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 <sys/select.h>
  14 #include <X11/cursorfont.h>
  15 #include <X11/Xatom.h>
  16 #include <X11/Xproto.h>
  17
  18
  19 /* static */
  20
  21 static int (*xerrorxlib)(Display *, XErrorEvent *);
  22 static Bool otherwm;
  23
  24 static void
  25 cleanup()
  26 {
  27         while(sel) {
  28                 resize(sel, True, TopLeft);
  29                 unmanage(sel);
  30         }
  31         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
  32 }
  33
  34 static void
  35 scan()
  36 {
  37         unsigned int i, num;
  38         Window *wins, d1, d2;
  39         XWindowAttributes wa;
  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         int status, format;
  59         unsigned long res, extra;
  60         Atom real;
  61
  62         status = XGetWindowProperty(dpy, w, a, 0L, l, False, t, &real, &format,
  63                         &res, &extra, prop);
  64
  65         if(status != Success || *prop == 0) {
  66                 return 0;
  67         }
  68         if(res == 0) {
  69                 free((void *) *prop);
  70         }
  71         return res;
  72 }
  73
  74 /*
  75  * Startup Error handler to check if another window manager
  76  * is already running.
  77  */
  78 static int
  79 xerrorstart(Display *dsply, XErrorEvent *ee)
  80 {
  81         otherwm = True;
  82         return -1;
  83 }
  84
  85 /* extern */
  86
  87 char stext[1024];
  88 /* CUSTOMIZE */
  89 int tsel = Tdev; /* default tag */
  90 /* END CUSTOMIZE */
  91 int screen, sx, sy, sw, sh, bx, by, bw, bh, mw;
  92 Atom wmatom[WMLast], netatom[NetLast];
  93 Bool running = True;
  94 Bool issel = True;
  95 Client *clients = NULL;
  96 Client *sel = NULL;
  97 Cursor cursor[CurLast];
  98 Display *dpy;
  99 DC dc = {0};
 100 Window root, barwin;
 101
 102 int
 103 getproto(Window w)
 104 {
 105         int protos = 0;
 106         int i;
 107         long res;
 108         unsigned char *protocols;
 109
 110         res = win_property(w, wmatom[WMProtocols], XA_ATOM, 20L, &protocols);
 111         if(res <= 0) {
 112                 return protos;
 113         }
 114         for(i = 0; i < res; i++) {
 115                 if(protocols[i] == wmatom[WMDelete])
 116                         protos |= WM_PROTOCOL_DELWIN;
 117         }
 118         free((char *) protocols);
 119         return protos;
 120 }
 121
 122 void
 123 sendevent(Window w, Atom a, long value)
 124 {
 125         XEvent e;
 126
 127         e.type = ClientMessage;
 128         e.xclient.window = w;
 129         e.xclient.message_type = a;
 130         e.xclient.format = 32;
 131         e.xclient.data.l[0] = value;
 132         e.xclient.data.l[1] = CurrentTime;
 133         XSendEvent(dpy, w, False, NoEventMask, &e);
 134         XSync(dpy, False);
 135 }
 136
 137 void
 138 quit(Arg *arg)
 139 {
 140         running = False;
 141 }
 142
 143 /*
 144  * There's no way to check accesses to destroyed windows, thus those cases are
 145  * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
 146  * default error handler, which calls exit().
 147  */
 148 int
 149 xerror(Display *dpy, XErrorEvent *ee)
 150 {
 151         if(ee->error_code == BadWindow
 152         || (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
 153         || (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
 154         || (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
 155         || (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
 156         || (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
 157         || (ee->request_code == X_GrabKey && ee->error_code == BadAccess))
 158                 return 0;
 159         fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
 160                 ee->request_code, ee->error_code);
 161         return xerrorxlib(dpy, ee); /* may call exit() */
 162 }
 163
 164 int
 165 main(int argc, char *argv[])
 166 {
 167         int i;
 168         unsigned int mask;
 169         fd_set rd;
 170         Bool readin = True;
 171         Window w;
 172         XEvent ev;
 173         XSetWindowAttributes wa;
 174
 175         if(argc == 2 && !strncmp("-v", argv[1], 3)) {
 176                 fputs("dwm-"VERSION", (C)opyright MMVI Anselm R. Garbe\n", stdout);
 177                 exit(EXIT_SUCCESS);
 178         }
 179         else if(argc != 1)
 180                 eprint("usage: dwm [-v]\n");
 181
 182         dpy = XOpenDisplay(0);
 183         if(!dpy)
 184                 eprint("dwm: cannot connect X server\n");
 185
 186         screen = DefaultScreen(dpy);
 187         root = RootWindow(dpy, screen);
 188
 189         /* check if another WM is already running */
 190         otherwm = False;
 191         XSetErrorHandler(xerrorstart);
 192         /* this causes an error if some other WM is running */
 193         XSelectInput(dpy, root, SubstructureRedirectMask);
 194         XSync(dpy, False);
 195
 196         if(otherwm)
 197                 eprint("dwm: another window manager is already running\n");
 198
 199         XSetErrorHandler(NULL);
 200         xerrorxlib = XSetErrorHandler(xerror);
 201
 202         /* init atoms */
 203         wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
 204         wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
 205         netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
 206         netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
 207         XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
 208                         PropModeReplace, (unsigned char *) netatom, NetLast);
 209
 210         /* init cursors */
 211         cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
 212         cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
 213         cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
 214
 215         grabkeys();
 216
 217         /* style */
 218         dc.bg = getcolor(BGCOLOR);
 219         dc.fg = getcolor(FGCOLOR);
 220         dc.border = getcolor(BORDERCOLOR);
 221         setfont(FONT);
 222
 223         sx = sy = 0;
 224         sw = DisplayWidth(dpy, screen);
 225         sh = DisplayHeight(dpy, screen);
 226         mw = (sw * MASTERW) / 100;
 227
 228         wa.override_redirect = 1;
 229         wa.background_pixmap = ParentRelative;
 230         wa.event_mask = ButtonPressMask | ExposureMask;
 231
 232         bx = by = 0;
 233         bw = sw;
 234         dc.h = bh = dc.font.height + 4;
 235         barwin = XCreateWindow(dpy, root, bx, by, bw, bh, 0, DefaultDepth(dpy, screen),
 236                         CopyFromParent, DefaultVisual(dpy, screen),
 237                         CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
 238         XDefineCursor(dpy, barwin, cursor[CurNormal]);
 239         XMapRaised(dpy, barwin);
 240
 241         dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
 242         dc.gc = XCreateGC(dpy, root, 0, 0);
 243         drawstatus();
 244
 245         issel = XQueryPointer(dpy, root, &w, &w, &i, &i, &i, &i, &mask);
 246
 247         wa.event_mask = SubstructureRedirectMask | EnterWindowMask | LeaveWindowMask;
 248         wa.cursor = cursor[CurNormal];
 249         XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);
 250
 251         strcpy(stext, "dwm-"VERSION);
 252         scan();
 253
 254         /* main event loop, reads status text from stdin as well */
 255         while(running) {
 256                 FD_ZERO(&rd);
 257                 if(readin)
 258                         FD_SET(STDIN_FILENO, &rd);
 259                 FD_SET(ConnectionNumber(dpy), &rd);
 260
 261                 i = select(ConnectionNumber(dpy) + 1, &rd, 0, 0, 0);
 262                 if(i == -1 && errno == EINTR)
 263                         continue;
 264                 if(i < 0)
 265                         eprint("select failed\n");
 266                 else if(i > 0) {
 267                         if(FD_ISSET(ConnectionNumber(dpy), &rd)) {
 268                                 while(XPending(dpy)) {
 269                                         XNextEvent(dpy, &ev);
 270                                         if(handler[ev.type])
 271                                                 (handler[ev.type])(&ev); /* call handler */
 272                                 }
 273                         }
 274                         if(readin && FD_ISSET(STDIN_FILENO, &rd)) {
 275                                 readin = NULL != fgets(stext, sizeof(stext), stdin);
 276                                 if(readin)
 277                                         stext[strlen(stext) - 1] = 0;
 278                                 else
 279                                         strcpy(stext, "broken pipe");
 280                                 drawstatus();
 281                         }
 282                 }
 283         }
 284
 285         cleanup();
 286         XCloseDisplay(dpy);
 287
 288         return 0;
 289 }