code.delx.au - spectrwm/blob - scrotwm.c

   1 /* $scrotwm$ */
   2 /*
   3  * Copyright (c) 2009 Marco Peereboom <marco@peereboom.us>
   4  * Copyright (c) 2009 Ryan McBride <mcbride@countersiege.com>
   5  *
   6  * Permission to use, copy, modify, and distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  */
  18 /*
  19  * Much code and ideas taken from dwm under the following license:
  20  * MIT/X Consortium License
  21  *
  22  * 2006-2008 Anselm R Garbe <garbeam at gmail dot com>
  23  * 2006-2007 Sander van Dijk <a dot h dot vandijk at gmail dot com>
  24  * 2006-2007 Jukka Salmi <jukka at salmi dot ch>
  25  * 2007 Premysl Hruby <dfenze at gmail dot com>
  26  * 2007 Szabolcs Nagy <nszabolcs at gmail dot com>
  27  * 2007 Christof Musik <christof at sendfax dot de>
  28  * 2007-2008 Enno Gottox Boland <gottox at s01 dot de>
  29  * 2007-2008 Peter Hartlich <sgkkr at hartlich dot com>
  30  * 2008 Martin Hurton <martin dot hurton at gmail dot com>
  31  *
  32  * Permission is hereby granted, free of charge, to any person obtaining a
  33  * copy of this software and associated documentation files (the "Software"),
  34  * to deal in the Software without restriction, including without limitation
  35  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  36  * and/or sell copies of the Software, and to permit persons to whom the
  37  * Software is furnished to do so, subject to the following conditions:
  38  *
  39  * The above copyright notice and this permission notice shall be included in
  40  * all copies or substantial portions of the Software.
  41  *
  42  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  43  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  44  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  45  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  46  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  47  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  48  * DEALINGS IN THE SOFTWARE.
  49  */
  50
  51 #define SWM_VERSION     "0.5"
  52
  53 #include <stdio.h>
  54 #include <stdlib.h>
  55 #include <err.h>
  56 #include <locale.h>
  57 #include <unistd.h>
  58
  59 #include <sys/types.h>
  60 #include <sys/wait.h>
  61 #include <sys/queue.h>
  62
  63 #include <X11/cursorfont.h>
  64 #include <X11/keysym.h>
  65 #include <X11/Xatom.h>
  66 #include <X11/Xlib.h>
  67 #include <X11/Xproto.h>
  68 #include <X11/Xutil.h>
  69
  70 #define SWM_DEBUG
  71 #ifdef SWM_DEBUG
  72 #define DPRINTF(x...)           do { if (swm_debug) fprintf(stderr, x); } while(0)
  73 #define DNPRINTF(n,x...)        do { if (swm_debug & n) fprintf(stderr, x); } while(0)
  74 #define SWM_D_EVENT             0x0001
  75 #define SWM_D_WS                0x0002
  76 #define SWM_D_FOCUS             0x0004
  77 #define SWM_D_MISC              0x0008
  78
  79 uint32_t                swm_debug = 0
  80                             | SWM_D_EVENT
  81                             | SWM_D_WS
  82                             | SWM_D_FOCUS
  83                             | SWM_D_MISC
  84                             ;
  85 #else
  86 #define DPRINTF(x...)
  87 #define DNPRINTF(n,x...)
  88 #endif
  89
  90 #define LENGTH(x)               (sizeof x / sizeof x[0])
  91 #define MODKEY                  Mod1Mask
  92 #define CLEANMASK(mask)         (mask & ~(numlockmask | LockMask))
  93
  94 int                     (*xerrorxlib)(Display *, XErrorEvent *);
  95 int                     other_wm;
  96 int                     screen;
  97 int                     width, height;
  98 int                     running = 1;
  99 int                     ignore_enter = 0;
 100 unsigned int            numlockmask = 0;
 101 unsigned long           col_focus = 0xff0000;   /* XXX should this be per ws? */
 102 unsigned long           col_unfocus = 0x888888;
 103 Display                 *display;
 104 Window                  root;
 105
 106 struct ws_win {
 107         TAILQ_ENTRY(ws_win)     entry;
 108         Window                  id;
 109         int                     x;
 110         int                     y;
 111         int                     width;
 112         int                     height;
 113 };
 114
 115 TAILQ_HEAD(ws_win_list, ws_win);
 116
 117 /* define work spaces */
 118 #define SWM_WS_MAX              (10)
 119 struct workspace {
 120         int                      visible;       /* workspace visible */
 121         struct ws_win           *focus;         /* which win has focus */
 122         int                      winno;         /* total nr of windows */
 123         struct ws_win_list       winlist;
 124 } ws[SWM_WS_MAX];
 125 int                     current_ws = 0;
 126
 127 /* args to functions */
 128 union arg {
 129         int             id;
 130 #define SWM_ARG_ID_FOCUSNEXT    (0)
 131 #define SWM_ARG_ID_FOCUSPREV    (1)
 132 #define SWM_ARG_ID_FOCUSMAIN    (2)
 133         char            **argv;
 134 };
 135
 136 void
 137 quit(union arg *args)
 138 {
 139         DNPRINTF(SWM_D_MISC, "quit\n");
 140         running = 0;
 141 }
 142
 143 void
 144 spawn(union arg *args)
 145 {
 146         DNPRINTF(SWM_D_MISC, "spawn: %s\n", args->argv[0]);
 147         /*
 148          * The double-fork construct avoids zombie processes and keeps the code
 149          * clean from stupid signal handlers.
 150          */
 151         if(fork() == 0) {
 152                 if(fork() == 0) {
 153                         if(display)
 154                                 close(ConnectionNumber(display));
 155                         setsid();
 156                         execvp(args->argv[0], args->argv);
 157                         fprintf(stderr, "execvp failed\n");
 158                         perror(" failed");
 159                 }
 160                 exit(0);
 161         }
 162         wait(0);
 163 }
 164
 165 void
 166 focus_win(struct ws_win *win)
 167 {
 168         DNPRINTF(SWM_D_FOCUS, "focus_win: id: %d\n", win->id);
 169         XSetWindowBorder(display, win->id, col_focus);
 170         XSetInputFocus(display, win->id, RevertToPointerRoot, CurrentTime);
 171         ws[current_ws].focus = win;
 172 }
 173
 174 void
 175 unfocus_win(struct ws_win *win)
 176 {
 177         DNPRINTF(SWM_D_FOCUS, "unfocus_win: id: %d\n", win->id);
 178         XSetWindowBorder(display, win->id, col_unfocus);
 179         if (ws[current_ws].focus == win)
 180                 ws[current_ws].focus = NULL;
 181 }
 182
 183 void
 184 switchws(union arg *args)
 185 {
 186         int                     wsid = args->id;
 187         struct ws_win           *win;
 188         Window                  winfocus;
 189
 190         DNPRINTF(SWM_D_WS, "switchws: %d\n", wsid + 1);
 191
 192         if (wsid == current_ws)
 193                 return;
 194
 195         /* map new window first to prevent ugly blinking */
 196         TAILQ_FOREACH (win, &ws[wsid].winlist, entry)
 197                 XMapWindow(display, win->id);
 198         ws[wsid].visible = 1;
 199
 200         TAILQ_FOREACH (win, &ws[current_ws].winlist, entry)
 201                 XUnmapWindow(display, win->id);
 202         ws[current_ws].visible = 0;
 203
 204         current_ws = wsid;
 205
 206         ignore_enter = 1;
 207         if (ws[wsid].focus != NULL)
 208                 focus_win(ws[wsid].focus);
 209         XSync(display, False);
 210 }
 211
 212 void
 213 focus(union arg *args)
 214 {
 215         struct ws_win           *winfocus, *winlostfocus;
 216
 217         DNPRINTF(SWM_D_FOCUS, "focus: id %d\n", args->id);
 218         if (ws[current_ws].focus == NULL || ws[current_ws].winno == 0)
 219                 return;
 220
 221         winlostfocus = ws[current_ws].focus;
 222
 223         switch (args->id) {
 224         case SWM_ARG_ID_FOCUSPREV:
 225                 if (ws[current_ws].focus ==
 226                     TAILQ_FIRST(&ws[current_ws].winlist))
 227                         ws[current_ws].focus =
 228                             TAILQ_LAST(&ws[current_ws].winlist, ws_win_list);
 229                 else
 230                         ws[current_ws].focus =TAILQ_PREV(ws[current_ws].focus,
 231                             ws_win_list, entry);
 232                 break;
 233
 234         case SWM_ARG_ID_FOCUSNEXT:
 235                 if (ws[current_ws].focus == TAILQ_LAST(&ws[current_ws].winlist,
 236                     ws_win_list))
 237                         ws[current_ws].focus =
 238                             TAILQ_FIRST(&ws[current_ws].winlist);
 239                 else
 240                         ws[current_ws].focus =
 241                             TAILQ_NEXT(ws[current_ws].focus, entry);
 242                 break;
 243
 244         case SWM_ARG_ID_FOCUSMAIN:
 245                 ws[current_ws].focus = TAILQ_FIRST(&ws[current_ws].winlist);;
 246                 break;
 247
 248         default:
 249                 return;
 250         }
 251
 252         winfocus = ws[current_ws].focus;
 253         unfocus_win(winlostfocus);
 254         focus_win(winfocus);
 255         XSync(display, False);
 256 }
 257
 258 /* I know this sucks but it works well enough */
 259 void
 260 stack(void)
 261 {
 262         XWindowChanges          wc;
 263         struct ws_win           wf, *win, *winfocus = &wf;
 264         int                     i, h, w, x, y, winno, hrh;
 265
 266         DNPRINTF(SWM_D_EVENT, "stack: workspace: %d\n", current_ws);
 267
 268         winfocus->id = root;
 269
 270         if (ws[current_ws].winno == 0)
 271                 return;
 272
 273         if (ws[current_ws].winno > 1)
 274                 w = width / 2;
 275         else
 276                 w = width;
 277
 278         if (ws[current_ws].winno > 2)
 279                 hrh = height / (ws[current_ws].winno - 1);
 280         else
 281                 hrh = 0;
 282
 283         x = 0;
 284         y = 0;
 285         h = height;
 286         i = 0;
 287         TAILQ_FOREACH (win, &ws[current_ws].winlist, entry) {
 288                 if (i == 1) {
 289                         x += w + 2;
 290                         w -= 2;
 291                 }
 292                 if (i != 0 && hrh != 0) {
 293                         /* correct the last window for lost pixels */
 294                         if (win == TAILQ_LAST(&ws[current_ws].winlist,
 295                             ws_win_list)) {
 296                                 h = height - (i * hrh);
 297                                 if (h == 0)
 298                                         h = hrh;
 299                                 else
 300                                         h += hrh;
 301                                 y += hrh;
 302                         } else {
 303                                 h = hrh - 2;
 304                                 /* leave first right hand window at y = 0 */
 305                                 if (i > 1)
 306                                         y += h + 2;
 307                         }
 308                 }
 309
 310                 bzero(&wc, sizeof wc);
 311                 win->x = wc.x = x;
 312                 win->y = wc.y = y;
 313                 win->width = wc.width = w;
 314                 win->height = wc.height = h;
 315                 wc.border_width = 1;
 316                 XConfigureWindow(display, win->id, CWX | CWY | CWWidth |
 317                     CWHeight | CWBorderWidth, &wc);
 318                 if (win == ws[current_ws].focus)
 319                         winfocus = win;
 320                 else
 321                         unfocus_win(win);
 322                 XMapWindow(display, win->id);
 323                 i++;
 324         }
 325
 326         focus_win(winfocus); /* this has to be done outside of the loop */
 327         XSync(display, False);
 328 }
 329
 330 void
 331 swap_to_main(union arg *args)
 332 {
 333         struct ws_win           *tmpwin = TAILQ_FIRST(&ws[current_ws].winlist);
 334
 335         DNPRINTF(SWM_D_MISC, "swap_to_main: win: %d\n", ws[current_ws].focus->id);
 336         TAILQ_REMOVE(&ws[current_ws].winlist, tmpwin, entry);
 337         TAILQ_INSERT_AFTER(&ws[current_ws].winlist, ws[current_ws].focus,
 338             tmpwin, entry);
 339         TAILQ_REMOVE(&ws[current_ws].winlist, ws[current_ws].focus, entry);
 340         TAILQ_INSERT_HEAD(&ws[current_ws].winlist, ws[current_ws].focus, entry);
 341         ws[current_ws].focus = TAILQ_FIRST(&ws[current_ws].winlist);
 342         ignore_enter = 2;
 343         stack();
 344 }
 345
 346 /* terminal + args */
 347 char                            *term[] = { "xterm", NULL };
 348
 349 /* key definitions */
 350 struct key {
 351         unsigned int            mod;
 352         KeySym                  keysym;
 353         void                    (*func)(union arg *);
 354         union arg               args;
 355 } keys[] = {
 356         /* modifier             key     function                argument */
 357         { MODKEY,               XK_Return,      swap_to_main,   {0} },
 358         { MODKEY | ShiftMask,   XK_Return,      spawn,          {.argv = term } },
 359         { MODKEY | ShiftMask,   XK_q,           quit,           {0} },
 360         { MODKEY,               XK_m,           focus,          {.id = SWM_ARG_ID_FOCUSMAIN} },
 361         { MODKEY,               XK_1,           switchws,       {.id = 0} },
 362         { MODKEY,               XK_2,           switchws,       {.id = 1} },
 363         { MODKEY,               XK_3,           switchws,       {.id = 2} },
 364         { MODKEY,               XK_4,           switchws,       {.id = 3} },
 365         { MODKEY,               XK_5,           switchws,       {.id = 4} },
 366         { MODKEY,               XK_6,           switchws,       {.id = 5} },
 367         { MODKEY,               XK_7,           switchws,       {.id = 6} },
 368         { MODKEY,               XK_8,           switchws,       {.id = 7} },
 369         { MODKEY,               XK_9,           switchws,       {.id = 8} },
 370         { MODKEY,               XK_0,           switchws,       {.id = 9} },
 371         { MODKEY,               XK_Tab,         focus,          {.id = SWM_ARG_ID_FOCUSNEXT} },
 372         { MODKEY | ShiftMask,   XK_Tab,         focus,          {.id = SWM_ARG_ID_FOCUSPREV} },
 373 };
 374
 375 void
 376 updatenumlockmask(void)
 377 {
 378         unsigned int            i, j;
 379         XModifierKeymap         *modmap;
 380
 381         DNPRINTF(SWM_D_MISC, "updatenumlockmask\n");
 382         numlockmask = 0;
 383         modmap = XGetModifierMapping(display);
 384         for (i = 0; i < 8; i++)
 385                 for (j = 0; j < modmap->max_keypermod; j++)
 386                         if (modmap->modifiermap[i * modmap->max_keypermod + j]
 387                           == XKeysymToKeycode(display, XK_Num_Lock))
 388                                 numlockmask = (1 << i);
 389
 390         XFreeModifiermap(modmap);
 391 }
 392
 393 void
 394 grabkeys(void)
 395 {
 396         unsigned int            i, j;
 397         KeyCode                 code;
 398         unsigned int            modifiers[] =
 399             { 0, LockMask, numlockmask, numlockmask | LockMask };
 400
 401         DNPRINTF(SWM_D_MISC, "grabkeys\n");
 402         updatenumlockmask();
 403
 404         XUngrabKey(display, AnyKey, AnyModifier, root);
 405         for(i = 0; i < LENGTH(keys); i++) {
 406                 if((code = XKeysymToKeycode(display, keys[i].keysym)))
 407                         for(j = 0; j < LENGTH(modifiers); j++)
 408                                 XGrabKey(display, code,
 409                                     keys[i].mod | modifiers[j], root,
 410                                     True, GrabModeAsync, GrabModeAsync);
 411         }
 412 }
 413 void
 414 expose(XEvent *e)
 415 {
 416         XExposeEvent            *ev = &e->xexpose;
 417
 418         DNPRINTF(SWM_D_EVENT, "expose: window: %d\n", ev->window);
 419 }
 420
 421 void
 422 keypress(XEvent *e)
 423 {
 424         unsigned int            i;
 425         KeySym                  keysym;
 426         XKeyEvent               *ev = &e->xkey;
 427
 428         DNPRINTF(SWM_D_EVENT, "keypress: window: %d\n", ev->window);
 429
 430         keysym = XKeycodeToKeysym(display, (KeyCode)ev->keycode, 0);
 431         for(i = 0; i < LENGTH(keys); i++)
 432                 if(keysym == keys[i].keysym
 433                    && CLEANMASK(keys[i].mod) == CLEANMASK(ev->state)
 434                    && keys[i].func)
 435                         keys[i].func(&(keys[i].args));
 436 }
 437
 438 void
 439 buttonpress(XEvent *e)
 440 {
 441         XButtonPressedEvent     *ev = &e->xbutton;
 442         struct ws_win           *win;
 443
 444         DNPRINTF(SWM_D_EVENT, "buttonpress: window: %d\n", ev->window);
 445
 446         if (ev->window == root)
 447                 return;
 448         if (ev->window == ws[current_ws].focus->id)
 449                 return;
 450 #if 0
 451         TAILQ_FOREACH(win, &ws[current_ws].winlist, entry)
 452                 if (win->id == ev->window) {
 453                         /* focus in the clicked window */
 454                         XSetWindowBorder(display, ev->window, 0xff0000);
 455                         XSetWindowBorder(display,
 456                             ws[current_ws].focus->id, 0x888888);
 457                         XSetInputFocus(display, ev->window, RevertToPointerRoot,
 458                             CurrentTime);
 459                         ws[current_ws].focus = win;
 460                         XSync(display, False);
 461                         break;
 462         }
 463 #endif
 464 }
 465
 466 void
 467 configurerequest(XEvent *e)
 468 {
 469         XConfigureRequestEvent  *ev = &e->xconfigurerequest;
 470         struct ws_win           *win;
 471
 472         DNPRINTF(SWM_D_EVENT, "configurerequest: window: %d\n", ev->window);
 473
 474         XSelectInput(display, ev->window, ButtonPressMask | EnterWindowMask |
 475             FocusChangeMask);
 476
 477         if ((win = calloc(1, sizeof(struct ws_win))) == NULL)
 478                 errx(1, "calloc: failed to allocate memory for new window");
 479
 480         win->id = ev->window;
 481         TAILQ_INSERT_TAIL(&ws[current_ws].winlist, win, entry);
 482         ws[current_ws].focus = win; /* make new win focused */
 483         ws[current_ws].winno++;
 484         stack();
 485 }
 486
 487 void
 488 configurenotify(XEvent *e)
 489 {
 490         XConfigureEvent         *ev = &e->xconfigure;
 491
 492         DNPRINTF(SWM_D_EVENT, "configurenotify: window: %d\n", ev->window);
 493 }
 494
 495 void
 496 destroynotify(XEvent *e)
 497 {
 498         size_t                   sz;
 499         struct ws_win           *win;
 500         XDestroyWindowEvent     *ev = &e->xdestroywindow;
 501
 502         DNPRINTF(SWM_D_EVENT, "destroynotify: window %d\n", ev->window);
 503
 504         TAILQ_FOREACH (win, &ws[current_ws].winlist, entry) {
 505                 if (ev->window == win->id) {
 506                         /* find a window to focus */
 507                         ws[current_ws].focus =
 508                             TAILQ_PREV(win, ws_win_list,entry);
 509                         if (ws[current_ws].focus == NULL)
 510                                 ws[current_ws].focus =
 511                                     TAILQ_FIRST(&ws[current_ws].winlist);
 512
 513                         TAILQ_REMOVE(&ws[current_ws].winlist, win, entry);
 514                         free(win);
 515                         ws[current_ws].winno--;
 516                         break;
 517                 }
 518         }
 519
 520         stack();
 521 }
 522
 523 void
 524 enternotify(XEvent *e)
 525 {
 526         XCrossingEvent          *ev = &e->xcrossing;
 527         struct ws_win           *win;
 528
 529         DNPRINTF(SWM_D_EVENT, "enternotify: window: %d\n", ev->window);
 530
 531         if((ev->mode != NotifyNormal || ev->detail == NotifyInferior) &&
 532             ev->window != root)
 533                 return;
 534         if (ignore_enter) {
 535                 /* eat event(s) to prevent autofocus */
 536                 ignore_enter--;
 537                 return;
 538         }
 539         TAILQ_FOREACH (win, &ws[current_ws].winlist, entry) {
 540                 if (win->id == ev->window)
 541                         focus_win(win);
 542                 else
 543                         unfocus_win(win);
 544         }
 545 }
 546
 547 void
 548 focusin(XEvent *e)
 549 {
 550         XFocusChangeEvent       *ev = &e->xfocus;
 551
 552         DNPRINTF(SWM_D_EVENT, "focusin: window: %d\n", ev->window);
 553
 554         if (ev->window == root)
 555                 return;
 556
 557         /*
 558          * kill grab for now so that we can cut and paste , this screws up
 559          * click to focus
 560          */
 561         /*
 562         DNPRINTF(SWM_D_EVENT, "focusin: window: %d grabbing\n", ev->window);
 563         XGrabButton(display, Button1, AnyModifier, ev->window, False,
 564             ButtonPress, GrabModeAsync, GrabModeSync, None, None);
 565         */
 566 }
 567
 568 void
 569 mappingnotify(XEvent *e)
 570 {
 571         XMappingEvent           *ev = &e->xmapping;
 572
 573         DNPRINTF(SWM_D_EVENT, "mappingnotify: window: %d\n", ev->window);
 574
 575         XRefreshKeyboardMapping(ev);
 576         if(ev->request == MappingKeyboard)
 577                 grabkeys();
 578 }
 579
 580 void
 581 maprequest(XEvent *e)
 582 {
 583         XMapRequestEvent        *ev = &e->xmaprequest;
 584
 585         DNPRINTF(SWM_D_EVENT, "maprequest: window: %d\n", ev->window);
 586 }
 587
 588 void
 589 propertynotify(XEvent *e)
 590 {
 591         XPropertyEvent          *ev = &e->xproperty;
 592
 593         DNPRINTF(SWM_D_EVENT, "propertynotify: window: %d\n", ev->window);
 594 }
 595
 596 void
 597 unmapnotify(XEvent *e)
 598 {
 599         XUnmapEvent             *ev = &e->xunmap;
 600
 601         DNPRINTF(SWM_D_EVENT, "unmapnotify: window: %d\n", ev->window);
 602 }
 603
 604 void                    (*handler[LASTEvent])(XEvent *) = {
 605                                 [Expose] = expose,
 606                                 [KeyPress] = keypress,
 607                                 [ButtonPress] = buttonpress,
 608                                 [ConfigureRequest] = configurerequest,
 609                                 [ConfigureNotify] = configurenotify,
 610                                 [DestroyNotify] = destroynotify,
 611                                 [EnterNotify] = enternotify,
 612                                 [FocusIn] = focusin,
 613                                 [MappingNotify] = mappingnotify,
 614                                 [MapRequest] = maprequest,
 615                                 [PropertyNotify] = propertynotify,
 616                                 [UnmapNotify] = unmapnotify,
 617 };
 618
 619 int
 620 xerror_start(Display *d, XErrorEvent *ee)
 621 {
 622         other_wm = 1;
 623         return (-1);
 624 }
 625
 626 int
 627 xerror(Display *d, XErrorEvent *ee)
 628 {
 629         fprintf(stderr, "error: %p %p\n", display, ee);
 630
 631         return (-1);
 632 }
 633
 634 int
 635 active_wm(void)
 636 {
 637         other_wm = 0;
 638         xerrorxlib = XSetErrorHandler(xerror_start);
 639
 640         /* this causes an error if some other window manager is running */
 641         XSelectInput(display, DefaultRootWindow(display),
 642             SubstructureRedirectMask);
 643         XSync(display, False);
 644         if(other_wm)
 645                 return (1);
 646
 647         XSetErrorHandler(xerror);
 648         XSync(display, False);
 649         return (0);
 650 }
 651
 652 int
 653 main(int argc, char *argv[])
 654 {
 655         XEvent                  e;
 656         int                     i;
 657
 658         fprintf(stderr, "Welcome to scrotwm V%s\n", SWM_VERSION);
 659         if(!setlocale(LC_CTYPE, "") || !XSupportsLocale())
 660                 warnx("no locale support");
 661
 662         if(!(display = XOpenDisplay(0)))
 663                 errx(1, "can not open display");
 664
 665         if (active_wm())
 666                 errx(1, "other wm running");
 667
 668         screen = DefaultScreen(display);
 669         root = RootWindow(display, screen);
 670         width = DisplayWidth(display, screen) - 2;
 671         height = DisplayHeight(display, screen) - 2;
 672
 673         /* make work space 1 active */
 674         ws[0].visible = 1;
 675         ws[0].focus = NULL;
 676         ws[0].winno = 0;
 677         TAILQ_INIT(&ws[0].winlist);
 678         for (i = 1; i < SWM_WS_MAX; i++) {
 679                 ws[i].visible = 0;
 680                 ws[i].focus = NULL;
 681                 ws[i].winno = 0;
 682                 TAILQ_INIT(&ws[i].winlist);
 683         }
 684
 685         XSelectInput(display, root, SubstructureRedirectMask |
 686             SubstructureNotifyMask | ButtonPressMask | KeyPressMask |
 687             EnterWindowMask | LeaveWindowMask | StructureNotifyMask |
 688             FocusChangeMask | PropertyChangeMask);
 689
 690         grabkeys();
 691
 692         while (running) {
 693                 XNextEvent(display, &e);
 694                 if (handler[e.type])
 695                         handler[e.type](&e);
 696         }
 697
 698         XCloseDisplay(display);
 699
 700         return (0);
 701 }