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