dwm

My fork of dwm.
git clone git://git.alex.balgavy.eu/dwm.git
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dwm.c (70046B)


      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 #include <X11/Xresource.h>
     40 #ifdef XINERAMA
     41 #include <X11/extensions/Xinerama.h>
     42 #endif /* XINERAMA */
     43 #include <X11/Xft/Xft.h>
     44 #include <X11/Xlib-xcb.h>
     45 #include <xcb/res.h>
     46 #ifdef __OpenBSD__
     47 #include <sys/sysctl.h>
     48 #include <kvm.h>
     49 #endif /* __OpenBSD */
     50 
     51 #include "drw.h"
     52 #include "util.h"
     53 
     54 /* macros */
     55 #define BUTTONMASK              (ButtonPressMask|ButtonReleaseMask)
     56 #define CLEANMASK(mask)         (mask & ~(numlockmask|LockMask) & (ShiftMask|ControlMask|Mod1Mask|Mod2Mask|Mod3Mask|Mod4Mask|Mod5Mask))
     57 #define GETINC(X)               ((X) - 2000)
     58 #define INC(X)                  ((X) + 2000)
     59 #define INTERSECT(x,y,w,h,m)    (MAX(0, MIN((x)+(w),(m)->wx+(m)->ww) - MAX((x),(m)->wx)) \
     60                                * MAX(0, MIN((y)+(h),(m)->wy+(m)->wh) - MAX((y),(m)->wy)))
     61 #define ISINC(X)                ((X) > 1000 && (X) < 3000)
     62 #define ISVISIBLE(C)            ((C->tags & C->mon->tagset[C->mon->seltags]) || C->issticky)
     63 #define PREVSEL                 3000
     64 #define LENGTH(X)               (sizeof X / sizeof X[0])
     65 #define MOD(N,M)                ((N)%(M) < 0 ? (N)%(M) + (M) : (N)%(M))
     66 #define MOUSEMASK               (BUTTONMASK|PointerMotionMask)
     67 #define WIDTH(X)                ((X)->w + 2 * (X)->bw)
     68 #define HEIGHT(X)               ((X)->h + 2 * (X)->bw)
     69 #define TAGMASK                 ((1 << LENGTH(tags)) - 1)
     70 #define TEXTW(X)                (drw_fontset_getwidth(drw, (X)) + lrpad)
     71 #define TRUNC(X,A,B)            (MAX((A), MIN((X), (B))))
     72 
     73 /* enums */
     74 enum { CurNormal, CurResize, CurMove, CurLast }; /* cursor */
     75 enum { SchemeNorm, SchemeSel }; /* color schemes */
     76 enum { NetSupported, NetWMName, NetWMState, NetWMCheck,
     77        NetWMFullscreen, NetActiveWindow, NetWMWindowType,
     78        NetWMWindowTypeDialog, NetClientList, NetLast }; /* EWMH atoms */
     79 enum { WMProtocols, WMDelete, WMState, WMTakeFocus, WMLast }; /* default atoms */
     80 enum { ClkTagBar, ClkLtSymbol, ClkStatusText, ClkWinTitle,
     81        ClkClientWin, ClkRootWin, ClkLast }; /* clicks */
     82 
     83 typedef union {
     84 	int i;
     85 	unsigned int ui;
     86 	float f;
     87 	const void *v;
     88 } Arg;
     89 
     90 typedef struct {
     91 	unsigned int click;
     92 	unsigned int mask;
     93 	unsigned int button;
     94 	void (*func)(const Arg *arg);
     95 	const Arg arg;
     96 } Button;
     97 
     98 typedef struct Monitor Monitor;
     99 typedef struct Client Client;
    100 struct Client {
    101 	char name[256];
    102 	float mina, maxa;
    103 	int x, y, w, h;
    104 	int oldx, oldy, oldw, oldh;
    105 	int basew, baseh, incw, inch, maxw, maxh, minw, minh;
    106 	int bw, oldbw;
    107 	unsigned int tags;
    108 	int isfixed, isfloating, isurgent, neverfocus, oldstate, isfullscreen, isterminal, noswallow, issticky;
    109 	int fakefullscreen;
    110 	pid_t pid;
    111 	Client *next;
    112 	Client *snext;
    113 	Client *swallowing;
    114 	Monitor *mon;
    115 	Window win;
    116 };
    117 
    118 typedef struct {
    119 	unsigned int mod;
    120 	KeySym keysym;
    121 	void (*func)(const Arg *);
    122 	const Arg arg;
    123 } Key;
    124 
    125 typedef struct {
    126 	const char *symbol;
    127 	void (*arrange)(Monitor *);
    128 } Layout;
    129 
    130 typedef struct Pertag Pertag;
    131 struct Monitor {
    132 	char ltsymbol[16];
    133 	float mfact;
    134 	int nmaster;
    135 	int num;
    136 	int by;               /* bar geometry */
    137 	int mx, my, mw, mh;   /* screen size */
    138 	int wx, wy, ww, wh;   /* window area  */
    139 	int gappih;           /* horizontal gap between windows */
    140 	int gappiv;           /* vertical gap between windows */
    141 	int gappoh;           /* horizontal outer gaps */
    142 	int gappov;           /* vertical outer gaps */
    143 	unsigned int seltags;
    144 	unsigned int sellt;
    145 	unsigned int tagset[2];
    146 	int showbar;
    147 	int topbar;
    148 	Client *clients;
    149 	Client *sel;
    150 	Client *stack;
    151 	Monitor *next;
    152 	Window barwin;
    153 	const Layout *lt[2];
    154 	Pertag *pertag;
    155 };
    156 
    157 typedef struct {
    158 	const char *class;
    159 	const char *instance;
    160 	const char *title;
    161 	unsigned int tags;
    162 	int isfloating;
    163 	int isterminal;
    164 	int noswallow;
    165 	int monitor;
    166 } Rule;
    167 
    168 /* Xresources preferences */
    169 enum resource_type {
    170 	STRING = 0,
    171 	INTEGER = 1,
    172 	FLOAT = 2
    173 };
    174 
    175 typedef struct {
    176 	char *name;
    177 	enum resource_type type;
    178 	void *dst;
    179 } ResourcePref;
    180 
    181 /* function declarations */
    182 static void applyrules(Client *c);
    183 static int applysizehints(Client *c, int *x, int *y, int *w, int *h, int interact);
    184 static void arrange(Monitor *m);
    185 static void arrangemon(Monitor *m);
    186 static void attach(Client *c);
    187 static void attachstack(Client *c);
    188 static void buttonpress(XEvent *e);
    189 static void checkotherwm(void);
    190 static void cleanup(void);
    191 static void cleanupmon(Monitor *mon);
    192 static void clientmessage(XEvent *e);
    193 static void configure(Client *c);
    194 static void configurenotify(XEvent *e);
    195 static void configurerequest(XEvent *e);
    196 static Monitor *createmon(void);
    197 static void destroynotify(XEvent *e);
    198 static void detach(Client *c);
    199 static void detachstack(Client *c);
    200 static Monitor *dirtomon(int dir);
    201 static void drawbar(Monitor *m);
    202 static void drawbars(void);
    203 static void enternotify(XEvent *e);
    204 static void expose(XEvent *e);
    205 static void focus(Client *c);
    206 static void focusin(XEvent *e);
    207 static void focusmon(const Arg *arg);
    208 static void focusstack(const Arg *arg);
    209 static Atom getatomprop(Client *c, Atom prop);
    210 static int getrootptr(int *x, int *y);
    211 static long getstate(Window w);
    212 static pid_t getstatusbarpid();
    213 static int gettextprop(Window w, Atom atom, char *text, unsigned int size);
    214 static void grabbuttons(Client *c, int focused);
    215 static void grabkeys(void);
    216 static void incnmaster(const Arg *arg);
    217 static void keypress(XEvent *e);
    218 static void killclient(const Arg *arg);
    219 static void manage(Window w, XWindowAttributes *wa);
    220 static void mappingnotify(XEvent *e);
    221 static void maprequest(XEvent *e);
    222 static void monocle(Monitor *m);
    223 static void motionnotify(XEvent *e);
    224 static void movemouse(const Arg *arg);
    225 static Client *nexttiled(Client *c);
    226 static void pop(Client *);
    227 static void propertynotify(XEvent *e);
    228 static void pushstack(const Arg *arg);
    229 static void quit(const Arg *arg);
    230 static Monitor *recttomon(int x, int y, int w, int h);
    231 static void resize(Client *c, int x, int y, int w, int h, int interact);
    232 static void resizeclient(Client *c, int x, int y, int w, int h);
    233 static void resizemouse(const Arg *arg);
    234 static void restack(Monitor *m);
    235 static void run(void);
    236 static void scan(void);
    237 static int sendevent(Client *c, Atom proto);
    238 static void sendmon(Client *c, Monitor *m);
    239 static void setclientstate(Client *c, long state);
    240 static void setfocus(Client *c);
    241 static void setfullscreen(Client *c, int fullscreen);
    242 static void setlayout(const Arg *arg);
    243 static void setmfact(const Arg *arg);
    244 static void setup(void);
    245 static void seturgent(Client *c, int urg);
    246 static void showhide(Client *c);
    247 static void sigchld(int unused);
    248 static void sigstatusbar(const Arg *arg);
    249 static void spawn(const Arg *arg);
    250 static int stackpos(const Arg *arg);
    251 static void tag(const Arg *arg);
    252 static void tagmon(const Arg *arg);
    253 static void togglebar(const Arg *arg);
    254 static void togglefakefullscreen(const Arg *arg);
    255 static void togglefloating(const Arg *arg);
    256 static void togglesticky(const Arg *arg);
    257 static void togglescratch(const Arg *arg);
    258 static void togglefullscr(const Arg *arg);
    259 static void toggletag(const Arg *arg);
    260 static void toggletagscratch(const Arg *arg);
    261 static void toggleview(const Arg *arg);
    262 static void unfocus(Client *c, int setfocus);
    263 static void unmanage(Client *c, int destroyed);
    264 static void unmapnotify(XEvent *e);
    265 static void updatebarpos(Monitor *m);
    266 static void updatebars(void);
    267 static void updateclientlist(void);
    268 static int updategeom(void);
    269 static void updatenumlockmask(void);
    270 static void updatesizehints(Client *c);
    271 static void updatestatus(void);
    272 static void updatetitle(Client *c);
    273 static void updatewindowtype(Client *c);
    274 static void updatewmhints(Client *c);
    275 static void view(const Arg *arg);
    276 static Client *wintoclient(Window w);
    277 static Monitor *wintomon(Window w);
    278 static int xerror(Display *dpy, XErrorEvent *ee);
    279 static int xerrordummy(Display *dpy, XErrorEvent *ee);
    280 static int xerrorstart(Display *dpy, XErrorEvent *ee);
    281 static void zoom(const Arg *arg);
    282 static void load_xresources(void);
    283 static void livereload_xresources(const Arg *arg);
    284 static void resource_load(XrmDatabase db, char *name, enum resource_type rtype, void *dst);
    285 static void jumptotag(const Arg *arg);
    286 
    287 static pid_t getparentprocess(pid_t p);
    288 static int isdescprocess(pid_t p, pid_t c);
    289 static Client *swallowingclient(Window w);
    290 static Client *termforwin(const Client *c);
    291 static pid_t winpid(Window w);
    292 
    293 /* variables */
    294 static const char broken[] = "broken";
    295 static char stext[256];
    296 static int statusw;
    297 static int statussig;
    298 static pid_t statuspid = -1;
    299 static int screen;
    300 static int sw, sh;           /* X display screen geometry width, height */
    301 static int bh, blw = 0;      /* bar geometry */
    302 static int lrpad;            /* sum of left and right padding for text */
    303 static int (*xerrorxlib)(Display *, XErrorEvent *);
    304 static unsigned int numlockmask = 0;
    305 static void (*handler[LASTEvent]) (XEvent *) = {
    306 	[ButtonPress] = buttonpress,
    307 	[ClientMessage] = clientmessage,
    308 	[ConfigureRequest] = configurerequest,
    309 	[ConfigureNotify] = configurenotify,
    310 	[DestroyNotify] = destroynotify,
    311 	[EnterNotify] = enternotify,
    312 	[Expose] = expose,
    313 	[FocusIn] = focusin,
    314 	[KeyPress] = keypress,
    315 	[MappingNotify] = mappingnotify,
    316 	[MapRequest] = maprequest,
    317 	[MotionNotify] = motionnotify,
    318 	[PropertyNotify] = propertynotify,
    319 	[UnmapNotify] = unmapnotify
    320 };
    321 static Atom wmatom[WMLast], netatom[NetLast];
    322 static int running = 1;
    323 static Cur *cursor[CurLast];
    324 static Clr **scheme;
    325 static Display *dpy;
    326 static Drw *drw;
    327 static Monitor *mons, *selmon;
    328 static Window root, wmcheckwin;
    329 
    330 static xcb_connection_t *xcon;
    331 
    332 /* configuration, allows nested code to access above variables */
    333 #include "config.h"
    334 
    335 struct Pertag {
    336 	unsigned int curtag, prevtag; /* current and previous tag */
    337 	int nmasters[LENGTH(tags) + 1]; /* number of windows in master area */
    338 	float mfacts[LENGTH(tags) + 1]; /* mfacts per tag */
    339 	unsigned int sellts[LENGTH(tags) + 1]; /* selected layouts */
    340 	const Layout *ltidxs[LENGTH(tags) + 1][2]; /* matrix of tags and layouts indexes  */
    341 	int showbars[LENGTH(tags) + 1]; /* display bar for the current tag */
    342 };
    343 
    344 static unsigned int scratchtag = 1 << LENGTH(tags);
    345 
    346 /* compile-time check if all tags fit into an unsigned int bit array. */
    347 struct NumTags { char limitexceeded[LENGTH(tags) > 31 ? -1 : 1]; };
    348 
    349 static unsigned int swallow_next = 1;
    350 
    351 /* function implementations */
    352 void
    353 applyrules(Client *c)
    354 {
    355 	const char *class, *instance;
    356 	unsigned int i;
    357 	const Rule *r;
    358 	Monitor *m;
    359 	XClassHint ch = { NULL, NULL };
    360 
    361 	/* rule matching */
    362 	c->isfloating = 0;
    363 	c->tags = 0;
    364 	XGetClassHint(dpy, c->win, &ch);
    365 	class    = ch.res_class ? ch.res_class : broken;
    366 	instance = ch.res_name  ? ch.res_name  : broken;
    367 
    368 	int longest_rule_match = 0;
    369 
    370 	for (i = 0; i < LENGTH(rules); i++) {
    371 		r = &rules[i];
    372 
    373 		int rule_title_len = 0;
    374 		if (r->title)
    375 			rule_title_len = strlen(r->title);
    376 
    377 		if ((!r->title || (strstr(c->name, r->title) && (rule_title_len > longest_rule_match)))
    378 		&& (!r->class || strstr(class, r->class))
    379 		&& (!r->instance || strstr(instance, r->instance)))
    380 		{
    381 			if (r->title)
    382 				longest_rule_match = rule_title_len;
    383 			c->isterminal = r->isterminal;
    384 			c->noswallow  = r->noswallow;
    385 			c->isfloating = r->isfloating;
    386 			c->tags = r->tags; // I don't want the rules to be additive
    387 			for (m = mons; m && m->num != r->monitor; m = m->next);
    388 			if (m)
    389 				c->mon = m;
    390 		}
    391 	}
    392 	if (ch.res_class)
    393 		XFree(ch.res_class);
    394 	if (ch.res_name)
    395 		XFree(ch.res_name);
    396 	c->tags = c->tags & TAGMASK ? c->tags & TAGMASK : c->mon->tagset[c->mon->seltags];
    397 }
    398 
    399 int
    400 applysizehints(Client *c, int *x, int *y, int *w, int *h, int interact)
    401 {
    402 	int baseismin;
    403 	Monitor *m = c->mon;
    404 
    405 	/* set minimum possible */
    406 	*w = MAX(1, *w);
    407 	*h = MAX(1, *h);
    408 	if (interact) {
    409 		if (*x > sw)
    410 			*x = sw - WIDTH(c);
    411 		if (*y > sh)
    412 			*y = sh - HEIGHT(c);
    413 		if (*x + *w + 2 * c->bw < 0)
    414 			*x = 0;
    415 		if (*y + *h + 2 * c->bw < 0)
    416 			*y = 0;
    417 	} else {
    418 		if (*x >= m->wx + m->ww)
    419 			*x = m->wx + m->ww - WIDTH(c);
    420 		if (*y >= m->wy + m->wh)
    421 			*y = m->wy + m->wh - HEIGHT(c);
    422 		if (*x + *w + 2 * c->bw <= m->wx)
    423 			*x = m->wx;
    424 		if (*y + *h + 2 * c->bw <= m->wy)
    425 			*y = m->wy;
    426 	}
    427 	if (*h < bh)
    428 		*h = bh;
    429 	if (*w < bh)
    430 		*w = bh;
    431 	if (resizehints || c->isfloating || !c->mon->lt[c->mon->sellt]->arrange) {
    432 		/* see last two sentences in ICCCM 4.1.2.3 */
    433 		baseismin = c->basew == c->minw && c->baseh == c->minh;
    434 		if (!baseismin) { /* temporarily remove base dimensions */
    435 			*w -= c->basew;
    436 			*h -= c->baseh;
    437 		}
    438 		/* adjust for aspect limits */
    439 		if (c->mina > 0 && c->maxa > 0) {
    440 			if (c->maxa < (float)*w / *h)
    441 				*w = *h * c->maxa + 0.5;
    442 			else if (c->mina < (float)*h / *w)
    443 				*h = *w * c->mina + 0.5;
    444 		}
    445 		if (baseismin) { /* increment calculation requires this */
    446 			*w -= c->basew;
    447 			*h -= c->baseh;
    448 		}
    449 		/* adjust for increment value */
    450 		if (c->incw)
    451 			*w -= *w % c->incw;
    452 		if (c->inch)
    453 			*h -= *h % c->inch;
    454 		/* restore base dimensions */
    455 		*w = MAX(*w + c->basew, c->minw);
    456 		*h = MAX(*h + c->baseh, c->minh);
    457 		if (c->maxw)
    458 			*w = MIN(*w, c->maxw);
    459 		if (c->maxh)
    460 			*h = MIN(*h, c->maxh);
    461 	}
    462 	return *x != c->x || *y != c->y || *w != c->w || *h != c->h;
    463 }
    464 
    465 void
    466 arrange(Monitor *m)
    467 {
    468 	if (m)
    469 		showhide(m->stack);
    470 	else for (m = mons; m; m = m->next)
    471 		showhide(m->stack);
    472 	if (m) {
    473 		arrangemon(m);
    474 		restack(m);
    475 	} else for (m = mons; m; m = m->next)
    476 		arrangemon(m);
    477 }
    478 
    479 void
    480 arrangemon(Monitor *m)
    481 {
    482 	strncpy(m->ltsymbol, m->lt[m->sellt]->symbol, sizeof m->ltsymbol);
    483 	if (m->lt[m->sellt]->arrange)
    484 		m->lt[m->sellt]->arrange(m);
    485 }
    486 
    487 void
    488 attach(Client *c)
    489 {
    490 	c->next = c->mon->clients;
    491 	c->mon->clients = c;
    492 }
    493 
    494 void
    495 attachstack(Client *c)
    496 {
    497 	c->snext = c->mon->stack;
    498 	c->mon->stack = c;
    499 }
    500 
    501 void
    502 swallow(Client *p, Client *c)
    503 {
    504 	if (!swallow_next) {
    505 		swallow_next = 1;
    506 		return;
    507 	}
    508 
    509 	if (c->noswallow || c->isterminal)
    510 		return;
    511 	if (c->noswallow && !swallowfloating && c->isfloating)
    512 		return;
    513 
    514 	detach(c);
    515 	detachstack(c);
    516 
    517 	setclientstate(c, WithdrawnState);
    518 	XUnmapWindow(dpy, p->win);
    519 
    520 	p->swallowing = c;
    521 	c->mon = p->mon;
    522 
    523 	Window w = p->win;
    524 	p->win = c->win;
    525 	c->win = w;
    526 	updatetitle(p);
    527 	XMoveResizeWindow(dpy, p->win, p->x, p->y, p->w, p->h);
    528 	arrange(p->mon);
    529 	configure(p);
    530 	updateclientlist();
    531 }
    532 
    533 void
    534 unswallow(Client *c)
    535 {
    536 	c->win = c->swallowing->win;
    537 
    538 	free(c->swallowing);
    539 	c->swallowing = NULL;
    540 
    541 	/* unfullscreen the client */
    542 	setfullscreen(c, 0);
    543 	updatetitle(c);
    544 	arrange(c->mon);
    545 	XMapWindow(dpy, c->win);
    546 	XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
    547 	setclientstate(c, NormalState);
    548 	focus(NULL);
    549 	arrange(c->mon);
    550 }
    551 
    552 void
    553 buttonpress(XEvent *e)
    554 {
    555 	unsigned int i, x, click, occ = 0;
    556 	Arg arg = {0};
    557 	Client *c;
    558 	Monitor *m;
    559 	XButtonPressedEvent *ev = &e->xbutton;
    560 	char *text, *s, ch;
    561 
    562 	click = ClkRootWin;
    563 	/* focus monitor if necessary */
    564 	if ((m = wintomon(ev->window)) && m != selmon) {
    565 		unfocus(selmon->sel, 1);
    566 		selmon = m;
    567 		focus(NULL);
    568 	}
    569 	if (ev->window == selmon->barwin) {
    570 		i = x = 0;
    571 		for (c = m->clients; c; c = c->next)
    572 			occ |= c->tags == 255 ? 0 : c->tags;
    573 		do {
    574 			/* do not reserve space for vacant tags */
    575 			if (!(occ & 1 << i || m->tagset[m->seltags] & 1 << i))
    576 				continue;
    577 			x += TEXTW(tags[i]);
    578 		} while (ev->x >= x && ++i < LENGTH(tags));
    579 		if (i < LENGTH(tags)) {
    580 			click = ClkTagBar;
    581 			arg.ui = 1 << i;
    582 		} else if (ev->x < x + blw)
    583 			click = ClkLtSymbol;
    584                 else if (ev->x > selmon->ww - statusw) {
    585                         x = selmon->ww - statusw;
    586 			click = ClkStatusText;
    587 			statussig = 0;
    588 			for (text = s = stext; *s && x <= ev->x; s++) {
    589 			  if ((unsigned char)(*s) < ' ') {
    590 			    ch = *s;
    591 			    *s = '\0';
    592 			    x += TEXTW(text) - lrpad;
    593 			    *s = ch;
    594 			    text = s + 1;
    595 			    if (x >= ev->x)
    596 			      break;
    597 			    statussig = ch;
    598                           }
    599                         }
    600                 } else
    601 			click = ClkWinTitle;
    602 	} else if ((c = wintoclient(ev->window))) {
    603 		focus(c);
    604 		restack(selmon);
    605 		XAllowEvents(dpy, ReplayPointer, CurrentTime);
    606 		click = ClkClientWin;
    607 	}
    608 	for (i = 0; i < LENGTH(buttons); i++)
    609 		if (click == buttons[i].click && buttons[i].func && buttons[i].button == ev->button
    610 		&& CLEANMASK(buttons[i].mask) == CLEANMASK(ev->state))
    611 			buttons[i].func(click == ClkTagBar && buttons[i].arg.i == 0 ? &arg : &buttons[i].arg);
    612 }
    613 
    614 void
    615 checkotherwm(void)
    616 {
    617 	xerrorxlib = XSetErrorHandler(xerrorstart);
    618 	/* this causes an error if some other window manager is running */
    619 	XSelectInput(dpy, DefaultRootWindow(dpy), SubstructureRedirectMask);
    620 	XSync(dpy, False);
    621 	XSetErrorHandler(xerror);
    622 	XSync(dpy, False);
    623 }
    624 
    625 void
    626 cleanup(void)
    627 {
    628 	Arg a = {.ui = ~0};
    629 	Layout foo = { "", NULL };
    630 	Monitor *m;
    631 	size_t i;
    632 
    633 	view(&a);
    634 	selmon->lt[selmon->sellt] = &foo;
    635 	for (m = mons; m; m = m->next)
    636 		while (m->stack)
    637 			unmanage(m->stack, 0);
    638 	XUngrabKey(dpy, AnyKey, AnyModifier, root);
    639 	while (mons)
    640 		cleanupmon(mons);
    641 	for (i = 0; i < CurLast; i++)
    642 		drw_cur_free(drw, cursor[i]);
    643 	for (i = 0; i < LENGTH(colors); i++)
    644 		free(scheme[i]);
    645 	XDestroyWindow(dpy, wmcheckwin);
    646 	drw_free(drw);
    647 	XSync(dpy, False);
    648 	XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
    649 	XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
    650 }
    651 
    652 void
    653 cleanupmon(Monitor *mon)
    654 {
    655 	Monitor *m;
    656 
    657 	if (mon == mons)
    658 		mons = mons->next;
    659 	else {
    660 		for (m = mons; m && m->next != mon; m = m->next);
    661 		m->next = mon->next;
    662 	}
    663 	XUnmapWindow(dpy, mon->barwin);
    664 	XDestroyWindow(dpy, mon->barwin);
    665 	free(mon);
    666 }
    667 
    668 void
    669 clientmessage(XEvent *e)
    670 {
    671 	XClientMessageEvent *cme = &e->xclient;
    672 	Client *c = wintoclient(cme->window);
    673 	unsigned int i;
    674 
    675 	if (!c)
    676 		return;
    677 	if (cme->message_type == netatom[NetWMState]) {
    678 		if (cme->data.l[1] == netatom[NetWMFullscreen]
    679 		|| cme->data.l[2] == netatom[NetWMFullscreen])
    680 			setfullscreen(c, (cme->data.l[0] == 1 /* _NET_WM_STATE_ADD    */
    681 				|| (cme->data.l[0] == 2 /* _NET_WM_STATE_TOGGLE */ && !c->isfullscreen)));
    682 	} else if (cme->message_type == netatom[NetActiveWindow]) {
    683 		for (i = 0; i < LENGTH(tags) && !((1 << i) & c->tags); i++);
    684 		if (i < LENGTH(tags)) {
    685 			const Arg a = {.ui = 1 << i};
    686 			selmon = c->mon;
    687 			view(&a);
    688 			focus(c);
    689 			restack(selmon);
    690 		}
    691 	}
    692 }
    693 
    694 void
    695 configure(Client *c)
    696 {
    697 	XConfigureEvent ce;
    698 
    699 	ce.type = ConfigureNotify;
    700 	ce.display = dpy;
    701 	ce.event = c->win;
    702 	ce.window = c->win;
    703 	ce.x = c->x;
    704 	ce.y = c->y;
    705 	ce.width = c->w;
    706 	ce.height = c->h;
    707 	ce.border_width = c->bw;
    708 	ce.above = None;
    709 	ce.override_redirect = False;
    710 	XSendEvent(dpy, c->win, False, StructureNotifyMask, (XEvent *)&ce);
    711 }
    712 
    713 void
    714 configurenotify(XEvent *e)
    715 {
    716 	Monitor *m;
    717 	Client *c;
    718 	XConfigureEvent *ev = &e->xconfigure;
    719 	int dirty;
    720 
    721 	/* TODO: updategeom handling sucks, needs to be simplified */
    722 	if (ev->window == root) {
    723 		dirty = (sw != ev->width || sh != ev->height);
    724 		sw = ev->width;
    725 		sh = ev->height;
    726 		if (updategeom() || dirty) {
    727 			drw_resize(drw, sw, bh);
    728 			updatebars();
    729 			for (m = mons; m; m = m->next) {
    730 				for (c = m->clients; c; c = c->next)
    731 					if (c->isfullscreen && c->fakefullscreen != 1)
    732 						resizeclient(c, m->mx, m->my, m->mw, m->mh);
    733 				XMoveResizeWindow(dpy, m->barwin, m->wx, m->by, m->ww, bh);
    734 			}
    735 			focus(NULL);
    736 			arrange(NULL);
    737 		}
    738 	}
    739 }
    740 
    741 void
    742 configurerequest(XEvent *e)
    743 {
    744 	Client *c;
    745 	Monitor *m;
    746 	XConfigureRequestEvent *ev = &e->xconfigurerequest;
    747 	XWindowChanges wc;
    748 
    749 	if ((c = wintoclient(ev->window))) {
    750 		if (ev->value_mask & CWBorderWidth)
    751 			c->bw = ev->border_width;
    752 		else if (c->isfloating || !selmon->lt[selmon->sellt]->arrange) {
    753 			m = c->mon;
    754 			if (ev->value_mask & CWX) {
    755 				c->oldx = c->x;
    756 				c->x = m->mx + ev->x;
    757 			}
    758 			if (ev->value_mask & CWY) {
    759 				c->oldy = c->y;
    760 				c->y = m->my + ev->y;
    761 			}
    762 			if (ev->value_mask & CWWidth) {
    763 				c->oldw = c->w;
    764 				c->w = ev->width;
    765 			}
    766 			if (ev->value_mask & CWHeight) {
    767 				c->oldh = c->h;
    768 				c->h = ev->height;
    769 			}
    770 			if ((c->x + c->w) > m->mx + m->mw && c->isfloating)
    771 				c->x = m->mx + (m->mw / 2 - WIDTH(c) / 2); /* center in x direction */
    772 			if ((c->y + c->h) > m->my + m->mh && c->isfloating)
    773 				c->y = m->my + (m->mh / 2 - HEIGHT(c) / 2); /* center in y direction */
    774 			if ((ev->value_mask & (CWX|CWY)) && !(ev->value_mask & (CWWidth|CWHeight)))
    775 				configure(c);
    776 			if (ISVISIBLE(c))
    777 				XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
    778 		} else
    779 			configure(c);
    780 	} else {
    781 		wc.x = ev->x;
    782 		wc.y = ev->y;
    783 		wc.width = ev->width;
    784 		wc.height = ev->height;
    785 		wc.border_width = ev->border_width;
    786 		wc.sibling = ev->above;
    787 		wc.stack_mode = ev->detail;
    788 		XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
    789 	}
    790 	XSync(dpy, False);
    791 }
    792 
    793 Monitor *
    794 createmon(void)
    795 {
    796 	Monitor *m;
    797 	unsigned int i;
    798 
    799 	m = ecalloc(1, sizeof(Monitor));
    800 	m->tagset[0] = m->tagset[1] = 1;
    801 	m->mfact = mfact;
    802 	m->nmaster = nmaster;
    803 	m->showbar = showbar;
    804 	m->topbar = topbar;
    805 	m->gappih = gappih;
    806 	m->gappiv = gappiv;
    807 	m->gappoh = gappoh;
    808 	m->gappov = gappov;
    809 	m->lt[0] = &layouts[0];
    810 	m->lt[1] = &layouts[1 % LENGTH(layouts)];
    811 	strncpy(m->ltsymbol, layouts[0].symbol, sizeof m->ltsymbol);
    812 	m->pertag = ecalloc(1, sizeof(Pertag));
    813 	m->pertag->curtag = m->pertag->prevtag = 1;
    814 
    815 	for (i = 0; i <= LENGTH(tags); i++) {
    816 		m->pertag->nmasters[i] = m->nmaster;
    817 		m->pertag->mfacts[i] = m->mfact;
    818 
    819 		m->pertag->ltidxs[i][0] = m->lt[0];
    820 		m->pertag->ltidxs[i][1] = m->lt[1];
    821 		m->pertag->sellts[i] = m->sellt;
    822 
    823 		m->pertag->showbars[i] = m->showbar;
    824 	}
    825 
    826 	return m;
    827 }
    828 
    829 void
    830 destroynotify(XEvent *e)
    831 {
    832 	Client *c;
    833 	XDestroyWindowEvent *ev = &e->xdestroywindow;
    834 
    835 	if ((c = wintoclient(ev->window)))
    836 		unmanage(c, 1);
    837 
    838 	else if ((c = swallowingclient(ev->window)))
    839 		unmanage(c->swallowing, 1);
    840 }
    841 
    842 void
    843 detach(Client *c)
    844 {
    845 	Client **tc;
    846 
    847 	for (tc = &c->mon->clients; *tc && *tc != c; tc = &(*tc)->next);
    848 	*tc = c->next;
    849 }
    850 
    851 void
    852 detachstack(Client *c)
    853 {
    854 	Client **tc, *t;
    855 
    856 	for (tc = &c->mon->stack; *tc && *tc != c; tc = &(*tc)->snext);
    857 	*tc = c->snext;
    858 
    859 	if (c == c->mon->sel) {
    860 		for (t = c->mon->stack; t && !ISVISIBLE(t); t = t->snext);
    861 		c->mon->sel = t;
    862 	}
    863 }
    864 
    865 Monitor *
    866 dirtomon(int dir)
    867 {
    868 	Monitor *m = NULL;
    869 
    870 	if (dir > 0) {
    871 		if (!(m = selmon->next))
    872 			m = mons;
    873 	} else if (selmon == mons)
    874 		for (m = mons; m->next; m = m->next);
    875 	else
    876 		for (m = mons; m->next != selmon; m = m->next);
    877 	return m;
    878 }
    879 
    880 void
    881 drawbar(Monitor *m)
    882 {
    883 	int x, w, tw = 0;
    884 	int boxs = drw->fonts->h / 9;
    885 	int boxw = drw->fonts->h / 6 + 2;
    886 	unsigned int i, occ = 0, urg = 0;
    887 	Client *c;
    888 
    889 	/* draw status first so it can be overdrawn by tags later */
    890 	if (m == selmon) { /* status is only drawn on selected monitor */
    891 	        char *text, *s, ch;
    892 		drw_setscheme(drw, scheme[SchemeNorm]);
    893 
    894                 x = 0;
    895                 for (text = s = stext; *s; s++) {
    896                   if ((unsigned char)(*s) < ' ') {
    897                     ch = *s;
    898                     *s = '\0';
    899                     tw = TEXTW(text) - lrpad;
    900                     drw_text(drw, m->ww - statusw + x, 0, tw, bh, 0, text, 0);
    901                     x += tw;
    902                     *s = ch;
    903                     text = s + 1;
    904                   }
    905                 }
    906                 tw = TEXTW(text) - lrpad + 2;
    907                 drw_text(drw, m->ww - statusw + x, 0, tw, bh, 0, text, 0);
    908                 tw = statusw;
    909 	}
    910 
    911 	for (c = m->clients; c; c = c->next) {
    912 		occ |= c->tags == 255 ? 0 : c->tags;
    913 		if (c->isurgent)
    914 			urg |= c->tags;
    915 	}
    916 	x = 0;
    917 	for (i = 0; i < LENGTH(tags); i++) {
    918 		/* do not draw vacant tags */
    919 		if (!(occ & 1 << i || m->tagset[m->seltags] & 1 << i))
    920 		continue;
    921 
    922 		w = TEXTW(tags[i]);
    923 		drw_setscheme(drw, scheme[m->tagset[m->seltags] & 1 << i ? SchemeSel : SchemeNorm]);
    924 		drw_text(drw, x, 0, w, bh, lrpad / 2, tags[i], urg & 1 << i);
    925 		x += w;
    926 	}
    927 	w = blw = TEXTW(m->ltsymbol);
    928 	drw_setscheme(drw, scheme[SchemeNorm]);
    929 	x = drw_text(drw, x, 0, w, bh, lrpad / 2, m->ltsymbol, 0);
    930 
    931 	if ((w = m->ww - tw - x) > bh) {
    932 		if (m->sel) {
    933 			drw_setscheme(drw, scheme[m == selmon ? SchemeSel : SchemeNorm]);
    934 			if (selmon->pertag->curtag == 0) {
    935 				char windowlabel[20] = {0};
    936 				windowlabel[0] = '{';
    937 				char *cursor = windowlabel+1;
    938 				for (int i = 0; i < LENGTH(tags); i++) {
    939 					if (selmon->sel->tags & 1 << i) {
    940 						int written = sprintf(cursor, "%d,", i+1);
    941 						cursor += written;
    942 					}
    943 				}
    944 				*(--cursor) = '}';
    945 				x = drw_text(drw, x, 0, TEXTW(&windowlabel[0]), bh, lrpad / 2, &windowlabel[0], 0);
    946 			}
    947 			drw_text(drw, x, 0, w, bh, lrpad / 2, m->sel->name, 0);
    948 			if (m->sel->isfloating)
    949 				drw_rect(drw, x + boxs, boxs, boxw, boxw, m->sel->isfixed, 0);
    950 			if (m->sel->issticky)
    951 				drw_polygon(drw, x + boxs, m->sel->isfloating ? boxs * 2 + boxw : boxs, stickyiconbb.x, stickyiconbb.y, boxw, boxw * stickyiconbb.y / stickyiconbb.x, stickyicon, LENGTH(stickyicon), Nonconvex, m->sel->tags & m->tagset[m->seltags]);
    952 		} else {
    953 			drw_setscheme(drw, scheme[SchemeNorm]);
    954 			drw_rect(drw, x, 0, w, bh, 1, 1);
    955 		}
    956 	}
    957 	drw_map(drw, m->barwin, 0, 0, m->ww, bh);
    958 }
    959 
    960 void
    961 drawbars(void)
    962 {
    963 	Monitor *m;
    964 
    965 	for (m = mons; m; m = m->next)
    966 		drawbar(m);
    967 }
    968 
    969 void
    970 enternotify(XEvent *e)
    971 {
    972 	Client *c;
    973 	Monitor *m;
    974 	XCrossingEvent *ev = &e->xcrossing;
    975 
    976 	if ((ev->mode != NotifyNormal || ev->detail == NotifyInferior) && ev->window != root)
    977 		return;
    978 	c = wintoclient(ev->window);
    979 	m = c ? c->mon : wintomon(ev->window);
    980 	if (m != selmon) {
    981 		unfocus(selmon->sel, 1);
    982 		selmon = m;
    983 	} else if (!c || c == selmon->sel)
    984 		return;
    985 	focus(c);
    986 }
    987 
    988 void
    989 expose(XEvent *e)
    990 {
    991 	Monitor *m;
    992 	XExposeEvent *ev = &e->xexpose;
    993 
    994 	if (ev->count == 0 && (m = wintomon(ev->window)))
    995 		drawbar(m);
    996 }
    997 
    998 // Gives input focus to a visible client.
    999 // If the client is NULL, focus will be given to next visible client in
   1000 // stacking order. So the window that last had focus will receive input focus.
   1001 void
   1002 focus(Client *c)
   1003 {
   1004 	// If client is NULL or not visible, search first non-sticky visible client.
   1005 	if (!c || !ISVISIBLE(c))
   1006 		for (c = selmon->stack; c && (!ISVISIBLE(c) || c->issticky); c = c->snext);
   1007 
   1008 	// If there's a selected client on the current monitor, and is different
   1009 	// from client receiving focus, call unfocus on that client.
   1010 	if (selmon->sel && selmon->sel != c)
   1011 		unfocus(selmon->sel, 0);
   1012 
   1013 	if (c) {
   1014 		if (c->mon != selmon)
   1015 			selmon = c->mon;
   1016 		if (c->isurgent)
   1017 			seturgent(c, 0);
   1018 		detachstack(c);
   1019 		attachstack(c);
   1020 		grabbuttons(c, 1);
   1021 		XSetWindowBorder(dpy, c->win, scheme[SchemeSel][ColBorder].pixel);
   1022 		setfocus(c);
   1023 	} else {
   1024 		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
   1025 		XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
   1026 	}
   1027 	selmon->sel = c;
   1028 	drawbars();
   1029 }
   1030 
   1031 /* there are some broken focus acquiring clients needing extra handling */
   1032 void
   1033 focusin(XEvent *e)
   1034 {
   1035 	XFocusChangeEvent *ev = &e->xfocus;
   1036 
   1037 	if (selmon->sel && ev->window != selmon->sel->win)
   1038 		setfocus(selmon->sel);
   1039 }
   1040 
   1041 void
   1042 focusmon(const Arg *arg)
   1043 {
   1044 	Monitor *m;
   1045 
   1046 	if (!mons->next)
   1047 		return;
   1048 	if ((m = dirtomon(arg->i)) == selmon)
   1049 		return;
   1050 	unfocus(selmon->sel, 0);
   1051 	selmon = m;
   1052 	focus(NULL);
   1053 }
   1054 
   1055 void
   1056 focusstack(const Arg *arg)
   1057 {
   1058 	int i = stackpos(arg);
   1059 	Client *c, *p;
   1060 
   1061 	if(i < 0 || (selmon->sel->isfullscreen && lockfullscreen))
   1062 		return;
   1063 
   1064 	for(p = NULL, c = selmon->clients; c && (i || !ISVISIBLE(c));
   1065 	    i -= ISVISIBLE(c) ? 1 : 0, p = c, c = c->next);
   1066 	focus(c ? c : p);
   1067 	restack(selmon);
   1068 }
   1069 
   1070 Atom
   1071 getatomprop(Client *c, Atom prop)
   1072 {
   1073 	int di;
   1074 	unsigned long dl;
   1075 	unsigned char *p = NULL;
   1076 	Atom da, atom = None;
   1077 
   1078 	if (XGetWindowProperty(dpy, c->win, prop, 0L, sizeof atom, False, XA_ATOM,
   1079 		&da, &di, &dl, &dl, &p) == Success && p) {
   1080 		atom = *(Atom *)p;
   1081 		XFree(p);
   1082 	}
   1083 	return atom;
   1084 }
   1085 
   1086 pid_t
   1087 getstatusbarpid()
   1088 {
   1089   char buf[32], *str = buf, *c;
   1090   FILE *fp;
   1091 
   1092   if (statuspid > 0) {
   1093     snprintf(buf, sizeof(buf), "/proc/%u/cmdline", statuspid);
   1094     if ((fp = fopen(buf, "r"))) {
   1095       fgets(buf, sizeof(buf), fp);
   1096       while ((c = strchr(str, '/')))
   1097         str = c + 1;
   1098       fclose(fp);
   1099       if (!strcmp(str, STATUSBAR))
   1100         return statuspid;
   1101     }
   1102   }
   1103   if (!(fp = popen("pidof -s "STATUSBAR, "r")))
   1104     return -1;
   1105   fgets(buf, sizeof(buf), fp);
   1106   pclose(fp);
   1107   return strtol(buf, NULL, 10);
   1108 }
   1109 
   1110 int
   1111 getrootptr(int *x, int *y)
   1112 {
   1113 	int di;
   1114 	unsigned int dui;
   1115 	Window dummy;
   1116 
   1117 	return XQueryPointer(dpy, root, &dummy, &dummy, x, y, &di, &di, &dui);
   1118 }
   1119 
   1120 long
   1121 getstate(Window w)
   1122 {
   1123 	int format;
   1124 	long result = -1;
   1125 	unsigned char *p = NULL;
   1126 	unsigned long n, extra;
   1127 	Atom real;
   1128 
   1129 	if (XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
   1130 		&real, &format, &n, &extra, (unsigned char **)&p) != Success)
   1131 		return -1;
   1132 	if (n != 0)
   1133 		result = *p;
   1134 	XFree(p);
   1135 	return result;
   1136 }
   1137 
   1138 int
   1139 gettextprop(Window w, Atom atom, char *text, unsigned int size)
   1140 {
   1141 	char **list = NULL;
   1142 	int n;
   1143 	XTextProperty name;
   1144 
   1145 	if (!text || size == 0)
   1146 		return 0;
   1147 	text[0] = '\0';
   1148 	if (!XGetTextProperty(dpy, w, &name, atom) || !name.nitems)
   1149 		return 0;
   1150 	if (name.encoding == XA_STRING)
   1151 		strncpy(text, (char *)name.value, size - 1);
   1152 	else {
   1153 		if (XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success && n > 0 && *list) {
   1154 			strncpy(text, *list, size - 1);
   1155 			XFreeStringList(list);
   1156 		}
   1157 	}
   1158 	text[size - 1] = '\0';
   1159 	XFree(name.value);
   1160 	return 1;
   1161 }
   1162 
   1163 void
   1164 grabbuttons(Client *c, int focused)
   1165 {
   1166 	updatenumlockmask();
   1167 	{
   1168 		unsigned int i, j;
   1169 		unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
   1170 		XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
   1171 		if (!focused)
   1172 			XGrabButton(dpy, AnyButton, AnyModifier, c->win, False,
   1173 				BUTTONMASK, GrabModeSync, GrabModeSync, None, None);
   1174 		for (i = 0; i < LENGTH(buttons); i++)
   1175 			if (buttons[i].click == ClkClientWin)
   1176 				for (j = 0; j < LENGTH(modifiers); j++)
   1177 					XGrabButton(dpy, buttons[i].button,
   1178 						buttons[i].mask | modifiers[j],
   1179 						c->win, False, BUTTONMASK,
   1180 						GrabModeAsync, GrabModeSync, None, None);
   1181 	}
   1182 }
   1183 
   1184 void
   1185 grabkeys(void)
   1186 {
   1187 	updatenumlockmask();
   1188 	{
   1189 		unsigned int i, j;
   1190 		unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
   1191 		KeyCode code;
   1192 
   1193 		XUngrabKey(dpy, AnyKey, AnyModifier, root);
   1194 		for (i = 0; i < LENGTH(keys); i++)
   1195 			if ((code = XKeysymToKeycode(dpy, keys[i].keysym)))
   1196 				for (j = 0; j < LENGTH(modifiers); j++)
   1197 					XGrabKey(dpy, code, keys[i].mod | modifiers[j], root,
   1198 						True, GrabModeAsync, GrabModeAsync);
   1199 	}
   1200 }
   1201 
   1202 void
   1203 incnmaster(const Arg *arg)
   1204 {
   1205 	selmon->nmaster = selmon->pertag->nmasters[selmon->pertag->curtag] = MAX(selmon->nmaster + arg->i, 0);
   1206 	arrange(selmon);
   1207 }
   1208 
   1209 #ifdef XINERAMA
   1210 static int
   1211 isuniquegeom(XineramaScreenInfo *unique, size_t n, XineramaScreenInfo *info)
   1212 {
   1213 	while (n--)
   1214 		if (unique[n].x_org == info->x_org && unique[n].y_org == info->y_org
   1215 		&& unique[n].width == info->width && unique[n].height == info->height)
   1216 			return 0;
   1217 	return 1;
   1218 }
   1219 #endif /* XINERAMA */
   1220 
   1221 void
   1222 keypress(XEvent *e)
   1223 {
   1224 	unsigned int i;
   1225 	KeySym keysym;
   1226 	XKeyEvent *ev;
   1227 
   1228 	ev = &e->xkey;
   1229 	keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
   1230 	for (i = 0; i < LENGTH(keys); i++)
   1231 		if (keysym == keys[i].keysym
   1232 		&& CLEANMASK(keys[i].mod) == CLEANMASK(ev->state)
   1233 		&& keys[i].func)
   1234 			keys[i].func(&(keys[i].arg));
   1235 }
   1236 
   1237 void
   1238 killclient(const Arg *arg)
   1239 {
   1240 	if (!selmon->sel)
   1241 		return;
   1242 	if (!sendevent(selmon->sel, wmatom[WMDelete])) {
   1243 		XGrabServer(dpy);
   1244 		XSetErrorHandler(xerrordummy);
   1245 		XSetCloseDownMode(dpy, DestroyAll);
   1246 		XKillClient(dpy, selmon->sel->win);
   1247 		XSync(dpy, False);
   1248 		XSetErrorHandler(xerror);
   1249 		XUngrabServer(dpy);
   1250 	}
   1251 }
   1252 
   1253 void
   1254 manage(Window w, XWindowAttributes *wa)
   1255 {
   1256 	Client *c, *t = NULL, *term = NULL;
   1257 	Window trans = None;
   1258 	XWindowChanges wc;
   1259 
   1260 	c = ecalloc(1, sizeof(Client));
   1261 	c->win = w;
   1262 	c->pid = winpid(w);
   1263 	/* geometry */
   1264 	c->x = c->oldx = wa->x;
   1265 	c->y = c->oldy = wa->y;
   1266 	c->w = c->oldw = wa->width;
   1267 	c->h = c->oldh = wa->height;
   1268 	c->oldbw = wa->border_width;
   1269 
   1270 	updatetitle(c);
   1271 	if (XGetTransientForHint(dpy, w, &trans) && (t = wintoclient(trans))) {
   1272 		c->mon = t->mon;
   1273 		c->tags = t->tags;
   1274 	} else {
   1275 		c->mon = selmon;
   1276 		applyrules(c);
   1277 		term = termforwin(c);
   1278 	}
   1279 
   1280 	if (c->x + WIDTH(c) > c->mon->mx + c->mon->mw)
   1281 		c->x = c->mon->mx + c->mon->mw - WIDTH(c);
   1282 	if (c->y + HEIGHT(c) > c->mon->my + c->mon->mh)
   1283 		c->y = c->mon->my + c->mon->mh - HEIGHT(c);
   1284 	c->x = MAX(c->x, c->mon->mx);
   1285 	/* only fix client y-offset, if the client center might cover the bar */
   1286 	c->y = MAX(c->y, ((c->mon->by == c->mon->my) && (c->x + (c->w / 2) >= c->mon->wx)
   1287 		&& (c->x + (c->w / 2) < c->mon->wx + c->mon->ww)) ? bh : c->mon->my);
   1288 	c->bw = borderpx;
   1289 
   1290 	selmon->tagset[selmon->seltags] &= ~scratchtag;
   1291 	if (!strcmp(c->name, scratchpadname)) {
   1292 		c->mon->tagset[c->mon->seltags] |= c->tags = scratchtag;
   1293 		c->isfloating = True;
   1294 		c->x = c->mon->wx + (c->mon->ww / 2 - WIDTH(c) / 2);
   1295 		c->y = c->mon->wy + (c->mon->wh / 2 - HEIGHT(c) / 2);
   1296 	}
   1297 
   1298 	wc.border_width = c->bw;
   1299 	XConfigureWindow(dpy, w, CWBorderWidth, &wc);
   1300 	XSetWindowBorder(dpy, w, scheme[SchemeNorm][ColBorder].pixel);
   1301 	configure(c); /* propagates border_width, if size doesn't change */
   1302 	updatewindowtype(c);
   1303 	updatesizehints(c);
   1304 	updatewmhints(c);
   1305 	XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
   1306 	grabbuttons(c, 0);
   1307 	if (!c->isfloating)
   1308 		c->isfloating = c->oldstate = trans != None || c->isfixed;
   1309 	if (c->isfloating)
   1310 		XRaiseWindow(dpy, c->win);
   1311 	attach(c);
   1312 	attachstack(c);
   1313 	XChangeProperty(dpy, root, netatom[NetClientList], XA_WINDOW, 32, PropModeAppend,
   1314 		(unsigned char *) &(c->win), 1);
   1315 	XMoveResizeWindow(dpy, c->win, c->x + 2 * sw, c->y, c->w, c->h); /* some windows require this */
   1316 	setclientstate(c, NormalState);
   1317 	if (c->mon == selmon)
   1318 		unfocus(selmon->sel, 0);
   1319 	c->mon->sel = c;
   1320 	arrange(c->mon);
   1321 	XMapWindow(dpy, c->win);
   1322 	if (term)
   1323 		swallow(term, c);
   1324 	focus(NULL);
   1325 }
   1326 
   1327 void
   1328 mappingnotify(XEvent *e)
   1329 {
   1330 	XMappingEvent *ev = &e->xmapping;
   1331 
   1332 	XRefreshKeyboardMapping(ev);
   1333 	if (ev->request == MappingKeyboard)
   1334 		grabkeys();
   1335 }
   1336 
   1337 void
   1338 maprequest(XEvent *e)
   1339 {
   1340 	static XWindowAttributes wa;
   1341 	XMapRequestEvent *ev = &e->xmaprequest;
   1342 
   1343 	if (!XGetWindowAttributes(dpy, ev->window, &wa))
   1344 		return;
   1345 	if (wa.override_redirect)
   1346 		return;
   1347 	if (!wintoclient(ev->window))
   1348 		manage(ev->window, &wa);
   1349 }
   1350 
   1351 void
   1352 monocle(Monitor *m)
   1353 {
   1354 	unsigned int n = 0;
   1355 	Client *c;
   1356 
   1357 	for (c = m->clients; c; c = c->next)
   1358 		if (ISVISIBLE(c))
   1359 			n++;
   1360 	if (n > 0) /* override layout symbol */
   1361 		snprintf(m->ltsymbol, sizeof m->ltsymbol, "[%d]", n);
   1362 	for (c = nexttiled(m->clients); c; c = nexttiled(c->next))
   1363 		resize(c, m->wx, m->wy, m->ww - 2 * c->bw, m->wh - 2 * c->bw, 0);
   1364 }
   1365 
   1366 void
   1367 motionnotify(XEvent *e)
   1368 {
   1369 	static Monitor *mon = NULL;
   1370 	Monitor *m;
   1371 	XMotionEvent *ev = &e->xmotion;
   1372 
   1373 	if (ev->window != root)
   1374 		return;
   1375 	if ((m = recttomon(ev->x_root, ev->y_root, 1, 1)) != mon && mon) {
   1376 		unfocus(selmon->sel, 1);
   1377 		selmon = m;
   1378 		focus(NULL);
   1379 	}
   1380 	mon = m;
   1381 }
   1382 
   1383 void
   1384 movemouse(const Arg *arg)
   1385 {
   1386 	int x, y, ocx, ocy, nx, ny;
   1387 	Client *c;
   1388 	Monitor *m;
   1389 	XEvent ev;
   1390 	Time lasttime = 0;
   1391 
   1392 	if (!(c = selmon->sel))
   1393 		return;
   1394 	if (c->isfullscreen && c->fakefullscreen != 1) /* no support moving fullscreen windows by mouse */
   1395 		return;
   1396 	restack(selmon);
   1397 	ocx = c->x;
   1398 	ocy = c->y;
   1399 	if (XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
   1400 		None, cursor[CurMove]->cursor, CurrentTime) != GrabSuccess)
   1401 		return;
   1402 	if (!getrootptr(&x, &y))
   1403 		return;
   1404 	do {
   1405 		XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
   1406 		switch(ev.type) {
   1407 		case ConfigureRequest:
   1408 		case Expose:
   1409 		case MapRequest:
   1410 			handler[ev.type](&ev);
   1411 			break;
   1412 		case MotionNotify:
   1413 			if ((ev.xmotion.time - lasttime) <= (1000 / 60))
   1414 				continue;
   1415 			lasttime = ev.xmotion.time;
   1416 
   1417 			nx = ocx + (ev.xmotion.x - x);
   1418 			ny = ocy + (ev.xmotion.y - y);
   1419 			if (abs(selmon->wx - nx) < snap)
   1420 				nx = selmon->wx;
   1421 			else if (abs((selmon->wx + selmon->ww) - (nx + WIDTH(c))) < snap)
   1422 				nx = selmon->wx + selmon->ww - WIDTH(c);
   1423 			if (abs(selmon->wy - ny) < snap)
   1424 				ny = selmon->wy;
   1425 			else if (abs((selmon->wy + selmon->wh) - (ny + HEIGHT(c))) < snap)
   1426 				ny = selmon->wy + selmon->wh - HEIGHT(c);
   1427 			if (!c->isfloating && selmon->lt[selmon->sellt]->arrange
   1428 			&& (abs(nx - c->x) > snap || abs(ny - c->y) > snap))
   1429 				togglefloating(NULL);
   1430 			if (!selmon->lt[selmon->sellt]->arrange || c->isfloating)
   1431 				resize(c, nx, ny, c->w, c->h, 1);
   1432 			break;
   1433 		}
   1434 	} while (ev.type != ButtonRelease);
   1435 	XUngrabPointer(dpy, CurrentTime);
   1436 	if ((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
   1437 		sendmon(c, m);
   1438 		selmon = m;
   1439 		focus(NULL);
   1440 	}
   1441 }
   1442 
   1443 Client *
   1444 nexttiled(Client *c)
   1445 {
   1446 	for (; c && (c->isfloating || !ISVISIBLE(c)); c = c->next);
   1447 	return c;
   1448 }
   1449 
   1450 void
   1451 pop(Client *c)
   1452 {
   1453 	detach(c);
   1454 	attach(c);
   1455 	focus(c);
   1456 	arrange(c->mon);
   1457 }
   1458 
   1459 void
   1460 propertynotify(XEvent *e)
   1461 {
   1462 	Client *c;
   1463 	Window trans;
   1464 	XPropertyEvent *ev = &e->xproperty;
   1465 
   1466 	if ((ev->window == root) && (ev->atom == XA_WM_NAME))
   1467 		updatestatus();
   1468 	else if (ev->state == PropertyDelete)
   1469 		return; /* ignore */
   1470 	else if ((c = wintoclient(ev->window))) {
   1471 		switch(ev->atom) {
   1472 		default: break;
   1473 		case XA_WM_TRANSIENT_FOR:
   1474 			if (!c->isfloating && (XGetTransientForHint(dpy, c->win, &trans)) &&
   1475 				(c->isfloating = (wintoclient(trans)) != NULL))
   1476 				arrange(c->mon);
   1477 			break;
   1478 		case XA_WM_NORMAL_HINTS:
   1479 			updatesizehints(c);
   1480 			break;
   1481 		case XA_WM_HINTS:
   1482 			updatewmhints(c);
   1483 			drawbars();
   1484 			break;
   1485 		}
   1486 		if (ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
   1487 			updatetitle(c);
   1488 			if (c == c->mon->sel)
   1489 				drawbar(c->mon);
   1490 		}
   1491 		if (ev->atom == netatom[NetWMWindowType])
   1492 			updatewindowtype(c);
   1493 	}
   1494 }
   1495 
   1496 void
   1497 pushstack(const Arg *arg) {
   1498 	int i = stackpos(arg);
   1499 	Client *sel = selmon->sel, *c, *p;
   1500 
   1501 	if(i < 0)
   1502 		return;
   1503 	else if(i == 0) {
   1504 		detach(sel);
   1505 		attach(sel);
   1506 	}
   1507 	else {
   1508 		for(p = NULL, c = selmon->clients; c; p = c, c = c->next)
   1509 			if(!(i -= (ISVISIBLE(c) && c != sel)))
   1510 				break;
   1511 		c = c ? c : p;
   1512 		detach(sel);
   1513 		sel->next = c->next;
   1514 		c->next = sel;
   1515 	}
   1516 	arrange(selmon);
   1517 }
   1518 
   1519 void
   1520 quit(const Arg *arg)
   1521 {
   1522 	running = 0;
   1523 }
   1524 
   1525 Monitor *
   1526 recttomon(int x, int y, int w, int h)
   1527 {
   1528 	Monitor *m, *r = selmon;
   1529 	int a, area = 0;
   1530 
   1531 	for (m = mons; m; m = m->next)
   1532 		if ((a = INTERSECT(x, y, w, h, m)) > area) {
   1533 			area = a;
   1534 			r = m;
   1535 		}
   1536 	return r;
   1537 }
   1538 
   1539 void
   1540 resize(Client *c, int x, int y, int w, int h, int interact)
   1541 {
   1542 	if (applysizehints(c, &x, &y, &w, &h, interact))
   1543 		resizeclient(c, x, y, w, h);
   1544 }
   1545 
   1546 void
   1547 resizeclient(Client *c, int x, int y, int w, int h)
   1548 {
   1549 	XWindowChanges wc;
   1550 
   1551 	c->oldx = c->x; c->x = wc.x = x;
   1552 	c->oldy = c->y; c->y = wc.y = y;
   1553 	c->oldw = c->w; c->w = wc.width = w;
   1554 	c->oldh = c->h; c->h = wc.height = h;
   1555 	wc.border_width = c->bw;
   1556 	if (((nexttiled(c->mon->clients) == c && !nexttiled(c->next))
   1557 	    || &monocle == c->mon->lt[c->mon->sellt]->arrange)
   1558 	    && !c->isfullscreen && !c->isfloating
   1559 	    && NULL != c->mon->lt[c->mon->sellt]->arrange) {
   1560 		c->w = wc.width += c->bw * 2;
   1561 		c->h = wc.height += c->bw * 2;
   1562 		wc.border_width = 0;
   1563 	}
   1564 	XConfigureWindow(dpy, c->win, CWX|CWY|CWWidth|CWHeight|CWBorderWidth, &wc);
   1565 	configure(c);
   1566 	if (c->fakefullscreen == 1)
   1567 		XSync(dpy, True);
   1568 	else
   1569 		XSync(dpy, False);
   1570 }
   1571 
   1572 void
   1573 resizemouse(const Arg *arg)
   1574 {
   1575 	int ocx, ocy, nw, nh;
   1576 	Client *c;
   1577 	Monitor *m;
   1578 	XEvent ev;
   1579 	Time lasttime = 0;
   1580 
   1581 	if (!(c = selmon->sel))
   1582 		return;
   1583 	if (c->isfullscreen && c->fakefullscreen != 1) /* no support resizing fullscreen windows by mouse */
   1584 		return;
   1585 	restack(selmon);
   1586 	ocx = c->x;
   1587 	ocy = c->y;
   1588 	if (XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
   1589 		None, cursor[CurResize]->cursor, CurrentTime) != GrabSuccess)
   1590 		return;
   1591 	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
   1592 	do {
   1593 		XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
   1594 		switch(ev.type) {
   1595 		case ConfigureRequest:
   1596 		case Expose:
   1597 		case MapRequest:
   1598 			handler[ev.type](&ev);
   1599 			break;
   1600 		case MotionNotify:
   1601 			if ((ev.xmotion.time - lasttime) <= (1000 / 60))
   1602 				continue;
   1603 			lasttime = ev.xmotion.time;
   1604 
   1605 			nw = MAX(ev.xmotion.x - ocx - 2 * c->bw + 1, 1);
   1606 			nh = MAX(ev.xmotion.y - ocy - 2 * c->bw + 1, 1);
   1607 			if (c->mon->wx + nw >= selmon->wx && c->mon->wx + nw <= selmon->wx + selmon->ww
   1608 			&& c->mon->wy + nh >= selmon->wy && c->mon->wy + nh <= selmon->wy + selmon->wh)
   1609 			{
   1610 				if (!c->isfloating && selmon->lt[selmon->sellt]->arrange
   1611 				&& (abs(nw - c->w) > snap || abs(nh - c->h) > snap))
   1612 					togglefloating(NULL);
   1613 			}
   1614 			if (!selmon->lt[selmon->sellt]->arrange || c->isfloating)
   1615 				resize(c, c->x, c->y, nw, nh, 1);
   1616 			break;
   1617 		}
   1618 	} while (ev.type != ButtonRelease);
   1619 	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
   1620 	XUngrabPointer(dpy, CurrentTime);
   1621 	while (XCheckMaskEvent(dpy, EnterWindowMask, &ev));
   1622 	if ((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
   1623 		sendmon(c, m);
   1624 		selmon = m;
   1625 		focus(NULL);
   1626 	}
   1627 }
   1628 
   1629 void
   1630 restack(Monitor *m)
   1631 {
   1632 	Client *c;
   1633 	XEvent ev;
   1634 	XWindowChanges wc;
   1635 
   1636 	drawbar(m);
   1637 	if (!m->sel)
   1638 		return;
   1639 	if (m->sel->isfloating || !m->lt[m->sellt]->arrange)
   1640 		XRaiseWindow(dpy, m->sel->win);
   1641 	if (m->lt[m->sellt]->arrange) {
   1642 		wc.stack_mode = Below;
   1643 		wc.sibling = m->barwin;
   1644 		for (c = m->stack; c; c = c->snext)
   1645 			if (!c->isfloating && ISVISIBLE(c)) {
   1646 				XConfigureWindow(dpy, c->win, CWSibling|CWStackMode, &wc);
   1647 				wc.sibling = c->win;
   1648 			}
   1649 	}
   1650 	XSync(dpy, False);
   1651 	while (XCheckMaskEvent(dpy, EnterWindowMask, &ev));
   1652 }
   1653 
   1654 void
   1655 run(void)
   1656 {
   1657 	XEvent ev;
   1658 	/* main event loop */
   1659 	XSync(dpy, False);
   1660 	while (running && !XNextEvent(dpy, &ev))
   1661 		if (handler[ev.type])
   1662 			handler[ev.type](&ev); /* call handler */
   1663 }
   1664 
   1665 void
   1666 scan(void)
   1667 {
   1668 	unsigned int i, num;
   1669 	Window d1, d2, *wins = NULL;
   1670 	XWindowAttributes wa;
   1671 
   1672 	if (XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
   1673 		for (i = 0; i < num; i++) {
   1674 			if (!XGetWindowAttributes(dpy, wins[i], &wa)
   1675 			|| wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
   1676 				continue;
   1677 			if (wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
   1678 				manage(wins[i], &wa);
   1679 		}
   1680 		for (i = 0; i < num; i++) { /* now the transients */
   1681 			if (!XGetWindowAttributes(dpy, wins[i], &wa))
   1682 				continue;
   1683 			if (XGetTransientForHint(dpy, wins[i], &d1)
   1684 			&& (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
   1685 				manage(wins[i], &wa);
   1686 		}
   1687 		if (wins)
   1688 			XFree(wins);
   1689 	}
   1690 }
   1691 
   1692 void
   1693 sendmon(Client *c, Monitor *m)
   1694 {
   1695 	if (c->mon == m)
   1696 		return;
   1697 	unfocus(c, 1);
   1698 	detach(c);
   1699 	detachstack(c);
   1700 	c->mon = m;
   1701 	c->tags = m->tagset[m->seltags]; /* assign tags of target monitor */
   1702 	attach(c);
   1703 	attachstack(c);
   1704 	focus(NULL);
   1705 	arrange(NULL);
   1706 }
   1707 
   1708 void
   1709 setclientstate(Client *c, long state)
   1710 {
   1711 	long data[] = { state, None };
   1712 
   1713 	XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
   1714 		PropModeReplace, (unsigned char *)data, 2);
   1715 }
   1716 
   1717 int
   1718 sendevent(Client *c, Atom proto)
   1719 {
   1720 	int n;
   1721 	Atom *protocols;
   1722 	int exists = 0;
   1723 	XEvent ev;
   1724 
   1725 	if (XGetWMProtocols(dpy, c->win, &protocols, &n)) {
   1726 		while (!exists && n--)
   1727 			exists = protocols[n] == proto;
   1728 		XFree(protocols);
   1729 	}
   1730 	if (exists) {
   1731 		ev.type = ClientMessage;
   1732 		ev.xclient.window = c->win;
   1733 		ev.xclient.message_type = wmatom[WMProtocols];
   1734 		ev.xclient.format = 32;
   1735 		ev.xclient.data.l[0] = proto;
   1736 		ev.xclient.data.l[1] = CurrentTime;
   1737 		XSendEvent(dpy, c->win, False, NoEventMask, &ev);
   1738 	}
   1739 	return exists;
   1740 }
   1741 
   1742 void
   1743 setfocus(Client *c)
   1744 {
   1745 	if (!c->neverfocus) {
   1746 		XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
   1747 		XChangeProperty(dpy, root, netatom[NetActiveWindow],
   1748 			XA_WINDOW, 32, PropModeReplace,
   1749 			(unsigned char *) &(c->win), 1);
   1750 	}
   1751 	sendevent(c, wmatom[WMTakeFocus]);
   1752 }
   1753 
   1754 void
   1755 setfullscreen(Client *c, int fullscreen)
   1756 {
   1757 	if (fullscreen && !c->isfullscreen) {
   1758 		XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
   1759 			PropModeReplace, (unsigned char*)&netatom[NetWMFullscreen], 1);
   1760 		c->isfullscreen = 1;
   1761 		c->oldbw = c->bw;
   1762 		if (c->fakefullscreen == 1)
   1763 			return;
   1764 		c->oldstate = c->isfloating;
   1765 		c->bw = 0;
   1766 		c->isfloating = 1;
   1767 		resizeclient(c, c->mon->mx, c->mon->my, c->mon->mw, c->mon->mh);
   1768 		XRaiseWindow(dpy, c->win);
   1769 	} else if (!fullscreen && c->isfullscreen){
   1770 		XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
   1771 			PropModeReplace, (unsigned char*)0, 0);
   1772 		c->isfullscreen = 0;
   1773 		c->bw = c->oldbw;
   1774 		if (c->fakefullscreen == 1)
   1775 			return;
   1776 		if (c->fakefullscreen == 2)
   1777 			c->fakefullscreen = 1;
   1778 		c->isfloating = c->oldstate;
   1779 		c->x = c->oldx;
   1780 		c->y = c->oldy;
   1781 		c->w = c->oldw;
   1782 		c->h = c->oldh;
   1783 		resizeclient(c, c->x, c->y, c->w, c->h);
   1784 		arrange(c->mon);
   1785 	}
   1786 }
   1787 
   1788 void
   1789 setlayout(const Arg *arg)
   1790 {
   1791 	if (!arg || !arg->v || arg->v != selmon->lt[selmon->sellt])
   1792 		selmon->sellt = selmon->pertag->sellts[selmon->pertag->curtag] ^= 1;
   1793 	if (arg && arg->v)
   1794 		selmon->lt[selmon->sellt] = selmon->pertag->ltidxs[selmon->pertag->curtag][selmon->sellt] = (Layout *)arg->v;
   1795 	strncpy(selmon->ltsymbol, selmon->lt[selmon->sellt]->symbol, sizeof selmon->ltsymbol);
   1796 	if (selmon->sel)
   1797 		arrange(selmon);
   1798 	else
   1799 		drawbar(selmon);
   1800 }
   1801 
   1802 /* arg > 1.0 will set mfact absolutely */
   1803 void
   1804 setmfact(const Arg *arg)
   1805 {
   1806 	float f;
   1807 
   1808 	if (!arg || !selmon->lt[selmon->sellt]->arrange)
   1809 		return;
   1810 	f = arg->f < 1.0 ? arg->f + selmon->mfact : arg->f - 1.0;
   1811 	if (f < 0.05 || f > 0.95)
   1812 		return;
   1813 	selmon->mfact = selmon->pertag->mfacts[selmon->pertag->curtag] = f;
   1814 	arrange(selmon);
   1815 }
   1816 
   1817 void no_swallow_next(int signum, siginfo_t *si, void *ucontext)
   1818 {
   1819 	swallow_next = 0;
   1820 }
   1821 
   1822 void
   1823 setup(void)
   1824 {
   1825 	int i;
   1826 	XSetWindowAttributes wa;
   1827 	Atom utf8string;
   1828 
   1829 	/* clean up any zombies immediately */
   1830 	sigchld(0);
   1831 
   1832 	/* init screen */
   1833 	screen = DefaultScreen(dpy);
   1834 	sw = DisplayWidth(dpy, screen);
   1835 	sh = DisplayHeight(dpy, screen);
   1836 	root = RootWindow(dpy, screen);
   1837 	drw = drw_create(dpy, screen, root, sw, sh);
   1838 	if (!drw_fontset_create(drw, fonts, LENGTH(fonts)))
   1839 		die("no fonts could be loaded.");
   1840 	lrpad = drw->fonts->h;
   1841 	bh = drw->fonts->h + 2;
   1842 	updategeom();
   1843 	/* init atoms */
   1844 	utf8string = XInternAtom(dpy, "UTF8_STRING", False);
   1845 	wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
   1846 	wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
   1847 	wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
   1848 	wmatom[WMTakeFocus] = XInternAtom(dpy, "WM_TAKE_FOCUS", False);
   1849 	netatom[NetActiveWindow] = XInternAtom(dpy, "_NET_ACTIVE_WINDOW", False);
   1850 	netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
   1851 	netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
   1852 	netatom[NetWMState] = XInternAtom(dpy, "_NET_WM_STATE", False);
   1853 	netatom[NetWMCheck] = XInternAtom(dpy, "_NET_SUPPORTING_WM_CHECK", False);
   1854 	netatom[NetWMFullscreen] = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);
   1855 	netatom[NetWMWindowType] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE", False);
   1856 	netatom[NetWMWindowTypeDialog] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE_DIALOG", False);
   1857 	netatom[NetClientList] = XInternAtom(dpy, "_NET_CLIENT_LIST", False);
   1858 	/* init cursors */
   1859 	cursor[CurNormal] = drw_cur_create(drw, XC_left_ptr);
   1860 	cursor[CurResize] = drw_cur_create(drw, XC_sizing);
   1861 	cursor[CurMove] = drw_cur_create(drw, XC_fleur);
   1862 	/* init appearance */
   1863 	scheme = ecalloc(LENGTH(colors), sizeof(Clr *));
   1864 	for (i = 0; i < LENGTH(colors); i++)
   1865 		scheme[i] = drw_scm_create(drw, colors[i], 3);
   1866 	/* init bars */
   1867 	updatebars();
   1868 	updatestatus();
   1869 	/* supporting window for NetWMCheck */
   1870 	wmcheckwin = XCreateSimpleWindow(dpy, root, 0, 0, 1, 1, 0, 0, 0);
   1871 	XChangeProperty(dpy, wmcheckwin, netatom[NetWMCheck], XA_WINDOW, 32,
   1872 		PropModeReplace, (unsigned char *) &wmcheckwin, 1);
   1873 	XChangeProperty(dpy, wmcheckwin, netatom[NetWMName], utf8string, 8,
   1874 		PropModeReplace, (unsigned char *) "dwm", 3);
   1875 	XChangeProperty(dpy, root, netatom[NetWMCheck], XA_WINDOW, 32,
   1876 		PropModeReplace, (unsigned char *) &wmcheckwin, 1);
   1877 	/* EWMH support per view */
   1878 	XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
   1879 		PropModeReplace, (unsigned char *) netatom, NetLast);
   1880 	XDeleteProperty(dpy, root, netatom[NetClientList]);
   1881 	/* select events */
   1882 	wa.cursor = cursor[CurNormal]->cursor;
   1883 	wa.event_mask = SubstructureRedirectMask|SubstructureNotifyMask
   1884 		|ButtonPressMask|PointerMotionMask|EnterWindowMask
   1885 		|LeaveWindowMask|StructureNotifyMask|PropertyChangeMask;
   1886 	XChangeWindowAttributes(dpy, root, CWEventMask|CWCursor, &wa);
   1887 	XSelectInput(dpy, root, wa.event_mask);
   1888 	grabkeys();
   1889 	focus(NULL);
   1890 
   1891 	struct sigaction sa = {
   1892 		.sa_sigaction = no_swallow_next,
   1893 		.sa_flags = SA_SIGINFO,
   1894 	};
   1895 	sigaction(SIGRTMIN+69, &sa, NULL);
   1896 }
   1897 
   1898 
   1899 void
   1900 seturgent(Client *c, int urg)
   1901 {
   1902 	XWMHints *wmh;
   1903 
   1904 	c->isurgent = urg;
   1905 	if (!(wmh = XGetWMHints(dpy, c->win)))
   1906 		return;
   1907 	wmh->flags = urg ? (wmh->flags | XUrgencyHint) : (wmh->flags & ~XUrgencyHint);
   1908 	XSetWMHints(dpy, c->win, wmh);
   1909 	XFree(wmh);
   1910 }
   1911 
   1912 void
   1913 showhide(Client *c)
   1914 {
   1915 	if (!c)
   1916 		return;
   1917 	if (ISVISIBLE(c)) {
   1918 		/* show clients top down */
   1919 		XMoveWindow(dpy, c->win, c->x, c->y);
   1920 		if ((!c->mon->lt[c->mon->sellt]->arrange || c->isfloating) && !c->isfullscreen)
   1921 			resize(c, c->x, c->y, c->w, c->h, 0);
   1922 		showhide(c->snext);
   1923 	} else {
   1924 		/* hide clients bottom up */
   1925 		showhide(c->snext);
   1926 		XMoveWindow(dpy, c->win, WIDTH(c) * -2, c->y);
   1927 	}
   1928 }
   1929 
   1930 void
   1931 sigchld(int unused)
   1932 {
   1933 	if (signal(SIGCHLD, sigchld) == SIG_ERR)
   1934 		die("can't install SIGCHLD handler:");
   1935 	while (0 < waitpid(-1, NULL, WNOHANG));
   1936 }
   1937 
   1938 void
   1939 sigstatusbar(const Arg *arg)
   1940 {
   1941   union sigval sv;
   1942 
   1943   if (!statussig)
   1944     return;
   1945   sv.sival_int = arg->i;
   1946   if ((statuspid = getstatusbarpid()) <= 0)
   1947     return;
   1948 
   1949   sigqueue(statuspid, SIGRTMIN+statussig, sv);
   1950 }
   1951 
   1952 void
   1953 spawn(const Arg *arg)
   1954 {
   1955 	if (arg->v == dmenucmd)
   1956 		dmenumon[0] = '0' + selmon->num;
   1957 	selmon->tagset[selmon->seltags] &= ~scratchtag;
   1958 	if (fork() == 0) {
   1959 		if (dpy)
   1960 			close(ConnectionNumber(dpy));
   1961 		setsid();
   1962 		execvp(((char **)arg->v)[0], (char **)arg->v);
   1963 		fprintf(stderr, "dwm: execvp %s", ((char **)arg->v)[0]);
   1964 		perror(" failed");
   1965 		exit(EXIT_SUCCESS);
   1966 	}
   1967 }
   1968 
   1969 int
   1970 stackpos(const Arg *arg) {
   1971 	int n, i;
   1972 	Client *c, *l;
   1973 
   1974 	if(!selmon->clients)
   1975 		return -1;
   1976 
   1977 	if(arg->i == PREVSEL) {
   1978 		for(l = selmon->stack; l && (!ISVISIBLE(l) || l == selmon->sel); l = l->snext);
   1979 		if(!l)
   1980 			return -1;
   1981 		for(i = 0, c = selmon->clients; c != l; i += ISVISIBLE(c) ? 1 : 0, c = c->next);
   1982 		return i;
   1983 	}
   1984 	else if(ISINC(arg->i)) {
   1985 		if(!selmon->sel)
   1986 			return -1;
   1987 		for(i = 0, c = selmon->clients; c != selmon->sel; i += ISVISIBLE(c) ? 1 : 0, c = c->next);
   1988 		for(n = i; c; n += ISVISIBLE(c) ? 1 : 0, c = c->next);
   1989 		return MOD(i + GETINC(arg->i), n);
   1990 	}
   1991 	else if(arg->i < 0) {
   1992 		for(i = 0, c = selmon->clients; c; i += ISVISIBLE(c) ? 1 : 0, c = c->next);
   1993 		return MAX(i + arg->i, 0);
   1994 	}
   1995 	else
   1996 		return arg->i;
   1997 }
   1998 
   1999 void
   2000 tag(const Arg *arg)
   2001 {
   2002 	if (selmon->sel && arg->ui & TAGMASK) {
   2003 		selmon->sel->tags = arg->ui & TAGMASK;
   2004 		focus(NULL);
   2005 		arrange(selmon);
   2006 	}
   2007 }
   2008 
   2009 void
   2010 tagmon(const Arg *arg)
   2011 {
   2012 	if (!selmon->sel || !mons->next)
   2013 		return;
   2014 	sendmon(selmon->sel, dirtomon(arg->i));
   2015 }
   2016 
   2017 void
   2018 togglebar(const Arg *arg)
   2019 {
   2020 	selmon->showbar = selmon->pertag->showbars[selmon->pertag->curtag] = !selmon->showbar;
   2021 	updatebarpos(selmon);
   2022 	XMoveResizeWindow(dpy, selmon->barwin, selmon->wx, selmon->by, selmon->ww, bh);
   2023 	arrange(selmon);
   2024 }
   2025 
   2026 void
   2027 togglefakefullscreen(const Arg *arg)
   2028 {
   2029 	Client *c = selmon->sel;
   2030 	if (!c)
   2031 		return;
   2032 
   2033 	if (c->fakefullscreen) {
   2034 		if (c->isfullscreen) {
   2035 			if (c->isfloating && c->fakefullscreen == 1) {
   2036 				c->oldstate = c->isfloating;
   2037 				c->oldx = c->x;
   2038 				c->oldy = c->y;
   2039 				c->oldw = c->w;
   2040 				c->oldh = c->h;
   2041 			}
   2042 			c->fakefullscreen = 0;
   2043 		}
   2044 		else
   2045 			c->isfullscreen = 0;
   2046 	} else {
   2047 		c->fakefullscreen = 1;
   2048 		if (c->isfullscreen) {
   2049 			c->isfloating = c->oldstate;
   2050 			c->bw = c->oldbw;
   2051 			c->x = c->oldx;
   2052 			c->y = c->oldy;
   2053 			c->w = c->oldw;
   2054 			c->h = c->oldh;
   2055 			resizeclient(c, c->x, c->y, c->w, c->h);
   2056 		}
   2057 		c->isfullscreen = 0;
   2058 	}
   2059 	setfullscreen(c, !c->isfullscreen);
   2060 }
   2061 
   2062 void
   2063 togglefloating(const Arg *arg)
   2064 {
   2065 	if (!selmon->sel)
   2066 		return;
   2067 	if (selmon->sel->isfullscreen && selmon->sel->fakefullscreen != 1) /* no support for fullscreen windows */
   2068 		return;
   2069 	selmon->sel->isfloating = !selmon->sel->isfloating || selmon->sel->isfixed;
   2070 	if (selmon->sel->isfloating)
   2071 		resize(selmon->sel, selmon->sel->x, selmon->sel->y,
   2072 			selmon->sel->w, selmon->sel->h, 0);
   2073 	arrange(selmon);
   2074 }
   2075 
   2076 void
   2077 togglefullscr(const Arg *arg)
   2078 {
   2079   if(selmon->sel)
   2080     setfullscreen(selmon->sel, !selmon->sel->isfullscreen);
   2081 }
   2082 
   2083 void
   2084 togglescratch(const Arg *arg)
   2085 {
   2086 	Client *c;
   2087 	unsigned int found = 0;
   2088 
   2089 	for (c = selmon->clients; c && !(found = c->tags & scratchtag); c = c->next);
   2090 	if (found) {
   2091 		unsigned int newtagset = selmon->tagset[selmon->seltags] ^ scratchtag;
   2092 		if (newtagset) {
   2093 			selmon->tagset[selmon->seltags] = newtagset;
   2094 			focus(NULL);
   2095 			arrange(selmon);
   2096 		}
   2097 		if (ISVISIBLE(c)) {
   2098 			focus(c);
   2099 			restack(selmon);
   2100 		}
   2101 	} else
   2102 		spawn(arg);
   2103 }
   2104 
   2105 void
   2106 togglesticky(const Arg *arg)
   2107 {
   2108 	if (!selmon->sel)
   2109 		return;
   2110 	selmon->sel->issticky = !selmon->sel->issticky;
   2111 	arrange(selmon);
   2112 }
   2113 
   2114 void
   2115 toggletag(const Arg *arg)
   2116 {
   2117 	unsigned int newtags;
   2118 
   2119 	if (!selmon->sel)
   2120 		return;
   2121 	newtags = selmon->sel->tags ^ (arg->ui & TAGMASK);
   2122 	if (newtags) {
   2123 		selmon->sel->tags = newtags;
   2124 		focus(NULL);
   2125 		arrange(selmon);
   2126 	}
   2127 }
   2128 
   2129 void
   2130 toggletagscratch(const Arg *arg)
   2131 {
   2132 	if (!selmon->sel)
   2133 		return;
   2134 	if (selmon->sel->tags == scratchtag)
   2135 		selmon->sel->tags = selmon->pertag->curtag;
   2136 	else
   2137 		selmon->sel->tags = scratchtag;
   2138 
   2139 	focus(NULL);
   2140 	arrange(selmon);
   2141 }
   2142 
   2143 void
   2144 toggleview(const Arg *arg)
   2145 {
   2146 	unsigned int newtagset = selmon->tagset[selmon->seltags] ^ (arg->ui & TAGMASK);
   2147 	int i;
   2148 
   2149 	if (newtagset) {
   2150 		selmon->tagset[selmon->seltags] = newtagset;
   2151 
   2152 		if (newtagset == ~0) {
   2153 			selmon->pertag->prevtag = selmon->pertag->curtag;
   2154 			selmon->pertag->curtag = 0;
   2155 		}
   2156 
   2157 		/* test if the user did not select the same tag */
   2158 		if (!(newtagset & 1 << (selmon->pertag->curtag - 1))) {
   2159 			selmon->pertag->prevtag = selmon->pertag->curtag;
   2160 			for (i = 0; !(newtagset & 1 << i); i++) ;
   2161 			selmon->pertag->curtag = i + 1;
   2162 		}
   2163 
   2164 		/* apply settings for this view */
   2165 		selmon->nmaster = selmon->pertag->nmasters[selmon->pertag->curtag];
   2166 		selmon->mfact = selmon->pertag->mfacts[selmon->pertag->curtag];
   2167 		selmon->sellt = selmon->pertag->sellts[selmon->pertag->curtag];
   2168 		selmon->lt[selmon->sellt] = selmon->pertag->ltidxs[selmon->pertag->curtag][selmon->sellt];
   2169 		selmon->lt[selmon->sellt^1] = selmon->pertag->ltidxs[selmon->pertag->curtag][selmon->sellt^1];
   2170 
   2171 		if (selmon->showbar != selmon->pertag->showbars[selmon->pertag->curtag])
   2172 			togglebar(NULL);
   2173 
   2174 		focus(NULL);
   2175 		arrange(selmon);
   2176 	}
   2177 }
   2178 
   2179 void
   2180 unfocus(Client *c, int setfocus)
   2181 {
   2182 	if (!c)
   2183 		return;
   2184 	grabbuttons(c, 0);
   2185 	XSetWindowBorder(dpy, c->win, scheme[SchemeNorm][ColBorder].pixel);
   2186 	if (setfocus) {
   2187 		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
   2188 		XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
   2189 	}
   2190 }
   2191 
   2192 void
   2193 unmanage(Client *c, int destroyed)
   2194 {
   2195 	Monitor *m = c->mon;
   2196 	XWindowChanges wc;
   2197 
   2198 	if (c->swallowing) {
   2199 		unswallow(c);
   2200 		return;
   2201 	}
   2202 
   2203 	Client *s = swallowingclient(c->win);
   2204 	if (s) {
   2205 		free(s->swallowing);
   2206 		s->swallowing = NULL;
   2207 		arrange(m);
   2208 		focus(NULL);
   2209 		return;
   2210 	}
   2211 
   2212 	detach(c);
   2213 	detachstack(c);
   2214 	if (!destroyed) {
   2215 		wc.border_width = c->oldbw;
   2216 		XGrabServer(dpy); /* avoid race conditions */
   2217 		XSetErrorHandler(xerrordummy);
   2218 		XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
   2219 		XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
   2220 		setclientstate(c, WithdrawnState);
   2221 		XSync(dpy, False);
   2222 		XSetErrorHandler(xerror);
   2223 		XUngrabServer(dpy);
   2224 	}
   2225 	free(c);
   2226 
   2227 	if (!s) {
   2228 		arrange(m);
   2229 		focus(NULL);
   2230 		updateclientlist();
   2231 	}
   2232 }
   2233 
   2234 void
   2235 unmapnotify(XEvent *e)
   2236 {
   2237 	Client *c;
   2238 	XUnmapEvent *ev = &e->xunmap;
   2239 
   2240 	if ((c = wintoclient(ev->window))) {
   2241 		if (ev->send_event)
   2242 			setclientstate(c, WithdrawnState);
   2243 		else
   2244 			unmanage(c, 0);
   2245 	}
   2246 }
   2247 
   2248 void
   2249 updatebars(void)
   2250 {
   2251 	Monitor *m;
   2252 	XSetWindowAttributes wa = {
   2253 		.override_redirect = True,
   2254 		.background_pixmap = ParentRelative,
   2255 		.event_mask = ButtonPressMask|ExposureMask
   2256 	};
   2257 	XClassHint ch = {"dwm", "dwm"};
   2258 	for (m = mons; m; m = m->next) {
   2259 		if (m->barwin)
   2260 			continue;
   2261 		m->barwin = XCreateWindow(dpy, root, m->wx, m->by, m->ww, bh, 0, DefaultDepth(dpy, screen),
   2262 				CopyFromParent, DefaultVisual(dpy, screen),
   2263 				CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
   2264 		XDefineCursor(dpy, m->barwin, cursor[CurNormal]->cursor);
   2265 		XMapRaised(dpy, m->barwin);
   2266 		XSetClassHint(dpy, m->barwin, &ch);
   2267 	}
   2268 }
   2269 
   2270 void
   2271 updatebarpos(Monitor *m)
   2272 {
   2273 	m->wy = m->my;
   2274 	m->wh = m->mh;
   2275 	if (m->showbar) {
   2276 		m->wh -= bh;
   2277 		m->by = m->topbar ? m->wy : m->wy + m->wh;
   2278 		m->wy = m->topbar ? m->wy + bh : m->wy;
   2279 	} else
   2280 		m->by = -bh;
   2281 }
   2282 
   2283 void
   2284 updateclientlist()
   2285 {
   2286 	Client *c;
   2287 	Monitor *m;
   2288 
   2289 	XDeleteProperty(dpy, root, netatom[NetClientList]);
   2290 	for (m = mons; m; m = m->next)
   2291 		for (c = m->clients; c; c = c->next)
   2292 			XChangeProperty(dpy, root, netatom[NetClientList],
   2293 				XA_WINDOW, 32, PropModeAppend,
   2294 				(unsigned char *) &(c->win), 1);
   2295 }
   2296 
   2297 int
   2298 updategeom(void)
   2299 {
   2300 	int dirty = 0;
   2301 
   2302 #ifdef XINERAMA
   2303 	if (XineramaIsActive(dpy)) {
   2304 		int i, j, n, nn;
   2305 		Client *c;
   2306 		Monitor *m;
   2307 		XineramaScreenInfo *info = XineramaQueryScreens(dpy, &nn);
   2308 		XineramaScreenInfo *unique = NULL;
   2309 
   2310 		for (n = 0, m = mons; m; m = m->next, n++);
   2311 		/* only consider unique geometries as separate screens */
   2312 		unique = ecalloc(nn, sizeof(XineramaScreenInfo));
   2313 		for (i = 0, j = 0; i < nn; i++)
   2314 			if (isuniquegeom(unique, j, &info[i]))
   2315 				memcpy(&unique[j++], &info[i], sizeof(XineramaScreenInfo));
   2316 		XFree(info);
   2317 		nn = j;
   2318 		if (n <= nn) { /* new monitors available */
   2319 			for (i = 0; i < (nn - n); i++) {
   2320 				for (m = mons; m && m->next; m = m->next);
   2321 				if (m)
   2322 					m->next = createmon();
   2323 				else
   2324 					mons = createmon();
   2325 			}
   2326 			for (i = 0, m = mons; i < nn && m; m = m->next, i++)
   2327 				if (i >= n
   2328 				|| unique[i].x_org != m->mx || unique[i].y_org != m->my
   2329 				|| unique[i].width != m->mw || unique[i].height != m->mh)
   2330 				{
   2331 					dirty = 1;
   2332 					m->num = i;
   2333 					m->mx = m->wx = unique[i].x_org;
   2334 					m->my = m->wy = unique[i].y_org;
   2335 					m->mw = m->ww = unique[i].width;
   2336 					m->mh = m->wh = unique[i].height;
   2337 					updatebarpos(m);
   2338 				}
   2339 		} else { /* less monitors available nn < n */
   2340 			for (i = nn; i < n; i++) {
   2341 				for (m = mons; m && m->next; m = m->next);
   2342 				while ((c = m->clients)) {
   2343 					dirty = 1;
   2344 					m->clients = c->next;
   2345 					detachstack(c);
   2346 					c->mon = mons;
   2347 					attach(c);
   2348 					attachstack(c);
   2349 				}
   2350 				if (m == selmon)
   2351 					selmon = mons;
   2352 				cleanupmon(m);
   2353 			}
   2354 		}
   2355 		free(unique);
   2356 	} else
   2357 #endif /* XINERAMA */
   2358 	{ /* default monitor setup */
   2359 		if (!mons)
   2360 			mons = createmon();
   2361 		if (mons->mw != sw || mons->mh != sh) {
   2362 			dirty = 1;
   2363 			mons->mw = mons->ww = sw;
   2364 			mons->mh = mons->wh = sh;
   2365 			updatebarpos(mons);
   2366 		}
   2367 	}
   2368 	if (dirty) {
   2369 		selmon = mons;
   2370 		selmon = wintomon(root);
   2371 	}
   2372 	return dirty;
   2373 }
   2374 
   2375 void
   2376 updatenumlockmask(void)
   2377 {
   2378 	unsigned int i, j;
   2379 	XModifierKeymap *modmap;
   2380 
   2381 	numlockmask = 0;
   2382 	modmap = XGetModifierMapping(dpy);
   2383 	for (i = 0; i < 8; i++)
   2384 		for (j = 0; j < modmap->max_keypermod; j++)
   2385 			if (modmap->modifiermap[i * modmap->max_keypermod + j]
   2386 				== XKeysymToKeycode(dpy, XK_Num_Lock))
   2387 				numlockmask = (1 << i);
   2388 	XFreeModifiermap(modmap);
   2389 }
   2390 
   2391 void
   2392 updatesizehints(Client *c)
   2393 {
   2394 	long msize;
   2395 	XSizeHints size;
   2396 
   2397 	if (!XGetWMNormalHints(dpy, c->win, &size, &msize))
   2398 		/* size is uninitialized, ensure that size.flags aren't used */
   2399 		size.flags = PSize;
   2400 	if (size.flags & PBaseSize) {
   2401 		c->basew = size.base_width;
   2402 		c->baseh = size.base_height;
   2403 	} else if (size.flags & PMinSize) {
   2404 		c->basew = size.min_width;
   2405 		c->baseh = size.min_height;
   2406 	} else
   2407 		c->basew = c->baseh = 0;
   2408 	if (size.flags & PResizeInc) {
   2409 		c->incw = size.width_inc;
   2410 		c->inch = size.height_inc;
   2411 	} else
   2412 		c->incw = c->inch = 0;
   2413 	if (size.flags & PMaxSize) {
   2414 		c->maxw = size.max_width;
   2415 		c->maxh = size.max_height;
   2416 	} else
   2417 		c->maxw = c->maxh = 0;
   2418 	if (size.flags & PMinSize) {
   2419 		c->minw = size.min_width;
   2420 		c->minh = size.min_height;
   2421 	} else if (size.flags & PBaseSize) {
   2422 		c->minw = size.base_width;
   2423 		c->minh = size.base_height;
   2424 	} else
   2425 		c->minw = c->minh = 0;
   2426 	if (size.flags & PAspect) {
   2427 		c->mina = (float)size.min_aspect.y / size.min_aspect.x;
   2428 		c->maxa = (float)size.max_aspect.x / size.max_aspect.y;
   2429 	} else
   2430 		c->maxa = c->mina = 0.0;
   2431 	c->isfixed = (c->maxw && c->maxh && c->maxw == c->minw && c->maxh == c->minh);
   2432 }
   2433 
   2434 void
   2435 updatestatus(void)
   2436 {
   2437 	if (!gettextprop(root, XA_WM_NAME, stext, sizeof(stext))) {
   2438 		strcpy(stext, "dwm-"VERSION);
   2439 		statusw = TEXTW(stext) - lrpad + 2;
   2440         } else {
   2441           char *text, *s, ch;
   2442 
   2443           statusw = 0;
   2444           for (text = s = stext; *s; s++) {
   2445             if ((unsigned char)(*s) < ' ') {
   2446               ch = *s;
   2447               *s = '\0';
   2448               statusw += TEXTW(text) - lrpad;
   2449               *s = ch;
   2450               text = s + 1;
   2451             }
   2452           }
   2453           statusw += TEXTW(text) - lrpad + 2;
   2454         }
   2455 	drawbar(selmon);
   2456 }
   2457 
   2458 void
   2459 updatetitle(Client *c)
   2460 {
   2461 	if (!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
   2462 		gettextprop(c->win, XA_WM_NAME, c->name, sizeof c->name);
   2463 	if (c->name[0] == '\0') /* hack to mark broken clients */
   2464 		strcpy(c->name, broken);
   2465 }
   2466 
   2467 void
   2468 updatewindowtype(Client *c)
   2469 {
   2470 	Atom state = getatomprop(c, netatom[NetWMState]);
   2471 	Atom wtype = getatomprop(c, netatom[NetWMWindowType]);
   2472 
   2473 	if (state == netatom[NetWMFullscreen])
   2474 		setfullscreen(c, 1);
   2475 	if (wtype == netatom[NetWMWindowTypeDialog])
   2476 		c->isfloating = 1;
   2477 }
   2478 
   2479 void
   2480 updatewmhints(Client *c)
   2481 {
   2482 	XWMHints *wmh;
   2483 
   2484 	if ((wmh = XGetWMHints(dpy, c->win))) {
   2485 		if (c == selmon->sel && wmh->flags & XUrgencyHint) {
   2486 			wmh->flags &= ~XUrgencyHint;
   2487 			XSetWMHints(dpy, c->win, wmh);
   2488 		} else
   2489 			c->isurgent = (wmh->flags & XUrgencyHint) ? 1 : 0;
   2490 		if (wmh->flags & InputHint)
   2491 			c->neverfocus = !wmh->input;
   2492 		else
   2493 			c->neverfocus = 0;
   2494 		XFree(wmh);
   2495 	}
   2496 }
   2497 
   2498 void
   2499 view(const Arg *arg)
   2500 {
   2501 	int i;
   2502 	unsigned int tmptag;
   2503 
   2504 	if ((arg->ui & TAGMASK) == selmon->tagset[selmon->seltags])
   2505 		return;
   2506 	selmon->seltags ^= 1; /* toggle sel tagset */
   2507 	if (arg->ui & TAGMASK) {
   2508 		selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
   2509 		selmon->pertag->prevtag = selmon->pertag->curtag;
   2510 
   2511 		if (arg->ui == ~0)
   2512 			selmon->pertag->curtag = 0;
   2513 		else {
   2514 			for (i = 0; !(arg->ui & 1 << i); i++) ;
   2515 			selmon->pertag->curtag = i + 1;
   2516 		}
   2517 	} else {
   2518 		tmptag = selmon->pertag->prevtag;
   2519 		selmon->pertag->prevtag = selmon->pertag->curtag;
   2520 		selmon->pertag->curtag = tmptag;
   2521 	}
   2522 
   2523 	selmon->nmaster = selmon->pertag->nmasters[selmon->pertag->curtag];
   2524 	selmon->mfact = selmon->pertag->mfacts[selmon->pertag->curtag];
   2525 	selmon->sellt = selmon->pertag->sellts[selmon->pertag->curtag];
   2526 	selmon->lt[selmon->sellt] = selmon->pertag->ltidxs[selmon->pertag->curtag][selmon->sellt];
   2527 	selmon->lt[selmon->sellt^1] = selmon->pertag->ltidxs[selmon->pertag->curtag][selmon->sellt^1];
   2528 
   2529 	if (selmon->showbar != selmon->pertag->showbars[selmon->pertag->curtag])
   2530 		togglebar(NULL);
   2531 
   2532 	focus(NULL);
   2533 	arrange(selmon);
   2534 }
   2535 
   2536 pid_t
   2537 winpid(Window w)
   2538 {
   2539 
   2540 	pid_t result = 0;
   2541 
   2542 #ifdef __linux__
   2543 	xcb_res_client_id_spec_t spec = {0};
   2544 	spec.client = w;
   2545 	spec.mask = XCB_RES_CLIENT_ID_MASK_LOCAL_CLIENT_PID;
   2546 
   2547 	xcb_generic_error_t *e = NULL;
   2548 	xcb_res_query_client_ids_cookie_t c = xcb_res_query_client_ids(xcon, 1, &spec);
   2549 	xcb_res_query_client_ids_reply_t *r = xcb_res_query_client_ids_reply(xcon, c, &e);
   2550 
   2551 	if (!r)
   2552 		return (pid_t)0;
   2553 
   2554 	xcb_res_client_id_value_iterator_t i = xcb_res_query_client_ids_ids_iterator(r);
   2555 	for (; i.rem; xcb_res_client_id_value_next(&i)) {
   2556 		spec = i.data->spec;
   2557 		if (spec.mask & XCB_RES_CLIENT_ID_MASK_LOCAL_CLIENT_PID) {
   2558 			uint32_t *t = xcb_res_client_id_value_value(i.data);
   2559 			result = *t;
   2560 			break;
   2561 		}
   2562 	}
   2563 
   2564 	free(r);
   2565 
   2566 	if (result == (pid_t)-1)
   2567 		result = 0;
   2568 
   2569 #endif /* __linux__ */
   2570 
   2571 #ifdef __OpenBSD__
   2572         Atom type;
   2573         int format;
   2574         unsigned long len, bytes;
   2575         unsigned char *prop;
   2576         pid_t ret;
   2577 
   2578         if (XGetWindowProperty(dpy, w, XInternAtom(dpy, "_NET_WM_PID", 0), 0, 1, False, AnyPropertyType, &type, &format, &len, &bytes, &prop) != Success || !prop)
   2579                return 0;
   2580 
   2581         ret = *(pid_t*)prop;
   2582         XFree(prop);
   2583         result = ret;
   2584 
   2585 #endif /* __OpenBSD__ */
   2586 	return result;
   2587 }
   2588 
   2589 pid_t
   2590 getparentprocess(pid_t p)
   2591 {
   2592 	unsigned int v = 0;
   2593 
   2594 #ifdef __linux__
   2595 	FILE *f;
   2596 	char buf[256];
   2597 	snprintf(buf, sizeof(buf) - 1, "/proc/%u/stat", (unsigned)p);
   2598 
   2599 	if (!(f = fopen(buf, "r")))
   2600 		return 0;
   2601 
   2602 	fscanf(f, "%*u %*s %*c %u", &v);
   2603 	fclose(f);
   2604 #endif /* __linux__*/
   2605 
   2606 #ifdef __OpenBSD__
   2607 	int n;
   2608 	kvm_t *kd;
   2609 	struct kinfo_proc *kp;
   2610 
   2611 	kd = kvm_openfiles(NULL, NULL, NULL, KVM_NO_FILES, NULL);
   2612 	if (!kd)
   2613 		return 0;
   2614 
   2615 	kp = kvm_getprocs(kd, KERN_PROC_PID, p, sizeof(*kp), &n);
   2616 	v = kp->p_ppid;
   2617 #endif /* __OpenBSD__ */
   2618 
   2619 	return (pid_t)v;
   2620 }
   2621 
   2622 int
   2623 isdescprocess(pid_t p, pid_t c)
   2624 {
   2625 	while (p != c && c != 0)
   2626 		c = getparentprocess(c);
   2627 
   2628 	return (int)c;
   2629 }
   2630 
   2631 Client *
   2632 termforwin(const Client *w)
   2633 {
   2634 	Client *c;
   2635 	Monitor *m;
   2636 
   2637 	if (!w->pid || w->isterminal)
   2638 		return NULL;
   2639 
   2640 	for (m = mons; m; m = m->next) {
   2641 		for (c = m->clients; c; c = c->next) {
   2642 			if (c->isterminal && !c->swallowing && c->pid && isdescprocess(c->pid, w->pid))
   2643 				return c;
   2644 		}
   2645 	}
   2646 
   2647 	return NULL;
   2648 }
   2649 
   2650 Client *
   2651 swallowingclient(Window w)
   2652 {
   2653 	Client *c;
   2654 	Monitor *m;
   2655 
   2656 	for (m = mons; m; m = m->next) {
   2657 		for (c = m->clients; c; c = c->next) {
   2658 			if (c->swallowing && c->swallowing->win == w)
   2659 				return c;
   2660 		}
   2661 	}
   2662 
   2663 	return NULL;
   2664 }
   2665 
   2666 Client *
   2667 wintoclient(Window w)
   2668 {
   2669 	Client *c;
   2670 	Monitor *m;
   2671 
   2672 	for (m = mons; m; m = m->next)
   2673 		for (c = m->clients; c; c = c->next)
   2674 			if (c->win == w)
   2675 				return c;
   2676 	return NULL;
   2677 }
   2678 
   2679 Monitor *
   2680 wintomon(Window w)
   2681 {
   2682 	int x, y;
   2683 	Client *c;
   2684 	Monitor *m;
   2685 
   2686 	if (w == root && getrootptr(&x, &y))
   2687 		return recttomon(x, y, 1, 1);
   2688 	for (m = mons; m; m = m->next)
   2689 		if (w == m->barwin)
   2690 			return m;
   2691 	if ((c = wintoclient(w)))
   2692 		return c->mon;
   2693 	return selmon;
   2694 }
   2695 
   2696 /* There's no way to check accesses to destroyed windows, thus those cases are
   2697  * ignored (especially on UnmapNotify's). Other types of errors call Xlibs
   2698  * default error handler, which may call exit. */
   2699 int
   2700 xerror(Display *dpy, XErrorEvent *ee)
   2701 {
   2702 	if (ee->error_code == BadWindow
   2703 	|| (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
   2704 	|| (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
   2705 	|| (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
   2706 	|| (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
   2707 	|| (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
   2708 	|| (ee->request_code == X_GrabButton && ee->error_code == BadAccess)
   2709 	|| (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
   2710 	|| (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
   2711 		return 0;
   2712 	fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
   2713 		ee->request_code, ee->error_code);
   2714 	return xerrorxlib(dpy, ee); /* may call exit */
   2715 }
   2716 
   2717 int
   2718 xerrordummy(Display *dpy, XErrorEvent *ee)
   2719 {
   2720 	return 0;
   2721 }
   2722 
   2723 /* Startup Error handler to check if another window manager
   2724  * is already running. */
   2725 int
   2726 xerrorstart(Display *dpy, XErrorEvent *ee)
   2727 {
   2728 	die("dwm: another window manager is already running");
   2729 	return -1;
   2730 }
   2731 
   2732 void
   2733 zoom(const Arg *arg)
   2734 {
   2735 	Client *c = selmon->sel;
   2736 
   2737 	if (!selmon->lt[selmon->sellt]->arrange
   2738 	|| (selmon->sel && selmon->sel->isfloating))
   2739 		return;
   2740 	if (c == nexttiled(selmon->clients))
   2741 		if (!c || !(c = nexttiled(c->next)))
   2742 			return;
   2743 	pop(c);
   2744 }
   2745 
   2746 void
   2747 resource_load(XrmDatabase db, char *name, enum resource_type rtype, void *dst)
   2748 {
   2749 	char *sdst = NULL;
   2750 	int *idst = NULL;
   2751 	float *fdst = NULL;
   2752 
   2753 	sdst = dst;
   2754 	idst = dst;
   2755 	fdst = dst;
   2756 
   2757 	char fullname[256];
   2758 	char *type;
   2759 	XrmValue ret;
   2760 
   2761 	snprintf(fullname, sizeof(fullname), "%s.%s", "dwm", name);
   2762 	fullname[sizeof(fullname) - 1] = '\0';
   2763 
   2764 	XrmGetResource(db, fullname, "*", &type, &ret);
   2765 	if (!(ret.addr == NULL || strncmp("String", type, 64)))
   2766 	{
   2767 		switch (rtype) {
   2768 		case STRING:
   2769 			strcpy(sdst, ret.addr);
   2770 			break;
   2771 		case INTEGER:
   2772 			*idst = strtoul(ret.addr, NULL, 10);
   2773 			break;
   2774 		case FLOAT:
   2775 			*fdst = strtof(ret.addr, NULL);
   2776 			break;
   2777 		}
   2778 	}
   2779 }
   2780 
   2781 void
   2782 load_xresources(void)
   2783 {
   2784 	Display *display;
   2785 	char *resm;
   2786 	XrmDatabase db;
   2787 	ResourcePref *p;
   2788 
   2789 	display = XOpenDisplay(NULL);
   2790 	resm = XResourceManagerString(display);
   2791 	if (!resm)
   2792 		return;
   2793 
   2794 	db = XrmGetStringDatabase(resm);
   2795 	for (p = resources; p < resources + LENGTH(resources); p++)
   2796 		resource_load(db, p->name, p->type, p->dst);
   2797 	XCloseDisplay(display);
   2798 }
   2799 
   2800 void
   2801 livereload_xresources(const Arg *arg)
   2802 {
   2803   load_xresources();
   2804   int i;
   2805   for (i = 0; i < LENGTH(colors); i++)
   2806                 scheme[i] = drw_scm_create(drw, colors[i], 3);
   2807   focus(NULL);
   2808   arrange(NULL);
   2809 }
   2810 
   2811 void
   2812 jumptotag(const Arg *arg) {
   2813 	if (selmon->pertag->curtag != 0)
   2814 		return;
   2815 
   2816 	for (int i = 0; i < LENGTH(tags); i++) {
   2817 		if (selmon->sel->tags & 1 << i) {
   2818 			Arg a = {.ui = 1 << i};
   2819 			view(&a);
   2820 			return;
   2821 		}
   2822 	}
   2823 }
   2824 
   2825 
   2826 
   2827 int
   2828 main(int argc, char *argv[])
   2829 {
   2830 	pid_t pid = getpid();
   2831 	char pid_s[sizeof(int)] = {0};
   2832 	snprintf(pid_s, sizeof(int), "%d", pid);
   2833 	setenv("DWM_PID", pid_s, 1);
   2834 
   2835 	if (argc == 2 && !strcmp("-v", argv[1]))
   2836 		die("dwm-"VERSION);
   2837 	else if (argc != 1)
   2838 		die("usage: dwm [-v]");
   2839 	if (!setlocale(LC_CTYPE, "") || !XSupportsLocale())
   2840 		fputs("warning: no locale support\n", stderr);
   2841 	if (!(dpy = XOpenDisplay(NULL)))
   2842 		die("dwm: cannot open display");
   2843 	if (!(xcon = XGetXCBConnection(dpy)))
   2844 		die("dwm: cannot get xcb connection\n");
   2845 	checkotherwm();
   2846 	XrmInitialize();
   2847 	load_xresources();
   2848 	setup();
   2849 #ifdef __OpenBSD__
   2850 	if (pledge("stdio rpath proc exec ps", NULL) == -1)
   2851 		die("pledge");
   2852 #endif /* __OpenBSD__ */
   2853 	scan();
   2854 	run();
   2855 	cleanup();
   2856 	XCloseDisplay(dpy);
   2857 	return EXIT_SUCCESS;
   2858 }