main.c

   1 /*
   2  * (C)opyright MMVI Anselm R. Garbe <garbeam at gmail dot com>
   3  * See LICENSE file for license details.
   4  */
   5
   6 #include "dwm.h"
   7 #include <errno.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[1024];
  21 Bool *seltag;
  22 int screen, sx, sy, sw, sh, bx, by, bw, bh, mw;
  23 unsigned int ntags, numlockmask;
  24 Atom wmatom[WMLast], netatom[NetLast];
  25 Bool running = True;
  26 Bool issel = True;
  27 Client *clients = NULL;
  28 Client *sel = NULL;
  29 Cursor cursor[CurLast];
  30 Display *dpy;
  31 DC dc = {0};
  32 Window root, barwin;
  33
  34 /* static */
  35
  36 static int (*xerrorxlib)(Display *, XErrorEvent *);
  37 static Bool otherwm, readin;
  38
  39 static void
  40 cleanup()
  41 {
  42         close(STDIN_FILENO);
  43         while(sel) {
  44                 resize(sel, True, TopLeft);
  45                 unmanage(sel);
  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         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
  56         XSync(dpy, False);
  57 }
  58
  59 static void
  60 scan()
  61 {
  62         unsigned int i, num;
  63         Window *wins, d1, d2;
  64         XWindowAttributes wa;
  65
  66         wins = NULL;
  67         if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
  68                 for(i = 0; i < num; i++) {
  69                         if(!XGetWindowAttributes(dpy, wins[i], &wa))
  70                                 continue;
  71                         if(wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
  72                                 continue;
  73                         if(wa.map_state == IsViewable)
  74                                 manage(wins[i], &wa);
  75                 }
  76         }
  77         if(wins)
  78                 XFree(wins);
  79 }
  80
  81 static void
  82 setup()
  83 {
  84         int i, j;
  85         unsigned int mask;
  86         Window w;
  87         XModifierKeymap *modmap;
  88         XSetWindowAttributes wa;
  89
  90         /* init atoms */
  91         wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
  92         wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
  93         netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
  94         netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
  95         XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
  96                         PropModeReplace, (unsigned char *) netatom, NetLast);
  97
  98         /* init cursors */
  99         cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
 100         cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
 101         cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
 102
 103         modmap = XGetModifierMapping(dpy);
 104         for (i = 0; i < 8; i++) {
 105                 for (j = 0; j < modmap->max_keypermod; j++) {
 106                         if(modmap->modifiermap[i * modmap->max_keypermod + j] == XKeysymToKeycode(dpy, XK_Num_Lock))
 107                                 numlockmask = (1 << i);
 108                 }
 109         }
 110         XFree(modmap);
 111
 112         wa.event_mask = SubstructureRedirectMask | SubstructureNotifyMask | EnterWindowMask | LeaveWindowMask;
 113         wa.cursor = cursor[CurNormal];
 114         XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);
 115
 116         grabkeys();
 117         initrregs();
 118
 119         for(ntags = 0; tags[ntags]; ntags++);
 120         seltag = emallocz(sizeof(Bool) * ntags);
 121         seltag[0] = True;
 122
 123         /* style */
 124         dc.bg = getcolor(BGCOLOR);
 125         dc.fg = getcolor(FGCOLOR);
 126         dc.border = getcolor(BORDERCOLOR);
 127         setfont(FONT);
 128
 129         sx = sy = 0;
 130         sw = DisplayWidth(dpy, screen);
 131         sh = DisplayHeight(dpy, screen);
 132         mw = (sw * MASTERW) / 100;
 133
 134         bx = by = 0;
 135         bw = sw;
 136         dc.h = bh = dc.font.height + 4;
 137         wa.override_redirect = 1;
 138         wa.background_pixmap = ParentRelative;
 139         wa.event_mask = ButtonPressMask | ExposureMask;
 140         barwin = XCreateWindow(dpy, root, bx, by, bw, bh, 0, DefaultDepth(dpy, screen),
 141                         CopyFromParent, DefaultVisual(dpy, screen),
 142                         CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
 143         XDefineCursor(dpy, barwin, cursor[CurNormal]);
 144         XMapRaised(dpy, barwin);
 145
 146         dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
 147         dc.gc = XCreateGC(dpy, root, 0, 0);
 148
 149         issel = XQueryPointer(dpy, root, &w, &w, &i, &i, &i, &i, &mask);
 150
 151         strcpy(stext, "dwm-"VERSION);
 152 }
 153
 154 /*
 155  * Startup Error handler to check if another window manager
 156  * is already running.
 157  */
 158 static int
 159 xerrorstart(Display *dsply, XErrorEvent *ee)
 160 {
 161         otherwm = True;
 162         return -1;
 163 }
 164
 165 /* extern */
 166
 167 int
 168 getproto(Window w)
 169 {
 170         int i, format, protos, status;
 171         unsigned long extra, res;
 172         Atom *protocols, real;
 173
 174         protos = 0;
 175         status = XGetWindowProperty(dpy, w, wmatom[WMProtocols], 0L, 20L, False,
 176                         XA_ATOM, &real, &format, &res, &extra, (unsigned char **)&protocols);
 177         if(status != Success || protocols == 0)
 178                 return protos;
 179         for(i = 0; i < res; i++)
 180                 if(protocols[i] == wmatom[WMDelete])
 181                         protos |= PROTODELWIN;
 182         free(protocols);
 183         return protos;
 184 }
 185
 186 void
 187 sendevent(Window w, Atom a, long value)
 188 {
 189         XEvent e;
 190
 191         e.type = ClientMessage;
 192         e.xclient.window = w;
 193         e.xclient.message_type = a;
 194         e.xclient.format = 32;
 195         e.xclient.data.l[0] = value;
 196         e.xclient.data.l[1] = CurrentTime;
 197         XSendEvent(dpy, w, False, NoEventMask, &e);
 198         XSync(dpy, False);
 199 }
 200
 201 void
 202 quit(Arg *arg)
 203 {
 204         readin = running = False;
 205 }
 206
 207 /*
 208  * There's no way to check accesses to destroyed windows, thus those cases are
 209  * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
 210  * default error handler, which calls exit().
 211  */
 212 int
 213 xerror(Display *dpy, XErrorEvent *ee)
 214 {
 215         if(ee->error_code == BadWindow
 216         || (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
 217         || (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
 218         || (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
 219         || (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
 220         || (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
 221         || (ee->request_code == X_GrabKey && ee->error_code == BadAccess))
 222                 return 0;
 223         fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
 224                 ee->request_code, ee->error_code);
 225         return xerrorxlib(dpy, ee); /* may call exit() */
 226 }
 227
 228 int
 229 main(int argc, char *argv[])
 230 {
 231         int r, xfd;
 232         fd_set rd;
 233
 234         if(argc == 2 && !strncmp("-v", argv[1], 3)) {
 235                 fputs("dwm-"VERSION", (C)opyright MMVI Anselm R. Garbe\n", stdout);
 236                 exit(EXIT_SUCCESS);
 237         }
 238         else if(argc != 1)
 239                 eprint("usage: dwm [-v]\n");
 240
 241         dpy = XOpenDisplay(0);
 242         if(!dpy)
 243                 eprint("dwm: cannot open display\n");
 244
 245         xfd = ConnectionNumber(dpy);
 246         screen = DefaultScreen(dpy);
 247         root = RootWindow(dpy, screen);
 248
 249         otherwm = False;
 250         XSetErrorHandler(xerrorstart);
 251         /* this causes an error if some other window manager is running */
 252         XSelectInput(dpy, root, SubstructureRedirectMask);
 253         XSync(dpy, False);
 254
 255         if(otherwm)
 256                 eprint("dwm: another window manager is already running\n");
 257
 258         XSync(dpy, False);
 259         XSetErrorHandler(NULL);
 260         xerrorxlib = XSetErrorHandler(xerror);
 261         XSync(dpy, False);
 262
 263         setup();
 264         drawstatus();
 265         scan();
 266
 267         /* main event loop, also reads status text from stdin */
 268         XSync(dpy, False);
 269         procevent();
 270         readin = True;
 271         while(running) {
 272                 FD_ZERO(&rd);
 273                 if(readin)
 274                         FD_SET(STDIN_FILENO, &rd);
 275                 FD_SET(xfd, &rd);
 276                 r = select(xfd + 1, &rd, NULL, NULL, NULL);
 277                 if((r == -1) && (errno == EINTR))
 278                         continue;
 279                 if(r > 0) {
 280                         if(readin && FD_ISSET(STDIN_FILENO, &rd)) {
 281                                 readin = NULL != fgets(stext, sizeof(stext), stdin);
 282                                 if(readin)
 283                                         stext[strlen(stext) - 1] = 0;
 284                                 else
 285                                         strcpy(stext, "broken pipe");
 286                                 drawstatus();
 287                         }
 288                 }
 289                 else if(r < 0)
 290                         eprint("select failed\n");
 291                 procevent();
 292         }
 293         cleanup();
 294         XCloseDisplay(dpy);
 295
 296         return 0;
 297 }