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		case 'v':
183			fprintf(stdout, "%s",
184					"dwm-"VERSION", (C)opyright MMVI Anselm R. Garbe\n");
185			exit(0);
186			break;
187		default:
188			eprint("usage: dwm [-v]\n");
189			break;
190		}
191	}
192
193	dpy = XOpenDisplay(0);
194	if(!dpy)
195		eprint("dwm: cannot connect X server\n");
196
197	screen = DefaultScreen(dpy);
198	root = RootWindow(dpy, screen);
199
200	/* check if another WM is already running */
201	otherwm = False;
202	XSetErrorHandler(xerrorstart);
203	/* this causes an error if some other WM is running */
204	XSelectInput(dpy, root, SubstructureRedirectMask);
205	XSync(dpy, False);
206
207	if(otherwm)
208		eprint("dwm: another window manager is already running\n");
209
210	XSetErrorHandler(NULL);
211	xerrorxlib = XSetErrorHandler(xerror);
212
213	/* init atoms */
214	wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
215	wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
216	netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
217	netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
218	XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
219			PropModeReplace, (unsigned char *) netatom, NetLast);
220
221	/* init cursors */
222	cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
223	cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
224	cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
225
226	grabkeys();
227
228	/* style */
229	dc.bg = getcolor(BGCOLOR);
230	dc.fg = getcolor(FGCOLOR);
231	dc.border = getcolor(BORDERCOLOR);
232	setfont(FONT);
233
234	sx = sy = 0;
235	sw = DisplayWidth(dpy, screen);
236	sh = DisplayHeight(dpy, screen);
237	mw = (sw * MASTERW) / 100;
238
239	wa.override_redirect = 1;
240	wa.background_pixmap = ParentRelative;
241	wa.event_mask = ButtonPressMask | ExposureMask;
242
243	bx = by = 0;
244	bw = sw;
245	dc.h = bh = dc.font.height + 4;
246	barwin = XCreateWindow(dpy, root, bx, by, bw, bh, 0, DefaultDepth(dpy, screen),
247			CopyFromParent, DefaultVisual(dpy, screen),
248			CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
249	XDefineCursor(dpy, barwin, cursor[CurNormal]);
250	XMapRaised(dpy, barwin);
251
252	dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
253	dc.gc = XCreateGC(dpy, root, 0, 0);
254	drawstatus();
255
256	issel = XQueryPointer(dpy, root, &w, &w, &i, &i, &i, &i, &mask);
257
258	wa.event_mask = SubstructureRedirectMask | EnterWindowMask \
259					| LeaveWindowMask;
260	wa.cursor = cursor[CurNormal];
261
262	XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);
263
264	strcpy(stext, "dwm-"VERSION);
265	scan();
266
267	/* main event loop, reads status text from stdin as well */
268Mainloop:
269	while(running) {
270		FD_ZERO(&rd);
271		if(readstdin)
272			FD_SET(STDIN_FILENO, &rd);
273		FD_SET(ConnectionNumber(dpy), &rd);
274
275		i = select(ConnectionNumber(dpy) + 1, &rd, 0, 0, 0);
276		if(i == -1 && errno == EINTR)
277			continue;
278		if(i < 0)
279			eprint("select failed\n");
280		else if(i > 0) {
281			if(FD_ISSET(ConnectionNumber(dpy), &rd)) {
282				while(XPending(dpy)) {
283					XNextEvent(dpy, &ev);
284					if(handler[ev.type])
285						(handler[ev.type])(&ev); /* call handler */
286				}
287			}
288			if(readstdin && FD_ISSET(STDIN_FILENO, &rd)) {
289				i = n = 0;
290				for(;;) {
291					if((i = getchar()) == EOF) {
292						/* broken pipe/end of producer */
293						readstdin = False;
294						strcpy(stext, "broken pipe");
295						goto Mainloop;
296					}
297					if(i == '\n' || n >= sizeof(stext) - 1)
298						break;
299					stext[n++] = i;
300				}
301				stext[n] = 0;
302				drawstatus();
303			}
304		}
305	}
306
307	cleanup();
308	XCloseDisplay(dpy);
309
310	return 0;
311}