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 <sys/types.h>
  28 #include <sys/stat.h>
  29 #include <sys/socket.h>
  30 #include <sys/un.h>
  31 #include <fcntl.h>
  32 #include <signal.h>
  33 #include <X11/cursorfont.h>
  34 #include <X11/keysym.h>
  35 #include <X11/Xatom.h>
  36 #include <X11/Xproto.h>
  37 #include <X11/Xutil.h>
  38 #include <X11/extensions/shape.h>
  39 #include <X11/extensions/Xrandr.h>
  40
  41 #include "awesome.h"
  42 #include "event.h"
  43 #include "layout.h"
  44 #include "screen.h"
  45 #include "util.h"
  46 #include "statusbar.h"
  47 #include "uicb.h"
  48 #include "window.h"
  49 #include "client.h"
  50 #include "focus.h"
  51 #include "ewmh.h"
  52 #include "awesome-client.h"
  53
  54 static int (*xerrorxlib) (Display *, XErrorEvent *);
  55 static Bool running = True;
  56
  57 AwesomeConf globalconf;
  58
  59 static inline void
  60 cleanup_buttons(Button *buttons)
  61 {
  62     Button *b, *bn;
  63
  64     for(b = buttons; b; b = bn)
  65     {
  66         bn = b->next;
  67         p_delete(&b->arg);
  68         p_delete(&b);
  69     }
  70 }
  71
  72 static void
  73 cleanup_screen(int screen)
  74 {
  75     Layout *l, *ln;
  76     Tag *t, *tn;
  77
  78     XftFontClose(globalconf.display, globalconf.screens[screen].font);
  79     XUngrabKey(globalconf.display, AnyKey, AnyModifier, RootWindow(globalconf.display, get_phys_screen(screen)));
  80     XDestroyWindow(globalconf.display, globalconf.screens[screen].statusbar->window);
  81
  82     for(t = globalconf.screens[screen].tags; t; t = tn)
  83     {
  84         tn = t->next;
  85         p_delete(&t->name);
  86         p_delete(&t);
  87     }
  88
  89     for(l = globalconf.screens[screen].layouts; l; l = ln)
  90     {
  91         ln = l->next;
  92         p_delete(&l->image);
  93         p_delete(&l);
  94     }
  95 }
  96
  97 /** Cleanup everything on quit
  98  * \param awesomeconf awesome config
  99  */
 100 static void
 101 cleanup()
 102 {
 103     int screen;
 104     Rule *r, *rn;
 105     Key *k, *kn;
 106
 107     while(globalconf.clients)
 108     {
 109         client_unban(globalconf.clients);
 110         client_unmanage(globalconf.clients, NormalState);
 111     }
 112
 113     XFreeCursor(globalconf.display, globalconf.cursor[CurNormal]);
 114     XFreeCursor(globalconf.display, globalconf.cursor[CurResize]);
 115     XFreeCursor(globalconf.display, globalconf.cursor[CurMove]);
 116
 117     for(r = globalconf.rules; r; r = rn)
 118     {
 119         rn = r->next;
 120         p_delete(&r->prop);
 121         p_delete(&r->tags);
 122         p_delete(&r->propregex);
 123         p_delete(&r->tagregex);
 124         p_delete(&r);
 125     }
 126
 127     for(k = globalconf.keys; k; k = kn)
 128     {
 129         kn = k->next;
 130         p_delete(&k->arg);
 131         p_delete(&k);
 132     }
 133
 134     cleanup_buttons(globalconf.buttons.root);
 135     cleanup_buttons(globalconf.buttons.client);
 136
 137     p_delete(&globalconf.configpath);
 138
 139     for(screen = 0; screen < get_screen_count(); screen++)
 140         cleanup_screen(screen);
 141
 142     XSetInputFocus(globalconf.display, PointerRoot, RevertToPointerRoot, CurrentTime);
 143     XSync(globalconf.display, False);
 144
 145     p_delete(&globalconf.clients);
 146 }
 147
 148 /** Scan X to find windows to manage
 149  */
 150 static void
 151 scan()
 152 {
 153     unsigned int i, num;
 154     int screen, real_screen;
 155     Window *wins = NULL, d1, d2;
 156     XWindowAttributes wa;
 157
 158     for(screen = 0; screen < ScreenCount(globalconf.display); screen++)
 159     {
 160         if(XQueryTree(globalconf.display, RootWindow(globalconf.display, screen), &d1, &d2, &wins, &num))
 161         {
 162             real_screen = screen;
 163             for(i = 0; i < num; i++)
 164             {
 165                 if(!XGetWindowAttributes(globalconf.display, wins[i], &wa)
 166                    || wa.override_redirect
 167                    || XGetTransientForHint(globalconf.display, wins[i], &d1))
 168                     continue;
 169                 if(wa.map_state == IsViewable || window_getstate(wins[i]) == IconicState)
 170                 {
 171                     if(screen == 0)
 172                         real_screen = get_screen_bycoord(wa.x, wa.y);
 173                     client_manage(wins[i], &wa, real_screen);
 174                 }
 175             }
 176             /* now the transients */
 177             for(i = 0; i < num; i++)
 178             {
 179                 if(!XGetWindowAttributes(globalconf.display, wins[i], &wa))
 180                     continue;
 181                 if(XGetTransientForHint(globalconf.display, wins[i], &d1)
 182                    && (wa.map_state == IsViewable || window_getstate(wins[i]) == IconicState))
 183                 {
 184                     if(screen == 0)
 185                         real_screen = get_screen_bycoord(wa.x, wa.y);
 186                     client_manage(wins[i], &wa, real_screen);
 187                 }
 188             }
 189         }
 190         if(wins)
 191             XFree(wins);
 192     }
 193 }
 194
 195 /** Setup everything before running
 196  * \param screen Screen number
 197  * \todo clean things...
 198  */
 199 static void
 200 setup(int screen)
 201 {
 202     XSetWindowAttributes wa;
 203
 204     /* init cursors */
 205     globalconf.cursor[CurNormal] = XCreateFontCursor(globalconf.display, XC_left_ptr);
 206     globalconf.cursor[CurResize] = XCreateFontCursor(globalconf.display, XC_sizing);
 207     globalconf.cursor[CurMove] = XCreateFontCursor(globalconf.display, XC_fleur);
 208
 209     /* select for events */
 210     wa.event_mask = SubstructureRedirectMask | SubstructureNotifyMask
 211         | EnterWindowMask | LeaveWindowMask | StructureNotifyMask;
 212     wa.cursor = globalconf.cursor[CurNormal];
 213
 214     XChangeWindowAttributes(globalconf.display,
 215                             RootWindow(globalconf.display, get_phys_screen(screen)),
 216                             CWEventMask | CWCursor, &wa);
 217
 218     XSelectInput(globalconf.display,
 219                  RootWindow(globalconf.display, get_phys_screen(screen)),
 220                  wa.event_mask);
 221
 222     grabkeys(get_phys_screen(screen));
 223 }
 224
 225 /** Startup Error handler to check if another window manager
 226  * is already running.
 227  * \param disp Display
 228  * \param ee Error event
 229  */
 230 static int __attribute__ ((noreturn))
 231 xerrorstart(Display * disp __attribute__ ((unused)),
 232             XErrorEvent * ee __attribute__ ((unused)))
 233 {
 234     eprint("another window manager is already running\n");
 235 }
 236
 237 /** Quit awesome
 238  * \param screen Screen ID
 239  * \param arg nothing
 240  * \ingroup ui_callback
 241  */
 242 void
 243 uicb_quit(int screen __attribute__ ((unused)), char *arg __attribute__ ((unused)))
 244 {
 245     running = False;
 246 }
 247
 248 static void
 249 exit_on_signal(int sig __attribute__ ((unused)))
 250 {
 251     running = False;
 252 }
 253
 254 /* There's no way to check accesses to destroyed windows, thus those cases are
 255  * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
 256  * default error handler, which may call exit.
 257  */
 258 int
 259 xerror(Display * edpy, XErrorEvent * ee)
 260 {
 261     if(ee->error_code == BadWindow
 262        || (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
 263        || (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
 264        || (ee->request_code == X_PolyFillRectangle
 265            && ee->error_code == BadDrawable)
 266        || (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
 267        || (ee->request_code == X_ConfigureWindow
 268            && ee->error_code == BadMatch) || (ee->request_code == X_GrabKey
 269                                               && ee->error_code == BadAccess)
 270        || (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
 271         return 0;
 272     warn("fatal error: request code=%d, error code=%d\n", ee->request_code, ee->error_code);
 273     return xerrorxlib(edpy, ee);        /* may call exit */
 274 }
 275
 276 /** Hello, this is main
 277  * \param argc who knows
 278  * \param argv who knows
 279  * \return EXIT_SUCCESS I hope
 280  */
 281 typedef void event_handler (XEvent *);
 282 int
 283 main(int argc, char *argv[])
 284 {
 285     char buf[1024];
 286     const char *confpath = NULL;
 287     int r, xfd, e_dummy, csfd;
 288     fd_set rd;
 289     XEvent ev;
 290     Display * dpy;
 291     int shape_event, randr_event_base;
 292     int screen;
 293     event_handler **handler;
 294     struct sockaddr_un *addr;
 295     Statusbar *statusbar;
 296
 297     if(argc >= 2)
 298     {
 299         if(!a_strcmp("-v", argv[1]) || !a_strcmp("--version", argv[1]))
 300         {
 301             printf("awesome-" VERSION " (" RELEASE ")\n");
 302             return EXIT_SUCCESS;
 303         }
 304         else if(!a_strcmp("-c", argv[1]))
 305         {
 306             if(a_strlen(argv[2]))
 307                 confpath = argv[2];
 308             else
 309                 eprint("-c require a file\n");
 310         }
 311         else
 312             eprint("options: [-v | -c configfile]\n");
 313     }
 314
 315     /* Tag won't be printed otherwised */
 316     setlocale(LC_CTYPE, "");
 317
 318     if(!(dpy = XOpenDisplay(NULL)))
 319         eprint("cannot open display\n");
 320
 321     xfd = ConnectionNumber(dpy);
 322
 323     XSetErrorHandler(xerrorstart);
 324     for(screen = 0; screen < ScreenCount(dpy); screen++)
 325         /* this causes an error if some other window manager is running */
 326         XSelectInput(dpy, RootWindow(dpy, screen), SubstructureRedirectMask);
 327
 328     /* need to XSync to validate errorhandler */
 329     XSync(dpy, False);
 330     XSetErrorHandler(NULL);
 331     xerrorxlib = XSetErrorHandler(xerror);
 332     XSync(dpy, False);
 333     globalconf.display = dpy;
 334
 335     ewmh_init_atoms();
 336
 337     globalconf.screens = p_new(VirtScreen, get_screen_count());
 338     focus_add_client(NULL);
 339     /* store display */
 340     config_parse(confpath);
 341
 342     for(screen = 0; screen < get_screen_count(); screen++)
 343     {
 344         /* set screen */
 345         setup(screen);
 346         for(statusbar = globalconf.screens[screen].statusbar; statusbar; statusbar = statusbar->next)
 347             statusbar_init(statusbar, screen);
 348     }
 349
 350     /* do this only for real screen */
 351     for(screen = 0; screen < ScreenCount(dpy); screen++)
 352     {
 353         loadawesomeprops(screen);
 354         ewmh_set_supported_hints(screen);
 355     }
 356
 357     handler = p_new(event_handler *, LASTEvent);
 358     handler[ButtonPress] = handle_event_buttonpress;
 359     handler[ConfigureRequest] = handle_event_configurerequest;
 360     handler[ConfigureNotify] = handle_event_configurenotify;
 361     handler[DestroyNotify] = handle_event_destroynotify;
 362     handler[EnterNotify] = handle_event_enternotify;
 363     handler[LeaveNotify] = handle_event_leavenotify;
 364     handler[Expose] = handle_event_expose;
 365     handler[KeyPress] = handle_event_keypress;
 366     handler[MappingNotify] = handle_event_mappingnotify;
 367     handler[MapRequest] = handle_event_maprequest;
 368     handler[PropertyNotify] = handle_event_propertynotify;
 369     handler[UnmapNotify] = handle_event_unmapnotify;
 370     handler[ClientMessage] = handle_event_clientmessage;
 371
 372     /* check for shape extension */
 373     if((globalconf.have_shape = XShapeQueryExtension(dpy, &shape_event, &e_dummy)))
 374     {
 375         p_realloc(&handler, shape_event + 1);
 376         handler[shape_event] = handle_event_shape;
 377     }
 378
 379     /* check for randr extension */
 380     if((globalconf.have_randr = XRRQueryExtension(dpy, &randr_event_base, &e_dummy)))
 381     {
 382         p_realloc(&handler, randr_event_base + RRScreenChangeNotify + 1);
 383         handler[randr_event_base + RRScreenChangeNotify] = handle_event_randr_screen_change_notify;
 384     }
 385
 386     scan();
 387
 388     XSync(dpy, False);
 389
 390     /* get socket fd */
 391     csfd = get_client_socket();
 392     addr = get_client_addr(getenv("DISPLAY"));
 393
 394     if(bind(csfd, (const struct sockaddr *) addr, SUN_LEN(addr)))
 395     {
 396         if(errno == EADDRINUSE)
 397         {
 398             if(unlink(addr->sun_path))
 399                 perror("error unlinking existing file");
 400             if(bind(csfd, (const struct sockaddr *) addr, SUN_LEN(addr)))
 401                 perror("error binding UNIX domain socket");
 402         }
 403         else
 404             perror("error binding UNIX domain socket");
 405     }
 406
 407     /* register function for signals */
 408     signal(SIGINT, &exit_on_signal);
 409     signal(SIGTERM, &exit_on_signal);
 410     signal(SIGHUP, &exit_on_signal);
 411
 412     /* main event loop, also reads status text from socket */
 413     while(running)
 414     {
 415         FD_ZERO(&rd);
 416         if(csfd >= 0)
 417             FD_SET(csfd, &rd);
 418         FD_SET(xfd, &rd);
 419         if(select(MAX(xfd, csfd) + 1, &rd, NULL, NULL, NULL) == -1)
 420         {
 421             if(errno == EINTR)
 422                 continue;
 423             eprint("select failed\n");
 424         }
 425         if(csfd >= 0 && FD_ISSET(csfd, &rd))
 426             switch (r = recv(csfd, buf, sizeof(buf)-1, MSG_TRUNC))
 427             {
 428             case -1:
 429                 perror("awesome: error reading UNIX domain socket");
 430                 csfd = -1;
 431                 break;
 432             case 0:
 433                 break;
 434             default:
 435                 if(r >= ssizeof(buf))
 436                     break;
 437                 buf[r] = '\0';
 438                 parse_control(buf);
 439             }
 440
 441         while(XPending(dpy))
 442         {
 443             XNextEvent(dpy, &ev);
 444             if(handler[ev.type])
 445                 handler[ev.type](&ev);       /* call handler */
 446         }
 447     }
 448
 449     if(csfd > 0 && close(csfd))
 450         perror("error closing UNIX domain socket");
 451     if(unlink(addr->sun_path))
 452         perror("error unlinking UNIX domain socket");
 453     p_delete(&addr);
 454
 455     cleanup();
 456     XCloseDisplay(dpy);
 457
 458     return EXIT_SUCCESS;
 459 }
 460 // vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80