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

   1 /*
   2  * Copyright (c) 2011-2012, 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         event_t ev;
  48         int     sym;
  49 } event_map_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 static list_t *struts;
  67
  68 /* Conversion functions */
  69 static event_map_t ev2sym[] = {
  70         {EV_LEFT    , XK_Left },
  71         {EV_RIGHT   , XK_Right},
  72         {EV_UP      , XK_Up   },
  73         {EV_DOWN    , XK_Down },
  74         {EV_HOME    , XK_Home },
  75         {EV_END     , XK_End  },
  76         {EV_PAGEUP  , XK_Prior},
  77         {EV_PAGEDOWN, XK_Next },
  78         {EV_F1      , XK_F1   },
  79         {EV_F2      , XK_F2   },
  80         {EV_F3      , XK_F3   },
  81         {EV_F4      , XK_F4   },
  82         {EV_F5      , XK_F5   },
  83         {EV_F6      , XK_F6   },
  84         {EV_F7      , XK_F7   },
  85         {EV_F8      , XK_F8   },
  86         {EV_F9      , XK_F9   },
  87         {EV_F10     , XK_F10  },
  88         {EV_F11     , XK_F11  },
  89         {EV_F12     , XK_F12  },
  90 };
  91
  92 /* - Modifiers */
  93 static mod_t x2mod(unsigned int state, int up)
  94 {
  95         return (mod_t){
  96                .alt   = !!(state & Mod1Mask   ),
  97                .ctrl  = !!(state & ControlMask),
  98                .shift = !!(state & ShiftMask  ),
  99                .win   = !!(state & Mod4Mask   ),
 100                .up    = up,
 101         };
 102 }
 103
 104 static unsigned int mod2x(mod_t mod)
 105 {
 106         return (mod.alt   ? Mod1Mask    : 0)
 107              | (mod.ctrl  ? ControlMask : 0)
 108              | (mod.shift ? ShiftMask   : 0)
 109              | (mod.win   ? Mod4Mask    : 0);
 110 }
 111
 112 /* - Keycodes */
 113 static event_t xk2ev(KeySym sym)
 114 {
 115         event_map_t *em = map_getr(ev2sym,sym);
 116         return em ? em->ev : sym;
 117 }
 118
 119 static KeySym ev2xk(event_t ev)
 120 {
 121         event_map_t *em = map_get(ev2sym,ev);
 122         return em ? em->sym : ev;
 123 }
 124
 125 static event_t xb2ev(int btn)
 126 {
 127         return btn + EV_MOUSE0;
 128 }
 129
 130 static int ev2xb(event_t ev)
 131 {
 132         return ev - EV_MOUSE0;
 133 }
 134
 135 /* - Pointers */
 136 static ptr_t x2ptr(XEvent *xe)
 137 {
 138         XKeyEvent *xke = &xe->xkey;
 139         return (ptr_t){xke->x, xke->y, xke->x_root, xke->y_root};
 140 }
 141
 142 static Window getfocus(win_t *root, XEvent *xe)
 143 {
 144         int revert;
 145         Window focus = PointerRoot;
 146         if (xe->type == KeyPress || xe->type == KeyRelease)
 147                 XGetInputFocus(root->sys->dpy, &focus, &revert);
 148         if (focus == PointerRoot)
 149                 focus = xe->xkey.subwindow;
 150         if (focus == None)
 151                 focus = xe->xkey.window;
 152         return focus;
 153 }
 154
 155 /* Strut functions
 156  *   Struts are spaces at the edges of the screen that are used by
 157  *   toolbars and statusbars such as dzen. */
 158 static int strut_copy(win_t *to, win_t *from, int scale)
 159 {
 160         int left   = from->sys->strut.left;
 161         int right  = from->sys->strut.right;
 162         int top    = from->sys->strut.top;
 163         int bottom = from->sys->strut.bottom;
 164         if (left == 0 && right == 0 && top == 0 && bottom == 0)
 165                 return 0;
 166         to->x += scale*(left      );
 167         to->y += scale*(top       );
 168         to->w -= scale*(left+right);
 169         to->h -= scale*(top+bottom);
 170         return 1;
 171 }
 172
 173 static int strut_add(win_t *root, win_t *win)
 174 {
 175         /* Get X11 strut data */
 176         Atom ret_type;
 177         int ret_size;
 178         unsigned long ret_items, bytes_left;
 179         unsigned char *xdata;
 180         int status = XGetWindowProperty(win->sys->dpy, win->sys->xid,
 181                         atoms[NET_STRUT], 0L, 4L, False, XA_CARDINAL,
 182                         &ret_type, &ret_size, &ret_items, &bytes_left, &xdata);
 183         if (status != Success || ret_size != 32 || ret_items != 4)
 184                 return 0;
 185
 186         win->sys->strut.left   = ((int*)xdata)[0];
 187         win->sys->strut.right  = ((int*)xdata)[1];
 188         win->sys->strut.top    = ((int*)xdata)[2];
 189         win->sys->strut.bottom = ((int*)xdata)[3];
 190         struts = list_insert(struts, win);
 191         for (list_t *cur = screens; cur; cur = cur->next)
 192                 strut_copy(cur->data, win, 1);
 193         return strut_copy(root, win, 1);
 194 }
 195
 196 static int strut_del(win_t *root, win_t *win)
 197 {
 198         list_t *lwin = list_find(struts, win);
 199         if (lwin)
 200                 struts = list_remove(struts, lwin, 0);
 201         for (list_t *cur = screens; cur; cur = cur->next)
 202                 strut_copy(cur->data, win, -1);
 203         return strut_copy(root, win, -1);
 204 }
 205
 206 /* Window functions */
 207 static win_t *win_new(Display *dpy, Window xid)
 208 {
 209         XWindowAttributes attr;
 210         if (XGetWindowAttributes(dpy, xid, &attr))
 211                 if (attr.override_redirect)
 212                         return NULL;
 213         win_t *win    = new0(win_t);
 214         win->x        = attr.x;
 215         win->y        = attr.y;
 216         win->w        = attr.width;
 217         win->h        = attr.height;
 218         win->sys      = new0(win_sys_t);
 219         win->sys->dpy = dpy;
 220         win->sys->xid = xid;
 221         printf("win_new: %p = %p, %d (%d,%d %dx%d)\n",
 222                         win, dpy, (int)xid,
 223                         win->x, win->y, win->w, win->h);
 224         return win;
 225 }
 226
 227 static int win_cmp(const void *_a, const void *_b)
 228 {
 229         const win_t *a = _a, *b = _b;
 230         if (a->sys->dpy < b->sys->dpy) return -1;
 231         if (a->sys->dpy > b->sys->dpy) return  1;
 232         if (a->sys->xid < b->sys->xid) return -1;
 233         if (a->sys->xid > b->sys->xid) return  1;
 234         return 0;
 235 }
 236
 237 static win_t *win_find(Display *dpy, Window xid, int create)
 238 {
 239         if (!dpy || !xid)
 240                 return NULL;
 241         //printf("win_find: %p, %d\n", dpy, (int)xid);
 242         win_sys_t sys = {.dpy=dpy, .xid=xid};
 243         win_t     tmp = {.sys=&sys};
 244         win_t **old = NULL, *new = NULL;
 245         if ((old = tfind(&tmp, &cache, win_cmp)))
 246                 return *old;
 247         if (create && (new = win_new(dpy,xid)))
 248                 tsearch(new, &cache, win_cmp);
 249         return new;
 250 }
 251
 252 static void win_free(win_t *win)
 253 {
 254         free(win->sys);
 255         free(win);
 256 }
 257
 258 static void win_remove(win_t *win)
 259 {
 260         tdelete(win, &cache, win_cmp);
 261         win_free(win);
 262 }
 263
 264 static int win_viewable(win_t *win)
 265 {
 266         XWindowAttributes attr;
 267         if (XGetWindowAttributes(win->sys->dpy, win->sys->xid, &attr))
 268                 return attr.map_state == IsViewable;
 269         else
 270                 return True;
 271 }
 272
 273 /* Drawing functions */
 274 static unsigned long get_color(Display *dpy, const char *name)
 275 {
 276         XColor color;
 277         int screen = DefaultScreen(dpy);
 278         Colormap cmap = DefaultColormap(dpy, screen);
 279         XAllocNamedColor(dpy, cmap, name, &color, &color);
 280         return color.pixel;
 281 }
 282
 283 /* Callbacks */
 284 static void process_event(int type, XEvent *xe, win_t *root)
 285 {
 286         Display  *dpy = root->sys->dpy;
 287         win_t *win = NULL;
 288         //printf("event: %d\n", type);
 289
 290         /* Common data for all these events ... */
 291         ptr_t ptr = {}; mod_t mod = {};
 292         if (type == KeyPress    || type == KeyRelease    ||
 293             type == ButtonPress || type == ButtonRelease ||
 294             type == MotionNotify) {
 295                 Window xid = getfocus(root, xe);
 296                 if (!(win = win_find(dpy,xid,0)))
 297                         return;
 298                 ptr = x2ptr(xe);
 299                 mod = x2mod(xe->xkey.state, type==KeyRelease||type==ButtonRelease);
 300         }
 301
 302         /* Split based on event */
 303         if (type == KeyPress) {
 304                 while (XCheckTypedEvent(dpy, KeyPress, xe));
 305                 KeySym sym = XKeycodeToKeysym(dpy, xe->xkey.keycode, 0);
 306                 printf("got xe %c %hhx\n", xk2ev(sym), mod2int(mod));
 307                 wm_handle_event(win, xk2ev(sym), mod, ptr);
 308         }
 309         else if (type == KeyRelease) {
 310                 //printf("release: %d\n", type);
 311         }
 312         else if (type == ButtonPress) {
 313                 if (wm_handle_event(win, xb2ev(xe->xbutton.button), mod, ptr))
 314                         XGrabPointer(dpy, xe->xbutton.root, True, PointerMotionMask|ButtonReleaseMask,
 315                                         GrabModeAsync, GrabModeAsync, None, None, CurrentTime);
 316                 else
 317                         XAllowEvents(win->sys->dpy, ReplayPointer, CurrentTime);
 318         }
 319         else if (type == ButtonRelease) {
 320                 XUngrabPointer(dpy, CurrentTime);
 321                 wm_handle_event(win, xb2ev(xe->xbutton.button), mod, ptr);
 322         }
 323         else if (type == MotionNotify) {
 324                 while (XCheckTypedEvent(dpy, MotionNotify, xe));
 325                 wm_handle_ptr(win, ptr);
 326         }
 327         else if (type == EnterNotify || type == LeaveNotify) {
 328                 printf("%s: %d\n", type==EnterNotify?"enter":"leave", type);
 329                 event_t ev = EnterNotify ? EV_ENTER : EV_LEAVE;
 330                 if ((win = win_find(dpy,xe->xcrossing.window,0)))
 331                         wm_handle_event(win, ev, MOD(), PTR());
 332         }
 333         else if (type == FocusIn || type == FocusOut) {
 334                 //printf("focus: %d\n", type);
 335                 event_t ev = FocusIn ? EV_FOCUS : EV_UNFOCUS;
 336                 if ((win = win_find(dpy,xe->xfocus.window,0)))
 337                         wm_handle_event(win, ev, MOD(), PTR());
 338         }
 339         else if (type == ConfigureNotify) {
 340                 printf("configure: %d\n", type);
 341         }
 342         else if (type == MapNotify) {
 343                 printf("map: %d\n", type);
 344         }
 345         else if (type == UnmapNotify) {
 346                 if ((win = win_find(dpy,xe->xunmap.window,0)) &&
 347                      win->sys->state != ST_HIDE) {
 348                         if (!strut_del(root, win))
 349                                 wm_remove(win);
 350                         else
 351                                 wm_update();
 352                         win->sys->state = ST_HIDE;
 353                 }
 354         }
 355         else if (type == DestroyNotify) {
 356                 //printf("destroy: %d\n", type);
 357                 if ((win = win_find(dpy,xe->xdestroywindow.window,0)))
 358                         win_remove(win);
 359         }
 360         else if (type == ConfigureRequest) {
 361                 XConfigureRequestEvent *cre = &xe->xconfigurerequest;
 362                 printf("configure_req: %d - %x, (0x%lx) %dx%d @ %d,%d\n",
 363                                 type, (int)cre->window, cre->value_mask,
 364                                 cre->height, cre->width, cre->x, cre->y);
 365                 if ((win = win_find(dpy,xe->xmaprequest.window,1))) {
 366                         XSendEvent(dpy, cre->window, False, StructureNotifyMask, &(XEvent){
 367                                 .xconfigure.type              = ConfigureNotify,
 368                                 .xconfigure.display           = win->sys->dpy,
 369                                 .xconfigure.event             = win->sys->xid,
 370                                 .xconfigure.window            = win->sys->xid,
 371                                 .xconfigure.x                 = win->x,
 372                                 .xconfigure.y                 = win->y,
 373                                 .xconfigure.width             = win->w,
 374                                 .xconfigure.height            = win->h,
 375                         });
 376                         XSync(win->sys->dpy, False);
 377                 }
 378         }
 379         else if (type == MapRequest) {
 380                 printf("map_req: %d\n", type);
 381                 if ((win = win_find(dpy,xe->xmaprequest.window,1))) {
 382                         if (!strut_add(root, win))
 383                                 wm_insert(win);
 384                         else
 385                                 wm_update();
 386                 }
 387                 XMapWindow(dpy, xe->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 xe;
 424         XSync(win->sys->dpy, False);
 425         while (XCheckMaskEvent(win->sys->dpy, EnterWindowMask|LeaveWindowMask, &xe))
 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         for (list_t *cur = struts; cur; cur = cur->next)
 434                 XRaiseWindow(((win_t*)cur->data)->sys->dpy,
 435                              ((win_t*)cur->data)->sys->xid);
 436 }
 437
 438 void sys_focus(win_t *win)
 439 {
 440         //printf("sys_focus: %p\n", win);
 441
 442         /* Set border on focused window */
 443         static win_t *last = NULL;
 444         if (last)
 445                 XSetWindowBorder(last->sys->dpy, last->sys->xid, colors[CLR_UNFOCUS]);
 446         XSetWindowBorder(win->sys->dpy, win->sys->xid, colors[CLR_FOCUS]);
 447         XSetWindowBorderWidth(win->sys->dpy, win->sys->xid, border);
 448         last = win;
 449
 450         /* Set actual focus */
 451         XSetInputFocus(win->sys->dpy, win->sys->xid,
 452                         RevertToPointerRoot, CurrentTime);
 453         XSendEvent(win->sys->dpy, win->sys->xid, False, NoEventMask, &(XEvent){
 454                 .type                 = ClientMessage,
 455                 .xclient.window       = win->sys->xid,
 456                 .xclient.message_type = atoms[WM_PROTO],
 457                 .xclient.format       = 32,
 458                 .xclient.data.l[0]    = atoms[WM_FOCUS],
 459                 .xclient.data.l[1]    = CurrentTime,
 460         });
 461 }
 462
 463 void sys_show(win_t *win, state_t state)
 464 {
 465         win->sys->state = state;
 466         switch (state) {
 467         case ST_SHOW:
 468                 printf("sys_show: show\n");
 469                 XMapWindow(win->sys->dpy, win->sys->xid);
 470                 XSync(win->sys->dpy, False);
 471                 return;
 472         case ST_FULL:
 473                 printf("sys_show: full\n");
 474                 XMapWindow(win->sys->dpy, win->sys->xid);
 475                 return;
 476         case ST_SHADE:
 477                 printf("sys_show: shade\n");
 478                 XMapWindow(win->sys->dpy, win->sys->xid);
 479                 return;
 480         case ST_ICON:
 481                 printf("sys_show: icon\n");
 482                 return;
 483         case ST_HIDE:
 484                 printf("sys_show: hide\n");
 485                 XUnmapWindow(win->sys->dpy, win->sys->xid);
 486                 return;
 487         case ST_CLOSE:
 488                 printf("sys_show: close\n");
 489                 XDestroyWindow(win->sys->dpy, win->sys->xid);
 490                 return;
 491         }
 492 }
 493
 494 void sys_watch(win_t *win, event_t ev, mod_t mod)
 495 {
 496         //printf("sys_watch: %p - %x %hhx\n", win, ev, mod);
 497         XWindowAttributes attr;
 498         XGetWindowAttributes(win->sys->dpy, win->sys->xid, &attr);
 499         long mask = attr.your_event_mask;
 500         if (EV_MOUSE0 <= ev && ev <= EV_MOUSE7)
 501                 XGrabButton(win->sys->dpy, ev2xb(ev), mod2x(mod), win->sys->xid, False,
 502                                 mod.up ? ButtonReleaseMask : ButtonPressMask,
 503                                 GrabModeSync, GrabModeAsync, None, None);
 504         else if (ev == EV_ENTER)
 505                 XSelectInput(win->sys->dpy, win->sys->xid, EnterWindowMask|mask);
 506         else if (ev == EV_LEAVE)
 507                 XSelectInput(win->sys->dpy, win->sys->xid, LeaveWindowMask|mask);
 508         else if (ev == EV_FOCUS || ev == EV_UNFOCUS)
 509                 XSelectInput(win->sys->dpy, win->sys->xid, FocusChangeMask|mask);
 510         else
 511                 XGrabKey(win->sys->dpy, XKeysymToKeycode(win->sys->dpy, ev2xk(ev)),
 512                                 mod2x(mod), win->sys->xid, True, GrabModeAsync, GrabModeAsync);
 513 }
 514
 515 void sys_unwatch(win_t *win, event_t ev, mod_t mod)
 516 {
 517         if (EV_MOUSE0 <= ev && ev <= EV_MOUSE7)
 518                 XUngrabButton(win->sys->dpy, ev2xb(ev), mod2x(mod), win->sys->xid);
 519 }
 520
 521 list_t *sys_info(win_t *win)
 522 {
 523         /* Use global copy of screens so we can add struts */
 524         if (screens == NULL) {
 525                 /* Add Xinerama screens */
 526                 int n = 0;
 527                 XineramaScreenInfo *info = NULL;
 528                 if (XineramaIsActive(win->sys->dpy))
 529                         info = XineramaQueryScreens(win->sys->dpy, &n);
 530                 for (int i = 0; i < n; i++) {
 531                         win_t *screen = new0(win_t);
 532                         screen->x = info[i].x_org;
 533                         screen->y = info[i].y_org;
 534                         screen->w = info[i].width;
 535                         screen->h = info[i].height;
 536                         screens = list_append(screens, screen);
 537                 }
 538         }
 539         if (screens == NULL) {
 540                 /* No xinerama support */
 541                 win_t *screen = new0(win_t);
 542                 *screen = *win;
 543                 screens = list_insert(NULL, screen);
 544         }
 545         return screens;
 546 }
 547
 548 win_t *sys_init(void)
 549 {
 550         Display *dpy;
 551         Window   xid;
 552
 553         /* Load configuration */
 554         border     = conf_get_int("main.border",     border);
 555         no_capture = conf_get_int("main.no-capture", no_capture);
 556
 557         /* Open the display */
 558         if (!(dpy = XOpenDisplay(NULL)))
 559                 error("Unable to get display");
 560         if (!(xid = DefaultRootWindow(dpy)))
 561                 error("Unable to get root window");
 562
 563         /* Setup X11 data */
 564         atoms[WM_PROTO]  = XInternAtom(dpy, "WM_PROTOCOLS",  False);
 565         atoms[WM_FOCUS]  = XInternAtom(dpy, "WM_TAKE_FOCUS", False);
 566         atoms[NET_STRUT] = XInternAtom(dpy, "_NET_WM_STRUT", False);
 567
 568         colors[CLR_FOCUS]   = get_color(dpy, "#a0a0ff");
 569         colors[CLR_UNFOCUS] = get_color(dpy, "#101066");
 570         colors[CLR_URGENT]  = get_color(dpy, "#ff0000");
 571         printf("colors = #%06lx #%06lx #%06lx\n", colors[0], colors[1], colors[2]);
 572
 573         /* Select window management events */
 574         XSelectInput(dpy, xid, SubstructureRedirectMask|SubstructureNotifyMask);
 575         xerrorxlib = XSetErrorHandler(xerror);
 576
 577         return win_find(dpy, xid, 1);
 578 }
 579
 580 void sys_run(win_t *root)
 581 {
 582         /* Add each initial window */
 583         if (!no_capture) {
 584                 unsigned int nkids;
 585                 Window par, xid, *kids = NULL;
 586                 if (XQueryTree(root->sys->dpy, root->sys->xid,
 587                                         &par, &xid, &kids, &nkids)) {
 588                         for(int i = 0; i < nkids; i++) {
 589                                 win_t *win = win_find(root->sys->dpy, kids[i], 1);
 590                                 if (win && win_viewable(win) && !strut_add(root,win))
 591                                         wm_insert(win);
 592                         }
 593                         XFree(kids);
 594                 }
 595                 wm_update(); // For struts
 596         }
 597
 598         /* Main loop */
 599         running = 1;
 600         while (running)
 601         {
 602                 XEvent xe;
 603                 XNextEvent(root->sys->dpy, &xe);
 604                 process_event(xe.type, &xe, root);
 605         }
 606 }
 607
 608 void sys_exit(void)
 609 {
 610         running = 0;
 611 }
 612
 613 void sys_free(win_t *root)
 614 {
 615         XCloseDisplay(root->sys->dpy);
 616         while (screens)
 617                 screens = list_remove(screens, screens, 1);
 618         tdestroy(cache, (void(*)(void*))win_free);
 619 }