wm.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 <stdarg.h>
   7 #include <stdio.h>
   8 #include <stdlib.h>
   9
  10 #include <X11/cursorfont.h>
  11 #include <X11/Xatom.h>
  12 #include <X11/Xproto.h>
  13
  14 #include "wm.h"
  15
  16 Display *dpy;
  17 Window root;
  18 XRectangle rect;
  19 int screen, sel_screen;
  20 Atom wm_atom[WMLast];
  21 Atom net_atom[NetLast];
  22 Cursor cursor[CurLast];
  23 unsigned int kmask, numlock_mask;
  24 Pixmap pmap;
  25
  26 enum { WM_PROTOCOL_DELWIN = 1 };
  27
  28 static Bool other_wm_running;
  29 static int (*x_error_handler) (Display *, XErrorEvent *);
  30 static char version[] = "gridwm - " VERSION ", (C)opyright MMVI Anselm R. Garbe\n";
  31
  32 static void
  33 usage()
  34 {
  35         fputs("usage: gridwm [-v]\n", stderr);
  36         exit(1);
  37 }
  38
  39 void
  40 error(char *errstr, ...) {
  41         va_list ap;
  42         va_start(ap, errstr);
  43         vfprintf(stderr, errstr, ap);
  44         va_end(ap);
  45         exit(1);
  46 }
  47
  48 static void
  49 scan_wins()
  50 {
  51         unsigned int i, num;
  52         Window *wins;
  53         XWindowAttributes wa;
  54         Window d1, d2;
  55
  56         if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
  57                 for(i = 0; i < num; i++) {
  58                         if(!XGetWindowAttributes(dpy, wins[i], &wa))
  59                                 continue;
  60                         if(wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
  61                                 continue;
  62                         if(wa.map_state == IsViewable)
  63                                 /*manage*/;
  64                 }
  65         }
  66         if(wins)
  67                 XFree(wins);
  68 }
  69
  70 static int
  71 win_property(Window w, Atom a, Atom t, long l, unsigned char **prop)
  72 {
  73         Atom real;
  74         int format;
  75         unsigned long res, extra;
  76         int status;
  77
  78         status = XGetWindowProperty(dpy, w, a, 0L, l, False, t, &real, &format,
  79                         &res, &extra, prop);
  80
  81         if(status != Success || *prop == 0) {
  82                 return 0;
  83         }
  84         if(res == 0) {
  85                 free((void *) *prop);
  86         }
  87         return res;
  88 }
  89
  90 int
  91 win_proto(Window w)
  92 {
  93         Atom *protocols;
  94         long res;
  95         int protos = 0;
  96         int i;
  97
  98         res = win_property(w, wm_atom[WMProtocols], XA_ATOM, 20L,
  99                         ((unsigned char **) &protocols));
 100         if(res <= 0) {
 101                 return protos;
 102         }
 103         for(i = 0; i < res; i++) {
 104                 if(protocols[i] == wm_atom[WMDelete])
 105                         protos |= WM_PROTOCOL_DELWIN;
 106         }
 107         free((char *) protocols);
 108         return protos;
 109 }
 110
 111 /*
 112  * There's no way to check accesses to destroyed windows, thus
 113  * those cases are ignored (especially on UnmapNotify's).
 114  * Other types of errors call Xlib's default error handler, which
 115  * calls exit().
 116  */
 117 static int
 118 error_handler(Display *dpy, XErrorEvent *error)
 119 {
 120         if(error->error_code == BadWindow
 121                         || (error->request_code == X_SetInputFocus
 122                                 && error->error_code == BadMatch)
 123                         || (error->request_code == X_PolyText8
 124                                 && error->error_code == BadDrawable)
 125                         || (error->request_code == X_PolyFillRectangle
 126                                 && error->error_code == BadDrawable)
 127                         || (error->request_code == X_PolySegment
 128                                 && error->error_code == BadDrawable)
 129                         || (error->request_code == X_ConfigureWindow
 130                                 && error->error_code == BadMatch)
 131                         || (error->request_code == X_GrabKey
 132                                 && error->error_code == BadAccess))
 133                 return 0;
 134         fprintf(stderr, "gridwm: fatal error: request code=%d, error code=%d\n",
 135                         error->request_code, error->error_code);
 136         return x_error_handler(dpy, error); /* may call exit() */
 137 }
 138
 139 /*
 140  * Startup Error handler to check if another window manager
 141  * is already running.
 142  */
 143 static int
 144 startup_error_handler(Display *dpy, XErrorEvent *error)
 145 {
 146         other_wm_running = True;
 147         return -1;
 148 }
 149
 150 static void
 151 init_lock_keys()
 152 {
 153         XModifierKeymap *modmap;
 154         KeyCode numlock;
 155         int i;
 156         static int masks[] = {
 157                 ShiftMask, LockMask, ControlMask, Mod1Mask,
 158                 Mod2Mask, Mod3Mask, Mod4Mask, Mod5Mask
 159         };
 160
 161         numlock_mask = 0;
 162         modmap = XGetModifierMapping(dpy);
 163         numlock = XKeysymToKeycode(dpy, XStringToKeysym("Num_Lock"));
 164
 165         if(modmap && modmap->max_keypermod > 0) {
 166                 int max = (sizeof(masks) / sizeof(int)) * modmap->max_keypermod;
 167                 for(i = 0; i < max; i++)
 168                         if(numlock && (modmap->modifiermap[i] == numlock))
 169                                 numlock_mask = masks[i / modmap->max_keypermod];
 170         }
 171         XFreeModifiermap(modmap);
 172
 173         kmask = 255 & ~(numlock_mask | LockMask);
 174 }
 175
 176 static void
 177 cleanup()
 178 {
 179         /*
 180         Client *c;
 181         for(c=client; c; c=c->next)
 182                 reparent_client(c, root, c->sel->rect.x, c->sel->rect.y);
 183         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 184         */
 185 }
 186
 187 int
 188 main(int argc, char *argv[])
 189 {
 190         int i;
 191         XSetWindowAttributes wa;
 192         unsigned int mask;
 193         Window w;
 194
 195         /* command line args */
 196         for(i = 1; (i < argc) && (argv[i][0] == '-'); i++) {
 197                 switch (argv[i][1]) {
 198                 case 'v':
 199                         fprintf(stdout, "%s", version);
 200                         exit(0);
 201                         break;
 202                 default:
 203                         usage();
 204                         break;
 205                 }
 206         }
 207
 208         dpy = XOpenDisplay(0);
 209         if(!dpy)
 210                 error("gridwm: cannot connect X server\n");
 211
 212         screen = DefaultScreen(dpy);
 213         root = RootWindow(dpy, screen);
 214
 215         /* check if another WM is already running */
 216         other_wm_running = False;
 217         XSetErrorHandler(startup_error_handler);
 218         /* this causes an error if some other WM is running */
 219         XSelectInput(dpy, root, SubstructureRedirectMask);
 220         XSync(dpy, False);
 221
 222         if(other_wm_running)
 223                 error("gridwm: another window manager is already running\n");
 224
 225         rect.x = rect.y = 0;
 226         rect.width = DisplayWidth(dpy, screen);
 227         rect.height = DisplayHeight(dpy, screen);
 228         sel_screen = XQueryPointer(dpy, root, &w, &w, &i, &i, &i, &i, &mask);
 229
 230         XSetErrorHandler(0);
 231         x_error_handler = XSetErrorHandler(error_handler);
 232
 233         /* init atoms */
 234         wm_atom[WMState] = XInternAtom(dpy, "WM_STATE", False);
 235         wm_atom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
 236         wm_atom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
 237         net_atom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
 238         net_atom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
 239
 240         XChangeProperty(dpy, root, net_atom[NetSupported], XA_ATOM, 32,
 241                         PropModeReplace, (unsigned char *) net_atom, NetLast);
 242
 243
 244         /* init cursors */
 245         cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
 246         cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
 247         cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
 248
 249         init_lock_keys();
 250
 251         pmap = XCreatePixmap(dpy, root, rect.width, rect.height,
 252                         DefaultDepth(dpy, screen));
 253
 254         wa.event_mask = SubstructureRedirectMask | EnterWindowMask | LeaveWindowMask;
 255         wa.cursor = cursor[CurNormal];
 256         XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);
 257
 258         scan_wins();
 259
 260         cleanup();
 261         XCloseDisplay(dpy);
 262
 263         return 0;
 264 }