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#include <errno.h>
  8#include <stdio.h>
  9#include <stdlib.h>
 10#include <string.h>
 11#include <unistd.h>
 12#include <sys/select.h>
 13#include <X11/cursorfont.h>
 14#include <X11/Xatom.h>
 15#include <X11/Xproto.h>
 16
 17/* static */
 18
 19static int (*xerrorxlib)(Display *, XErrorEvent *);
 20static Bool otherwm;
 21
 22static void
 23cleanup()
 24{
 25	while(sel) {
 26		resize(sel, True, TopLeft);
 27		unmanage(sel);
 28	}
 29	XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 30}
 31
 32static void
 33scan()
 34{
 35	unsigned int i, num;
 36	Window *wins, d1, d2;
 37	XWindowAttributes wa;
 38
 39	if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
 40		for(i = 0; i < num; i++) {
 41			if(!XGetWindowAttributes(dpy, wins[i], &wa))
 42				continue;
 43			if(wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
 44				continue;
 45			if(wa.map_state == IsViewable)
 46				manage(wins[i], &wa);
 47		}
 48	}
 49	if(wins)
 50		XFree(wins);
 51}
 52
 53static int
 54win_property(Window w, Atom a, Atom t, long l, unsigned char **prop)
 55{
 56	int status, format;
 57	unsigned long res, extra;
 58	Atom real;
 59
 60	status = XGetWindowProperty(dpy, w, a, 0L, l, False, t, &real, &format,
 61			&res, &extra, prop);
 62
 63	if(status != Success || *prop == 0) {
 64		return 0;
 65	}
 66	if(res == 0) {
 67		free((void *) *prop);
 68	}
 69	return res;
 70}
 71
 72/*
 73 * Startup Error handler to check if another window manager
 74 * is already running.
 75 */
 76static int
 77xerrorstart(Display *dsply, XErrorEvent *ee)
 78{
 79	otherwm = True;
 80	return -1;
 81}
 82
 83/* extern */
 84
 85char stext[1024];
 86int tsel = DEFTAG;
 87int screen, sx, sy, sw, sh, bx, by, bw, bh, mw;
 88unsigned int ntags;
 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 |= PROTODELWIN;
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;
165	unsigned int mask;
166	fd_set rd;
167	Bool readin = True;
168	Window w;
169	XEvent ev;
170	XSetWindowAttributes wa;
171
172	if(argc == 2 && !strncmp("-v", argv[1], 3)) {
173		fputs("dwm-"VERSION", (C)opyright MMVI Anselm R. Garbe\n", stdout);
174		exit(EXIT_SUCCESS);
175	}
176	else if(argc != 1)
177		eprint("usage: dwm [-v]\n");
178
179	dpy = XOpenDisplay(0);
180	if(!dpy)
181		eprint("dwm: cannot open display\n");
182
183	screen = DefaultScreen(dpy);
184	root = RootWindow(dpy, screen);
185
186	otherwm = False;
187	XSetErrorHandler(xerrorstart);
188	/* this causes an error if some other window manager is running */
189	XSelectInput(dpy, root, SubstructureRedirectMask);
190	XSync(dpy, False);
191
192	if(otherwm)
193		eprint("dwm: another window manager is already running\n");
194
195	XSetErrorHandler(NULL);
196	xerrorxlib = XSetErrorHandler(xerror);
197
198	/* init atoms */
199	wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
200	wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
201	netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
202	netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
203	XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
204			PropModeReplace, (unsigned char *) netatom, NetLast);
205
206	/* init cursors */
207	cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
208	cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
209	cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
210
211	grabkeys();
212	initrregs();
213
214	for(ntags = 0; tags[ntags]; ntags++);
215
216	/* style */
217	dc.bg = getcolor(BGCOLOR);
218	dc.fg = getcolor(FGCOLOR);
219	dc.border = getcolor(BORDERCOLOR);
220	setfont(FONT);
221
222	sx = sy = 0;
223	sw = DisplayWidth(dpy, screen);
224	sh = DisplayHeight(dpy, screen);
225	mw = (sw * MASTERW) / 100;
226
227	wa.override_redirect = 1;
228	wa.background_pixmap = ParentRelative;
229	wa.event_mask = ButtonPressMask | ExposureMask;
230
231	bx = by = 0;
232	bw = sw;
233	dc.h = bh = dc.font.height + 4;
234	barwin = XCreateWindow(dpy, root, bx, by, bw, bh, 0, DefaultDepth(dpy, screen),
235			CopyFromParent, DefaultVisual(dpy, screen),
236			CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
237	XDefineCursor(dpy, barwin, cursor[CurNormal]);
238	XMapRaised(dpy, barwin);
239
240	dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
241	dc.gc = XCreateGC(dpy, root, 0, 0);
242	drawstatus();
243
244	issel = XQueryPointer(dpy, root, &w, &w, &i, &i, &i, &i, &mask);
245
246	wa.event_mask = SubstructureRedirectMask | EnterWindowMask | LeaveWindowMask;
247	wa.cursor = cursor[CurNormal];
248	XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);
249
250	strcpy(stext, "dwm-"VERSION);
251	scan();
252
253	/* main event loop, reads status text from stdin as well */
254	while(running) {
255		FD_ZERO(&rd);
256		if(readin)
257			FD_SET(STDIN_FILENO, &rd);
258		FD_SET(ConnectionNumber(dpy), &rd);
259
260		i = select(ConnectionNumber(dpy) + 1, &rd, 0, 0, 0);
261		if(i == -1 && errno == EINTR)
262			continue;
263		if(i < 0)
264			eprint("select failed\n");
265		else if(i > 0) {
266			if(FD_ISSET(ConnectionNumber(dpy), &rd)) {
267				while(XPending(dpy)) {
268					XNextEvent(dpy, &ev);
269					if(handler[ev.type])
270						(handler[ev.type])(&ev); /* call handler */
271				}
272			}
273			if(readin && FD_ISSET(STDIN_FILENO, &rd)) {
274				readin = NULL != fgets(stext, sizeof(stext), stdin);
275				if(readin)
276					stext[strlen(stext) - 1] = 0;
277				else 
278					strcpy(stext, "broken pipe");
279				drawstatus();
280			}
281		}
282	}
283
284	cleanup();
285	XCloseDisplay(dpy);
286
287	return 0;
288}