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;
 88Atom wmatom[WMLast], netatom[NetLast];
 89Bool running = True;
 90Bool issel = True;
 91Client *clients = NULL;
 92Client *sel = NULL;
 93Cursor cursor[CurLast];
 94Display *dpy;
 95DC dc = {0};
 96Window root, barwin;
 97
 98int
 99getproto(Window w)
100{
101	int protos = 0;
102	int i;
103	long res;
104	unsigned char *protocols;
105
106	res = win_property(w, wmatom[WMProtocols], XA_ATOM, 20L, &protocols);
107	if(res <= 0) {
108		return protos;
109	}
110	for(i = 0; i < res; i++) {
111		if(protocols[i] == wmatom[WMDelete])
112			protos |= PROTODELWIN;
113	}
114	free((char *) protocols);
115	return protos;
116}
117
118void
119sendevent(Window w, Atom a, long value)
120{
121	XEvent e;
122
123	e.type = ClientMessage;
124	e.xclient.window = w;
125	e.xclient.message_type = a;
126	e.xclient.format = 32;
127	e.xclient.data.l[0] = value;
128	e.xclient.data.l[1] = CurrentTime;
129	XSendEvent(dpy, w, False, NoEventMask, &e);
130	XSync(dpy, False);
131}
132
133void
134quit(Arg *arg)
135{
136	running = False;
137}
138
139/*
140 * There's no way to check accesses to destroyed windows, thus those cases are
141 * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
142 * default error handler, which calls exit().
143 */
144int
145xerror(Display *dpy, XErrorEvent *ee)
146{
147	if(ee->error_code == BadWindow
148	|| (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
149	|| (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
150	|| (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
151	|| (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
152	|| (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
153	|| (ee->request_code == X_GrabKey && ee->error_code == BadAccess))
154		return 0;
155	fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
156		ee->request_code, ee->error_code);
157	return xerrorxlib(dpy, ee); /* may call exit() */
158}
159
160int
161main(int argc, char *argv[])
162{
163	int i;
164	unsigned int mask;
165	fd_set rd;
166	Bool readin = True;
167	Window w;
168	XEvent ev;
169	XSetWindowAttributes wa;
170
171	if(argc == 2 && !strncmp("-v", argv[1], 3)) {
172		fputs("dwm-"VERSION", (C)opyright MMVI Anselm R. Garbe\n", stdout);
173		exit(EXIT_SUCCESS);
174	}
175	else if(argc != 1)
176		eprint("usage: dwm [-v]\n");
177
178	dpy = XOpenDisplay(0);
179	if(!dpy)
180		eprint("dwm: cannot connect X server\n");
181
182	screen = DefaultScreen(dpy);
183	root = RootWindow(dpy, screen);
184
185	/* check if another WM is already running */
186	otherwm = False;
187	XSetErrorHandler(xerrorstart);
188	/* this causes an error if some other WM 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
213	/* style */
214	dc.bg = getcolor(BGCOLOR);
215	dc.fg = getcolor(FGCOLOR);
216	dc.border = getcolor(BORDERCOLOR);
217	setfont(FONT);
218
219	sx = sy = 0;
220	sw = DisplayWidth(dpy, screen);
221	sh = DisplayHeight(dpy, screen);
222	mw = (sw * MASTERW) / 100;
223
224	wa.override_redirect = 1;
225	wa.background_pixmap = ParentRelative;
226	wa.event_mask = ButtonPressMask | ExposureMask;
227
228	bx = by = 0;
229	bw = sw;
230	dc.h = bh = dc.font.height + 4;
231	barwin = XCreateWindow(dpy, root, bx, by, bw, bh, 0, DefaultDepth(dpy, screen),
232			CopyFromParent, DefaultVisual(dpy, screen),
233			CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
234	XDefineCursor(dpy, barwin, cursor[CurNormal]);
235	XMapRaised(dpy, barwin);
236
237	dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
238	dc.gc = XCreateGC(dpy, root, 0, 0);
239	drawstatus();
240
241	issel = XQueryPointer(dpy, root, &w, &w, &i, &i, &i, &i, &mask);
242
243	wa.event_mask = SubstructureRedirectMask | EnterWindowMask | LeaveWindowMask;
244	wa.cursor = cursor[CurNormal];
245	XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);
246
247	strcpy(stext, "dwm-"VERSION);
248	scan();
249
250	/* main event loop, reads status text from stdin as well */
251	while(running) {
252		FD_ZERO(&rd);
253		if(readin)
254			FD_SET(STDIN_FILENO, &rd);
255		FD_SET(ConnectionNumber(dpy), &rd);
256
257		i = select(ConnectionNumber(dpy) + 1, &rd, 0, 0, 0);
258		if(i == -1 && errno == EINTR)
259			continue;
260		if(i < 0)
261			eprint("select failed\n");
262		else if(i > 0) {
263			if(FD_ISSET(ConnectionNumber(dpy), &rd)) {
264				while(XPending(dpy)) {
265					XNextEvent(dpy, &ev);
266					if(handler[ev.type])
267						(handler[ev.type])(&ev); /* call handler */
268				}
269			}
270			if(readin && FD_ISSET(STDIN_FILENO, &rd)) {
271				readin = NULL != fgets(stext, sizeof(stext), stdin);
272				if(readin)
273					stext[strlen(stext) - 1] = 0;
274				else 
275					strcpy(stext, "broken pipe");
276				drawstatus();
277			}
278		}
279	}
280
281	cleanup();
282	XCloseDisplay(dpy);
283
284	return 0;
285}