dwm.c

   1 /* See LICENSE file for copyright and license details.
   2  *
   3  * dynamic window manager is designed like any other X client as well. It is
   4  * driven through handling X events. In contrast to other X clients, a window
   5  * manager selects for SubstructureRedirectMask on the root window, to receive
   6  * events about window (dis-)appearance. Only one X connection at a time is
   7  * allowed to select for this event mask.
   8  *
   9  * The event handlers of dwm are organized in an array which is accessed
  10  * whenever a new event has been fetched. This allows event dispatching
  11  * in O(1) time.
  12  *
  13  * Each child of the root window is called a client, except windows which have
  14  * set the override_redirect flag. Clients are organized in a linked client
  15  * list on each monitor, the focus history is remembered through a stack list
  16  * on each monitor. Each client contains a bit array to indicate the tags of a
  17  * client.
  18  *
  19  * Keys and tagging rules are organized as arrays and defined in config.h.
  20  *
  21  * To understand everything else, start reading main().
  22  */
  23 #include <errno.h>
  24 #include <locale.h>
  25 #include <signal.h>
  26 #include <stdarg.h>
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #include <unistd.h>
  31 #include <sys/types.h>
  32 #include <sys/wait.h>
  33 #include <X11/cursorfont.h>
  34 #include <X11/keysym.h>
  35 #include <X11/Xatom.h>
  36 #include <X11/Xlib.h>
  37 #include <X11/Xproto.h>
  38 #include <X11/Xutil.h>
  39 #ifdef XINERAMA
  40 #include <X11/extensions/Xinerama.h>
  41 #endif /* XINERAMA */
  42 #include <X11/Xft/Xft.h>
  43 #include <X11/Xlib-xcb.h>
  44 #include <xcb/res.h>
  45 #ifdef __OpenBSD__
  46 #include <sys/sysctl.h>
  47 #include <kvm.h>
  48 #endif /* __OpenBSD */
  49
  50 #include "drw.h"
  51 #include "util.h"
  52
  53 /* macros */
  54 #define BUTTONMASK              (ButtonPressMask|ButtonReleaseMask)
  55 #define CLEANMASK(mask)         (mask & ~(numlockmask|LockMask) & (ShiftMask|ControlMask|Mod1Mask|Mod2Mask|Mod3Mask|Mod4Mask|Mod5Mask))
  56 #define INTERSECT(x,y,w,h,m)    (MAX(0, MIN((x)+(w),(m)->wx+(m)->ww) - MAX((x),(m)->wx)) \
  57                                * MAX(0, MIN((y)+(h),(m)->wy+(m)->wh) - MAX((y),(m)->wy)))
  58 #define ISVISIBLE(C)            ((C->tags & C->mon->tagset[C->mon->seltags]))
  59 #define LENGTH(X)               (sizeof X / sizeof X[0])
  60 #define MOUSEMASK               (BUTTONMASK|PointerMotionMask)
  61 #define WIDTH(X)                ((X)->w + 2 * (X)->bw)
  62 #define HEIGHT(X)               ((X)->h + 2 * (X)->bw)
  63 #define TAGMASK                 ((1 << LENGTH(tags)) - 1)
  64 #define TEXTW(X)                (drw_fontset_getwidth(drw, (X)) + lrpad)
  65
  66 #define OPAQUE                  0xffU
  67
  68 /* enums */
  69 enum { CurNormal, CurResize, CurMove, CurLast }; /* cursor */
  70 enum { SchemeNorm, SchemeSel }; /* color schemes */
  71 enum { NetSupported, NetWMName, NetWMState, NetWMCheck,
  72        NetWMFullscreen, NetActiveWindow, NetWMWindowType,
  73        NetWMWindowTypeDialog, NetClientList, NetLast }; /* EWMH atoms */
  74 enum { WMProtocols, WMDelete, WMState, WMTakeFocus, WMLast }; /* default atoms */
  75 enum { ClkTagBar, ClkLtSymbol, ClkStatusText, ClkWinTitle,
  76        ClkClientWin, ClkRootWin, ClkLast }; /* clicks */
  77
  78 typedef union {
  79         int i;
  80         unsigned int ui;
  81         float f;
  82         const void *v;
  83 } Arg;
  84
  85 typedef struct {
  86         unsigned int click;
  87         unsigned int mask;
  88         unsigned int button;
  89         void (*func)(const Arg *arg);
  90         const Arg arg;
  91 } Button;
  92
  93 typedef struct Monitor Monitor;
  94 typedef struct Client Client;
  95 struct Client {
  96         char name[256];
  97         float mina, maxa;
  98         int x, y, w, h;
  99         int oldx, oldy, oldw, oldh;
 100         int basew, baseh, incw, inch, maxw, maxh, minw, minh;
 101         int bw, oldbw;
 102         unsigned int tags;
 103         int isfixed, isfloating, isurgent, neverfocus, oldstate, isfullscreen, isterminal, noswallow;
 104         pid_t pid;
 105         Client *next;
 106         Client *snext;
 107         Client *swallowing;
 108         Monitor *mon;
 109         Window win;
 110 };
 111
 112 typedef struct {
 113         unsigned int mod;
 114         KeySym keysym;
 115         void (*func)(const Arg *);
 116         const Arg arg;
 117 } Key;
 118
 119 typedef struct {
 120         const char *symbol;
 121         void (*arrange)(Monitor *);
 122 } Layout;
 123
 124 struct Monitor {
 125         char ltsymbol[16];
 126         float mfact;
 127         int nmaster;
 128         int num;
 129         int by;               /* bar geometry */
 130         int mx, my, mw, mh;   /* screen size */
 131         int wx, wy, ww, wh;   /* window area  */
 132         int gappx;            /* gaps between windows */
 133         unsigned int seltags;
 134         unsigned int sellt;
 135         unsigned int tagset[2];
 136         int showbar;
 137         int topbar;
 138         Client *clients;
 139         Client *sel;
 140         Client *stack;
 141         Monitor *next;
 142         Window barwin;
 143         const Layout *lt[2];
 144 };
 145
 146 typedef struct {
 147         const char *class;
 148         const char *instance;
 149         const char *title;
 150         unsigned int tags;
 151         int isfloating;
 152         int isterminal;
 153         int noswallow;
 154         int monitor;
 155 } Rule;
 156
 157 /* function declarations */
 158 static void applyrules(Client *c);
 159 static int applysizehints(Client *c, int *x, int *y, int *w, int *h, int interact);
 160 static void arrange(Monitor *m);
 161 static void arrangemon(Monitor *m);
 162 static void attach(Client *c);
 163 static void attachstack(Client *c);
 164 static void buttonpress(XEvent *e);
 165 static void checkotherwm(void);
 166 static void cleanup(void);
 167 static void cleanupmon(Monitor *mon);
 168 static void clientmessage(XEvent *e);
 169 static void configure(Client *c);
 170 static void configurenotify(XEvent *e);
 171 static void configurerequest(XEvent *e);
 172 static Monitor *createmon(void);
 173 static void destroynotify(XEvent *e);
 174 static void detach(Client *c);
 175 static void detachstack(Client *c);
 176 static Monitor *dirtomon(int dir);
 177 static void drawbar(Monitor *m);
 178 static void drawbars(void);
 179 static void enternotify(XEvent *e);
 180 static void expose(XEvent *e);
 181 static void focus(Client *c);
 182 static void focusin(XEvent *e);
 183 static void focusmon(const Arg *arg);
 184 static void focusstack(const Arg *arg);
 185 static Atom getatomprop(Client *c, Atom prop);
 186 static int getrootptr(int *x, int *y);
 187 static long getstate(Window w);
 188 static int gettextprop(Window w, Atom atom, char *text, unsigned int size);
 189 static void grabbuttons(Client *c, int focused);
 190 static void grabkeys(void);
 191 static void incnmaster(const Arg *arg);
 192 static void keypress(XEvent *e);
 193 static void killclient(const Arg *arg);
 194 static void manage(Window w, XWindowAttributes *wa);
 195 static void mappingnotify(XEvent *e);
 196 static void maprequest(XEvent *e);
 197 static void monocle(Monitor *m);
 198 static void motionnotify(XEvent *e);
 199 static void movemouse(const Arg *arg);
 200 static Client *nexttiled(Client *c);
 201 static void pop(Client *);
 202 static void propertynotify(XEvent *e);
 203 static void quit(const Arg *arg);
 204 static Monitor *recttomon(int x, int y, int w, int h);
 205 static void resize(Client *c, int x, int y, int w, int h, int interact);
 206 static void resizeclient(Client *c, int x, int y, int w, int h);
 207 static void resizemouse(const Arg *arg);
 208 static void restack(Monitor *m);
 209 static void run(void);
 210 static void scan(void);
 211 static int sendevent(Client *c, Atom proto);
 212 static void sendmon(Client *c, Monitor *m);
 213 static void setclientstate(Client *c, long state);
 214 static void setfocus(Client *c);
 215 static void setfullscreen(Client *c, int fullscreen);
 216 static void setgaps(const Arg *arg);
 217 static void setlayout(const Arg *arg);
 218 static void setmfact(const Arg *arg);
 219 static void setup(void);
 220 static void seturgent(Client *c, int urg);
 221 static void showhide(Client *c);
 222 static void sigchld(int unused);
 223 static void sighup(int unused);
 224 static void sigterm(int unused);
 225 static void spawn(const Arg *arg);
 226 static void tag(const Arg *arg);
 227 static void tagmon(const Arg *arg);
 228 static void tile(Monitor *);
 229 static void togglebar(const Arg *arg);
 230 static void togglefloating(const Arg *arg);
 231 static void togglefullscr(const Arg *arg);
 232 static void toggletag(const Arg *arg);
 233 static void toggleview(const Arg *arg);
 234 static void unfocus(Client *c, int setfocus);
 235 static void unmanage(Client *c, int destroyed);
 236 static void unmapnotify(XEvent *e);
 237 static void updatebarpos(Monitor *m);
 238 static void updatebars(void);
 239 static void updateclientlist(void);
 240 static int updategeom(void);
 241 static void updatenumlockmask(void);
 242 static void updatesizehints(Client *c);
 243 static void updatestatus(void);
 244 static void updatetitle(Client *c);
 245 static void updatewindowtype(Client *c);
 246 static void updatewmhints(Client *c);
 247 static void view(const Arg *arg);
 248 static Client *wintoclient(Window w);
 249 static Monitor *wintomon(Window w);
 250 static int xerror(Display *dpy, XErrorEvent *ee);
 251 static int xerrordummy(Display *dpy, XErrorEvent *ee);
 252 static int xerrorstart(Display *dpy, XErrorEvent *ee);
 253 static void xinitvisual();
 254 static void zoom(const Arg *arg);
 255
 256 static pid_t getparentprocess(pid_t p);
 257 static int isdescprocess(pid_t p, pid_t c);
 258 static Client *swallowingclient(Window w);
 259 static Client *termforwin(const Client *c);
 260 static pid_t winpid(Window w);
 261
 262 /* variables */
 263 static const char broken[] = "broken";
 264 static char stext[256];
 265 static int screen;
 266 static int sw, sh;           /* X display screen geometry width, height */
 267 static int bh, blw = 0;      /* bar geometry */
 268 static int lrpad;            /* sum of left and right padding for text */
 269 static int (*xerrorxlib)(Display *, XErrorEvent *);
 270 static unsigned int numlockmask = 0;
 271 static void (*handler[LASTEvent]) (XEvent *) = {
 272         [ButtonPress] = buttonpress,
 273         [ClientMessage] = clientmessage,
 274         [ConfigureRequest] = configurerequest,
 275         [ConfigureNotify] = configurenotify,
 276         [DestroyNotify] = destroynotify,
 277         [EnterNotify] = enternotify,
 278         [Expose] = expose,
 279         [FocusIn] = focusin,
 280         [KeyPress] = keypress,
 281         [MappingNotify] = mappingnotify,
 282         [MapRequest] = maprequest,
 283         [MotionNotify] = motionnotify,
 284         [PropertyNotify] = propertynotify,
 285         [UnmapNotify] = unmapnotify
 286 };
 287 static Atom wmatom[WMLast], netatom[NetLast];
 288 static int restart = 0;
 289 static int running = 1;
 290 static Cur *cursor[CurLast];
 291 static Clr **scheme;
 292 static Display *dpy;
 293 static Drw *drw;
 294 static Monitor *mons, *selmon;
 295 static Window root, wmcheckwin;
 296
 297 static xcb_connection_t *xcon;
 298
 299 static int useargb = 0;
 300 static Visual *visual;
 301 static int depth;
 302 static Colormap cmap;
 303
 304 /* configuration, allows nested code to access above variables */
 305 #include "config.h"
 306
 307 /* compile-time check if all tags fit into an unsigned int bit array. */
 308 struct NumTags { char limitexceeded[LENGTH(tags) > 31 ? -1 : 1]; };
 309
 310 /* function implementations */
 311 void
 312 applyrules(Client *c)
 313 {
 314         const char *class, *instance;
 315         unsigned int i;
 316         const Rule *r;
 317         Monitor *m;
 318         XClassHint ch = { NULL, NULL };
 319
 320         /* rule matching */
 321         c->isfloating = 0;
 322         c->tags = 0;
 323         XGetClassHint(dpy, c->win, &ch);
 324         class    = ch.res_class ? ch.res_class : broken;
 325         instance = ch.res_name  ? ch.res_name  : broken;
 326
 327         for (i = 0; i < LENGTH(rules); i++) {
 328                 r = &rules[i];
 329                 if ((!r->title || strstr(c->name, r->title))
 330                 && (!r->class || strstr(class, r->class))
 331                 && (!r->instance || strstr(instance, r->instance)))
 332                 {
 333                         c->isterminal = r->isterminal;
 334                         c->noswallow  = r->noswallow;
 335                         c->isfloating = r->isfloating;
 336                         c->tags |= r->tags;
 337                         for (m = mons; m && m->num != r->monitor; m = m->next);
 338                         if (m)
 339                                 c->mon = m;
 340                 }
 341         }
 342         if (ch.res_class)
 343                 XFree(ch.res_class);
 344         if (ch.res_name)
 345                 XFree(ch.res_name);
 346         c->tags = c->tags & TAGMASK ? c->tags & TAGMASK : c->mon->tagset[c->mon->seltags];
 347 }
 348
 349 int
 350 applysizehints(Client *c, int *x, int *y, int *w, int *h, int interact)
 351 {
 352         int baseismin;
 353         Monitor *m = c->mon;
 354
 355         /* set minimum possible */
 356         *w = MAX(1, *w);
 357         *h = MAX(1, *h);
 358         if (interact) {
 359                 if (*x > sw)
 360                         *x = sw - WIDTH(c);
 361                 if (*y > sh)
 362                         *y = sh - HEIGHT(c);
 363                 if (*x + *w + 2 * c->bw < 0)
 364                         *x = 0;
 365                 if (*y + *h + 2 * c->bw < 0)
 366                         *y = 0;
 367         } else {
 368                 if (*x >= m->wx + m->ww)
 369                         *x = m->wx + m->ww - WIDTH(c);
 370                 if (*y >= m->wy + m->wh)
 371                         *y = m->wy + m->wh - HEIGHT(c);
 372                 if (*x + *w + 2 * c->bw <= m->wx)
 373                         *x = m->wx;
 374                 if (*y + *h + 2 * c->bw <= m->wy)
 375                         *y = m->wy;
 376         }
 377         if (*h < bh)
 378                 *h = bh;
 379         if (*w < bh)
 380                 *w = bh;
 381         if (resizehints || c->isfloating || !c->mon->lt[c->mon->sellt]->arrange) {
 382                 /* see last two sentences in ICCCM 4.1.2.3 */
 383                 baseismin = c->basew == c->minw && c->baseh == c->minh;
 384                 if (!baseismin) { /* temporarily remove base dimensions */
 385                         *w -= c->basew;
 386                         *h -= c->baseh;
 387                 }
 388                 /* adjust for aspect limits */
 389                 if (c->mina > 0 && c->maxa > 0) {
 390                         if (c->maxa < (float)*w / *h)
 391                                 *w = *h * c->maxa + 0.5;
 392                         else if (c->mina < (float)*h / *w)
 393                                 *h = *w * c->mina + 0.5;
 394                 }
 395                 if (baseismin) { /* increment calculation requires this */
 396                         *w -= c->basew;
 397                         *h -= c->baseh;
 398                 }
 399                 /* adjust for increment value */
 400                 if (c->incw)
 401                         *w -= *w % c->incw;
 402                 if (c->inch)
 403                         *h -= *h % c->inch;
 404                 /* restore base dimensions */
 405                 *w = MAX(*w + c->basew, c->minw);
 406                 *h = MAX(*h + c->baseh, c->minh);
 407                 if (c->maxw)
 408                         *w = MIN(*w, c->maxw);
 409                 if (c->maxh)
 410                         *h = MIN(*h, c->maxh);
 411         }
 412         return *x != c->x || *y != c->y || *w != c->w || *h != c->h;
 413 }
 414
 415 void
 416 arrange(Monitor *m)
 417 {
 418         if (m)
 419                 showhide(m->stack);
 420         else for (m = mons; m; m = m->next)
 421                 showhide(m->stack);
 422         if (m) {
 423                 arrangemon(m);
 424                 restack(m);
 425         } else for (m = mons; m; m = m->next)
 426                 arrangemon(m);
 427 }
 428
 429 void
 430 arrangemon(Monitor *m)
 431 {
 432         strncpy(m->ltsymbol, m->lt[m->sellt]->symbol, sizeof m->ltsymbol);
 433         if (m->lt[m->sellt]->arrange)
 434                 m->lt[m->sellt]->arrange(m);
 435 }
 436
 437 void
 438 attach(Client *c)
 439 {
 440         c->next = c->mon->clients;
 441         c->mon->clients = c;
 442 }
 443
 444 void
 445 attachstack(Client *c)
 446 {
 447         c->snext = c->mon->stack;
 448         c->mon->stack = c;
 449 }
 450
 451 void
 452 swallow(Client *p, Client *c)
 453 {
 454
 455         if (c->noswallow || c->isterminal)
 456                 return;
 457         if (c->noswallow && !swallowfloating && c->isfloating)
 458                 return;
 459
 460         detach(c);
 461         detachstack(c);
 462
 463         setclientstate(c, WithdrawnState);
 464         XUnmapWindow(dpy, p->win);
 465
 466         p->swallowing = c;
 467         c->mon = p->mon;
 468
 469         Window w = p->win;
 470         p->win = c->win;
 471         c->win = w;
 472         updatetitle(p);
 473         XMoveResizeWindow(dpy, p->win, p->x, p->y, p->w, p->h);
 474         arrange(p->mon);
 475         configure(p);
 476         updateclientlist();
 477 }
 478
 479 void
 480 unswallow(Client *c)
 481 {
 482         c->win = c->swallowing->win;
 483
 484         free(c->swallowing);
 485         c->swallowing = NULL;
 486
 487         /* unfullscreen the client */
 488         setfullscreen(c, 0);
 489         updatetitle(c);
 490         arrange(c->mon);
 491         XMapWindow(dpy, c->win);
 492         XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
 493         setclientstate(c, NormalState);
 494         focus(NULL);
 495         arrange(c->mon);
 496 }
 497
 498 void
 499 buttonpress(XEvent *e)
 500 {
 501         unsigned int i, x, click;
 502         Arg arg = {0};
 503         Client *c;
 504         Monitor *m;
 505         XButtonPressedEvent *ev = &e->xbutton;
 506
 507         click = ClkRootWin;
 508         /* focus monitor if necessary */
 509         if ((m = wintomon(ev->window)) && m != selmon) {
 510                 unfocus(selmon->sel, 1);
 511                 selmon = m;
 512                 focus(NULL);
 513         }
 514         if (ev->window == selmon->barwin) {
 515                 i = x = 0;
 516                 do
 517                         x += TEXTW(tags[i]);
 518                 while (ev->x >= x && ++i < LENGTH(tags));
 519                 if (i < LENGTH(tags)) {
 520                         click = ClkTagBar;
 521                         arg.ui = 1 << i;
 522                 } else if (ev->x < x + blw)
 523                         click = ClkLtSymbol;
 524                 else if (ev->x > selmon->ww - (int)TEXTW(stext))
 525                         click = ClkStatusText;
 526                 else
 527                         click = ClkWinTitle;
 528         } else if ((c = wintoclient(ev->window))) {
 529                 focus(c);
 530                 restack(selmon);
 531                 XAllowEvents(dpy, ReplayPointer, CurrentTime);
 532                 click = ClkClientWin;
 533         }
 534         for (i = 0; i < LENGTH(buttons); i++)
 535                 if (click == buttons[i].click && buttons[i].func && buttons[i].button == ev->button
 536                 && CLEANMASK(buttons[i].mask) == CLEANMASK(ev->state))
 537                         buttons[i].func(click == ClkTagBar && buttons[i].arg.i == 0 ? &arg : &buttons[i].arg);
 538 }
 539
 540 void
 541 checkotherwm(void)
 542 {
 543         xerrorxlib = XSetErrorHandler(xerrorstart);
 544         /* this causes an error if some other window manager is running */
 545         XSelectInput(dpy, DefaultRootWindow(dpy), SubstructureRedirectMask);
 546         XSync(dpy, False);
 547         XSetErrorHandler(xerror);
 548         XSync(dpy, False);
 549 }
 550
 551 void
 552 cleanup(void)
 553 {
 554         Arg a = {.ui = ~0};
 555         Layout foo = { "", NULL };
 556         Monitor *m;
 557         size_t i;
 558
 559         view(&a);
 560         selmon->lt[selmon->sellt] = &foo;
 561         for (m = mons; m; m = m->next)
 562                 while (m->stack)
 563                         unmanage(m->stack, 0);
 564         XUngrabKey(dpy, AnyKey, AnyModifier, root);
 565         while (mons)
 566                 cleanupmon(mons);
 567         for (i = 0; i < CurLast; i++)
 568                 drw_cur_free(drw, cursor[i]);
 569         for (i = 0; i < LENGTH(colors); i++)
 570                 free(scheme[i]);
 571         free(scheme);
 572         XDestroyWindow(dpy, wmcheckwin);
 573         drw_free(drw);
 574         XSync(dpy, False);
 575         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 576         XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
 577 }
 578
 579 void
 580 cleanupmon(Monitor *mon)
 581 {
 582         Monitor *m;
 583
 584         if (mon == mons)
 585                 mons = mons->next;
 586         else {
 587                 for (m = mons; m && m->next != mon; m = m->next);
 588                 m->next = mon->next;
 589         }
 590         XUnmapWindow(dpy, mon->barwin);
 591         XDestroyWindow(dpy, mon->barwin);
 592         free(mon);
 593 }
 594
 595 void
 596 clientmessage(XEvent *e)
 597 {
 598         XClientMessageEvent *cme = &e->xclient;
 599         Client *c = wintoclient(cme->window);
 600
 601         if (!c)
 602                 return;
 603         if (cme->message_type == netatom[NetWMState]) {
 604                 if (cme->data.l[1] == netatom[NetWMFullscreen]
 605                 || cme->data.l[2] == netatom[NetWMFullscreen])
 606                         setfullscreen(c, (cme->data.l[0] == 1 /* _NET_WM_STATE_ADD    */
 607                                 || (cme->data.l[0] == 2 /* _NET_WM_STATE_TOGGLE */ && !c->isfullscreen)));
 608         } else if (cme->message_type == netatom[NetActiveWindow]) {
 609                 if (c != selmon->sel && !c->isurgent)
 610                         seturgent(c, 1);
 611         }
 612 }
 613
 614 void
 615 configure(Client *c)
 616 {
 617         XConfigureEvent ce;
 618
 619         ce.type = ConfigureNotify;
 620         ce.display = dpy;
 621         ce.event = c->win;
 622         ce.window = c->win;
 623         ce.x = c->x;
 624         ce.y = c->y;
 625         ce.width = c->w;
 626         ce.height = c->h;
 627         ce.border_width = c->bw;
 628         ce.above = None;
 629         ce.override_redirect = False;
 630         XSendEvent(dpy, c->win, False, StructureNotifyMask, (XEvent *)&ce);
 631 }
 632
 633 void
 634 configurenotify(XEvent *e)
 635 {
 636         Monitor *m;
 637         Client *c;
 638         XConfigureEvent *ev = &e->xconfigure;
 639         int dirty;
 640
 641         /* TODO: updategeom handling sucks, needs to be simplified */
 642         if (ev->window == root) {
 643                 dirty = (sw != ev->width || sh != ev->height);
 644                 sw = ev->width;
 645                 sh = ev->height;
 646                 if (updategeom() || dirty) {
 647                         drw_resize(drw, sw, bh);
 648                         updatebars();
 649                         for (m = mons; m; m = m->next) {
 650                                 for (c = m->clients; c; c = c->next)
 651                                         if (c->isfullscreen)
 652                                                 resizeclient(c, m->mx, m->my, m->mw, m->mh);
 653                                 XMoveResizeWindow(dpy, m->barwin, m->wx, m->by, m->ww, bh);
 654                         }
 655                         focus(NULL);
 656                         arrange(NULL);
 657                 }
 658         }
 659 }
 660
 661 void
 662 configurerequest(XEvent *e)
 663 {
 664         Client *c;
 665         Monitor *m;
 666         XConfigureRequestEvent *ev = &e->xconfigurerequest;
 667         XWindowChanges wc;
 668
 669         if ((c = wintoclient(ev->window))) {
 670                 if (ev->value_mask & CWBorderWidth)
 671                         c->bw = ev->border_width;
 672                 else if (c->isfloating || !selmon->lt[selmon->sellt]->arrange) {
 673                         m = c->mon;
 674                         if (ev->value_mask & CWX) {
 675                                 c->oldx = c->x;
 676                                 c->x = m->mx + ev->x;
 677                         }
 678                         if (ev->value_mask & CWY) {
 679                                 c->oldy = c->y;
 680                                 c->y = m->my + ev->y;
 681                         }
 682                         if (ev->value_mask & CWWidth) {
 683                                 c->oldw = c->w;
 684                                 c->w = ev->width;
 685                         }
 686                         if (ev->value_mask & CWHeight) {
 687                                 c->oldh = c->h;
 688                                 c->h = ev->height;
 689                         }
 690                         if ((c->x + c->w) > m->mx + m->mw && c->isfloating)
 691                                 c->x = m->mx + (m->mw / 2 - WIDTH(c) / 2); /* center in x direction */
 692                         if ((c->y + c->h) > m->my + m->mh && c->isfloating)
 693                                 c->y = m->my + (m->mh / 2 - HEIGHT(c) / 2); /* center in y direction */
 694                         if ((ev->value_mask & (CWX|CWY)) && !(ev->value_mask & (CWWidth|CWHeight)))
 695                                 configure(c);
 696                         if (ISVISIBLE(c))
 697                                 XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
 698                 } else
 699                         configure(c);
 700         } else {
 701                 wc.x = ev->x;
 702                 wc.y = ev->y;
 703                 wc.width = ev->width;
 704                 wc.height = ev->height;
 705                 wc.border_width = ev->border_width;
 706                 wc.sibling = ev->above;
 707                 wc.stack_mode = ev->detail;
 708                 XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
 709         }
 710         XSync(dpy, False);
 711 }
 712
 713 Monitor *
 714 createmon(void)
 715 {
 716         Monitor *m;
 717
 718         m = ecalloc(1, sizeof(Monitor));
 719         m->tagset[0] = m->tagset[1] = 1;
 720         m->mfact = mfact;
 721         m->nmaster = nmaster;
 722         m->showbar = showbar;
 723         m->topbar = topbar;
 724         m->gappx = gappx;
 725         m->lt[0] = &layouts[0];
 726         m->lt[1] = &layouts[1 % LENGTH(layouts)];
 727         strncpy(m->ltsymbol, layouts[0].symbol, sizeof m->ltsymbol);
 728         return m;
 729 }
 730
 731 void
 732 destroynotify(XEvent *e)
 733 {
 734         Client *c;
 735         XDestroyWindowEvent *ev = &e->xdestroywindow;
 736
 737         if ((c = wintoclient(ev->window)))
 738                 unmanage(c, 1);
 739
 740         else if ((c = swallowingclient(ev->window)))
 741                 unmanage(c->swallowing, 1);
 742 }
 743
 744 void
 745 detach(Client *c)
 746 {
 747         Client **tc;
 748
 749         for (tc = &c->mon->clients; *tc && *tc != c; tc = &(*tc)->next);
 750         *tc = c->next;
 751 }
 752
 753 void
 754 detachstack(Client *c)
 755 {
 756         Client **tc, *t;
 757
 758         for (tc = &c->mon->stack; *tc && *tc != c; tc = &(*tc)->snext);
 759         *tc = c->snext;
 760
 761         if (c == c->mon->sel) {
 762                 for (t = c->mon->stack; t && !ISVISIBLE(t); t = t->snext);
 763                 c->mon->sel = t;
 764         }
 765 }
 766
 767 Monitor *
 768 dirtomon(int dir)
 769 {
 770         Monitor *m = NULL;
 771
 772         if (dir > 0) {
 773                 if (!(m = selmon->next))
 774                         m = mons;
 775         } else if (selmon == mons)
 776                 for (m = mons; m->next; m = m->next);
 777         else
 778                 for (m = mons; m->next != selmon; m = m->next);
 779         return m;
 780 }
 781
 782 void
 783 drawbar(Monitor *m)
 784 {
 785         int x, w, tw = 0;
 786         int boxs = drw->fonts->h / 9;
 787         int boxw = drw->fonts->h / 6 + 2;
 788         unsigned int i, occ = 0, urg = 0;
 789         Client *c;
 790
 791         if (!m->showbar)
 792                 return;
 793
 794         /* draw status first so it can be overdrawn by tags later */
 795         if (m == selmon) { /* status is only drawn on selected monitor */
 796                 drw_setscheme(drw, scheme[SchemeNorm]);
 797                 tw = TEXTW(stext) - lrpad + 2; /* 2px right padding */
 798                 drw_text(drw, m->ww - tw, 0, tw, bh, 0, stext, 0);
 799         }
 800
 801         for (c = m->clients; c; c = c->next) {
 802                 occ |= c->tags;
 803                 if (c->isurgent)
 804                         urg |= c->tags;
 805         }
 806         x = 0;
 807         for (i = 0; i < LENGTH(tags); i++) {
 808                 w = TEXTW(tags[i]);
 809                 drw_setscheme(drw, scheme[m->tagset[m->seltags] & 1 << i ? SchemeSel : SchemeNorm]);
 810                 drw_text(drw, x, 0, w, bh, lrpad / 2, tags[i], urg & 1 << i);
 811                 if (occ & 1 << i)
 812                         drw_rect(drw, x + boxs, boxs, boxw, boxw,
 813                                 m == selmon && selmon->sel && selmon->sel->tags & 1 << i,
 814                                 urg & 1 << i);
 815                 x += w;
 816         }
 817         w = blw = TEXTW(m->ltsymbol);
 818         drw_setscheme(drw, scheme[SchemeNorm]);
 819         x = drw_text(drw, x, 0, w, bh, lrpad / 2, m->ltsymbol, 0);
 820
 821         if ((w = m->ww - tw - x) > bh) {
 822                 if (m->sel) {
 823                         drw_setscheme(drw, scheme[m == selmon ? SchemeSel : SchemeNorm]);
 824                         drw_text(drw, x, 0, w, bh, lrpad / 2, m->sel->name, 0);
 825                         if (m->sel->isfloating)
 826                                 drw_rect(drw, x + boxs, boxs, boxw, boxw, m->sel->isfixed, 0);
 827                 } else {
 828                         drw_setscheme(drw, scheme[SchemeNorm]);
 829                         drw_rect(drw, x, 0, w, bh, 1, 1);
 830                 }
 831         }
 832         drw_map(drw, m->barwin, 0, 0, m->ww, bh);
 833 }
 834
 835 void
 836 drawbars(void)
 837 {
 838         Monitor *m;
 839
 840         for (m = mons; m; m = m->next)
 841                 drawbar(m);
 842 }
 843
 844 void
 845 enternotify(XEvent *e)
 846 {
 847         Client *c;
 848         Monitor *m;
 849         XCrossingEvent *ev = &e->xcrossing;
 850
 851         if ((ev->mode != NotifyNormal || ev->detail == NotifyInferior) && ev->window != root)
 852                 return;
 853         c = wintoclient(ev->window);
 854         m = c ? c->mon : wintomon(ev->window);
 855         if (m != selmon) {
 856                 unfocus(selmon->sel, 1);
 857                 selmon = m;
 858         } else if (!c || c == selmon->sel)
 859                 return;
 860         focus(c);
 861 }
 862
 863 void
 864 expose(XEvent *e)
 865 {
 866         Monitor *m;
 867         XExposeEvent *ev = &e->xexpose;
 868
 869         if (ev->count == 0 && (m = wintomon(ev->window)))
 870                 drawbar(m);
 871 }
 872
 873 void
 874 focus(Client *c)
 875 {
 876         if (!c || !ISVISIBLE(c))
 877                 for (c = selmon->stack; c && !ISVISIBLE(c); c = c->snext);
 878         if (selmon->sel && selmon->sel != c)
 879                 unfocus(selmon->sel, 0);
 880         if (c) {
 881                 if (c->mon != selmon)
 882                         selmon = c->mon;
 883                 if (c->isurgent)
 884                         seturgent(c, 0);
 885                 detachstack(c);
 886                 attachstack(c);
 887                 grabbuttons(c, 1);
 888                 XSetWindowBorder(dpy, c->win, scheme[SchemeSel][ColBorder].pixel);
 889                 setfocus(c);
 890         } else {
 891                 XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
 892                 XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
 893         }
 894         selmon->sel = c;
 895         drawbars();
 896 }
 897
 898 /* there are some broken focus acquiring clients needing extra handling */
 899 void
 900 focusin(XEvent *e)
 901 {
 902         XFocusChangeEvent *ev = &e->xfocus;
 903
 904         if (selmon->sel && ev->window != selmon->sel->win)
 905                 setfocus(selmon->sel);
 906 }
 907
 908 void
 909 focusmon(const Arg *arg)
 910 {
 911         Monitor *m;
 912
 913         if (!mons->next)
 914                 return;
 915         if ((m = dirtomon(arg->i)) == selmon)
 916                 return;
 917         unfocus(selmon->sel, 0);
 918         selmon = m;
 919         focus(NULL);
 920 }
 921
 922 void
 923 focusstack(const Arg *arg)
 924 {
 925         Client *c = NULL, *i;
 926
 927         if (!selmon->sel || (selmon->sel->isfullscreen && lockfullscreen))
 928                 return;
 929         if (arg->i > 0) {
 930                 for (c = selmon->sel->next; c && !ISVISIBLE(c); c = c->next);
 931                 if (!c)
 932                         for (c = selmon->clients; c && !ISVISIBLE(c); c = c->next);
 933         } else {
 934                 for (i = selmon->clients; i != selmon->sel; i = i->next)
 935                         if (ISVISIBLE(i))
 936                                 c = i;
 937                 if (!c)
 938                         for (; i; i = i->next)
 939                                 if (ISVISIBLE(i))
 940                                         c = i;
 941         }
 942         if (c) {
 943                 focus(c);
 944                 restack(selmon);
 945         }
 946 }
 947
 948 Atom
 949 getatomprop(Client *c, Atom prop)
 950 {
 951         int di;
 952         unsigned long dl;
 953         unsigned char *p = NULL;
 954         Atom da, atom = None;
 955
 956         if (XGetWindowProperty(dpy, c->win, prop, 0L, sizeof atom, False, XA_ATOM,
 957                 &da, &di, &dl, &dl, &p) == Success && p) {
 958                 atom = *(Atom *)p;
 959                 XFree(p);
 960         }
 961         return atom;
 962 }
 963
 964 int
 965 getrootptr(int *x, int *y)
 966 {
 967         int di;
 968         unsigned int dui;
 969         Window dummy;
 970
 971         return XQueryPointer(dpy, root, &dummy, &dummy, x, y, &di, &di, &dui);
 972 }
 973
 974 long
 975 getstate(Window w)
 976 {
 977         int format;
 978         long result = -1;
 979         unsigned char *p = NULL;
 980         unsigned long n, extra;
 981         Atom real;
 982
 983         if (XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
 984                 &real, &format, &n, &extra, (unsigned char **)&p) != Success)
 985                 return -1;
 986         if (n != 0)
 987                 result = *p;
 988         XFree(p);
 989         return result;
 990 }
 991
 992 int
 993 gettextprop(Window w, Atom atom, char *text, unsigned int size)
 994 {
 995         char **list = NULL;
 996         int n;
 997         XTextProperty name;
 998
 999         if (!text || size == 0)
1000                 return 0;
1001         text[0] = '\0';
1002         if (!XGetTextProperty(dpy, w, &name, atom) || !name.nitems)
1003                 return 0;
1004         if (name.encoding == XA_STRING)
1005                 strncpy(text, (char *)name.value, size - 1);
1006         else {
1007                 if (XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success && n > 0 && *list) {
1008                         strncpy(text, *list, size - 1);
1009                         XFreeStringList(list);
1010                 }
1011         }
1012         text[size - 1] = '\0';
1013         XFree(name.value);
1014         return 1;
1015 }
1016
1017 void
1018 grabbuttons(Client *c, int focused)
1019 {
1020         updatenumlockmask();
1021         {
1022                 unsigned int i, j;
1023                 unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
1024                 XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1025                 if (!focused)
1026                         XGrabButton(dpy, AnyButton, AnyModifier, c->win, False,
1027                                 BUTTONMASK, GrabModeSync, GrabModeSync, None, None);
1028                 for (i = 0; i < LENGTH(buttons); i++)
1029                         if (buttons[i].click == ClkClientWin)
1030                                 for (j = 0; j < LENGTH(modifiers); j++)
1031                                         XGrabButton(dpy, buttons[i].button,
1032                                                 buttons[i].mask | modifiers[j],
1033                                                 c->win, False, BUTTONMASK,
1034                                                 GrabModeAsync, GrabModeSync, None, None);
1035         }
1036 }
1037
1038 void
1039 grabkeys(void)
1040 {
1041         updatenumlockmask();
1042         {
1043                 unsigned int i, j;
1044                 unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
1045                 KeyCode code;
1046
1047                 XUngrabKey(dpy, AnyKey, AnyModifier, root);
1048                 for (i = 0; i < LENGTH(keys); i++)
1049                         if ((code = XKeysymToKeycode(dpy, keys[i].keysym)))
1050                                 for (j = 0; j < LENGTH(modifiers); j++)
1051                                         XGrabKey(dpy, code, keys[i].mod | modifiers[j], root,
1052                                                 True, GrabModeAsync, GrabModeAsync);
1053         }
1054 }
1055
1056 void
1057 incnmaster(const Arg *arg)
1058 {
1059         selmon->nmaster = MAX(selmon->nmaster + arg->i, 0);
1060         arrange(selmon);
1061 }
1062
1063 #ifdef XINERAMA
1064 static int
1065 isuniquegeom(XineramaScreenInfo *unique, size_t n, XineramaScreenInfo *info)
1066 {
1067         while (n--)
1068                 if (unique[n].x_org == info->x_org && unique[n].y_org == info->y_org
1069                 && unique[n].width == info->width && unique[n].height == info->height)
1070                         return 0;
1071         return 1;
1072 }
1073 #endif /* XINERAMA */
1074
1075 void
1076 keypress(XEvent *e)
1077 {
1078         unsigned int i;
1079         KeySym keysym;
1080         XKeyEvent *ev;
1081
1082         ev = &e->xkey;
1083         keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
1084         for (i = 0; i < LENGTH(keys); i++)
1085                 if (keysym == keys[i].keysym
1086                 && CLEANMASK(keys[i].mod) == CLEANMASK(ev->state)
1087                 && keys[i].func)
1088                         keys[i].func(&(keys[i].arg));
1089 }
1090
1091 void
1092 killclient(const Arg *arg)
1093 {
1094         if (!selmon->sel)
1095                 return;
1096         if (!sendevent(selmon->sel, wmatom[WMDelete])) {
1097                 XGrabServer(dpy);
1098                 XSetErrorHandler(xerrordummy);
1099                 XSetCloseDownMode(dpy, DestroyAll);
1100                 XKillClient(dpy, selmon->sel->win);
1101                 XSync(dpy, False);
1102                 XSetErrorHandler(xerror);
1103                 XUngrabServer(dpy);
1104         }
1105 }
1106
1107 void
1108 manage(Window w, XWindowAttributes *wa)
1109 {
1110         Client *c, *t = NULL, *term = NULL;
1111         Window trans = None;
1112         XWindowChanges wc;
1113
1114         c = ecalloc(1, sizeof(Client));
1115         c->win = w;
1116         c->pid = winpid(w);
1117         /* geometry */
1118         c->x = c->oldx = wa->x;
1119         c->y = c->oldy = wa->y;
1120         c->w = c->oldw = wa->width;
1121         c->h = c->oldh = wa->height;
1122         c->oldbw = wa->border_width;
1123
1124         updatetitle(c);
1125         if (XGetTransientForHint(dpy, w, &trans) && (t = wintoclient(trans))) {
1126                 c->mon = t->mon;
1127                 c->tags = t->tags;
1128         } else {
1129                 c->mon = selmon;
1130                 applyrules(c);
1131                 term = termforwin(c);
1132         }
1133
1134         if (c->x + WIDTH(c) > c->mon->mx + c->mon->mw)
1135                 c->x = c->mon->mx + c->mon->mw - WIDTH(c);
1136         if (c->y + HEIGHT(c) > c->mon->my + c->mon->mh)
1137                 c->y = c->mon->my + c->mon->mh - HEIGHT(c);
1138         c->x = MAX(c->x, c->mon->mx);
1139         /* only fix client y-offset, if the client center might cover the bar */
1140         c->y = MAX(c->y, ((c->mon->by == c->mon->my) && (c->x + (c->w / 2) >= c->mon->wx)
1141                 && (c->x + (c->w / 2) < c->mon->wx + c->mon->ww)) ? bh : c->mon->my);
1142         c->bw = borderpx;
1143
1144         wc.border_width = c->bw;
1145         XConfigureWindow(dpy, w, CWBorderWidth, &wc);
1146         XSetWindowBorder(dpy, w, scheme[SchemeNorm][ColBorder].pixel);
1147         configure(c); /* propagates border_width, if size doesn't change */
1148         updatewindowtype(c);
1149         updatesizehints(c);
1150         updatewmhints(c);
1151         XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
1152         grabbuttons(c, 0);
1153         if (!c->isfloating)
1154                 c->isfloating = c->oldstate = trans != None || c->isfixed;
1155         if (c->isfloating)
1156                 XRaiseWindow(dpy, c->win);
1157         attach(c);
1158         attachstack(c);
1159         XChangeProperty(dpy, root, netatom[NetClientList], XA_WINDOW, 32, PropModeAppend,
1160                 (unsigned char *) &(c->win), 1);
1161         XMoveResizeWindow(dpy, c->win, c->x + 2 * sw, c->y, c->w, c->h); /* some windows require this */
1162         setclientstate(c, NormalState);
1163         if (c->mon == selmon)
1164                 unfocus(selmon->sel, 0);
1165         c->mon->sel = c;
1166         arrange(c->mon);
1167         XMapWindow(dpy, c->win);
1168         if (term)
1169                 swallow(term, c);
1170         focus(NULL);
1171 }
1172
1173 void
1174 mappingnotify(XEvent *e)
1175 {
1176         XMappingEvent *ev = &e->xmapping;
1177
1178         XRefreshKeyboardMapping(ev);
1179         if (ev->request == MappingKeyboard)
1180                 grabkeys();
1181 }
1182
1183 void
1184 maprequest(XEvent *e)
1185 {
1186         static XWindowAttributes wa;
1187         XMapRequestEvent *ev = &e->xmaprequest;
1188
1189         if (!XGetWindowAttributes(dpy, ev->window, &wa))
1190                 return;
1191         if (wa.override_redirect)
1192                 return;
1193         if (!wintoclient(ev->window))
1194                 manage(ev->window, &wa);
1195 }
1196
1197 void
1198 monocle(Monitor *m)
1199 {
1200         unsigned int n = 0;
1201         Client *c;
1202
1203         for (c = m->clients; c; c = c->next)
1204                 if (ISVISIBLE(c))
1205                         n++;
1206         if (n > 0) /* override layout symbol */
1207                 snprintf(m->ltsymbol, sizeof m->ltsymbol, "[%d]", n);
1208         for (c = nexttiled(m->clients); c; c = nexttiled(c->next))
1209                 resize(c, m->wx, m->wy, m->ww - 2 * c->bw, m->wh - 2 * c->bw, 0);
1210 }
1211
1212 void
1213 motionnotify(XEvent *e)
1214 {
1215         static Monitor *mon = NULL;
1216         Monitor *m;
1217         XMotionEvent *ev = &e->xmotion;
1218
1219         if (ev->window != root)
1220                 return;
1221         if ((m = recttomon(ev->x_root, ev->y_root, 1, 1)) != mon && mon) {
1222                 unfocus(selmon->sel, 1);
1223                 selmon = m;
1224                 focus(NULL);
1225         }
1226         mon = m;
1227 }
1228
1229 void
1230 movemouse(const Arg *arg)
1231 {
1232         int x, y, ocx, ocy, nx, ny;
1233         Client *c;
1234         Monitor *m;
1235         XEvent ev;
1236         Time lasttime = 0;
1237
1238         if (!(c = selmon->sel))
1239                 return;
1240         if (c->isfullscreen) /* no support moving fullscreen windows by mouse */
1241                 return;
1242         restack(selmon);
1243         ocx = c->x;
1244         ocy = c->y;
1245         if (XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1246                 None, cursor[CurMove]->cursor, CurrentTime) != GrabSuccess)
1247                 return;
1248         if (!getrootptr(&x, &y))
1249                 return;
1250         do {
1251                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1252                 switch(ev.type) {
1253                 case ConfigureRequest:
1254                 case Expose:
1255                 case MapRequest:
1256                         handler[ev.type](&ev);
1257                         break;
1258                 case MotionNotify:
1259                         if ((ev.xmotion.time - lasttime) <= (1000 / 60))
1260                                 continue;
1261                         lasttime = ev.xmotion.time;
1262
1263                         nx = ocx + (ev.xmotion.x - x);
1264                         ny = ocy + (ev.xmotion.y - y);
1265                         if (abs(selmon->wx - nx) < snap)
1266                                 nx = selmon->wx;
1267                         else if (abs((selmon->wx + selmon->ww) - (nx + WIDTH(c))) < snap)
1268                                 nx = selmon->wx + selmon->ww - WIDTH(c);
1269                         if (abs(selmon->wy - ny) < snap)
1270                                 ny = selmon->wy;
1271                         else if (abs((selmon->wy + selmon->wh) - (ny + HEIGHT(c))) < snap)
1272                                 ny = selmon->wy + selmon->wh - HEIGHT(c);
1273                         if (!c->isfloating && selmon->lt[selmon->sellt]->arrange
1274                         && (abs(nx - c->x) > snap || abs(ny - c->y) > snap))
1275                                 togglefloating(NULL);
1276                         if (!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1277                                 resize(c, nx, ny, c->w, c->h, 1);
1278                         break;
1279                 }
1280         } while (ev.type != ButtonRelease);
1281         XUngrabPointer(dpy, CurrentTime);
1282         if ((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1283                 sendmon(c, m);
1284                 selmon = m;
1285                 focus(NULL);
1286         }
1287 }
1288
1289 Client *
1290 nexttiled(Client *c)
1291 {
1292         for (; c && (c->isfloating || !ISVISIBLE(c)); c = c->next);
1293         return c;
1294 }
1295
1296 void
1297 pop(Client *c)
1298 {
1299         detach(c);
1300         attach(c);
1301         focus(c);
1302         arrange(c->mon);
1303 }
1304
1305 void
1306 propertynotify(XEvent *e)
1307 {
1308         Client *c;
1309         Window trans;
1310         XPropertyEvent *ev = &e->xproperty;
1311
1312         if ((ev->window == root) && (ev->atom == XA_WM_NAME))
1313                 updatestatus();
1314         else if (ev->state == PropertyDelete)
1315                 return; /* ignore */
1316         else if ((c = wintoclient(ev->window))) {
1317                 switch(ev->atom) {
1318                 default: break;
1319                 case XA_WM_TRANSIENT_FOR:
1320                         if (!c->isfloating && (XGetTransientForHint(dpy, c->win, &trans)) &&
1321                                 (c->isfloating = (wintoclient(trans)) != NULL))
1322                                 arrange(c->mon);
1323                         break;
1324                 case XA_WM_NORMAL_HINTS:
1325                         updatesizehints(c);
1326                         break;
1327                 case XA_WM_HINTS:
1328                         updatewmhints(c);
1329                         drawbars();
1330                         break;
1331                 }
1332                 if (ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
1333                         updatetitle(c);
1334                         if (c == c->mon->sel)
1335                                 drawbar(c->mon);
1336                 }
1337                 if (ev->atom == netatom[NetWMWindowType])
1338                         updatewindowtype(c);
1339         }
1340 }
1341
1342 void
1343 quit(const Arg *arg)
1344 {
1345         if(arg->i) restart = 1;
1346         running = 0;
1347 }
1348
1349 Monitor *
1350 recttomon(int x, int y, int w, int h)
1351 {
1352         Monitor *m, *r = selmon;
1353         int a, area = 0;
1354
1355         for (m = mons; m; m = m->next)
1356                 if ((a = INTERSECT(x, y, w, h, m)) > area) {
1357                         area = a;
1358                         r = m;
1359                 }
1360         return r;
1361 }
1362
1363 void
1364 resize(Client *c, int x, int y, int w, int h, int interact)
1365 {
1366         if (applysizehints(c, &x, &y, &w, &h, interact))
1367                 resizeclient(c, x, y, w, h);
1368 }
1369
1370 void
1371 resizeclient(Client *c, int x, int y, int w, int h)
1372 {
1373         XWindowChanges wc;
1374
1375         c->oldx = c->x; c->x = wc.x = x;
1376         c->oldy = c->y; c->y = wc.y = y;
1377         c->oldw = c->w; c->w = wc.width = w;
1378         c->oldh = c->h; c->h = wc.height = h;
1379         wc.border_width = c->bw;
1380         XConfigureWindow(dpy, c->win, CWX|CWY|CWWidth|CWHeight|CWBorderWidth, &wc);
1381         configure(c);
1382         XSync(dpy, False);
1383 }
1384
1385 void
1386 resizemouse(const Arg *arg)
1387 {
1388         int ocx, ocy, nw, nh;
1389         Client *c;
1390         Monitor *m;
1391         XEvent ev;
1392         Time lasttime = 0;
1393
1394         if (!(c = selmon->sel))
1395                 return;
1396         if (c->isfullscreen) /* no support resizing fullscreen windows by mouse */
1397                 return;
1398         restack(selmon);
1399         ocx = c->x;
1400         ocy = c->y;
1401         if (XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1402                 None, cursor[CurResize]->cursor, CurrentTime) != GrabSuccess)
1403                 return;
1404         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1405         do {
1406                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1407                 switch(ev.type) {
1408                 case ConfigureRequest:
1409                 case Expose:
1410                 case MapRequest:
1411                         handler[ev.type](&ev);
1412                         break;
1413                 case MotionNotify:
1414                         if ((ev.xmotion.time - lasttime) <= (1000 / 60))
1415                                 continue;
1416                         lasttime = ev.xmotion.time;
1417
1418                         nw = MAX(ev.xmotion.x - ocx - 2 * c->bw + 1, 1);
1419                         nh = MAX(ev.xmotion.y - ocy - 2 * c->bw + 1, 1);
1420                         if (c->mon->wx + nw >= selmon->wx && c->mon->wx + nw <= selmon->wx + selmon->ww
1421                         && c->mon->wy + nh >= selmon->wy && c->mon->wy + nh <= selmon->wy + selmon->wh)
1422                         {
1423                                 if (!c->isfloating && selmon->lt[selmon->sellt]->arrange
1424                                 && (abs(nw - c->w) > snap || abs(nh - c->h) > snap))
1425                                         togglefloating(NULL);
1426                         }
1427                         if (!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1428                                 resize(c, c->x, c->y, nw, nh, 1);
1429                         break;
1430                 }
1431         } while (ev.type != ButtonRelease);
1432         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1433         XUngrabPointer(dpy, CurrentTime);
1434         while (XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1435         if ((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1436                 sendmon(c, m);
1437                 selmon = m;
1438                 focus(NULL);
1439         }
1440 }
1441
1442 void
1443 restack(Monitor *m)
1444 {
1445         Client *c;
1446         XEvent ev;
1447         XWindowChanges wc;
1448
1449         drawbar(m);
1450         if (!m->sel)
1451                 return;
1452         if (m->sel->isfloating || !m->lt[m->sellt]->arrange)
1453                 XRaiseWindow(dpy, m->sel->win);
1454         if (m->lt[m->sellt]->arrange) {
1455                 wc.stack_mode = Below;
1456                 wc.sibling = m->barwin;
1457                 for (c = m->stack; c; c = c->snext)
1458                         if (!c->isfloating && ISVISIBLE(c)) {
1459                                 XConfigureWindow(dpy, c->win, CWSibling|CWStackMode, &wc);
1460                                 wc.sibling = c->win;
1461                         }
1462         }
1463         XSync(dpy, False);
1464         while (XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1465 }
1466
1467 void
1468 run(void)
1469 {
1470         XEvent ev;
1471         /* main event loop */
1472         XSync(dpy, False);
1473         while (running && !XNextEvent(dpy, &ev))
1474                 if (handler[ev.type])
1475                         handler[ev.type](&ev); /* call handler */
1476 }
1477
1478 void
1479 scan(void)
1480 {
1481         unsigned int i, num;
1482         Window d1, d2, *wins = NULL;
1483         XWindowAttributes wa;
1484
1485         if (XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
1486                 for (i = 0; i < num; i++) {
1487                         if (!XGetWindowAttributes(dpy, wins[i], &wa)
1488                         || wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
1489                                 continue;
1490                         if (wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
1491                                 manage(wins[i], &wa);
1492                 }
1493                 for (i = 0; i < num; i++) { /* now the transients */
1494                         if (!XGetWindowAttributes(dpy, wins[i], &wa))
1495                                 continue;
1496                         if (XGetTransientForHint(dpy, wins[i], &d1)
1497                         && (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
1498                                 manage(wins[i], &wa);
1499                 }
1500                 if (wins)
1501                         XFree(wins);
1502         }
1503 }
1504
1505 void
1506 sendmon(Client *c, Monitor *m)
1507 {
1508         if (c->mon == m)
1509                 return;
1510         unfocus(c, 1);
1511         detach(c);
1512         detachstack(c);
1513         c->mon = m;
1514         c->tags = m->tagset[m->seltags]; /* assign tags of target monitor */
1515         attach(c);
1516         attachstack(c);
1517         focus(NULL);
1518         arrange(NULL);
1519 }
1520
1521 void
1522 setclientstate(Client *c, long state)
1523 {
1524         long data[] = { state, None };
1525
1526         XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
1527                 PropModeReplace, (unsigned char *)data, 2);
1528 }
1529
1530 int
1531 sendevent(Client *c, Atom proto)
1532 {
1533         int n;
1534         Atom *protocols;
1535         int exists = 0;
1536         XEvent ev;
1537
1538         if (XGetWMProtocols(dpy, c->win, &protocols, &n)) {
1539                 while (!exists && n--)
1540                         exists = protocols[n] == proto;
1541                 XFree(protocols);
1542         }
1543         if (exists) {
1544                 ev.type = ClientMessage;
1545                 ev.xclient.window = c->win;
1546                 ev.xclient.message_type = wmatom[WMProtocols];
1547                 ev.xclient.format = 32;
1548                 ev.xclient.data.l[0] = proto;
1549                 ev.xclient.data.l[1] = CurrentTime;
1550                 XSendEvent(dpy, c->win, False, NoEventMask, &ev);
1551         }
1552         return exists;
1553 }
1554
1555 void
1556 setfocus(Client *c)
1557 {
1558         if (!c->neverfocus) {
1559                 XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
1560                 XChangeProperty(dpy, root, netatom[NetActiveWindow],
1561                         XA_WINDOW, 32, PropModeReplace,
1562                         (unsigned char *) &(c->win), 1);
1563         }
1564         sendevent(c, wmatom[WMTakeFocus]);
1565 }
1566
1567 void
1568 setfullscreen(Client *c, int fullscreen)
1569 {
1570         if (fullscreen && !c->isfullscreen) {
1571                 XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1572                         PropModeReplace, (unsigned char*)&netatom[NetWMFullscreen], 1);
1573                 c->isfullscreen = 1;
1574                 c->oldstate = c->isfloating;
1575                 c->oldbw = c->bw;
1576                 c->bw = 0;
1577                 c->isfloating = 1;
1578                 resizeclient(c, c->mon->mx, c->mon->my, c->mon->mw, c->mon->mh);
1579                 XRaiseWindow(dpy, c->win);
1580         } else if (!fullscreen && c->isfullscreen){
1581                 XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1582                         PropModeReplace, (unsigned char*)0, 0);
1583                 c->isfullscreen = 0;
1584                 c->isfloating = c->oldstate;
1585                 c->bw = c->oldbw;
1586                 c->x = c->oldx;
1587                 c->y = c->oldy;
1588                 c->w = c->oldw;
1589                 c->h = c->oldh;
1590                 resizeclient(c, c->x, c->y, c->w, c->h);
1591                 arrange(c->mon);
1592         }
1593 }
1594
1595 void
1596 setgaps(const Arg *arg)
1597 {
1598         if ((arg->i == 0) || (selmon->gappx + arg->i < 0))
1599                 selmon->gappx = 0;
1600         else
1601                 selmon->gappx += arg->i;
1602         arrange(selmon);
1603 }
1604
1605 void
1606 setlayout(const Arg *arg)
1607 {
1608         if (!arg || !arg->v || arg->v != selmon->lt[selmon->sellt])
1609                 selmon->sellt ^= 1;
1610         if (arg && arg->v)
1611                 selmon->lt[selmon->sellt] = (Layout *)arg->v;
1612         strncpy(selmon->ltsymbol, selmon->lt[selmon->sellt]->symbol, sizeof selmon->ltsymbol);
1613         if (selmon->sel)
1614                 arrange(selmon);
1615         else
1616                 drawbar(selmon);
1617 }
1618
1619 /* arg > 1.0 will set mfact absolutely */
1620 void
1621 setmfact(const Arg *arg)
1622 {
1623         float f;
1624
1625         if (!arg || !selmon->lt[selmon->sellt]->arrange)
1626                 return;
1627         f = arg->f < 1.0 ? arg->f + selmon->mfact : arg->f - 1.0;
1628         if (f < 0.05 || f > 0.95)
1629                 return;
1630         selmon->mfact = f;
1631         arrange(selmon);
1632 }
1633
1634 void
1635 setup(void)
1636 {
1637         int i;
1638         XSetWindowAttributes wa;
1639         Atom utf8string;
1640
1641         /* clean up any zombies immediately */
1642         sigchld(0);
1643
1644         signal(SIGHUP, sighup);
1645         signal(SIGTERM, sigterm);
1646
1647         /* init screen */
1648         screen = DefaultScreen(dpy);
1649         sw = DisplayWidth(dpy, screen);
1650         sh = DisplayHeight(dpy, screen);
1651         root = RootWindow(dpy, screen);
1652         xinitvisual();
1653         drw = drw_create(dpy, screen, root, sw, sh, visual, depth, cmap);
1654         if (!drw_fontset_create(drw, fonts, LENGTH(fonts)))
1655                 die("no fonts could be loaded.");
1656         lrpad = drw->fonts->h;
1657         bh = drw->fonts->h + 2;
1658         updategeom();
1659         /* init atoms */
1660         utf8string = XInternAtom(dpy, "UTF8_STRING", False);
1661         wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
1662         wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
1663         wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
1664         wmatom[WMTakeFocus] = XInternAtom(dpy, "WM_TAKE_FOCUS", False);
1665         netatom[NetActiveWindow] = XInternAtom(dpy, "_NET_ACTIVE_WINDOW", False);
1666         netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
1667         netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
1668         netatom[NetWMState] = XInternAtom(dpy, "_NET_WM_STATE", False);
1669         netatom[NetWMCheck] = XInternAtom(dpy, "_NET_SUPPORTING_WM_CHECK", False);
1670         netatom[NetWMFullscreen] = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);
1671         netatom[NetWMWindowType] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE", False);
1672         netatom[NetWMWindowTypeDialog] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE_DIALOG", False);
1673         netatom[NetClientList] = XInternAtom(dpy, "_NET_CLIENT_LIST", False);
1674         /* init cursors */
1675         cursor[CurNormal] = drw_cur_create(drw, XC_left_ptr);
1676         cursor[CurResize] = drw_cur_create(drw, XC_sizing);
1677         cursor[CurMove] = drw_cur_create(drw, XC_fleur);
1678         /* init appearance */
1679         scheme = ecalloc(LENGTH(colors), sizeof(Clr *));
1680         for (i = 0; i < LENGTH(colors); i++)
1681                 scheme[i] = drw_scm_create(drw, colors[i], alphas[i], 3);
1682         /* init bars */
1683         updatebars();
1684         updatestatus();
1685         /* supporting window for NetWMCheck */
1686         wmcheckwin = XCreateSimpleWindow(dpy, root, 0, 0, 1, 1, 0, 0, 0);
1687         XChangeProperty(dpy, wmcheckwin, netatom[NetWMCheck], XA_WINDOW, 32,
1688                 PropModeReplace, (unsigned char *) &wmcheckwin, 1);
1689         XChangeProperty(dpy, wmcheckwin, netatom[NetWMName], utf8string, 8,
1690                 PropModeReplace, (unsigned char *) "dwm", 3);
1691         XChangeProperty(dpy, root, netatom[NetWMCheck], XA_WINDOW, 32,
1692                 PropModeReplace, (unsigned char *) &wmcheckwin, 1);
1693         /* EWMH support per view */
1694         XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
1695                 PropModeReplace, (unsigned char *) netatom, NetLast);
1696         XDeleteProperty(dpy, root, netatom[NetClientList]);
1697         /* select events */
1698         wa.cursor = cursor[CurNormal]->cursor;
1699         wa.event_mask = SubstructureRedirectMask|SubstructureNotifyMask
1700                 |ButtonPressMask|PointerMotionMask|EnterWindowMask
1701                 |LeaveWindowMask|StructureNotifyMask|PropertyChangeMask;
1702         XChangeWindowAttributes(dpy, root, CWEventMask|CWCursor, &wa);
1703         XSelectInput(dpy, root, wa.event_mask);
1704         grabkeys();
1705         focus(NULL);
1706 }
1707
1708
1709 void
1710 seturgent(Client *c, int urg)
1711 {
1712         XWMHints *wmh;
1713
1714         c->isurgent = urg;
1715         if (!(wmh = XGetWMHints(dpy, c->win)))
1716                 return;
1717         wmh->flags = urg ? (wmh->flags | XUrgencyHint) : (wmh->flags & ~XUrgencyHint);
1718         XSetWMHints(dpy, c->win, wmh);
1719         XFree(wmh);
1720 }
1721
1722 void
1723 showhide(Client *c)
1724 {
1725         if (!c)
1726                 return;
1727         if (ISVISIBLE(c)) {
1728                 /* show clients top down */
1729                 XMoveWindow(dpy, c->win, c->x, c->y);
1730                 if ((!c->mon->lt[c->mon->sellt]->arrange || c->isfloating) && !c->isfullscreen)
1731                         resize(c, c->x, c->y, c->w, c->h, 0);
1732                 showhide(c->snext);
1733         } else {
1734                 /* hide clients bottom up */
1735                 showhide(c->snext);
1736                 XMoveWindow(dpy, c->win, WIDTH(c) * -2, c->y);
1737         }
1738 }
1739
1740 void
1741 sigchld(int unused)
1742 {
1743         if (signal(SIGCHLD, sigchld) == SIG_ERR)
1744                 die("can't install SIGCHLD handler:");
1745         while (0 < waitpid(-1, NULL, WNOHANG));
1746 }
1747
1748 void
1749 sighup(int unused)
1750 {
1751         Arg a = {.i = 1};
1752         quit(&a);
1753 }
1754
1755 void
1756 sigterm(int unused)
1757 {
1758         Arg a = {.i = 0};
1759         quit(&a);
1760 }
1761
1762 void
1763 spawn(const Arg *arg)
1764 {
1765         if (arg->v == dmenucmd)
1766                 dmenumon[0] = '0' + selmon->num;
1767         if (fork() == 0) {
1768                 if (dpy)
1769                         close(ConnectionNumber(dpy));
1770                 setsid();
1771                 execvp(((char **)arg->v)[0], (char **)arg->v);
1772                 fprintf(stderr, "dwm: execvp %s", ((char **)arg->v)[0]);
1773                 perror(" failed");
1774                 exit(EXIT_SUCCESS);
1775         }
1776 }
1777
1778 void
1779 tag(const Arg *arg)
1780 {
1781         if (selmon->sel && arg->ui & TAGMASK) {
1782                 selmon->sel->tags = arg->ui & TAGMASK;
1783                 focus(NULL);
1784                 arrange(selmon);
1785         }
1786 }
1787
1788 void
1789 tagmon(const Arg *arg)
1790 {
1791         if (!selmon->sel || !mons->next)
1792                 return;
1793         sendmon(selmon->sel, dirtomon(arg->i));
1794 }
1795
1796 void
1797 tile(Monitor *m)
1798 {
1799         unsigned int i, n, h, mw, my, ty;
1800         Client *c;
1801
1802         for (n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
1803         if (n == 0)
1804                 return;
1805
1806         if (n > m->nmaster)
1807                 mw = m->nmaster ? m->ww * m->mfact : 0;
1808         else
1809                 mw = m->ww - m->gappx;
1810         for (i = 0, my = ty = m->gappx, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++)
1811                 if (i < m->nmaster) {
1812                         h = (m->wh - my) / (MIN(n, m->nmaster) - i) - m->gappx;
1813                         resize(c, m->wx + m->gappx, m->wy + my, mw - (2*c->bw) - m->gappx, h - (2*c->bw), 0);
1814                         if (my + HEIGHT(c) + m->gappx < m->wh)
1815                                 my += HEIGHT(c) + m->gappx;
1816                 } else {
1817                         h = (m->wh - ty) / (n - i) - m->gappx;
1818                         resize(c, m->wx + mw + m->gappx, m->wy + ty, m->ww - mw - (2*c->bw) - 2*m->gappx, h - (2*c->bw), 0);
1819                         if (ty + HEIGHT(c) + m->gappx < m->wh)
1820                                 ty += HEIGHT(c) + m->gappx;
1821                 }
1822 }
1823
1824 void
1825 togglebar(const Arg *arg)
1826 {
1827         selmon->showbar = !selmon->showbar;
1828         updatebarpos(selmon);
1829         XMoveResizeWindow(dpy, selmon->barwin, selmon->wx, selmon->by, selmon->ww, bh);
1830         arrange(selmon);
1831 }
1832
1833 void
1834 togglefloating(const Arg *arg)
1835 {
1836         if (!selmon->sel)
1837                 return;
1838         if (selmon->sel->isfullscreen) /* no support for fullscreen windows */
1839                 return;
1840         selmon->sel->isfloating = !selmon->sel->isfloating || selmon->sel->isfixed;
1841         if (selmon->sel->isfloating)
1842                 resize(selmon->sel, selmon->sel->x, selmon->sel->y,
1843                         selmon->sel->w, selmon->sel->h, 0);
1844         arrange(selmon);
1845 }
1846
1847 void
1848 togglefullscr(const Arg *arg)
1849 {
1850   if(selmon->sel)
1851     setfullscreen(selmon->sel, !selmon->sel->isfullscreen);
1852 }
1853
1854 void
1855 toggletag(const Arg *arg)
1856 {
1857         unsigned int newtags;
1858
1859         if (!selmon->sel)
1860                 return;
1861         newtags = selmon->sel->tags ^ (arg->ui & TAGMASK);
1862         if (newtags) {
1863                 selmon->sel->tags = newtags;
1864                 focus(NULL);
1865                 arrange(selmon);
1866         }
1867 }
1868
1869 void
1870 toggleview(const Arg *arg)
1871 {
1872         unsigned int newtagset = selmon->tagset[selmon->seltags] ^ (arg->ui & TAGMASK);
1873
1874         if (newtagset) {
1875                 selmon->tagset[selmon->seltags] = newtagset;
1876                 focus(NULL);
1877                 arrange(selmon);
1878         }
1879 }
1880
1881 void
1882 unfocus(Client *c, int setfocus)
1883 {
1884         if (!c)
1885                 return;
1886         grabbuttons(c, 0);
1887         XSetWindowBorder(dpy, c->win, scheme[SchemeNorm][ColBorder].pixel);
1888         if (setfocus) {
1889                 XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
1890                 XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
1891         }
1892 }
1893
1894 void
1895 unmanage(Client *c, int destroyed)
1896 {
1897         Monitor *m = c->mon;
1898         XWindowChanges wc;
1899
1900         if (c->swallowing) {
1901                 unswallow(c);
1902                 return;
1903         }
1904
1905         Client *s = swallowingclient(c->win);
1906         if (s) {
1907                 free(s->swallowing);
1908                 s->swallowing = NULL;
1909                 arrange(m);
1910                 focus(NULL);
1911                 return;
1912         }
1913
1914         detach(c);
1915         detachstack(c);
1916         if (!destroyed) {
1917                 wc.border_width = c->oldbw;
1918                 XGrabServer(dpy); /* avoid race conditions */
1919                 XSetErrorHandler(xerrordummy);
1920                 XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
1921                 XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1922                 setclientstate(c, WithdrawnState);
1923                 XSync(dpy, False);
1924                 XSetErrorHandler(xerror);
1925                 XUngrabServer(dpy);
1926         }
1927         free(c);
1928
1929         if (!s) {
1930                 arrange(m);
1931                 focus(NULL);
1932                 updateclientlist();
1933         }
1934 }
1935
1936 void
1937 unmapnotify(XEvent *e)
1938 {
1939         Client *c;
1940         XUnmapEvent *ev = &e->xunmap;
1941
1942         if ((c = wintoclient(ev->window))) {
1943                 if (ev->send_event)
1944                         setclientstate(c, WithdrawnState);
1945                 else
1946                         unmanage(c, 0);
1947         }
1948 }
1949
1950 void
1951 updatebars(void)
1952 {
1953         Monitor *m;
1954         XSetWindowAttributes wa = {
1955                 .override_redirect = True,
1956                 .background_pixel = 0,
1957                 .border_pixel = 0,
1958                 .colormap = cmap,
1959                 .event_mask = ButtonPressMask|ExposureMask
1960         };
1961         XClassHint ch = {"dwm", "dwm"};
1962         for (m = mons; m; m = m->next) {
1963                 if (m->barwin)
1964                         continue;
1965                 m->barwin = XCreateWindow(dpy, root, m->wx, m->by, m->ww, bh, 0, depth,
1966                                           InputOutput, visual,
1967                                           CWOverrideRedirect|CWBackPixel|CWBorderPixel|CWColormap|CWEventMask, &wa);
1968                 XDefineCursor(dpy, m->barwin, cursor[CurNormal]->cursor);
1969                 XMapRaised(dpy, m->barwin);
1970                 XSetClassHint(dpy, m->barwin, &ch);
1971         }
1972 }
1973
1974 void
1975 updatebarpos(Monitor *m)
1976 {
1977         m->wy = m->my;
1978         m->wh = m->mh;
1979         if (m->showbar) {
1980                 m->wh -= bh;
1981                 m->by = m->topbar ? m->wy : m->wy + m->wh;
1982                 m->wy = m->topbar ? m->wy + bh : m->wy;
1983         } else
1984                 m->by = -bh;
1985 }
1986
1987 void
1988 updateclientlist()
1989 {
1990         Client *c;
1991         Monitor *m;
1992
1993         XDeleteProperty(dpy, root, netatom[NetClientList]);
1994         for (m = mons; m; m = m->next)
1995                 for (c = m->clients; c; c = c->next)
1996                         XChangeProperty(dpy, root, netatom[NetClientList],
1997                                 XA_WINDOW, 32, PropModeAppend,
1998                                 (unsigned char *) &(c->win), 1);
1999 }
2000
2001 int
2002 updategeom(void)
2003 {
2004         int dirty = 0;
2005
2006 #ifdef XINERAMA
2007         if (XineramaIsActive(dpy)) {
2008                 int i, j, n, nn;
2009                 Client *c;
2010                 Monitor *m;
2011                 XineramaScreenInfo *info = XineramaQueryScreens(dpy, &nn);
2012                 XineramaScreenInfo *unique = NULL;
2013
2014                 for (n = 0, m = mons; m; m = m->next, n++);
2015                 /* only consider unique geometries as separate screens */
2016                 unique = ecalloc(nn, sizeof(XineramaScreenInfo));
2017                 for (i = 0, j = 0; i < nn; i++)
2018                         if (isuniquegeom(unique, j, &info[i]))
2019                                 memcpy(&unique[j++], &info[i], sizeof(XineramaScreenInfo));
2020                 XFree(info);
2021                 nn = j;
2022                 if (n <= nn) { /* new monitors available */
2023                         for (i = 0; i < (nn - n); i++) {
2024                                 for (m = mons; m && m->next; m = m->next);
2025                                 if (m)
2026                                         m->next = createmon();
2027                                 else
2028                                         mons = createmon();
2029                         }
2030                         for (i = 0, m = mons; i < nn && m; m = m->next, i++)
2031                                 if (i >= n
2032                                 || unique[i].x_org != m->mx || unique[i].y_org != m->my
2033                                 || unique[i].width != m->mw || unique[i].height != m->mh)
2034                                 {
2035                                         dirty = 1;
2036                                         m->num = i;
2037                                         m->mx = m->wx = unique[i].x_org;
2038                                         m->my = m->wy = unique[i].y_org;
2039                                         m->mw = m->ww = unique[i].width;
2040                                         m->mh = m->wh = unique[i].height;
2041                                         updatebarpos(m);
2042                                 }
2043                 } else { /* less monitors available nn < n */
2044                         for (i = nn; i < n; i++) {
2045                                 for (m = mons; m && m->next; m = m->next);
2046                                 while ((c = m->clients)) {
2047                                         dirty = 1;
2048                                         m->clients = c->next;
2049                                         detachstack(c);
2050                                         c->mon = mons;
2051                                         attach(c);
2052                                         attachstack(c);
2053                                 }
2054                                 if (m == selmon)
2055                                         selmon = mons;
2056                                 cleanupmon(m);
2057                         }
2058                 }
2059                 free(unique);
2060         } else
2061 #endif /* XINERAMA */
2062         { /* default monitor setup */
2063                 if (!mons)
2064                         mons = createmon();
2065                 if (mons->mw != sw || mons->mh != sh) {
2066                         dirty = 1;
2067                         mons->mw = mons->ww = sw;
2068                         mons->mh = mons->wh = sh;
2069                         updatebarpos(mons);
2070                 }
2071         }
2072         if (dirty) {
2073                 selmon = mons;
2074                 selmon = wintomon(root);
2075         }
2076         return dirty;
2077 }
2078
2079 void
2080 updatenumlockmask(void)
2081 {
2082         unsigned int i, j;
2083         XModifierKeymap *modmap;
2084
2085         numlockmask = 0;
2086         modmap = XGetModifierMapping(dpy);
2087         for (i = 0; i < 8; i++)
2088                 for (j = 0; j < modmap->max_keypermod; j++)
2089                         if (modmap->modifiermap[i * modmap->max_keypermod + j]
2090                                 == XKeysymToKeycode(dpy, XK_Num_Lock))
2091                                 numlockmask = (1 << i);
2092         XFreeModifiermap(modmap);
2093 }
2094
2095 void
2096 updatesizehints(Client *c)
2097 {
2098         long msize;
2099         XSizeHints size;
2100
2101         if (!XGetWMNormalHints(dpy, c->win, &size, &msize))
2102                 /* size is uninitialized, ensure that size.flags aren't used */
2103                 size.flags = PSize;
2104         if (size.flags & PBaseSize) {
2105                 c->basew = size.base_width;
2106                 c->baseh = size.base_height;
2107         } else if (size.flags & PMinSize) {
2108                 c->basew = size.min_width;
2109                 c->baseh = size.min_height;
2110         } else
2111                 c->basew = c->baseh = 0;
2112         if (size.flags & PResizeInc) {
2113                 c->incw = size.width_inc;
2114                 c->inch = size.height_inc;
2115         } else
2116                 c->incw = c->inch = 0;
2117         if (size.flags & PMaxSize) {
2118                 c->maxw = size.max_width;
2119                 c->maxh = size.max_height;
2120         } else
2121                 c->maxw = c->maxh = 0;
2122         if (size.flags & PMinSize) {
2123                 c->minw = size.min_width;
2124                 c->minh = size.min_height;
2125         } else if (size.flags & PBaseSize) {
2126                 c->minw = size.base_width;
2127                 c->minh = size.base_height;
2128         } else
2129                 c->minw = c->minh = 0;
2130         if (size.flags & PAspect) {
2131                 c->mina = (float)size.min_aspect.y / size.min_aspect.x;
2132                 c->maxa = (float)size.max_aspect.x / size.max_aspect.y;
2133         } else
2134                 c->maxa = c->mina = 0.0;
2135         c->isfixed = (c->maxw && c->maxh && c->maxw == c->minw && c->maxh == c->minh);
2136 }
2137
2138 void
2139 updatestatus(void)
2140 {
2141         if (!gettextprop(root, XA_WM_NAME, stext, sizeof(stext)))
2142                 strcpy(stext, "dwm-"VERSION);
2143         drawbar(selmon);
2144 }
2145
2146 void
2147 updatetitle(Client *c)
2148 {
2149         if (!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
2150                 gettextprop(c->win, XA_WM_NAME, c->name, sizeof c->name);
2151         if (c->name[0] == '\0') /* hack to mark broken clients */
2152                 strcpy(c->name, broken);
2153 }
2154
2155 void
2156 updatewindowtype(Client *c)
2157 {
2158         Atom state = getatomprop(c, netatom[NetWMState]);
2159         Atom wtype = getatomprop(c, netatom[NetWMWindowType]);
2160
2161         if (state == netatom[NetWMFullscreen])
2162                 setfullscreen(c, 1);
2163         if (wtype == netatom[NetWMWindowTypeDialog])
2164                 c->isfloating = 1;
2165 }
2166
2167 void
2168 updatewmhints(Client *c)
2169 {
2170         XWMHints *wmh;
2171
2172         if ((wmh = XGetWMHints(dpy, c->win))) {
2173                 if (c == selmon->sel && wmh->flags & XUrgencyHint) {
2174                         wmh->flags &= ~XUrgencyHint;
2175                         XSetWMHints(dpy, c->win, wmh);
2176                 } else
2177                         c->isurgent = (wmh->flags & XUrgencyHint) ? 1 : 0;
2178                 if (wmh->flags & InputHint)
2179                         c->neverfocus = !wmh->input;
2180                 else
2181                         c->neverfocus = 0;
2182                 XFree(wmh);
2183         }
2184 }
2185
2186 void
2187 view(const Arg *arg)
2188 {
2189         if ((arg->ui & TAGMASK) == selmon->tagset[selmon->seltags])
2190                 return;
2191         selmon->seltags ^= 1; /* toggle sel tagset */
2192         if (arg->ui & TAGMASK)
2193                 selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
2194         focus(NULL);
2195         arrange(selmon);
2196 }
2197
2198 pid_t
2199 winpid(Window w)
2200 {
2201
2202         pid_t result = 0;
2203
2204 #ifdef __linux__
2205         xcb_res_client_id_spec_t spec = {0};
2206         spec.client = w;
2207         spec.mask = XCB_RES_CLIENT_ID_MASK_LOCAL_CLIENT_PID;
2208
2209         xcb_generic_error_t *e = NULL;
2210         xcb_res_query_client_ids_cookie_t c = xcb_res_query_client_ids(xcon, 1, &spec);
2211         xcb_res_query_client_ids_reply_t *r = xcb_res_query_client_ids_reply(xcon, c, &e);
2212
2213         if (!r)
2214                 return (pid_t)0;
2215
2216         xcb_res_client_id_value_iterator_t i = xcb_res_query_client_ids_ids_iterator(r);
2217         for (; i.rem; xcb_res_client_id_value_next(&i)) {
2218                 spec = i.data->spec;
2219                 if (spec.mask & XCB_RES_CLIENT_ID_MASK_LOCAL_CLIENT_PID) {
2220                         uint32_t *t = xcb_res_client_id_value_value(i.data);
2221                         result = *t;
2222                         break;
2223                 }
2224         }
2225
2226         free(r);
2227
2228         if (result == (pid_t)-1)
2229                 result = 0;
2230
2231 #endif /* __linux__ */
2232
2233 #ifdef __OpenBSD__
2234         Atom type;
2235         int format;
2236         unsigned long len, bytes;
2237         unsigned char *prop;
2238         pid_t ret;
2239
2240         if (XGetWindowProperty(dpy, w, XInternAtom(dpy, "_NET_WM_PID", 0), 0, 1, False, AnyPropertyType, &type, &format, &len, &bytes, &prop) != Success || !prop)
2241                return 0;
2242
2243         ret = *(pid_t*)prop;
2244         XFree(prop);
2245         result = ret;
2246
2247 #endif /* __OpenBSD__ */
2248         return result;
2249 }
2250
2251 pid_t
2252 getparentprocess(pid_t p)
2253 {
2254         unsigned int v = 0;
2255
2256 #ifdef __linux__
2257         FILE *f;
2258         char buf[256];
2259         snprintf(buf, sizeof(buf) - 1, "/proc/%u/stat", (unsigned)p);
2260
2261         if (!(f = fopen(buf, "r")))
2262                 return 0;
2263
2264         fscanf(f, "%*u %*s %*c %u", &v);
2265         fclose(f);
2266 #endif /* __linux__*/
2267
2268 #ifdef __OpenBSD__
2269         int n;
2270         kvm_t *kd;
2271         struct kinfo_proc *kp;
2272
2273         kd = kvm_openfiles(NULL, NULL, NULL, KVM_NO_FILES, NULL);
2274         if (!kd)
2275                 return 0;
2276
2277         kp = kvm_getprocs(kd, KERN_PROC_PID, p, sizeof(*kp), &n);
2278         v = kp->p_ppid;
2279 #endif /* __OpenBSD__ */
2280
2281         return (pid_t)v;
2282 }
2283
2284 int
2285 isdescprocess(pid_t p, pid_t c)
2286 {
2287         while (p != c && c != 0)
2288                 c = getparentprocess(c);
2289
2290         return (int)c;
2291 }
2292
2293 Client *
2294 termforwin(const Client *w)
2295 {
2296         Client *c;
2297         Monitor *m;
2298
2299         if (!w->pid || w->isterminal)
2300                 return NULL;
2301
2302         for (m = mons; m; m = m->next) {
2303                 for (c = m->clients; c; c = c->next) {
2304                         if (c->isterminal && !c->swallowing && c->pid && isdescprocess(c->pid, w->pid))
2305                                 return c;
2306                 }
2307         }
2308
2309         return NULL;
2310 }
2311
2312 Client *
2313 swallowingclient(Window w)
2314 {
2315         Client *c;
2316         Monitor *m;
2317
2318         for (m = mons; m; m = m->next) {
2319                 for (c = m->clients; c; c = c->next) {
2320                         if (c->swallowing && c->swallowing->win == w)
2321                                 return c;
2322                 }
2323         }
2324
2325         return NULL;
2326 }
2327
2328 Client *
2329 wintoclient(Window w)
2330 {
2331         Client *c;
2332         Monitor *m;
2333
2334         for (m = mons; m; m = m->next)
2335                 for (c = m->clients; c; c = c->next)
2336                         if (c->win == w)
2337                                 return c;
2338         return NULL;
2339 }
2340
2341 Monitor *
2342 wintomon(Window w)
2343 {
2344         int x, y;
2345         Client *c;
2346         Monitor *m;
2347
2348         if (w == root && getrootptr(&x, &y))
2349                 return recttomon(x, y, 1, 1);
2350         for (m = mons; m; m = m->next)
2351                 if (w == m->barwin)
2352                         return m;
2353         if ((c = wintoclient(w)))
2354                 return c->mon;
2355         return selmon;
2356 }
2357
2358 /* There's no way to check accesses to destroyed windows, thus those cases are
2359  * ignored (especially on UnmapNotify's). Other types of errors call Xlibs
2360  * default error handler, which may call exit. */
2361 int
2362 xerror(Display *dpy, XErrorEvent *ee)
2363 {
2364         if (ee->error_code == BadWindow
2365         || (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
2366         || (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
2367         || (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
2368         || (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
2369         || (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
2370         || (ee->request_code == X_GrabButton && ee->error_code == BadAccess)
2371         || (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
2372         || (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
2373                 return 0;
2374         fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
2375                 ee->request_code, ee->error_code);
2376         return xerrorxlib(dpy, ee); /* may call exit */
2377 }
2378
2379 int
2380 xerrordummy(Display *dpy, XErrorEvent *ee)
2381 {
2382         return 0;
2383 }
2384
2385 /* Startup Error handler to check if another window manager
2386  * is already running. */
2387 int
2388 xerrorstart(Display *dpy, XErrorEvent *ee)
2389 {
2390         die("dwm: another window manager is already running");
2391         return -1;
2392 }
2393
2394 void
2395 xinitvisual()
2396 {
2397         XVisualInfo *infos;
2398         XRenderPictFormat *fmt;
2399         int nitems;
2400         int i;
2401
2402         XVisualInfo tpl = {
2403                 .screen = screen,
2404                 .depth = 32,
2405                 .class = TrueColor
2406         };
2407         long masks = VisualScreenMask | VisualDepthMask | VisualClassMask;
2408
2409         infos = XGetVisualInfo(dpy, masks, &tpl, &nitems);
2410         visual = NULL;
2411         for(i = 0; i < nitems; i ++) {
2412                 fmt = XRenderFindVisualFormat(dpy, infos[i].visual);
2413                 if (fmt->type == PictTypeDirect && fmt->direct.alphaMask) {
2414                         visual = infos[i].visual;
2415                         depth = infos[i].depth;
2416                         cmap = XCreateColormap(dpy, root, visual, AllocNone);
2417                         useargb = 1;
2418                         break;
2419                 }
2420         }
2421
2422         XFree(infos);
2423
2424         if (! visual) {
2425                 visual = DefaultVisual(dpy, screen);
2426                 depth = DefaultDepth(dpy, screen);
2427                 cmap = DefaultColormap(dpy, screen);
2428         }
2429 }
2430
2431 void
2432 zoom(const Arg *arg)
2433 {
2434         Client *c = selmon->sel;
2435
2436         if (!selmon->lt[selmon->sellt]->arrange
2437         || (selmon->sel && selmon->sel->isfloating))
2438                 return;
2439         if (c == nexttiled(selmon->clients))
2440                 if (!c || !(c = nexttiled(c->next)))
2441                         return;
2442         pop(c);
2443 }
2444
2445 int
2446 main(int argc, char *argv[])
2447 {
2448         if (argc == 2 && !strcmp("-v", argv[1]))
2449                 die("dwm-"VERSION);
2450         else if (argc != 1)
2451                 die("usage: dwm [-v]");
2452         if (!setlocale(LC_CTYPE, "") || !XSupportsLocale())
2453                 fputs("warning: no locale support\n", stderr);
2454         if (!(dpy = XOpenDisplay(NULL)))
2455                 die("dwm: cannot open display");
2456         if (!(xcon = XGetXCBConnection(dpy)))
2457                 die("dwm: cannot get xcb connection\n");
2458         checkotherwm();
2459         setup();
2460 #ifdef __OpenBSD__
2461         if (pledge("stdio rpath proc exec ps", NULL) == -1)
2462                 die("pledge");
2463 #endif /* __OpenBSD__ */
2464         scan();
2465         run();
2466         if(restart) execvp(argv[0], argv);
2467         cleanup();
2468         XCloseDisplay(dpy);
2469         return EXIT_SUCCESS;
2470 }