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