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
   8 #include <errno.h>
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11 #include <string.h>
  12 #include <unistd.h>
  13 #include <X11/cursorfont.h>
  14 #include <X11/Xatom.h>
  15 #include <X11/Xproto.h>
  16
  17
  18 /* static */
  19
  20 static Bool otherwm;
  21 static int (*xerrorxlib)(Display *, XErrorEvent *);
  22
  23 static void
  24 cleanup()
  25 {
  26         while(sel) {
  27                 resize(sel, True);
  28                 unmanage(sel);
  29         }
  30         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
  31 }
  32
  33 static void
  34 scan()
  35 {
  36         unsigned int i, num;
  37         Window *wins;
  38         XWindowAttributes wa;
  39         Window d1, d2;
  40
  41         if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
  42                 for(i = 0; i < num; i++) {
  43                         if(!XGetWindowAttributes(dpy, wins[i], &wa))
  44                                 continue;
  45                         if(wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
  46                                 continue;
  47                         if(wa.map_state == IsViewable)
  48                                 manage(wins[i], &wa);
  49                 }
  50         }
  51         if(wins)
  52                 XFree(wins);
  53 }
  54
  55 static int
  56 win_property(Window w, Atom a, Atom t, long l, unsigned char **prop)
  57 {
  58         Atom real;
  59         int format;
  60         unsigned long res, extra;
  61         int status;
  62
  63         status = XGetWindowProperty(dpy, w, a, 0L, l, False, t, &real, &format,
  64                         &res, &extra, prop);
  65
  66         if(status != Success || *prop == 0) {
  67                 return 0;
  68         }
  69         if(res == 0) {
  70                 free((void *) *prop);
  71         }
  72         return res;
  73 }
  74
  75 /*
  76  * Startup Error handler to check if another window manager
  77  * is already running.
  78  */
  79 static int
  80 xerrorstart(Display *dsply, XErrorEvent *ee)
  81 {
  82         otherwm = True;
  83         return -1;
  84 }
  85
  86 /* extern */
  87
  88 char stext[1024];
  89 int tsel = Tdev; /* default tag */
  90 int screen, sx, sy, sw, sh, bx, by, bw, bh, mw;
  91 Atom wmatom[WMLast], netatom[NetLast];
  92 Bool running = True;
  93 Bool issel = True;
  94 Client *clients = NULL;
  95 Client *sel = NULL;
  96 Cursor cursor[CurLast];
  97 Display *dpy;
  98 DC dc = {0};
  99 Window root, barwin;
 100
 101 int
 102 getproto(Window w)
 103 {
 104         unsigned char *protocols;
 105         long res;
 106         int protos = 0;
 107         int i;
 108
 109         res = win_property(w, wmatom[WMProtocols], XA_ATOM, 20L, &protocols);
 110         if(res <= 0) {
 111                 return protos;
 112         }
 113         for(i = 0; i < res; i++) {
 114                 if(protocols[i] == wmatom[WMDelete])
 115                         protos |= WM_PROTOCOL_DELWIN;
 116         }
 117         free((char *) protocols);
 118         return protos;
 119 }
 120
 121 void
 122 sendevent(Window w, Atom a, long value)
 123 {
 124         XEvent e;
 125
 126         e.type = ClientMessage;
 127         e.xclient.window = w;
 128         e.xclient.message_type = a;
 129         e.xclient.format = 32;
 130         e.xclient.data.l[0] = value;
 131         e.xclient.data.l[1] = CurrentTime;
 132         XSendEvent(dpy, w, False, NoEventMask, &e);
 133         XSync(dpy, False);
 134 }
 135
 136 void
 137 quit(Arg *arg)
 138 {
 139         running = False;
 140 }
 141
 142 /*
 143  * There's no way to check accesses to destroyed windows, thus those cases are
 144  * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
 145  * default error handler, which calls exit().
 146  */
 147 int
 148 xerror(Display *dpy, XErrorEvent *ee)
 149 {
 150         if(ee->error_code == BadWindow
 151                         || (ee->request_code == X_SetInputFocus
 152                                 && ee->error_code == BadMatch)
 153                         || (ee->request_code == X_PolyText8
 154                                 && ee->error_code == BadDrawable)
 155                         || (ee->request_code == X_PolyFillRectangle
 156                                 && ee->error_code == BadDrawable)
 157                         || (ee->request_code == X_PolySegment
 158                                 && ee->error_code == BadDrawable)
 159                         || (ee->request_code == X_ConfigureWindow
 160                                 && ee->error_code == BadMatch)
 161                         || (ee->request_code == X_GrabKey
 162                                 && ee->error_code == BadAccess))
 163                 return 0;
 164         fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
 165                         ee->request_code, ee->error_code);
 166         return xerrorxlib(dpy, ee); /* may call exit() */
 167 }
 168
 169 int
 170 main(int argc, char *argv[])
 171 {
 172         int i, n;
 173         fd_set rd;
 174         XSetWindowAttributes wa;
 175         unsigned int mask;
 176         Bool readstdin = True;
 177         Window w;
 178         XEvent ev;
 179
 180         for(i = 1; (i < argc) && (argv[i][0] == '-'); i++) {
 181                 switch (argv[i][1]) {
 182                 default:
 183                         eprint("usage: dwm [-v]\n");
 184                         break;
 185                 case 'v':
 186                         fputs("dwm-"VERSION", (C)opyright MMVI Anselm R. Garbe\n", stdout);
 187                         exit(EXIT_SUCCESS);
 188                         break;
 189                 }
 190         }
 191
 192         dpy = XOpenDisplay(0);
 193         if(!dpy)
 194                 eprint("dwm: cannot connect X server\n");
 195
 196         screen = DefaultScreen(dpy);
 197         root = RootWindow(dpy, screen);
 198
 199         /* check if another WM is already running */
 200         otherwm = False;
 201         XSetErrorHandler(xerrorstart);
 202         /* this causes an error if some other WM is running */
 203         XSelectInput(dpy, root, SubstructureRedirectMask);
 204         XSync(dpy, False);
 205
 206         if(otherwm)
 207                 eprint("dwm: another window manager is already running\n");
 208
 209         XSetErrorHandler(NULL);
 210         xerrorxlib = XSetErrorHandler(xerror);
 211
 212         /* init atoms */
 213         wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
 214         wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
 215         netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
 216         netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
 217         XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
 218                         PropModeReplace, (unsigned char *) netatom, NetLast);
 219
 220         /* init cursors */
 221         cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
 222         cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
 223         cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
 224
 225         grabkeys();
 226
 227         /* style */
 228         dc.bg = getcolor(BGCOLOR);
 229         dc.fg = getcolor(FGCOLOR);
 230         dc.border = getcolor(BORDERCOLOR);
 231         setfont(FONT);
 232
 233         sx = sy = 0;
 234         sw = DisplayWidth(dpy, screen);
 235         sh = DisplayHeight(dpy, screen);
 236         mw = (sw * MASTERW) / 100;
 237
 238         wa.override_redirect = 1;
 239         wa.background_pixmap = ParentRelative;
 240         wa.event_mask = ButtonPressMask | ExposureMask;
 241
 242         bx = by = 0;
 243         bw = sw;
 244         dc.h = bh = dc.font.height + 4;
 245         barwin = XCreateWindow(dpy, root, bx, by, bw, bh, 0, DefaultDepth(dpy, screen),
 246                         CopyFromParent, DefaultVisual(dpy, screen),
 247                         CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
 248         XDefineCursor(dpy, barwin, cursor[CurNormal]);
 249         XMapRaised(dpy, barwin);
 250
 251         dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
 252         dc.gc = XCreateGC(dpy, root, 0, 0);
 253         drawstatus();
 254
 255         issel = XQueryPointer(dpy, root, &w, &w, &i, &i, &i, &i, &mask);
 256
 257         wa.event_mask = SubstructureRedirectMask | EnterWindowMask \
 258                                         | LeaveWindowMask;
 259         wa.cursor = cursor[CurNormal];
 260
 261         XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);
 262
 263         strcpy(stext, "dwm-"VERSION);
 264
 265         scan();
 266
 267         /* main event loop, reads status text from stdin as well */
 268 Mainloop:
 269         while(running) {
 270                 FD_ZERO(&rd);
 271                 if(readstdin)
 272                         FD_SET(STDIN_FILENO, &rd);
 273                 FD_SET(ConnectionNumber(dpy), &rd);
 274
 275                 i = select(ConnectionNumber(dpy) + 1, &rd, 0, 0, 0);
 276                 if(i == -1 && errno == EINTR)
 277                         continue;
 278                 if(i < 0)
 279                         eprint("select failed\n");
 280                 else if(i > 0) {
 281                         if(FD_ISSET(ConnectionNumber(dpy), &rd)) {
 282                                 while(XPending(dpy)) {
 283                                         XNextEvent(dpy, &ev);
 284                                         if(handler[ev.type])
 285                                                 (handler[ev.type])(&ev); /* call handler */
 286                                 }
 287                         }
 288                         if(readstdin && FD_ISSET(STDIN_FILENO, &rd)) {
 289                                 i = n = 0;
 290                                 for(;;) {
 291                                         if((i = getchar()) == EOF) {
 292                                                 /* broken pipe/end of producer */
 293                                                 readstdin = False;
 294                                                 strcpy(stext, "broken pipe");
 295                                                 goto Mainloop;
 296                                         }
 297                                         if(i == '\n' || n >= sizeof(stext) - 1)
 298                                                 break;
 299                                         stext[n++] = i;
 300                                 }
 301                                 stext[n] = 0;
 302                                 drawstatus();
 303                         }
 304                 }
 305         }
 306
 307         cleanup();
 308         XCloseDisplay(dpy);
 309
 310         return 0;
 311 }