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