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/Xatom.h>
  15 #include <X11/Xproto.h>
  16
  17 /* static */
  18
  19 static int (*xerrorxlib)(Display *, XErrorEvent *);
  20 static Bool otherwm;
  21
  22 static void
  23 cleanup()
  24 {
  25         ungrabkeys();
  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 Bool *seltag;
  88 int screen, sx, sy, sw, sh, bx, by, bw, bh, mw;
  89 unsigned int ntags;
  90 Atom wmatom[WMLast], netatom[NetLast];
  91 Bool running = True;
  92 Bool issel = True;
  93 Client *clients = NULL;
  94 Client *sel = NULL;
  95 Cursor cursor[CurLast];
  96 Display *dpy;
  97 DC dc = {0};
  98 Window root, barwin;
  99
 100 int
 101 getproto(Window w)
 102 {
 103         int protos = 0;
 104         int i;
 105         long res;
 106         Atom *protocols;
 107
 108         res = win_property(w, wmatom[WMProtocols], XA_ATOM, 20L,
 109                         ((unsigned char **)&protocols));
 110         if(res <= 0) {
 111                 return protos;
 112         }
 113         for(i = 0; i < res; i++) {
 114                 if(protocols[i] == wmatom[WMDelete])
 115                         protos |= PROTODELWIN;
 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 && ee->error_code == BadMatch)
 152         || (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
 153         || (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
 154         || (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
 155         || (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
 156         || (ee->request_code == X_GrabKey && ee->error_code == BadAccess))
 157                 return 0;
 158         fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
 159                 ee->request_code, ee->error_code);
 160         return xerrorxlib(dpy, ee); /* may call exit() */
 161 }
 162
 163 int
 164 main(int argc, char *argv[])
 165 {
 166         int i, xfd;
 167         unsigned int mask;
 168         fd_set rd;
 169         Bool readin = True;
 170         Window w;
 171         XEvent ev;
 172         XSetWindowAttributes wa;
 173
 174         if(argc == 2 && !strncmp("-v", argv[1], 3)) {
 175                 fputs("dwm-"VERSION", (C)opyright MMVI Anselm R. Garbe\n", stdout);
 176                 exit(EXIT_SUCCESS);
 177         }
 178         else if(argc != 1)
 179                 eprint("usage: dwm [-v]\n");
 180
 181         dpy = XOpenDisplay(0);
 182         if(!dpy)
 183                 eprint("dwm: cannot open display\n");
 184
 185         xfd = ConnectionNumber(dpy);
 186         screen = DefaultScreen(dpy);
 187         root = RootWindow(dpy, screen);
 188
 189         otherwm = False;
 190         XSetErrorHandler(xerrorstart);
 191         /* this causes an error if some other window manager is running */
 192         XSelectInput(dpy, root, SubstructureRedirectMask);
 193         XSync(dpy, False);
 194
 195         if(otherwm)
 196                 eprint("dwm: another window manager is already running\n");
 197
 198         XSetErrorHandler(NULL);
 199         xerrorxlib = XSetErrorHandler(xerror);
 200
 201         /* init atoms */
 202         wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
 203         wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
 204         netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
 205         netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
 206         XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
 207                         PropModeReplace, (unsigned char *) netatom, NetLast);
 208
 209         /* init cursors */
 210         cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
 211         cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
 212         cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
 213
 214         grabkeys();
 215         initrregs();
 216
 217         for(ntags = 0; tags[ntags]; ntags++);
 218         seltag = emallocz(sizeof(Bool) * ntags);
 219         seltag[DEFTAG] = True;
 220
 221         /* style */
 222         dc.bg = getcolor(BGCOLOR);
 223         dc.fg = getcolor(FGCOLOR);
 224         dc.border = getcolor(BORDERCOLOR);
 225         setfont(FONT);
 226
 227         sx = sy = 0;
 228         sw = DisplayWidth(dpy, screen);
 229         sh = DisplayHeight(dpy, screen);
 230         mw = (sw * MASTERW) / 100;
 231
 232         wa.override_redirect = 1;
 233         wa.background_pixmap = ParentRelative;
 234         wa.event_mask = ButtonPressMask | ExposureMask;
 235
 236         bx = by = 0;
 237         bw = sw;
 238         dc.h = bh = dc.font.height + 4;
 239         barwin = XCreateWindow(dpy, root, bx, by, bw, bh, 0, DefaultDepth(dpy, screen),
 240                         CopyFromParent, DefaultVisual(dpy, screen),
 241                         CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
 242         XDefineCursor(dpy, barwin, cursor[CurNormal]);
 243         XMapRaised(dpy, barwin);
 244
 245         dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
 246         dc.gc = XCreateGC(dpy, root, 0, 0);
 247
 248         strcpy(stext, "dwm-"VERSION);
 249         drawstatus();
 250
 251         issel = XQueryPointer(dpy, root, &w, &w, &i, &i, &i, &i, &mask);
 252
 253         wa.event_mask = SubstructureRedirectMask | EnterWindowMask | LeaveWindowMask;
 254         wa.cursor = cursor[CurNormal];
 255         XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);
 256
 257         scan();
 258
 259         /* main event loop, also reads status text from stdin */
 260         XSync(dpy, False);
 261         while(running) {
 262                 FD_ZERO(&rd);
 263                 if(readin)
 264                         FD_SET(STDIN_FILENO, &rd);
 265                 FD_SET(xfd, &rd);
 266
 267                 i = select(xfd + 1, &rd, NULL, NULL, NULL);
 268                 if(i == -1 && errno == EINTR)
 269                         continue;
 270                 if(i < 0)
 271                         eprint("select failed\n");
 272                 else if(i > 0) {
 273                         if(FD_ISSET(xfd, &rd)) {
 274                                 while(XPending(dpy)) {
 275                                         XNextEvent(dpy, &ev);
 276                                         if(handler[ev.type])
 277                                                 (handler[ev.type])(&ev); /* call handler */
 278                                 }
 279                         }
 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         }
 290
 291         cleanup();
 292         XCloseDisplay(dpy);
 293
 294         return 0;
 295 }