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