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