1/*
  2 * (C)opyright MMVI Anselm R. Garbe <garbeam at gmail dot com>
  3 * See LICENSE file for license details.
  4 */
  5
  6#include "dwm.h"
  7
  8#include <errno.h>
  9#include <stdio.h>
 10#include <stdlib.h>
 11#include <string.h>
 12#include <unistd.h>
 13#include <X11/cursorfont.h>
 14#include <X11/Xatom.h>
 15#include <X11/Xproto.h>
 16
 17
 18/* static */
 19
 20static Bool otherwm;
 21static int (*xerrorxlib)(Display *, XErrorEvent *);
 22
 23static void
 24cleanup()
 25{
 26	while(sel) {
 27		resize(sel, True);
 28		unmanage(sel);
 29	}
 30	XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 31}
 32
 33static void
 34scan()
 35{
 36	unsigned int i, num;
 37	Window *wins;
 38	XWindowAttributes wa;
 39	Window d1, d2;
 40
 41	if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
 42		for(i = 0; i < num; i++) {
 43			if(!XGetWindowAttributes(dpy, wins[i], &wa))
 44				continue;
 45			if(wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
 46				continue;
 47			if(wa.map_state == IsViewable)
 48				manage(wins[i], &wa);
 49		}
 50	}
 51	if(wins)
 52		XFree(wins);
 53}
 54
 55static int
 56win_property(Window w, Atom a, Atom t, long l, unsigned char **prop)
 57{
 58	Atom real;
 59	int format;
 60	unsigned long res, extra;
 61	int status;
 62
 63	status = XGetWindowProperty(dpy, w, a, 0L, l, False, t, &real, &format,
 64			&res, &extra, prop);
 65
 66	if(status != Success || *prop == 0) {
 67		return 0;
 68	}
 69	if(res == 0) {
 70		free((void *) *prop);
 71	}
 72	return res;
 73}
 74
 75/*
 76 * Startup Error handler to check if another window manager
 77 * is already running.
 78 */
 79static int
 80xerrorstart(Display *dsply, XErrorEvent *ee)
 81{
 82	otherwm = True;
 83	return -1;
 84}
 85
 86/* extern */
 87
 88char stext[1024];
 89int tsel = Tdev; /* default tag */
 90int screen, sx, sy, sw, sh, bx, by, bw, bh, mw;
 91Atom wmatom[WMLast], netatom[NetLast];
 92Bool running = True;
 93Bool issel = True;
 94Client *clients = NULL;
 95Client *sel = NULL;
 96Cursor cursor[CurLast];
 97Display *dpy;
 98DC dc = {0};
 99Window root, barwin;
100
101int
102getproto(Window w)
103{
104	unsigned char *protocols;
105	long res;
106	int protos = 0;
107	int i;
108
109	res = win_property(w, wmatom[WMProtocols], XA_ATOM, 20L, &protocols);
110	if(res <= 0) {
111		return protos;
112	}
113	for(i = 0; i < res; i++) {
114		if(protocols[i] == wmatom[WMDelete])
115			protos |= WM_PROTOCOL_DELWIN;
116	}
117	free((char *) protocols);
118	return protos;
119}
120
121void
122sendevent(Window w, Atom a, long value)
123{
124	XEvent e;
125
126	e.type = ClientMessage;
127	e.xclient.window = w;
128	e.xclient.message_type = a;
129	e.xclient.format = 32;
130	e.xclient.data.l[0] = value;
131	e.xclient.data.l[1] = CurrentTime;
132	XSendEvent(dpy, w, False, NoEventMask, &e);
133	XSync(dpy, False);
134}
135
136void
137quit(Arg *arg)
138{
139	running = False;
140}
141
142/*
143 * There's no way to check accesses to destroyed windows, thus those cases are
144 * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
145 * default error handler, which calls exit().
146 */
147int
148xerror(Display *dpy, XErrorEvent *ee)
149{
150	if(ee->error_code == BadWindow
151			|| (ee->request_code == X_SetInputFocus
152				&& ee->error_code == BadMatch)
153			|| (ee->request_code == X_PolyText8
154				&& ee->error_code == BadDrawable)
155			|| (ee->request_code == X_PolyFillRectangle
156				&& ee->error_code == BadDrawable)
157			|| (ee->request_code == X_PolySegment
158				&& ee->error_code == BadDrawable)
159			|| (ee->request_code == X_ConfigureWindow
160				&& ee->error_code == BadMatch)
161			|| (ee->request_code == X_GrabKey
162				&& ee->error_code == BadAccess))
163		return 0;
164	fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
165			ee->request_code, ee->error_code);
166	return xerrorxlib(dpy, ee); /* may call exit() */
167}
168
169int
170main(int argc, char *argv[])
171{
172	int i, n;
173	fd_set rd;
174	XSetWindowAttributes wa;
175	unsigned int mask;
176	Bool readstdin = True;
177	Window w;
178	XEvent ev;
179
180	for(i = 1; (i < argc) && (argv[i][0] == '-'); i++) {
181		switch (argv[i][1]) {
182		default:
183			eprint("usage: dwm [-v]\n");
184			break;
185		case 'v':
186			fputs("dwm-"VERSION", (C)opyright MMVI Anselm R. Garbe\n", stdout);
187			exit(EXIT_SUCCESS);
188			break;
189		}
190	}
191
192	dpy = XOpenDisplay(0);
193	if(!dpy)
194		eprint("dwm: cannot connect X server\n");
195
196	screen = DefaultScreen(dpy);
197	root = RootWindow(dpy, screen);
198
199	/* check if another WM is already running */
200	otherwm = False;
201	XSetErrorHandler(xerrorstart);
202	/* this causes an error if some other WM is running */
203	XSelectInput(dpy, root, SubstructureRedirectMask);
204	XSync(dpy, False);
205
206	if(otherwm)
207		eprint("dwm: another window manager is already running\n");
208
209	XSetErrorHandler(NULL);
210	xerrorxlib = XSetErrorHandler(xerror);
211
212	/* init atoms */
213	wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
214	wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
215	netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
216	netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
217	XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
218			PropModeReplace, (unsigned char *) netatom, NetLast);
219
220	/* init cursors */
221	cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
222	cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
223	cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
224
225	grabkeys();
226
227	/* style */
228	dc.bg = getcolor(BGCOLOR);
229	dc.fg = getcolor(FGCOLOR);
230	dc.border = getcolor(BORDERCOLOR);
231	setfont(FONT);
232
233	sx = sy = 0;
234	sw = DisplayWidth(dpy, screen);
235	sh = DisplayHeight(dpy, screen);
236	mw = (sw * MASTERW) / 100;
237
238	wa.override_redirect = 1;
239	wa.background_pixmap = ParentRelative;
240	wa.event_mask = ButtonPressMask | ExposureMask;
241
242	bx = by = 0;
243	bw = sw;
244	dc.h = bh = dc.font.height + 4;
245	barwin = XCreateWindow(dpy, root, bx, by, bw, bh, 0, DefaultDepth(dpy, screen),
246			CopyFromParent, DefaultVisual(dpy, screen),
247			CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
248	XDefineCursor(dpy, barwin, cursor[CurNormal]);
249	XMapRaised(dpy, barwin);
250
251	dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
252	dc.gc = XCreateGC(dpy, root, 0, 0);
253	drawstatus();
254
255	issel = XQueryPointer(dpy, root, &w, &w, &i, &i, &i, &i, &mask);
256
257	wa.event_mask = SubstructureRedirectMask | EnterWindowMask \
258					| LeaveWindowMask;
259	wa.cursor = cursor[CurNormal];
260
261	XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);
262
263	strcpy(stext, "dwm-"VERSION);
264	scan();
265
266	/* main event loop, reads status text from stdin as well */
267Mainloop:
268	while(running) {
269		FD_ZERO(&rd);
270		if(readstdin)
271			FD_SET(STDIN_FILENO, &rd);
272		FD_SET(ConnectionNumber(dpy), &rd);
273
274		i = select(ConnectionNumber(dpy) + 1, &rd, 0, 0, 0);
275		if(i == -1 && errno == EINTR)
276			continue;
277		if(i < 0)
278			eprint("select failed\n");
279		else if(i > 0) {
280			if(FD_ISSET(ConnectionNumber(dpy), &rd)) {
281				while(XPending(dpy)) {
282					XNextEvent(dpy, &ev);
283					if(handler[ev.type])
284						(handler[ev.type])(&ev); /* call handler */
285				}
286			}
287			if(readstdin && FD_ISSET(STDIN_FILENO, &rd)) {
288				i = n = 0;
289				for(;;) {
290					if((i = getchar()) == EOF) {
291						/* broken pipe/end of producer */
292						readstdin = False;
293						strcpy(stext, "broken pipe");
294						goto Mainloop;
295					}
296					if(i == '\n' || n >= sizeof(stext) - 1)
297						break;
298					stext[n++] = i;
299				}
300				stext[n] = 0;
301				drawstatus();
302			}
303		}
304	}
305
306	cleanup();
307	XCloseDisplay(dpy);
308
309	return 0;
310}