         /* Open the display */
 549         if (!(dpy = XOpenDisplay(NULL)))
 550                 error("Unable to get display");
 551         if (!(xid = DefaultRootWindow(dpy)))
 552                 error("Unable to get root window");
 553
 554         /* Setup X11 data */
 555         atoms[wm_proto]  = XInternAtom(dpy, "WM_PROTOCOLS",  False);
 556         atoms[wm_focus]  = XInternAtom(dpy, "WM_TAKE_FOCUS", False);
 557         atoms[net_strut] = XInternAtom(dpy, "_NET_WM_STRUT", False);
 558
 559         colors[clr_focus]   = get_color(dpy, "#a0a0ff");
 560         colors[clr_unfocus] = get_color(dpy, "#101066");
 561         colors[clr_urgent]  = get_color(dpy, "#ff0000");
 562         printf("colors = #%06lx #%06lx #%06lx\n", colors[0], colors[1], colors[2]);
 563
 564         /* Select window management events */
 565         XSelectInput(dpy, xid, SubstructureRedirectMask|SubstructureNotifyMask);
 566         XSetInputFocus(dpy, None, RevertToNone, CurrentTime);
 567         xerrorxlib = XSetErrorHandler(xerror);
 568
 569         return win_find(dpy, xid, 1);
 570 }
 571
 572 void sys_run(win_t *root)
 573 {
 574         /* Add each initial window */
 575         if (!NO_CAPTURE) {
 576                 unsigned int nkids;
 577                 Window par, xid, *kids = NULL;
 578                 if (XQueryTree(root->sys->dpy, root->sys->xid,
 579                                         &par, &xid, &kids, &nkids)) {
 580                         for(int i = 0; i < nkids; i++) {
 581                                 win_t *win = win_find(root->sys->dpy, kids[i], 1);
 582                                 if (win && win_viewable(win) && !strut_add(root,win))
 583                                         wm_insert(win);
 584                         }
 585                         XFree(kids);
 586                 }
 587                 wm_update(); // For struts
 588         }
 589
 590         /* Main loop */
 591         running = 1;
 592         while (running)
 593         {
 594                 XEvent ev;
 595                 XNextEvent(root->sys->dpy, &ev);
 596                 process_event(ev.type, &ev, root);
 597         }
 598 }
 599
 600 void sys_exit(void)
 601 {
 602         running = 0;
 603 }
 604
 605 void sys_free(win_t *root)
 606 {
 607         XCloseDisplay(root->sys->dpy);
 608         while (screens)
 609                 screens = list_remove(screens, screens, 1);
 610         tdestroy(cache, (void(*)(void*))win_free);
 611 }