awesome.c

   1 /*
   2  * awesome.c - awesome main functions
   3  *
   4  * Copyright © 2007 Julien Danjou <julien@danjou.info>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19  *
  20  */
  21
  22 #include <errno.h>
  23 #include <locale.h>
  24 #include <stdio.h>
  25 #include <unistd.h>
  26 #include <sys/select.h>
  27 #include <X11/cursorfont.h>
  28 #include <X11/keysym.h>
  29 #include <X11/Xatom.h>
  30 #include <X11/Xproto.h>
  31 #include <X11/Xutil.h>
  32 #include <X11/extensions/shape.h>
  33 #include <X11/extensions/Xrandr.h>
  34
  35 #include "awesome.h"
  36 #include "event.h"
  37 #include "layout.h"
  38 #include "tag.h"
  39 #include "screen.h"
  40 #include "util.h"
  41 #include "statusbar.h"
  42
  43 Client *clients = NULL;
  44 Client *sel = NULL;
  45 Client *stack = NULL;
  46 DC *dc;
  47
  48 static int (*xerrorxlib) (Display *, XErrorEvent *);
  49 static Bool readin = True, running = True;
  50
  51 /** Cleanup everything on quit
  52  * \param disp Display ref
  53  * \param drawcontext Drawcontext ref
  54  * \param awesomeconf awesome config
  55  */
  56 static void
  57 cleanup(Display *disp, DC *drawcontext, awesome_config *awesomeconf)
  58 {
  59     int screen, i;
  60
  61     close(STDIN_FILENO);
  62
  63     while(stack)
  64     {
  65         unban(stack);
  66         unmanage(stack, drawcontext, NormalState, awesomeconf);
  67     }
  68
  69     for(screen = 0; screen < ScreenCount(disp); screen++)
  70     {
  71         if(drawcontext[screen].font.set)
  72             XFreeFontSet(disp, drawcontext[screen].font.set);
  73         else
  74             XFreeFont(disp, drawcontext[screen].font.xfont);
  75
  76             XUngrabKey(disp, AnyKey, AnyModifier, RootWindow(disp, screen));
  77
  78         XFreePixmap(disp, awesomeconf[screen].statusbar.drawable);
  79         XFreeGC(disp, drawcontext[screen].gc);
  80         XDestroyWindow(disp, awesomeconf[screen].statusbar.window);
  81         XFreeCursor(disp, drawcontext[screen].cursor[CurNormal]);
  82         XFreeCursor(disp, drawcontext[screen].cursor[CurResize]);
  83         XFreeCursor(disp, drawcontext[screen].cursor[CurMove]);
  84
  85         for(i = 0; i < awesomeconf[screen].ntags; i++)
  86             p_delete(&awesomeconf[screen].tags[i]);
  87         for(i = 0; i < awesomeconf[screen].nkeys; i++)
  88             p_delete(&awesomeconf[screen].keys[i].arg);
  89         for(i = 0; i < awesomeconf[screen].nlayouts; i++)
  90             p_delete(&awesomeconf[screen].layouts[i].symbol);
  91         for(i = 0; i < awesomeconf[screen].nrules; i++)
  92         {
  93             p_delete(&awesomeconf[screen].rules[i].prop);
  94             p_delete(&awesomeconf[screen].rules[i].tags);
  95         }
  96         p_delete(&awesomeconf[screen].tags);
  97         p_delete(&awesomeconf[screen].selected_tags);
  98         p_delete(&awesomeconf[screen].prev_selected_tags);
  99         p_delete(&awesomeconf[screen].tag_layouts);
 100         p_delete(&awesomeconf[screen].layouts);
 101         p_delete(&awesomeconf[screen].rules);
 102         p_delete(&awesomeconf[screen].keys);
 103     }
 104     XSetInputFocus(disp, PointerRoot, RevertToPointerRoot, CurrentTime);
 105     XSync(disp, False);
 106     p_delete(&awesomeconf);
 107     p_delete(&dc);
 108 }
 109
 110 /** Get a window state (WM_STATE)
 111  * \param disp Display ref
 112  * \param w Client window
 113  * \return state
 114  */
 115 static long
 116 getstate(Display *disp, Window w)
 117 {
 118     int format, status;
 119     long result = -1;
 120     unsigned char *p = NULL;
 121     unsigned long n, extra;
 122     Atom real;
 123     status = XGetWindowProperty(disp, w, XInternAtom(disp, "WM_STATE", False),
 124                                 0L, 2L, False, XInternAtom(disp, "WM_STATE", False),
 125                                 &real, &format, &n, &extra, (unsigned char **) &p);
 126     if(status != Success)
 127         return -1;
 128     if(n != 0)
 129         result = *p;
 130     XFree(p);
 131     return result;
 132 }
 133
 134 /** Scan X to find windows to manage
 135  * \param disp Display ref
 136  * \param screen Screen number
 137  * \param drawcontext Drawcontext ref
 138  * \param awesomeconf awesome config
 139  */
 140 static void
 141 scan(Display *disp, int screen, DC *drawcontext, awesome_config *awesomeconf)
 142 {
 143     unsigned int i, num;
 144     Window *wins, d1, d2;
 145     XWindowAttributes wa;
 146
 147     wins = NULL;
 148     if(XQueryTree(disp, RootWindow(disp, screen), &d1, &d2, &wins, &num))
 149     {
 150         for(i = 0; i < num; i++)
 151         {
 152             if(!XGetWindowAttributes(disp, wins[i], &wa)
 153                || wa.override_redirect
 154                || XGetTransientForHint(disp, wins[i], &d1))
 155                 continue;
 156                 if(wa.map_state == IsViewable || getstate(disp, wins[i]) == IconicState)
 157                     manage(disp, drawcontext, wins[i], &wa, awesomeconf);
 158         }
 159         /* now the transients */
 160         for(i = 0; i < num; i++)
 161         {
 162             if(!XGetWindowAttributes(disp, wins[i], &wa))
 163                 continue;
 164             if(XGetTransientForHint(disp, wins[i], &d1)
 165                && (wa.map_state == IsViewable || getstate(disp, wins[i]) == IconicState))
 166                 manage(disp, drawcontext, wins[i], &wa, awesomeconf);
 167         }
 168     }
 169     if(wins)
 170         XFree(wins);
 171 }
 172
 173 /** Setup everything before running
 174  * \param disp Display ref
 175  * \param screen Screen number
 176  * \param awesomeconf awesome config ref
 177  * \todo clean things...
 178  */
 179 static void
 180 setup(Display *disp, int screen, DC *drawcontext, awesome_config *awesomeconf)
 181 {
 182     XSetWindowAttributes wa;
 183
 184     /* init cursors */
 185     drawcontext->cursor[CurNormal] = XCreateFontCursor(disp, XC_left_ptr);
 186     drawcontext->cursor[CurResize] = XCreateFontCursor(disp, XC_sizing);
 187     drawcontext->cursor[CurMove] = XCreateFontCursor(disp, XC_fleur);
 188
 189     /* select for events */
 190     wa.event_mask = SubstructureRedirectMask | SubstructureNotifyMask
 191         | EnterWindowMask | LeaveWindowMask | StructureNotifyMask;
 192     wa.cursor = drawcontext->cursor[CurNormal];
 193
 194     XChangeWindowAttributes(disp, RootWindow(disp, screen), CWEventMask | CWCursor, &wa);
 195
 196     XSelectInput(disp, RootWindow(disp, screen), wa.event_mask);
 197
 198     grabkeys(disp, screen, awesomeconf);
 199
 200     compileregs(awesomeconf->rules, awesomeconf->nrules);
 201
 202     /* bar */
 203     drawcontext->h = awesomeconf->statusbar.height = drawcontext->font.height + 2;
 204     initstatusbar(disp, screen, drawcontext, &awesomeconf->statusbar);
 205     drawcontext->gc = XCreateGC(disp, RootWindow(disp, screen), 0, 0);
 206     XSetLineAttributes(disp, drawcontext->gc, 1, LineSolid, CapButt, JoinMiter);
 207
 208     if(!drawcontext->font.set)
 209         XSetFont(disp, drawcontext->gc, drawcontext->font.xfont->fid);
 210
 211     loadawesomeprops(disp, awesomeconf);
 212 }
 213
 214 /** Startup Error handler to check if another window manager
 215  * is already running.
 216  * \param disp Display ref
 217  * \param ee Error event
 218  */
 219 static int __attribute__ ((noreturn))
 220 xerrorstart(Display * disp __attribute__ ((unused)), XErrorEvent * ee __attribute__ ((unused)))
 221 {
 222     eprint("awesome: another window manager is already running\n");
 223 }
 224
 225 /** Quit awesome
 226  * \param disp Display ref
 227  * \param screen Screen number
 228  * \param drawcontext Drawcontext ref
 229  * \param awesomeconf awesome config
 230  * \param arg nothing
 231  * \ingroup ui_callback
 232  */
 233 void
 234 uicb_quit(Display *disp __attribute__ ((unused)),
 235           DC *drawcontext __attribute__ ((unused)),
 236           awesome_config *awesomeconf __attribute__((unused)),
 237           const char *arg __attribute__ ((unused)))
 238 {
 239     readin = running = False;
 240 }
 241
 242 /* There's no way to check accesses to destroyed windows, thus those cases are
 243  * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
 244  * default error handler, which may call exit.
 245  */
 246 int
 247 xerror(Display * edpy, XErrorEvent * ee)
 248 {
 249     if(ee->error_code == BadWindow
 250        || (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
 251        || (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
 252        || (ee->request_code == X_PolyFillRectangle
 253            && ee->error_code == BadDrawable)
 254        || (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
 255        || (ee->request_code == X_ConfigureWindow
 256            && ee->error_code == BadMatch) || (ee->request_code == X_GrabKey
 257                                               && ee->error_code == BadAccess)
 258        || (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
 259         return 0;
 260     fprintf(stderr, "awesome: fatal error: request code=%d, error code=%d\n",
 261             ee->request_code, ee->error_code);
 262
 263     return xerrorxlib(edpy, ee);        /* may call exit */
 264 }
 265
 266 /** Hello, this is main
 267  * \param argc who knows
 268  * \param argv who knows
 269  * \return EXIT_SUCCESS I hope
 270  */
 271 typedef void event_handler (XEvent *, awesome_config *);
 272 int
 273 main(int argc, char *argv[])
 274 {
 275     char *p;
 276     int r, xfd, e_dummy;
 277     fd_set rd;
 278     XEvent ev;
 279     Display * dpy;
 280     awesome_config *awesomeconf;
 281     int shape_event, randr_event_base;
 282     int screen;
 283     enum { NetSupported, NetWMName, NetLast };   /* EWMH atoms */
 284     Atom netatom[NetLast];
 285     event_handler **handler;
 286
 287     if(argc == 2 && !strcmp("-v", argv[1]))
 288     {
 289         printf("awesome-" VERSION " © 2007 Julien Danjou\n");
 290         return EXIT_SUCCESS;
 291     }
 292     else if(argc != 1)
 293         eprint("usage: awesome [-v]\n");
 294
 295     /* Tag won't be printed otherwised */
 296     setlocale(LC_CTYPE, "");
 297
 298     if(!(dpy = XOpenDisplay(NULL)))
 299         eprint("awesome: cannot open display\n");
 300
 301     xfd = ConnectionNumber(dpy);
 302
 303     XSetErrorHandler(xerrorstart);
 304     for(screen = 0; screen < ScreenCount(dpy); screen++)
 305         /* this causes an error if some other window manager is running */
 306         XSelectInput(dpy, RootWindow(dpy, screen), SubstructureRedirectMask);
 307
 308     /* need to XSync to validate errorhandler */
 309     XSync(dpy, False);
 310     XSetErrorHandler(NULL);
 311     xerrorxlib = XSetErrorHandler(xerror);
 312     XSync(dpy, False);
 313
 314     netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
 315     netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
 316
 317     /* allocate stuff */
 318     dc = p_new(DC, ScreenCount(dpy));
 319     awesomeconf = p_new(awesome_config, ScreenCount(dpy));
 320
 321     for(screen = 0; screen < ScreenCount(dpy); screen++)
 322     {
 323         parse_config(dpy, screen, &dc[screen], &awesomeconf[screen]);
 324         setup(dpy, screen, &dc[screen], &awesomeconf[screen]);
 325         XChangeProperty(dpy, RootWindow(dpy, screen), netatom[NetSupported],
 326                         XA_ATOM, 32, PropModeReplace, (unsigned char *) netatom, NetLast);
 327         drawstatusbar(dpy, screen, &dc[screen], &awesomeconf[screen]);
 328     }
 329
 330     handler = p_new(event_handler *, LASTEvent);
 331     handler[ButtonPress] = handle_event_buttonpress;
 332     handler[ConfigureRequest] = handle_event_configurerequest;
 333     handler[ConfigureNotify] = handle_event_configurenotify;
 334     handler[DestroyNotify] = handle_event_destroynotify;
 335     handler[EnterNotify] = handle_event_enternotify;
 336     handler[LeaveNotify] = handle_event_leavenotify;
 337     handler[Expose] = handle_event_expose;
 338     handler[KeyPress] = handle_event_keypress;
 339     handler[MappingNotify] = handle_event_mappingnotify;
 340     handler[MapRequest] = handle_event_maprequest;
 341     handler[PropertyNotify] = handle_event_propertynotify;
 342     handler[UnmapNotify] = handle_event_unmapnotify;
 343
 344     /* check for shape extension */
 345     if((awesomeconf[0].have_shape = XShapeQueryExtension(dpy, &shape_event, &e_dummy)))
 346     {
 347         p_realloc(&handler, shape_event + 1);
 348         handler[shape_event] = handle_event_shape;
 349     }
 350
 351     /* check for randr extension */
 352     if((awesomeconf[0].have_randr = XRRQueryExtension(dpy, &randr_event_base, &e_dummy)))
 353     {
 354         p_realloc(&handler, randr_event_base + RRScreenChangeNotify + 1);
 355         handler[randr_event_base + RRScreenChangeNotify] = handle_event_randr_screen_change_notify;
 356     }
 357
 358     for(screen = 0; screen < ScreenCount(dpy); screen++)
 359     {
 360         awesomeconf[screen].have_shape = awesomeconf[0].have_shape;
 361         awesomeconf[screen].have_randr = awesomeconf[0].have_randr;
 362         scan(dpy, screen, &dc[screen], &awesomeconf[screen]);
 363     }
 364
 365     XSync(dpy, False);
 366
 367     /* main event loop, also reads status text from stdin */
 368     while(running)
 369     {
 370         FD_ZERO(&rd);
 371         if(readin)
 372             FD_SET(STDIN_FILENO, &rd);
 373         FD_SET(xfd, &rd);
 374         if(select(xfd + 1, &rd, NULL, NULL, NULL) == -1)
 375         {
 376             if(errno == EINTR)
 377                 continue;
 378             eprint("select failed\n");
 379         }
 380         if(FD_ISSET(STDIN_FILENO, &rd))
 381         {
 382             switch (r = read(STDIN_FILENO, awesomeconf[0].statustext, sizeof(awesomeconf[0].statustext) - 1))
 383             {
 384             case -1:
 385                 strncpy(awesomeconf[0].statustext, strerror(errno), sizeof(awesomeconf[0].statustext) - 1);
 386                 awesomeconf[0].statustext[sizeof(awesomeconf[0].statustext) - 1] = '\0';
 387                 readin = False;
 388                 break;
 389             case 0:
 390                 strncpy(awesomeconf[0].statustext, "EOF", 4);
 391                 readin = False;
 392                 break;
 393             default:
 394                 for(awesomeconf[0].statustext[r] = '\0', p = awesomeconf[0].statustext + a_strlen(awesomeconf[0].statustext) - 1;
 395                     p >= awesomeconf[0].statustext && *p == '\n'; *p-- = '\0');
 396                 for(; p >= awesomeconf[0].statustext && *p != '\n'; --p);
 397                 if(p > awesomeconf[0].statustext)
 398                     strncpy(awesomeconf[0].statustext, p + 1, sizeof(awesomeconf[0].statustext));
 399             }
 400             drawstatusbar(dpy, 0, &dc[0], &awesomeconf[0]);
 401         }
 402
 403         while(XPending(dpy))
 404         {
 405             XNextEvent(dpy, &ev);
 406             if(handler[ev.type])
 407                 handler[ev.type](&ev, awesomeconf);       /* call handler */
 408         }
 409     }
 410     cleanup(dpy, dc, awesomeconf);
 411     XCloseDisplay(dpy);
 412
 413     return EXIT_SUCCESS;
 414 }