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 #include <X11/Xutil.h>
  15
  16 /* extern */
  17
  18 char stext[256];
  19 int screen, sx, sy, sw, sh, wax, way, waw, wah;
  20 unsigned int ntags;
  21 unsigned int numlockmask = 0;
  22 Atom wmatom[WMLast], netatom[NetLast];
  23 Bool *seltags;
  24 Bool selscreen = True;
  25 Client *clients = NULL;
  26 Client *sel = NULL;
  27 Client *stack = NULL;
  28 Cursor cursor[CurLast];
  29 Display *dpy;
  30 Window root;
  31
  32 /* static */
  33
  34 static int (*xerrorxlib)(Display *, XErrorEvent *);
  35 static Bool otherwm, readin;
  36 static Bool running = True;
  37
  38 static void
  39 cleanup(void) {
  40         close(STDIN_FILENO);
  41         while(stack) {
  42                 unban(stack);
  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(seltags);
  59 }
  60
  61 static long
  62 getstate(Window w) {
  63         int format, status;
  64         long result = -1;
  65         unsigned char *p = NULL;
  66         unsigned long n, extra;
  67         Atom real;
  68
  69         status = XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
  70                         &real, &format, &n, &extra, (unsigned char **)&p);
  71         if(status != Success)
  72                 return -1;
  73         if(n != 0)
  74                 result = *p;
  75         XFree(p);
  76         return result;
  77 }
  78
  79 static void
  80 scan(void) {
  81         unsigned int i, num;
  82         Window *wins, d1, d2;
  83         XWindowAttributes wa;
  84
  85         wins = NULL;
  86         if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
  87                 for(i = 0; i < num; i++) {
  88                         if(!XGetWindowAttributes(dpy, wins[i], &wa)
  89                         || wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
  90                                 continue;
  91                         if(wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
  92                                 manage(wins[i], &wa);
  93                 }
  94                 for(i = 0; i < num; i++) { /* now the transients */
  95                         if(!XGetWindowAttributes(dpy, wins[i], &wa))
  96                                 continue;
  97                         if(XGetTransientForHint(dpy, wins[i], &d1)
  98                         && (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
  99                                 manage(wins[i], &wa);
 100                 }
 101         }
 102         if(wins)
 103                 XFree(wins);
 104 }
 105
 106 static void
 107 setup(void) {
 108         int i, j;
 109         unsigned int mask;
 110         Window w;
 111         XModifierKeymap *modmap;
 112         XSetWindowAttributes wa;
 113
 114         /* init atoms */
 115         wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
 116         wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
 117         wmatom[WMName] = XInternAtom(dpy, "WM_NAME", False);
 118         wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
 119         netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
 120         netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
 121         XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
 122                         PropModeReplace, (unsigned char *) netatom, NetLast);
 123         /* init cursors */
 124         cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
 125         cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
 126         cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
 127         /* init modifier map */
 128         modmap = XGetModifierMapping(dpy);
 129         for (i = 0; i < 8; i++)
 130                 for (j = 0; j < modmap->max_keypermod; j++) {
 131                         if(modmap->modifiermap[i * modmap->max_keypermod + j]
 132                                         == XKeysymToKeycode(dpy, XK_Num_Lock))
 133                                 numlockmask = (1 << i);
 134                 }
 135         XFreeModifiermap(modmap);
 136         /* select for events */
 137         wa.event_mask = SubstructureRedirectMask | SubstructureNotifyMask
 138                 | EnterWindowMask | LeaveWindowMask | StructureNotifyMask;
 139         wa.cursor = cursor[CurNormal];
 140         XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);
 141         XSelectInput(dpy, root, wa.event_mask);
 142         grabkeys();
 143         compileregs();
 144         for(ntags = 0; tags[ntags]; ntags++);
 145         seltags = emallocz(sizeof(Bool) * ntags);
 146         seltags[0] = True;
 147         /* geometry */
 148         sx = sy = 0;
 149         sw = DisplayWidth(dpy, screen);
 150         sh = DisplayHeight(dpy, screen);
 151         initlayouts();
 152         initbar();
 153         /* multihead support */
 154         selscreen = XQueryPointer(dpy, root, &w, &w, &i, &i, &i, &i, &mask);
 155 }
 156
 157 /*
 158  * Startup Error handler to check if another window manager
 159  * is already running.
 160  */
 161 static int
 162 xerrorstart(Display *dsply, XErrorEvent *ee) {
 163         otherwm = True;
 164         return -1;
 165 }
 166
 167 /* extern */
 168
 169 Bool
 170 gettextprop(Window w, Atom atom, char *text, unsigned int size) {
 171         char **list = NULL;
 172         int n;
 173         XTextProperty name;
 174
 175         if(!text || size == 0)
 176                 return False;
 177         text[0] = '\0';
 178         XGetTextProperty(dpy, w, &name, atom);
 179         if(!name.nitems)
 180                 return False;
 181         if(name.encoding == XA_STRING)
 182                 strncpy(text, (char *)name.value, size - 1);
 183         else {
 184                 if(XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success
 185                 && n > 0 && *list)
 186                 {
 187                         strncpy(text, *list, size - 1);
 188                         XFreeStringList(list);
 189                 }
 190         }
 191         text[size - 1] = '\0';
 192         XFree(name.value);
 193         return True;
 194 }
 195
 196 void
 197 quit(const char *arg) {
 198         readin = running = False;
 199 }
 200
 201 /* There's no way to check accesses to destroyed windows, thus those cases are
 202  * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
 203  * default error handler, which may call exit.
 204  */
 205 int
 206 xerror(Display *dpy, XErrorEvent *ee) {
 207         if(ee->error_code == BadWindow
 208         || (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
 209         || (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
 210         || (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
 211         || (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
 212         || (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
 213         || (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
 214         || (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
 215                 return 0;
 216         fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
 217                 ee->request_code, ee->error_code);
 218         return xerrorxlib(dpy, ee); /* may call exit */
 219 }
 220
 221 int
 222 main(int argc, char *argv[]) {
 223         char *p;
 224         int r, xfd;
 225         fd_set rd;
 226         XEvent ev;
 227
 228         if(argc == 2 && !strcmp("-v", argv[1]))
 229                 eprint("dwm-"VERSION", © 2006-2007 A. R. Garbe, S. van Dijk, J. Salmi, P. Hruby, S. Nagy\n");
 230         else if(argc != 1)
 231                 eprint("usage: dwm [-v]\n");
 232         setlocale(LC_CTYPE, "");
 233         if(!(dpy = XOpenDisplay(0)))
 234                 eprint("dwm: cannot open display\n");
 235         xfd = ConnectionNumber(dpy);
 236         screen = DefaultScreen(dpy);
 237         root = RootWindow(dpy, screen);
 238         otherwm = False;
 239         XSetErrorHandler(xerrorstart);
 240         /* this causes an error if some other window manager is running */
 241         XSelectInput(dpy, root, SubstructureRedirectMask);
 242         XSync(dpy, False);
 243         if(otherwm)
 244                 eprint("dwm: another window manager is already running\n");
 245
 246         XSync(dpy, False);
 247         XSetErrorHandler(NULL);
 248         xerrorxlib = XSetErrorHandler(xerror);
 249         XSync(dpy, False);
 250         setup();
 251         drawbar();
 252         scan();
 253
 254         /* main event loop, also reads status text from stdin */
 255         XSync(dpy, False);
 256         readin = True;
 257         while(running) {
 258                 FD_ZERO(&rd);
 259                 if(readin)
 260                         FD_SET(STDIN_FILENO, &rd);
 261                 FD_SET(xfd, &rd);
 262                 if(select(xfd + 1, &rd, NULL, NULL, NULL) == -1) {
 263                         if(errno == EINTR)
 264                                 continue;
 265                         eprint("select failed\n");
 266                 }
 267                 if(FD_ISSET(STDIN_FILENO, &rd)) {
 268                         switch(r = read(STDIN_FILENO, stext, sizeof stext - 1)) {
 269                         case -1:
 270                                 strncpy(stext, strerror(errno), sizeof stext - 1);
 271                                 stext[sizeof stext - 1] = '\0';
 272                                 readin = False;
 273                                 break;
 274                         case 0:
 275                                 strncpy(stext, "EOF", 4);
 276                                 readin = False;
 277                                 break;
 278                         default:
 279                                 for(stext[r] = '\0', p = stext + strlen(stext) - 1; p >= stext && *p == '\n'; *p-- = '\0');
 280                                 for(; p >= stext && *p != '\n'; --p);
 281                                 if(p > stext)
 282                                         strncpy(stext, p + 1, sizeof stext);
 283                         }
 284                         drawbar();
 285                 }
 286                 while(XPending(dpy)) {
 287                         XNextEvent(dpy, &ev);
 288                         if(handler[ev.type])
 289                                 (handler[ev.type])(&ev); /* call handler */
 290                 }
 291         }
 292         cleanup();
 293         XCloseDisplay(dpy);
 294         return 0;
 295 }