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];
 86Bool *seltag;
 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	Atom *protocols;
106
107	res = win_property(w, wmatom[WMProtocols], XA_ATOM, 20L,
108			((unsigned char **)&protocols));
109	if(res <= 0) {
110		return protos;
111	}
112	for(i = 0; i < res; i++) {
113		if(protocols[i] == wmatom[WMDelete])
114			protos |= PROTODELWIN;
115	}
116	free((char *) protocols);
117	return protos;
118}
119
120void
121sendevent(Window w, Atom a, long value)
122{
123	XEvent e;
124
125	e.type = ClientMessage;
126	e.xclient.window = w;
127	e.xclient.message_type = a;
128	e.xclient.format = 32;
129	e.xclient.data.l[0] = value;
130	e.xclient.data.l[1] = CurrentTime;
131	XSendEvent(dpy, w, False, NoEventMask, &e);
132	XSync(dpy, False);
133}
134
135void
136quit(Arg *arg)
137{
138	running = False;
139}
140
141/*
142 * There's no way to check accesses to destroyed windows, thus those cases are
143 * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
144 * default error handler, which calls exit().
145 */
146int
147xerror(Display *dpy, XErrorEvent *ee)
148{
149	if(ee->error_code == BadWindow
150	|| (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
151	|| (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
152	|| (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
153	|| (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
154	|| (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
155	|| (ee->request_code == X_GrabKey && ee->error_code == BadAccess))
156		return 0;
157	fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
158		ee->request_code, ee->error_code);
159	return xerrorxlib(dpy, ee); /* may call exit() */
160}
161
162int
163main(int argc, char *argv[])
164{
165	int i, xfd;
166	unsigned int mask;
167	fd_set rd;
168	Bool readin = True;
169	Window w;
170	XEvent ev;
171	XSetWindowAttributes wa;
172
173	if(argc == 2 && !strncmp("-v", argv[1], 3)) {
174		fputs("dwm-"VERSION", (C)opyright MMVI Anselm R. Garbe\n", stdout);
175		exit(EXIT_SUCCESS);
176	}
177	else if(argc != 1)
178		eprint("usage: dwm [-v]\n");
179
180	dpy = XOpenDisplay(0);
181	if(!dpy)
182		eprint("dwm: cannot open display\n");
183
184	xfd = ConnectionNumber(dpy);
185	screen = DefaultScreen(dpy);
186	root = RootWindow(dpy, screen);
187
188	otherwm = False;
189	XSetErrorHandler(xerrorstart);
190	/* this causes an error if some other window manager is running */
191	XSelectInput(dpy, root, SubstructureRedirectMask);
192	XSync(dpy, False);
193
194	if(otherwm)
195		eprint("dwm: another window manager is already running\n");
196
197	XSetErrorHandler(NULL);
198	xerrorxlib = XSetErrorHandler(xerror);
199	XSync(dpy, False);
200
201	/* init atoms */
202	wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
203	wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
204	netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
205	netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
206	XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
207			PropModeReplace, (unsigned char *) netatom, NetLast);
208
209	/* init cursors */
210	cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
211	cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
212	cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
213
214	grabkeys();
215	initrregs();
216
217	for(ntags = 0; tags[ntags]; ntags++);
218	seltag = emallocz(sizeof(Bool) * ntags);
219	seltag[DEFTAG] = True;
220
221	/* style */
222	dc.bg = getcolor(BGCOLOR);
223	dc.fg = getcolor(FGCOLOR);
224	dc.border = getcolor(BORDERCOLOR);
225	setfont(FONT);
226
227	sx = sy = 0;
228	sw = DisplayWidth(dpy, screen);
229	sh = DisplayHeight(dpy, screen);
230	mw = (sw * MASTERW) / 100;
231
232	wa.override_redirect = 1;
233	wa.background_pixmap = ParentRelative;
234	wa.event_mask = ButtonPressMask | ExposureMask;
235
236	bx = by = 0;
237	bw = sw;
238	dc.h = bh = dc.font.height + 4;
239	barwin = XCreateWindow(dpy, root, bx, by, bw, bh, 0, DefaultDepth(dpy, screen),
240			CopyFromParent, DefaultVisual(dpy, screen),
241			CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
242	XDefineCursor(dpy, barwin, cursor[CurNormal]);
243	XMapRaised(dpy, barwin);
244
245	dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
246	dc.gc = XCreateGC(dpy, root, 0, 0);
247
248	strcpy(stext, "dwm-"VERSION);
249	drawstatus();
250
251	issel = XQueryPointer(dpy, root, &w, &w, &i, &i, &i, &i, &mask);
252
253	wa.event_mask = SubstructureRedirectMask | EnterWindowMask | LeaveWindowMask;
254	wa.cursor = cursor[CurNormal];
255	XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);
256
257	scan();
258
259	/* main event loop, also reads status text from stdin */
260	XSync(dpy, False);
261	while(running) {
262		FD_ZERO(&rd);
263		if(readin)
264			FD_SET(STDIN_FILENO, &rd);
265		FD_SET(xfd, &rd);
266		i = select(xfd + 1, &rd, NULL, NULL, NULL);
267		if(i == -1 && errno == EINTR)
268			continue;
269		if(i < 0)
270			eprint("select failed\n");
271		else if(i > 0) {
272			if(readin && FD_ISSET(STDIN_FILENO, &rd)) {
273				readin = NULL != fgets(stext, sizeof(stext), stdin);
274				if(readin)
275					stext[strlen(stext) - 1] = 0;
276				else 
277					strcpy(stext, "broken pipe");
278				drawstatus();
279			}
280			if(FD_ISSET(xfd, &rd)) {
281				while(XPending(dpy)) {
282					XNextEvent(dpy, &ev);
283					if(handler[ev.type])
284						(handler[ev.type])(&ev); /* call handler */
285				}
286			}
287		}
288	}
289	cleanup();
290	XCloseDisplay(dpy);
291
292	return 0;
293}