main.c

   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 Display *dpy;
  18 Window root, barwin;
  19 Atom wm_atom[WMLast], net_atom[NetLast];
  20 Cursor cursor[CurLast];
  21 Bool running = True;
  22 Bool issel;
  23
  24 int tsel = Tdev; /* default tag */
  25 int screen, sx, sy, sw, sh, bx, by, bw, bh, mw;
  26 char stext[1024];
  27
  28 DC dc = {0};
  29 Client *clients = NULL;
  30 Client *sel = NULL;
  31
  32 static Bool otherwm;
  33 static const char version[] =
  34         "dwm-" VERSION ", (C)opyright MMVI Anselm R. Garbe\n";
  35 static int (*xerrorxlib)(Display *, XErrorEvent *);
  36
  37 /* static functions */
  38
  39 static void
  40 cleanup()
  41 {
  42         while(sel) {
  43                 resize(sel, True);
  44                 unmanage(sel);
  45         }
  46         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
  47 }
  48
  49 static void
  50 scan()
  51 {
  52         unsigned int i, num;
  53         Window *wins;
  54         XWindowAttributes wa;
  55         Window d1, d2;
  56
  57         if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
  58                 for(i = 0; i < num; i++) {
  59                         if(!XGetWindowAttributes(dpy, wins[i], &wa))
  60                                 continue;
  61                         if(wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
  62                                 continue;
  63                         if(wa.map_state == IsViewable)
  64                                 manage(wins[i], &wa);
  65                 }
  66         }
  67         if(wins)
  68                 XFree(wins);
  69 }
  70
  71 static int
  72 win_property(Window w, Atom a, Atom t, long l, unsigned char **prop)
  73 {
  74         Atom real;
  75         int format;
  76         unsigned long res, extra;
  77         int status;
  78
  79         status = XGetWindowProperty(dpy, w, a, 0L, l, False, t, &real, &format,
  80                         &res, &extra, prop);
  81
  82         if(status != Success || *prop == 0) {
  83                 return 0;
  84         }
  85         if(res == 0) {
  86                 free((void *) *prop);
  87         }
  88         return res;
  89 }
  90
  91 /*
  92  * Startup Error handler to check if another window manager
  93  * is already running.
  94  */
  95 static int
  96 xerrorstart(Display *dsply, XErrorEvent *ee)
  97 {
  98         otherwm = True;
  99         return -1;
 100 }
 101
 102 /* extern functions */
 103
 104 int
 105 getproto(Window w)
 106 {
 107         unsigned char *protocols;
 108         long res;
 109         int protos = 0;
 110         int i;
 111
 112         res = win_property(w, wm_atom[WMProtocols], XA_ATOM, 20L, &protocols);
 113         if(res <= 0) {
 114                 return protos;
 115         }
 116         for(i = 0; i < res; i++) {
 117                 if(protocols[i] == wm_atom[WMDelete])
 118                         protos |= WM_PROTOCOL_DELWIN;
 119         }
 120         free((char *) protocols);
 121         return protos;
 122 }
 123
 124 void
 125 sendevent(Window w, Atom a, long value)
 126 {
 127         XEvent e;
 128
 129         e.type = ClientMessage;
 130         e.xclient.window = w;
 131         e.xclient.message_type = a;
 132         e.xclient.format = 32;
 133         e.xclient.data.l[0] = value;
 134         e.xclient.data.l[1] = CurrentTime;
 135         XSendEvent(dpy, w, False, NoEventMask, &e);
 136         XFlush(dpy);
 137 }
 138
 139 void
 140 quit(Arg *arg)
 141 {
 142         running = False;
 143 }
 144
 145 /*
 146  * There's no way to check accesses to destroyed windows, thus
 147  * those cases are ignored (especially on UnmapNotify's).
 148  * Other types of errors call Xlib's default error handler, which
 149  * calls exit().
 150  */
 151 int
 152 xerror(Display *dpy, XErrorEvent *ee)
 153 {
 154         if(ee->error_code == BadWindow
 155                         || (ee->request_code == X_SetInputFocus
 156                                 && ee->error_code == BadMatch)
 157                         || (ee->request_code == X_PolyText8
 158                                 && ee->error_code == BadDrawable)
 159                         || (ee->request_code == X_PolyFillRectangle
 160                                 && ee->error_code == BadDrawable)
 161                         || (ee->request_code == X_PolySegment
 162                                 && ee->error_code == BadDrawable)
 163                         || (ee->request_code == X_ConfigureWindow
 164                                 && ee->error_code == BadMatch)
 165                         || (ee->request_code == X_GrabKey
 166                                 && ee->error_code == BadAccess))
 167                 return 0;
 168         fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
 169                         ee->request_code, ee->error_code);
 170         return xerrorxlib(dpy, ee); /* may call exit() */
 171 }
 172
 173 int
 174 main(int argc, char *argv[])
 175 {
 176         int i, n;
 177         fd_set rd;
 178         XSetWindowAttributes wa;
 179         unsigned int mask;
 180         Bool readstdin = True;
 181         Window w;
 182         XEvent ev;
 183
 184         for(i = 1; (i < argc) && (argv[i][0] == '-'); i++) {
 185                 switch (argv[i][1]) {
 186                 case 'v':
 187                         fprintf(stdout, "%s", version);
 188                         exit(0);
 189                         break;
 190                 default:
 191                         eprint("usage: dwm [-v]\n");
 192                         break;
 193                 }
 194         }
 195
 196         dpy = XOpenDisplay(0);
 197         if(!dpy)
 198                 eprint("dwm: cannot connect X server\n");
 199
 200         screen = DefaultScreen(dpy);
 201         root = RootWindow(dpy, screen);
 202
 203         /* check if another WM is already running */
 204         otherwm = False;
 205         XSetErrorHandler(xerrorstart);
 206         /* this causes an error if some other WM is running */
 207         XSelectInput(dpy, root, SubstructureRedirectMask);
 208         XFlush(dpy);
 209
 210         if(otherwm)
 211                 eprint("dwm: another window manager is already running\n");
 212
 213         XSetErrorHandler(0);
 214         xerrorxlib = XSetErrorHandler(xerror);
 215
 216         /* init atoms */
 217         wm_atom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
 218         wm_atom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
 219         net_atom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
 220         net_atom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
 221         XChangeProperty(dpy, root, net_atom[NetSupported], XA_ATOM, 32,
 222                         PropModeReplace, (unsigned char *) net_atom, NetLast);
 223
 224         /* init cursors */
 225         cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
 226         cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
 227         cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
 228
 229         grabkeys();
 230
 231         /* style */
 232         dc.bg = getcolor(BGCOLOR);
 233         dc.fg = getcolor(FGCOLOR);
 234         dc.border = getcolor(BORDERCOLOR);
 235         setfont(FONT);
 236
 237         sx = sy = 0;
 238         sw = DisplayWidth(dpy, screen);
 239         sh = DisplayHeight(dpy, screen);
 240         mw = (sw * MASTERW) / 100;
 241
 242         wa.override_redirect = 1;
 243         wa.background_pixmap = ParentRelative;
 244         wa.event_mask = ButtonPressMask | ExposureMask;
 245
 246         bx = by = 0;
 247         bw = sw;
 248         dc.h = bh = dc.font.height + 4;
 249         barwin = XCreateWindow(dpy, root, bx, by, bw, bh, 0, DefaultDepth(dpy, screen),
 250                         CopyFromParent, DefaultVisual(dpy, screen),
 251                         CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
 252         XDefineCursor(dpy, barwin, cursor[CurNormal]);
 253         XMapRaised(dpy, barwin);
 254
 255         dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
 256         dc.gc = XCreateGC(dpy, root, 0, 0);
 257         drawstatus();
 258
 259         issel = XQueryPointer(dpy, root, &w, &w, &i, &i, &i, &i, &mask);
 260
 261         wa.event_mask = SubstructureRedirectMask | EnterWindowMask \
 262                                         | LeaveWindowMask;
 263         wa.cursor = cursor[CurNormal];
 264
 265         XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);
 266
 267         strcpy(stext, "dwm-"VERSION);
 268         scan();
 269
 270         /* main event loop, reads status text from stdin as well */
 271 Mainloop:
 272         while(running) {
 273                 FD_ZERO(&rd);
 274                 if(readstdin)
 275                         FD_SET(STDIN_FILENO, &rd);
 276                 FD_SET(ConnectionNumber(dpy), &rd);
 277
 278                 i = select(ConnectionNumber(dpy) + 1, &rd, 0, 0, 0);
 279                 if(i == -1 && errno == EINTR)
 280                         continue;
 281                 if(i < 0)
 282                         eprint("select failed\n");
 283                 else if(i > 0) {
 284                         if(FD_ISSET(ConnectionNumber(dpy), &rd)) {
 285                                 while(XPending(dpy)) {
 286                                         XNextEvent(dpy, &ev);
 287                                         if(handler[ev.type])
 288                                                 (handler[ev.type])(&ev); /* call handler */
 289                                 }
 290                         }
 291                         if(readstdin && FD_ISSET(STDIN_FILENO, &rd)) {
 292                                 i = n = 0;
 293                                 for(;;) {
 294                                         if((i = getchar()) == EOF) {
 295                                                 /* broken pipe/end of producer */
 296                                                 readstdin = False;
 297                                                 strcpy(stext, "broken pipe");
 298                                                 goto Mainloop;
 299                                         }
 300                                         if(i == '\n' || n >= sizeof(stext) - 1)
 301                                                 break;
 302                                         stext[n++] = i;
 303                                 }
 304                                 stext[n] = 0;
 305                                 drawstatus();
 306                         }
 307                 }
 308         }
 309
 310         cleanup();
 311         XCloseDisplay(dpy);
 312
 313         return 0;
 314 }