main.c

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