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 /* static */
  19
  20 static int (*xerrorxlib)(Display *, XErrorEvent *);
  21 static Bool otherwm;
  22
  23 static void
  24 cleanup()
  25 {
  26         while(sel) {
  27                 resize(sel, True, TopLeft);
  28                 unmanage(sel);
  29         }
  30         XUngrabKey(dpy, AnyKey, AnyModifier, root);
  31         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
  32         XSync(dpy, False);
  33 }
  34
  35 static void
  36 scan()
  37 {
  38         unsigned int i, num;
  39         Window *wins, d1, d2;
  40         XWindowAttributes wa;
  41
  42         wins = NULL;
  43         if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
  44                 for(i = 0; i < num; i++) {
  45                         if(!XGetWindowAttributes(dpy, wins[i], &wa))
  46                                 continue;
  47                         if(wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
  48                                 continue;
  49                         if(wa.map_state == IsViewable)
  50                                 manage(wins[i], &wa);
  51                 }
  52         }
  53         if(wins)
  54                 XFree(wins);
  55 }
  56
  57 static int
  58 win_property(Window w, Atom a, Atom t, long l, unsigned char **prop)
  59 {
  60         int status, format;
  61         unsigned long res, extra;
  62         Atom real;
  63
  64         status = XGetWindowProperty(dpy, w, a, 0L, l, False, t, &real, &format,
  65                         &res, &extra, prop);
  66
  67         if(status != Success || *prop == 0) {
  68                 return 0;
  69         }
  70         if(res == 0) {
  71                 free((void *) *prop);
  72         }
  73         return res;
  74 }
  75
  76 /*
  77  * Startup Error handler to check if another window manager
  78  * is already running.
  79  */
  80 static int
  81 xerrorstart(Display *dsply, XErrorEvent *ee)
  82 {
  83         otherwm = True;
  84         return -1;
  85 }
  86
  87 /* extern */
  88
  89 char stext[1024];
  90 Bool *seltag;
  91 int screen, sx, sy, sw, sh, bx, by, bw, bh, mw;
  92 unsigned int ntags, numlockmask;
  93 Atom wmatom[WMLast], netatom[NetLast];
  94 Bool running = True;
  95 Bool issel = True;
  96 Client *clients = NULL;
  97 Client *sel = NULL;
  98 Cursor cursor[CurLast];
  99 Display *dpy;
 100 DC dc = {0};
 101 Window root, barwin;
 102
 103 int
 104 getproto(Window w)
 105 {
 106         int protos = 0;
 107         int i;
 108         long res;
 109         Atom *protocols;
 110
 111         res = win_property(w, wmatom[WMProtocols], XA_ATOM, 20L,
 112                         ((unsigned char **)&protocols));
 113         if(res <= 0) {
 114                 return protos;
 115         }
 116         for(i = 0; i < res; i++) {
 117                 if(protocols[i] == wmatom[WMDelete])
 118                         protos |= PROTODELWIN;
 119         }
 120         free((char *) protocols);
 121         return protos;
 122 }
 123
 124 void
 125 sendevent(Window w, Atom a, long value)
 126 {
 127         XEvent e;
 128
 129         e.type = ClientMessage;
 130         e.xclient.window = w;
 131         e.xclient.message_type = a;
 132         e.xclient.format = 32;
 133         e.xclient.data.l[0] = value;
 134         e.xclient.data.l[1] = CurrentTime;
 135         XSendEvent(dpy, w, False, NoEventMask, &e);
 136         XSync(dpy, False);
 137 }
 138
 139 void
 140 quit(Arg *arg)
 141 {
 142         running = False;
 143 }
 144
 145 /*
 146  * There's no way to check accesses to destroyed windows, thus those cases are
 147  * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
 148  * default error handler, which calls exit().
 149  */
 150 int
 151 xerror(Display *dpy, XErrorEvent *ee)
 152 {
 153         if(ee->error_code == BadWindow
 154         || (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
 155         || (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
 156         || (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
 157         || (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
 158         || (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
 159         || (ee->request_code == X_GrabKey && ee->error_code == BadAccess))
 160                 return 0;
 161         fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
 162                 ee->request_code, ee->error_code);
 163         return xerrorxlib(dpy, ee); /* may call exit() */
 164 }
 165
 166 int
 167 main(int argc, char *argv[])
 168 {
 169         int i, j, xfd;
 170         unsigned int mask;
 171         fd_set rd;
 172         Bool readin = True;
 173         Window w;
 174         XModifierKeymap *modmap;
 175         XSetWindowAttributes wa;
 176
 177         if(argc == 2 && !strncmp("-v", argv[1], 3)) {
 178                 fputs("dwm-"VERSION", (C)opyright MMVI Anselm R. Garbe\n", stdout);
 179                 exit(EXIT_SUCCESS);
 180         }
 181         else if(argc != 1)
 182                 eprint("usage: dwm [-v]\n");
 183
 184         dpy = XOpenDisplay(0);
 185         if(!dpy)
 186                 eprint("dwm: cannot open display\n");
 187
 188         xfd = ConnectionNumber(dpy);
 189         screen = DefaultScreen(dpy);
 190         root = RootWindow(dpy, screen);
 191
 192         otherwm = False;
 193         XSetErrorHandler(xerrorstart);
 194         /* this causes an error if some other window manager is running */
 195         XSelectInput(dpy, root, SubstructureRedirectMask);
 196         XSync(dpy, False);
 197
 198         if(otherwm)
 199                 eprint("dwm: another window manager is already running\n");
 200
 201         XSync(dpy, False);
 202         XSetErrorHandler(NULL);
 203         xerrorxlib = XSetErrorHandler(xerror);
 204         XSync(dpy, False);
 205
 206         /* init atoms */
 207         wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
 208         wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
 209         netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
 210         netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
 211         XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
 212                         PropModeReplace, (unsigned char *) netatom, NetLast);
 213
 214         /* init cursors */
 215         cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
 216         cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
 217         cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
 218
 219         modmap = XGetModifierMapping(dpy);
 220         for (i = 0; i < 8; i++) {
 221                 for (j = 0; j < modmap->max_keypermod; j++) {
 222                         if(modmap->modifiermap[i * modmap->max_keypermod + j] == XKeysymToKeycode(dpy, XK_Num_Lock))
 223                                 numlockmask = (1 << i);
 224                 }
 225         }
 226         XFree(modmap);
 227
 228         wa.event_mask = SubstructureRedirectMask | SubstructureNotifyMask | EnterWindowMask | LeaveWindowMask;
 229         wa.cursor = cursor[CurNormal];
 230         XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);
 231
 232         grabkeys();
 233         initrregs();
 234
 235         for(ntags = 0; tags[ntags]; ntags++);
 236         seltag = emallocz(sizeof(Bool) * ntags);
 237         seltag[DEFTAG] = True;
 238
 239         /* style */
 240         dc.bg = getcolor(BGCOLOR);
 241         dc.fg = getcolor(FGCOLOR);
 242         dc.border = getcolor(BORDERCOLOR);
 243         setfont(FONT);
 244
 245         sx = sy = 0;
 246         sw = DisplayWidth(dpy, screen);
 247         sh = DisplayHeight(dpy, screen);
 248         mw = (sw * MASTERW) / 100;
 249
 250         bx = by = 0;
 251         bw = sw;
 252         dc.h = bh = dc.font.height + 4;
 253         wa.override_redirect = 1;
 254         wa.background_pixmap = ParentRelative;
 255         wa.event_mask = ButtonPressMask | ExposureMask;
 256         barwin = XCreateWindow(dpy, root, bx, by, bw, bh, 0, DefaultDepth(dpy, screen),
 257                         CopyFromParent, DefaultVisual(dpy, screen),
 258                         CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
 259         XDefineCursor(dpy, barwin, cursor[CurNormal]);
 260         XMapRaised(dpy, barwin);
 261
 262         dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
 263         dc.gc = XCreateGC(dpy, root, 0, 0);
 264
 265         strcpy(stext, "dwm-"VERSION);
 266         drawstatus();
 267
 268         issel = XQueryPointer(dpy, root, &w, &w, &i, &i, &i, &i, &mask);
 269
 270         scan();
 271
 272         /* main event loop, also reads status text from stdin */
 273         XSync(dpy, False);
 274         procevent();
 275         while(running) {
 276                 FD_ZERO(&rd);
 277                 if(readin)
 278                         FD_SET(STDIN_FILENO, &rd);
 279                 FD_SET(xfd, &rd);
 280                 i = select(xfd + 1, &rd, NULL, NULL, NULL);
 281                 if(i == -1 && errno == EINTR)
 282                         continue;
 283                 if(i < 0)
 284                         eprint("select failed\n");
 285                 else if(i > 0) {
 286                         if(readin && FD_ISSET(STDIN_FILENO, &rd)) {
 287                                 readin = NULL != fgets(stext, sizeof(stext), stdin);
 288                                 if(readin)
 289                                         stext[strlen(stext) - 1] = 0;
 290                                 else
 291                                         strcpy(stext, "broken pipe");
 292                                 drawstatus();
 293                         }
 294                 }
 295                 procevent();
 296         }
 297         cleanup();
 298         XCloseDisplay(dpy);
 299
 300         return 0;
 301 }