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 <X11/cursorfont.h>
  33 #include <X11/keysym.h>
  34 #include <X11/Xatom.h>
  35 #include <X11/Xproto.h>
  36 #include <X11/Xutil.h>
  37 #include <X11/extensions/shape.h>
  38 #include <X11/extensions/Xrandr.h>
  39
  40 #include "awesome.h"
  41 #include "event.h"
  42 #include "layout.h"
  43 #include "screen.h"
  44 #include "util.h"
  45 #include "statusbar.h"
  46 #include "uicb.h"
  47 #include "window.h"
  48 #include "awesome-client.h"
  49
  50 static int (*xerrorxlib) (Display *, XErrorEvent *);
  51 static Bool running = True;
  52
  53
  54 static inline void
  55 cleanup_buttons(Button *buttons)
  56 {
  57     Button *b, *bn;
  58
  59     for(b = buttons; b; b = bn)
  60     {
  61         bn = b->next;
  62         p_delete(&b->arg);
  63         p_delete(&b);
  64     }
  65 }
  66
  67 void
  68 cleanup_screen(awesome_config *awesomeconf)
  69 {
  70     int i;
  71     Key *k, *kn;
  72     Rule *r, *rn;
  73
  74     XftFontClose(awesomeconf->display, awesomeconf->font);
  75     XUngrabKey(awesomeconf->display, AnyKey, AnyModifier, RootWindow(awesomeconf->display, awesomeconf->phys_screen));
  76     XDestroyWindow(awesomeconf->display, awesomeconf->statusbar.window);
  77     XFreeCursor(awesomeconf->display, awesomeconf->cursor[CurNormal]);
  78     XFreeCursor(awesomeconf->display, awesomeconf->cursor[CurResize]);
  79     XFreeCursor(awesomeconf->display, awesomeconf->cursor[CurMove]);
  80
  81     for(i = 0; i < awesomeconf->ntags; i++)
  82         p_delete(&awesomeconf->tags[i].name);
  83     for(k = awesomeconf->keys; k; k = kn)
  84     {
  85         kn = k->next;
  86         p_delete(&k);
  87     }
  88
  89     cleanup_buttons(awesomeconf->buttons.tag);
  90     cleanup_buttons(awesomeconf->buttons.title);
  91     cleanup_buttons(awesomeconf->buttons.layout);
  92     cleanup_buttons(awesomeconf->buttons.root);
  93     cleanup_buttons(awesomeconf->buttons.client);
  94
  95     for(i = 0; i < awesomeconf->nlayouts; i++)
  96         p_delete(&awesomeconf->layouts[i].symbol);
  97     for(r = awesomeconf->rules; r; r = rn)
  98     {
  99         rn = r->next;
 100         p_delete(&r->prop);
 101         p_delete(&r->tags);
 102         p_delete(&r);
 103     }
 104
 105     p_delete(&awesomeconf->tags);
 106     p_delete(&awesomeconf->layouts);
 107     p_delete(&awesomeconf->configpath);
 108 }
 109
 110 /** Cleanup everything on quit
 111  * \param awesomeconf awesome config
 112  */
 113 static void
 114 cleanup(awesome_config *awesomeconf)
 115 {
 116     int screen;
 117
 118     while(*awesomeconf->clients)
 119     {
 120         client_unban(*awesomeconf->clients);
 121         client_unmanage(*awesomeconf->clients, NormalState, awesomeconf);
 122     }
 123
 124     for(screen = 0; screen < get_screen_count(awesomeconf->display); screen++)
 125         cleanup_screen(&awesomeconf[screen]);
 126
 127     XSetInputFocus(awesomeconf->display, PointerRoot, RevertToPointerRoot, CurrentTime);
 128     XSync(awesomeconf->display, False);
 129
 130     p_delete(&awesomeconf->clients);
 131     p_delete(&awesomeconf);
 132 }
 133
 134 /** Scan X to find windows to manage
 135  * \param screen Screen number
 136  * \param awesomeconf awesome config
 137  */
 138 static void
 139 scan(awesome_config *awesomeconf)
 140 {
 141     unsigned int i, num;
 142     int screen, real_screen;
 143     Window *wins = NULL, d1, d2;
 144     XWindowAttributes wa;
 145
 146     for(screen = 0; screen < ScreenCount(awesomeconf->display); screen++)
 147     {
 148         if(XQueryTree(awesomeconf->display, RootWindow(awesomeconf->display, screen), &d1, &d2, &wins, &num))
 149         {
 150             real_screen = screen;
 151             for(i = 0; i < num; i++)
 152             {
 153                 if(!XGetWindowAttributes(awesomeconf->display, wins[i], &wa)
 154                    || wa.override_redirect
 155                    || XGetTransientForHint(awesomeconf->display, wins[i], &d1))
 156                     continue;
 157                 if(wa.map_state == IsViewable || window_getstate(awesomeconf->display, wins[i]) == IconicState)
 158                 {
 159                     if(screen == 0)
 160                         real_screen = get_screen_bycoord(awesomeconf->display, wa.x, wa.y);
 161                     client_manage(wins[i], &wa, &awesomeconf[real_screen]);
 162                 }
 163             }
 164             /* now the transients */
 165             for(i = 0; i < num; i++)
 166             {
 167                 if(!XGetWindowAttributes(awesomeconf->display, wins[i], &wa))
 168                     continue;
 169                 if(XGetTransientForHint(awesomeconf->display, wins[i], &d1)
 170                    && (wa.map_state == IsViewable || window_getstate(awesomeconf->display, wins[i]) == IconicState))
 171                 {
 172                     if(screen == 0)
 173                         real_screen = get_screen_bycoord(awesomeconf->display, wa.x, wa.y);
 174                     client_manage(wins[i], &wa, &awesomeconf[real_screen]);
 175                 }
 176             }
 177         }
 178         if(wins)
 179             XFree(wins);
 180     }
 181 }
 182
 183 /** Setup everything before running
 184  * \param awesomeconf awesome config ref
 185  * \todo clean things...
 186  */
 187 static void
 188 setup(awesome_config *awesomeconf)
 189 {
 190     XSetWindowAttributes wa;
 191
 192     /* init cursors */
 193     awesomeconf->cursor[CurNormal] = XCreateFontCursor(awesomeconf->display, XC_left_ptr);
 194     awesomeconf->cursor[CurResize] = XCreateFontCursor(awesomeconf->display, XC_sizing);
 195     awesomeconf->cursor[CurMove] = XCreateFontCursor(awesomeconf->display, XC_fleur);
 196
 197     /* select for events */
 198     wa.event_mask = SubstructureRedirectMask | SubstructureNotifyMask
 199         | EnterWindowMask | LeaveWindowMask | StructureNotifyMask;
 200     wa.cursor = awesomeconf->cursor[CurNormal];
 201
 202     XChangeWindowAttributes(awesomeconf->display, RootWindow(awesomeconf->display, awesomeconf->phys_screen), CWEventMask | CWCursor, &wa);
 203
 204     XSelectInput(awesomeconf->display, RootWindow(awesomeconf->display, awesomeconf->phys_screen), wa.event_mask);
 205
 206     grabkeys(awesomeconf);
 207 }
 208
 209 void
 210 setup_screen(awesome_config *awesomeconf, const char *confpath)
 211 {
 212     parse_config(confpath, awesomeconf);
 213     setup(awesomeconf);
 214     initstatusbar(awesomeconf->display, awesomeconf->screen, &awesomeconf->statusbar,
 215             awesomeconf->cursor[CurNormal], awesomeconf->font,
 216             awesomeconf->layouts, awesomeconf->nlayouts);
 217 }
 218
 219 /** Startup Error handler to check if another window manager
 220  * is already running.
 221  * \param disp Display ref
 222  * \param ee Error event
 223  */
 224 static int __attribute__ ((noreturn))
 225 xerrorstart(Display * disp __attribute__ ((unused)), XErrorEvent * ee __attribute__ ((unused)))
 226 {
 227     eprint("awesome: another window manager is already running\n");
 228 }
 229
 230 /** Quit awesome
 231  * \param awesomeconf awesome config
 232  * \param arg nothing
 233  * \ingroup ui_callback
 234  */
 235 void
 236 uicb_quit(awesome_config *awesomeconf __attribute__((unused)),
 237           const char *arg __attribute__ ((unused)))
 238 {
 239     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 buf[1024];
 276     const char *confpath = NULL;
 277     int r, xfd, e_dummy, csfd;
 278     fd_set rd;
 279     XEvent ev;
 280     Display * dpy;
 281     awesome_config *awesomeconf;
 282     int shape_event, randr_event_base;
 283     int screen;
 284     enum { NetSupported, NetWMName, NetLast };   /* EWMH atoms */
 285     Atom netatom[NetLast];
 286     event_handler **handler;
 287     Client **clients;
 288     struct sockaddr_un *addr;
 289
 290     if(argc >= 2)
 291     {
 292         if(!a_strcmp("-v", argv[1]))
 293         {
 294             printf("awesome-" VERSION " © 2007 Julien Danjou\n");
 295             return EXIT_SUCCESS;
 296         }
 297         else if(!a_strcmp("-c", argv[1]))
 298         {
 299             if(a_strlen(argv[2]))
 300                 confpath = argv[2];
 301             else
 302                 eprint("awesome: -c require a file\n");
 303         }
 304         else
 305             eprint("usage: awesome [-v | -c configfile]\n");
 306     }
 307
 308     /* Tag won't be printed otherwised */
 309     setlocale(LC_CTYPE, "");
 310
 311     if(!(dpy = XOpenDisplay(NULL)))
 312         eprint("awesome: cannot open display\n");
 313
 314     xfd = ConnectionNumber(dpy);
 315
 316     XSetErrorHandler(xerrorstart);
 317     for(screen = 0; screen < ScreenCount(dpy); screen++)
 318         /* this causes an error if some other window manager is running */
 319         XSelectInput(dpy, RootWindow(dpy, screen), SubstructureRedirectMask);
 320
 321     /* need to XSync to validate errorhandler */
 322     XSync(dpy, False);
 323     XSetErrorHandler(NULL);
 324     xerrorxlib = XSetErrorHandler(xerror);
 325     XSync(dpy, False);
 326
 327     /* allocate stuff */
 328     awesomeconf = p_new(awesome_config, get_screen_count(dpy));
 329     clients = p_new(Client *, 1);
 330
 331     for(screen = 0; screen < get_screen_count(dpy); screen++)
 332     {
 333         /* store display */
 334         awesomeconf[screen].display = dpy;
 335
 336         /* set screen */
 337         awesomeconf[screen].screen = screen;
 338         setup_screen(&awesomeconf[screen], confpath);
 339         awesomeconf[screen].clients = clients;
 340         drawstatusbar(&awesomeconf[screen]);
 341     }
 342
 343     netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
 344     netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
 345
 346     /* do this only for real screen */
 347     for(screen = 0; screen < ScreenCount(dpy); screen++)
 348     {
 349         loadawesomeprops(&awesomeconf[screen]);
 350         XChangeProperty(dpy, RootWindow(dpy, screen), netatom[NetSupported],
 351                         XA_ATOM, 32, PropModeReplace, (unsigned char *) netatom, NetLast);
 352     }
 353
 354     handler = p_new(event_handler *, LASTEvent);
 355     handler[ButtonPress] = handle_event_buttonpress;
 356     handler[ConfigureRequest] = handle_event_configurerequest;
 357     handler[ConfigureNotify] = handle_event_configurenotify;
 358     handler[DestroyNotify] = handle_event_destroynotify;
 359     handler[EnterNotify] = handle_event_enternotify;
 360     handler[LeaveNotify] = handle_event_leavenotify;
 361     handler[Expose] = handle_event_expose;
 362     handler[KeyPress] = handle_event_keypress;
 363     handler[MappingNotify] = handle_event_mappingnotify;
 364     handler[MapRequest] = handle_event_maprequest;
 365     handler[PropertyNotify] = handle_event_propertynotify;
 366     handler[UnmapNotify] = handle_event_unmapnotify;
 367
 368     /* check for shape extension */
 369     if((awesomeconf[0].have_shape = XShapeQueryExtension(dpy, &shape_event, &e_dummy)))
 370     {
 371         p_realloc(&handler, shape_event + 1);
 372         handler[shape_event] = handle_event_shape;
 373     }
 374
 375     /* check for randr extension */
 376     if((awesomeconf[0].have_randr = XRRQueryExtension(dpy, &randr_event_base, &e_dummy)))
 377     {
 378         p_realloc(&handler, randr_event_base + RRScreenChangeNotify + 1);
 379         handler[randr_event_base + RRScreenChangeNotify] = handle_event_randr_screen_change_notify;
 380     }
 381
 382     for(screen = 0; screen < get_screen_count(dpy); screen++)
 383     {
 384         awesomeconf[screen].have_shape = awesomeconf[0].have_shape;
 385         awesomeconf[screen].have_randr = awesomeconf[0].have_randr;
 386     }
 387
 388     scan(awesomeconf);
 389
 390     XSync(dpy, False);
 391
 392     /* get socket fd */
 393     csfd = get_client_socket();
 394     addr = get_client_addr(getenv("DISPLAY"));
 395
 396     if(bind(csfd, (const struct sockaddr *) addr, SUN_LEN(addr)))
 397     {
 398         if(errno == EADDRINUSE)
 399         {
 400             if(unlink(addr->sun_path))
 401                 perror("error unlinking existing file");
 402             if(bind(csfd, (const struct sockaddr *) addr, SUN_LEN(addr)))
 403                 perror("error binding UNIX domain socket");
 404         }
 405         else
 406             perror("error binding UNIX domain socket");
 407     }
 408
 409     /* main event loop, also reads status text from socket */
 410     while(running)
 411     {
 412         FD_ZERO(&rd);
 413         if(csfd >= 0)
 414             FD_SET(csfd, &rd);
 415         FD_SET(xfd, &rd);
 416         if(select(MAX(xfd, csfd) + 1, &rd, NULL, NULL, NULL) == -1)
 417         {
 418             if(errno == EINTR)
 419                 continue;
 420             eprint("select failed\n");
 421         }
 422         if(csfd >= 0 && FD_ISSET(csfd, &rd))
 423             switch (r = recv(csfd, buf, sizeof(buf)-1, MSG_TRUNC))
 424             {
 425             case -1:
 426                 perror("awesome: error reading UNIX domain socket");
 427                 a_strncpy(awesomeconf[0].statustext, sizeof(awesomeconf[0].statustext),
 428                           strerror(errno), sizeof(awesomeconf[0].statustext) - 1);
 429                 awesomeconf[0].statustext[sizeof(awesomeconf[0].statustext) - 1] = '\0';
 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, awesomeconf);
 439             }
 440
 441         while(XPending(dpy))
 442         {
 443             XNextEvent(dpy, &ev);
 444             if(handler[ev.type])
 445                 handler[ev.type](&ev, awesomeconf);       /* 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(awesomeconf);
 456     XCloseDisplay(dpy);
 457
 458     return EXIT_SUCCESS;
 459 }
 460 // vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99