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