main.c

   1 /* See LICENSE file for copyright and license details. */
   2 #include "dwm.h"
   3 #include <errno.h>
   4 #include <locale.h>
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7 #include <string.h>
   8 #include <unistd.h>
   9 #include <sys/select.h>
  10 #include <X11/cursorfont.h>
  11 #include <X11/keysym.h>
  12 #include <X11/Xatom.h>
  13 #include <X11/Xproto.h>
  14
  15 /* extern */
  16
  17 char stext[256];
  18 int screen, sx, sy, sw, sh, wax, way, waw, wah;
  19 unsigned int bh, bpos, ntags, numlockmask;
  20 Atom wmatom[WMLast], netatom[NetLast];
  21 Bool *seltag;
  22 Bool selscreen = True;
  23 Client *clients = NULL;
  24 Client *sel = NULL;
  25 Client *stack = NULL;
  26 Cursor cursor[CurLast];
  27 Display *dpy;
  28 DC dc = {0};
  29 Window root, barwin;
  30
  31 /* static */
  32
  33 static int (*xerrorxlib)(Display *, XErrorEvent *);
  34 static Bool otherwm, readin;
  35 static Bool running = True;
  36
  37 static void
  38 cleanup(void) {
  39         close(STDIN_FILENO);
  40         while(stack) {
  41                 if(stack->isbanned)
  42                         XMoveWindow(dpy, stack->win, stack->x, stack->y);
  43                 unmanage(stack);
  44         }
  45         if(dc.font.set)
  46                 XFreeFontSet(dpy, dc.font.set);
  47         else
  48                 XFreeFont(dpy, dc.font.xfont);
  49         XUngrabKey(dpy, AnyKey, AnyModifier, root);
  50         XFreePixmap(dpy, dc.drawable);
  51         XFreeGC(dpy, dc.gc);
  52         XDestroyWindow(dpy, barwin);
  53         XFreeCursor(dpy, cursor[CurNormal]);
  54         XFreeCursor(dpy, cursor[CurResize]);
  55         XFreeCursor(dpy, cursor[CurMove]);
  56         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
  57         XSync(dpy, False);
  58         free(seltag);
  59 }
  60
  61 static unsigned long
  62 initcolor(const char *colstr) {
  63         Colormap cmap = DefaultColormap(dpy, screen);
  64         XColor color;
  65
  66         if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
  67                 eprint("error, cannot allocate color '%s'\n", colstr);
  68         return color.pixel;
  69 }
  70
  71 static void
  72 initfont(const char *fontstr) {
  73         char *def, **missing;
  74         int i, n;
  75
  76         missing = NULL;
  77         if(dc.font.set)
  78                 XFreeFontSet(dpy, dc.font.set);
  79         dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
  80         if(missing) {
  81                 while(n--)
  82                         fprintf(stderr, "dwm: missing fontset: %s\n", missing[n]);
  83                 XFreeStringList(missing);
  84         }
  85         if(dc.font.set) {
  86                 XFontSetExtents *font_extents;
  87                 XFontStruct **xfonts;
  88                 char **font_names;
  89                 dc.font.ascent = dc.font.descent = 0;
  90                 font_extents = XExtentsOfFontSet(dc.font.set);
  91                 n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
  92                 for(i = 0, dc.font.ascent = 0, dc.font.descent = 0; i < n; i++) {
  93                         if(dc.font.ascent < (*xfonts)->ascent)
  94                                 dc.font.ascent = (*xfonts)->ascent;
  95                         if(dc.font.descent < (*xfonts)->descent)
  96                                 dc.font.descent = (*xfonts)->descent;
  97                         xfonts++;
  98                 }
  99         }
 100         else {
 101                 if(dc.font.xfont)
 102                         XFreeFont(dpy, dc.font.xfont);
 103                 dc.font.xfont = NULL;
 104                 if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr)))
 105                         eprint("error, cannot load font: '%s'\n", fontstr);
 106                 dc.font.ascent = dc.font.xfont->ascent;
 107                 dc.font.descent = dc.font.xfont->descent;
 108         }
 109         dc.font.height = dc.font.ascent + dc.font.descent;
 110 }
 111
 112 static void
 113 scan(void) {
 114         unsigned int i, num;
 115         Window *wins, d1, d2;
 116         XWindowAttributes wa;
 117
 118         wins = NULL;
 119         if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
 120                 for(i = 0; i < num; i++) {
 121                         if(!XGetWindowAttributes(dpy, wins[i], &wa)
 122                         || wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
 123                                 continue;
 124                         if(wa.map_state == IsViewable)
 125                                 manage(wins[i], &wa);
 126                 }
 127         }
 128         if(wins)
 129                 XFree(wins);
 130 }
 131
 132 static void
 133 setup(void) {
 134         int i, j;
 135         unsigned int mask;
 136         Window w;
 137         XModifierKeymap *modmap;
 138         XSetWindowAttributes wa;
 139
 140         /* init atoms */
 141         wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
 142         wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
 143         wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
 144         netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
 145         netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
 146         XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
 147                         PropModeReplace, (unsigned char *) netatom, NetLast);
 148         /* init cursors */
 149         cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
 150         cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
 151         cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
 152         /* init modifier map */
 153         numlockmask = 0;
 154         modmap = XGetModifierMapping(dpy);
 155         for (i = 0; i < 8; i++)
 156                 for (j = 0; j < modmap->max_keypermod; j++) {
 157                         if(modmap->modifiermap[i * modmap->max_keypermod + j]
 158                                         == XKeysymToKeycode(dpy, XK_Num_Lock))
 159                                 numlockmask = (1 << i);
 160                 }
 161         XFreeModifiermap(modmap);
 162         /* select for events */
 163         wa.event_mask = SubstructureRedirectMask | SubstructureNotifyMask
 164                 | EnterWindowMask | LeaveWindowMask | StructureNotifyMask;
 165         wa.cursor = cursor[CurNormal];
 166         XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);
 167         XSelectInput(dpy, root, wa.event_mask);
 168         grabkeys();
 169         compileregs();
 170         for(ntags = 0; tags[ntags]; ntags++);
 171         seltag = emallocz(sizeof(Bool) * ntags);
 172         seltag[0] = True;
 173         /* style */
 174         dc.norm[ColBorder] = initcolor(NORMBORDERCOLOR);
 175         dc.norm[ColBG] = initcolor(NORMBGCOLOR);
 176         dc.norm[ColFG] = initcolor(NORMFGCOLOR);
 177         dc.sel[ColBorder] = initcolor(SELBORDERCOLOR);
 178         dc.sel[ColBG] = initcolor(SELBGCOLOR);
 179         dc.sel[ColFG] = initcolor(SELFGCOLOR);
 180         initfont(FONT);
 181         /* geometry */
 182         sx = sy = 0;
 183         sw = DisplayWidth(dpy, screen);
 184         sh = DisplayHeight(dpy, screen);
 185         initlayouts();
 186         /* bar */
 187         dc.h = bh = dc.font.height + 2;
 188         wa.override_redirect = 1;
 189         wa.background_pixmap = ParentRelative;
 190         wa.event_mask = ButtonPressMask | ExposureMask;
 191         barwin = XCreateWindow(dpy, root, sx, sy, sw, bh, 0,
 192                         DefaultDepth(dpy, screen), CopyFromParent, DefaultVisual(dpy, screen),
 193                         CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
 194         XDefineCursor(dpy, barwin, cursor[CurNormal]);
 195         bpos = BARPOS;
 196         updatebarpos();
 197         XMapRaised(dpy, barwin);
 198         strcpy(stext, "dwm-"VERSION);
 199         /* pixmap for everything */
 200         dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
 201         dc.gc = XCreateGC(dpy, root, 0, 0);
 202         XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
 203         if(!dc.font.set)
 204                 XSetFont(dpy, dc.gc, dc.font.xfont->fid);
 205         /* multihead support */
 206         selscreen = XQueryPointer(dpy, root, &w, &w, &i, &i, &i, &i, &mask);
 207 }
 208
 209 /*
 210  * Startup Error handler to check if another window manager
 211  * is already running.
 212  */
 213 static int
 214 xerrorstart(Display *dsply, XErrorEvent *ee) {
 215         otherwm = True;
 216         return -1;
 217 }
 218
 219 /* extern */
 220
 221 void
 222 quit(const char *arg) {
 223         readin = running = False;
 224 }
 225
 226 void
 227 updatebarpos(void) {
 228         XEvent ev;
 229
 230         wax = sx;
 231         way = sy;
 232         wah = sh;
 233         waw = sw;
 234         switch(bpos) {
 235         default:
 236                 wah -= bh;
 237                 way += bh;
 238                 XMoveWindow(dpy, barwin, sx, sy);
 239                 break;
 240         case BarBot:
 241                 wah -= bh;
 242                 XMoveWindow(dpy, barwin, sx, sy + wah);
 243                 break;
 244         case BarOff:
 245                 XMoveWindow(dpy, barwin, sx, sy - bh);
 246                 break;
 247         }
 248         XSync(dpy, False);
 249         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
 250 }
 251
 252 /* There's no way to check accesses to destroyed windows, thus those cases are
 253  * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
 254  * default error handler, which may call exit.
 255  */
 256 int
 257 xerror(Display *dpy, XErrorEvent *ee) {
 258         if(ee->error_code == BadWindow
 259         || (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
 260         || (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
 261         || (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
 262         || (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
 263         || (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
 264         || (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
 265         || (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
 266                 return 0;
 267         fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
 268                 ee->request_code, ee->error_code);
 269         return xerrorxlib(dpy, ee); /* may call exit */
 270 }
 271
 272 int
 273 main(int argc, char *argv[]) {
 274         char *p;
 275         int r, xfd;
 276         fd_set rd;
 277         XEvent ev;
 278
 279         if(argc == 2 && !strcmp("-v", argv[1]))
 280                 eprint("dwm-"VERSION", © 2006-2007 A. R. Garbe, S. van Dijk, J. Salmi, P. Hruby, S. Nagy\n");
 281         else if(argc != 1)
 282                 eprint("usage: dwm [-v]\n");
 283         setlocale(LC_CTYPE, "");
 284         if(!(dpy = XOpenDisplay(0)))
 285                 eprint("dwm: cannot open display\n");
 286         xfd = ConnectionNumber(dpy);
 287         screen = DefaultScreen(dpy);
 288         root = RootWindow(dpy, screen);
 289         otherwm = False;
 290         XSetErrorHandler(xerrorstart);
 291         /* this causes an error if some other window manager is running */
 292         XSelectInput(dpy, root, SubstructureRedirectMask);
 293         XSync(dpy, False);
 294         if(otherwm)
 295                 eprint("dwm: another window manager is already running\n");
 296
 297         XSync(dpy, False);
 298         XSetErrorHandler(NULL);
 299         xerrorxlib = XSetErrorHandler(xerror);
 300         XSync(dpy, False);
 301         setup();
 302         drawstatus();
 303         scan();
 304
 305         /* main event loop, also reads status text from stdin */
 306         XSync(dpy, False);
 307         readin = True;
 308         while(running) {
 309                 FD_ZERO(&rd);
 310                 if(readin)
 311                         FD_SET(STDIN_FILENO, &rd);
 312                 FD_SET(xfd, &rd);
 313                 if(select(xfd + 1, &rd, NULL, NULL, NULL) == -1) {
 314                         if(errno == EINTR)
 315                                 continue;
 316                         eprint("select failed\n");
 317                 }
 318                 if(FD_ISSET(STDIN_FILENO, &rd)) {
 319                         switch(r = read(STDIN_FILENO, stext, sizeof stext - 1)) {
 320                         case -1:
 321                                 strncpy(stext, strerror(errno), sizeof stext - 1);
 322                                 stext[sizeof stext - 1] = '\0';
 323                                 readin = False;
 324                                 break;
 325                         case 0:
 326                                 strncpy(stext, "EOF", 4);
 327                                 readin = False;
 328                                 break;
 329                         default:
 330                                 for(stext[r] = '\0', p = stext + strlen(stext) - 1; p >= stext && *p == '\n'; *p-- = '\0');
 331                                 for(; p >= stext && *p != '\n'; --p);
 332                                 if(p > stext)
 333                                         strncpy(stext, p + 1, sizeof stext);
 334                         }
 335                         drawstatus();
 336                 }
 337                 while(XPending(dpy)) {
 338                         XNextEvent(dpy, &ev);
 339                         if(handler[ev.type])
 340                                 (handler[ev.type])(&ev); /* call handler */
 341                 }
 342         }
 343         cleanup();
 344         XCloseDisplay(dpy);
 345         return 0;
 346 }