awesome.c

   1 /*
   2  * awesome.c - awesome main functions
   3  *
   4  * Copyright © 2007-2008 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 #define _GNU_SOURCE
  23 #include <getopt.h>
  24
  25 #include <errno.h>
  26 #include <locale.h>
  27 #include <stdio.h>
  28 #include <unistd.h>
  29 #include <sys/select.h>
  30 #include <sys/types.h>
  31 #include <sys/stat.h>
  32 #include <sys/socket.h>
  33 #include <sys/un.h>
  34 #include <fcntl.h>
  35 #include <signal.h>
  36 #include <X11/cursorfont.h>
  37 #include <X11/keysym.h>
  38 #include <X11/Xatom.h>
  39 #include <X11/Xproto.h>
  40 #include <X11/Xutil.h>
  41 #include <X11/extensions/shape.h>
  42 #include <X11/extensions/Xrandr.h>
  43
  44 #include "config.h"
  45 #include "awesome.h"
  46 #include "event.h"
  47 #include "layout.h"
  48 #include "screen.h"
  49 #include "statusbar.h"
  50 #include "uicb.h"
  51 #include "window.h"
  52 #include "client.h"
  53 #include "focus.h"
  54 #include "ewmh.h"
  55 #include "common/awclient.h"
  56 #include "common/util.h"
  57 #include "common/awesome-version.h"
  58 #include "common/configopts.h"
  59
  60 static int (*xerrorxlib) (Display *, XErrorEvent *);
  61 static Bool running = True;
  62
  63 AwesomeConf globalconf;
  64
  65 /** Scan X to find windows to manage
  66  */
  67 static void
  68 scan()
  69 {
  70     unsigned int i, num;
  71     int screen, real_screen;
  72     Window *wins = NULL, d1, d2;
  73     XWindowAttributes wa;
  74
  75     for(screen = 0; screen < ScreenCount(globalconf.display); screen++)
  76     {
  77         if(XQueryTree(globalconf.display, RootWindow(globalconf.display, screen), &d1, &d2, &wins, &num))
  78         {
  79             real_screen = screen;
  80             for(i = 0; i < num; i++)
  81             {
  82                 /* XGetWindowAttributes return 1 on success */
  83                 if(!XGetWindowAttributes(globalconf.display, wins[i], &wa)
  84                    || wa.override_redirect
  85                    || XGetTransientForHint(globalconf.display, wins[i], &d1))
  86                     continue;
  87                 if(wa.map_state == IsViewable || window_getstate(wins[i]) == IconicState)
  88                 {
  89                     if(screen == 0)
  90                         real_screen = screen_get_bycoord(wa.x, wa.y);
  91                     client_manage(wins[i], &wa, real_screen);
  92                 }
  93             }
  94             /* now the transients */
  95             for(i = 0; i < num; i++)
  96             {
  97                 if(!XGetWindowAttributes(globalconf.display, wins[i], &wa))
  98                     continue;
  99                 if(XGetTransientForHint(globalconf.display, wins[i], &d1)
 100                    && (wa.map_state == IsViewable || window_getstate(wins[i]) == IconicState))
 101                 {
 102                     if(screen == 0)
 103                         real_screen = screen_get_bycoord(wa.x, wa.y);
 104                     client_manage(wins[i], &wa, real_screen);
 105                 }
 106             }
 107         }
 108         if(wins)
 109             XFree(wins);
 110     }
 111 }
 112
 113 /** Setup everything before running
 114  * \param screen Screen number
 115  * \todo clean things...
 116  */
 117 static void
 118 setup(int screen)
 119 {
 120     XSetWindowAttributes wa;
 121     Statusbar *statusbar;
 122     int phys_screen = get_phys_screen(screen);
 123
 124     /* init cursors */
 125     globalconf.cursor[CurNormal] = XCreateFontCursor(globalconf.display, XC_left_ptr);
 126     globalconf.cursor[CurResize] = XCreateFontCursor(globalconf.display, XC_sizing);
 127     globalconf.cursor[CurMove] = XCreateFontCursor(globalconf.display, XC_fleur);
 128
 129     /* select for events */
 130     wa.event_mask = SubstructureRedirectMask | SubstructureNotifyMask
 131         | EnterWindowMask | LeaveWindowMask | StructureNotifyMask;
 132     wa.cursor = globalconf.cursor[CurNormal];
 133
 134     XChangeWindowAttributes(globalconf.display,
 135                             RootWindow(globalconf.display, phys_screen),
 136                             CWEventMask | CWCursor, &wa);
 137
 138     XSelectInput(globalconf.display,
 139                  RootWindow(globalconf.display, phys_screen),
 140                  wa.event_mask);
 141
 142     grabkeys(phys_screen);
 143
 144     for(statusbar = globalconf.screens[screen].statusbar; statusbar; statusbar = statusbar->next)
 145         statusbar_init(statusbar);
 146 }
 147
 148 /** Startup Error handler to check if another window manager
 149  * is already running.
 150  * \param disp Display
 151  * \param ee Error event
 152  */
 153 static int __attribute__ ((noreturn))
 154 xerrorstart(Display * disp __attribute__ ((unused)),
 155             XErrorEvent * ee __attribute__ ((unused)))
 156 {
 157     eprint("another window manager is already running\n");
 158 }
 159
 160 /** Quit awesome
 161  * \param screen Screen ID
 162  * \param arg nothing
 163  * \ingroup ui_callback
 164  */
 165 void
 166 uicb_quit(int screen __attribute__ ((unused)), char *arg __attribute__ ((unused)))
 167 {
 168     running = False;
 169 }
 170
 171 static void
 172 exit_on_signal(int sig __attribute__ ((unused)))
 173 {
 174     running = False;
 175 }
 176
 177 /* There's no way to check accesses to destroyed windows, thus those cases are
 178  * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
 179  * default error handler, which may call exit.
 180  */
 181 static int
 182 xerror(Display *edpy, XErrorEvent *ee)
 183 {
 184     if(ee->error_code == BadWindow
 185        || (ee->error_code == BadMatch && ee->request_code == X_SetInputFocus)
 186        || (ee->error_code == BadValue && ee->request_code == X_KillClient))
 187         return 0;
 188     warn("fatal error: request code=%d, error code=%d\n", ee->request_code, ee->error_code);
 189     return xerrorxlib(edpy, ee);        /* may call exit */
 190 }
 191
 192 /** Print help and exit(2) with given exit_code.
 193  */
 194 static void __attribute__ ((noreturn))
 195 exit_help(int exit_code)
 196 {
 197     FILE *outfile = (exit_code == EXIT_SUCCESS) ? stdout : stderr;
 198     fprintf(outfile,
 199 "Usage: awesome [OPTION]\n\
 200   -h, --help             show help\n\
 201   -v, --version          show version\n\
 202   -c, --config FILE      configuration file to use\n\
 203   -k, --check            check configuration file syntax\n");
 204     exit(exit_code);
 205 }
 206
 207 /** Hello, this is main
 208  * \param argc who knows
 209  * \param argv who knows
 210  * \return EXIT_SUCCESS I hope
 211  */
 212 typedef void event_handler (XEvent *);
 213 int
 214 main(int argc, char *argv[])
 215 {
 216     char buf[1024];
 217     const char *confpath = NULL;
 218     int r, xfd, e_dummy, csfd;
 219     fd_set rd;
 220     XEvent ev;
 221     Display * dpy;
 222     int shape_event, randr_event_base;
 223     int screen;
 224     int i, cmdlen;
 225     event_handler **handler;
 226     struct sockaddr_un *addr;
 227     int opt;
 228     Client *c;
 229     static struct option long_options[] =
 230     {
 231         {"help",    0, NULL, 'h'},
 232         {"version", 0, NULL, 'v'},
 233         {"check",   0, NULL, 'k'},
 234         {"config",  0, NULL, 'c'},
 235         {NULL,      0, NULL, 0}
 236     };
 237
 238     /* check args */
 239     while((opt = getopt_long(argc, argv, "vhkc:",
 240                              long_options, NULL)) != -1)
 241         switch(opt)
 242         {
 243           case 'v':
 244             eprint_version("awesome");
 245             break;
 246           case 'h':
 247             exit_help(EXIT_SUCCESS);
 248             break;
 249           case 'c':
 250             if(a_strlen(optarg))
 251                 confpath = optarg;
 252             else
 253                 eprint("-c option requires a file name\n");
 254             break;
 255           case 'k':
 256             return config_check(confpath);
 257             break;
 258         }
 259
 260     /* Text won't be printed correctly otherwise */
 261     setlocale(LC_CTYPE, "");
 262
 263     /* X stuff */
 264     if(!(dpy = XOpenDisplay(NULL)))
 265         eprint("cannot open display\n");
 266
 267     for(cmdlen = 0, i = 0; i < argc; i++)
 268         cmdlen += a_strlen(argv[i] + 1);
 269     globalconf.argv = p_new(char, cmdlen);
 270     a_strcpy(globalconf.argv, cmdlen, argv[0]);
 271     for(i = 1; i < argc; i++)
 272     {
 273         a_strcat(globalconf.argv, cmdlen, " ");
 274         a_strcat(globalconf.argv, cmdlen, argv[i]);
 275     }
 276
 277     xfd = ConnectionNumber(dpy);
 278
 279     XSetErrorHandler(xerrorstart);
 280     for(screen = 0; screen < ScreenCount(dpy); screen++)
 281         /* this causes an error if some other window manager is running */
 282         XSelectInput(dpy, RootWindow(dpy, screen), SubstructureRedirectMask);
 283
 284     /* need to XSync to validate errorhandler */
 285     XSync(dpy, False);
 286     XSetErrorHandler(NULL);
 287     xerrorxlib = XSetErrorHandler(xerror);
 288     XSync(dpy, False);
 289
 290     /* store display */
 291     globalconf.display = dpy;
 292
 293     /* init EWMH atoms */
 294     ewmh_init_atoms();
 295
 296     /* init screens struct */
 297     screen_build_screens();
 298     focus_add_client(NULL);
 299
 300     /* parse config */
 301     config_parse(confpath);
 302
 303     scan();
 304
 305     /* for each virtual screen */
 306     for(screen = 0; screen < globalconf.nscreen; screen++)
 307         setup(screen);
 308
 309     /* do this only for real screen */
 310     for(screen = 0; screen < ScreenCount(dpy); screen++)
 311     {
 312         loadawesomeprops(screen);
 313         ewmh_set_supported_hints(screen);
 314         /* call this to at least grab root window clicks */
 315         window_root_grabbuttons(screen);
 316     }
 317
 318     handler = p_new(event_handler *, LASTEvent);
 319     handler[ButtonPress] = handle_event_buttonpress;
 320     handler[ConfigureRequest] = handle_event_configurerequest;
 321     handler[ConfigureNotify] = handle_event_configurenotify;
 322     handler[DestroyNotify] = handle_event_destroynotify;
 323     handler[EnterNotify] = handle_event_enternotify;
 324     handler[LeaveNotify] = handle_event_leavenotify;
 325     handler[Expose] = handle_event_expose;
 326     handler[KeyPress] = handle_event_keypress;
 327     handler[MappingNotify] = handle_event_mappingnotify;
 328     handler[MapRequest] = handle_event_maprequest;
 329     handler[PropertyNotify] = handle_event_propertynotify;
 330     handler[UnmapNotify] = handle_event_unmapnotify;
 331     handler[ClientMessage] = handle_event_clientmessage;
 332
 333     /* check for shape extension */
 334     if((globalconf.have_shape = XShapeQueryExtension(dpy, &shape_event, &e_dummy)))
 335     {
 336         p_realloc(&handler, shape_event + 1);
 337         handler[shape_event] = handle_event_shape;
 338     }
 339
 340     /* check for randr extension */
 341     if((globalconf.have_randr = XRRQueryExtension(dpy, &randr_event_base, &e_dummy)))
 342     {
 343         p_realloc(&handler, randr_event_base + RRScreenChangeNotify + 1);
 344         handler[randr_event_base + RRScreenChangeNotify] = handle_event_randr_screen_change_notify;
 345     }
 346
 347     XSync(dpy, False);
 348
 349     /* get socket fd */
 350     csfd = get_client_socket();
 351     addr = get_client_addr(getenv("DISPLAY"));
 352
 353     if(bind(csfd, (const struct sockaddr *) addr, SUN_LEN(addr)))
 354     {
 355         if(errno == EADDRINUSE)
 356         {
 357             if(unlink(addr->sun_path))
 358                 perror("error unlinking existing file");
 359             if(bind(csfd, (const struct sockaddr *) addr, SUN_LEN(addr)))
 360                 perror("error binding UNIX domain socket");
 361         }
 362         else
 363             perror("error binding UNIX domain socket");
 364     }
 365
 366     /* register function for signals */
 367     signal(SIGINT, &exit_on_signal);
 368     signal(SIGTERM, &exit_on_signal);
 369     signal(SIGHUP, &exit_on_signal);
 370
 371     /* refresh everything before waiting events */
 372     statusbar_refresh();
 373     layout_refresh();
 374
 375     /* main event loop, also reads status text from socket */
 376     while(running)
 377     {
 378         FD_ZERO(&rd);
 379         if(csfd >= 0)
 380             FD_SET(csfd, &rd);
 381         FD_SET(xfd, &rd);
 382         if(select(MAX(xfd, csfd) + 1, &rd, NULL, NULL, NULL) == -1)
 383         {
 384             if(errno == EINTR)
 385                 continue;
 386             eprint("select failed\n");
 387         }
 388         if(csfd >= 0 && FD_ISSET(csfd, &rd))
 389             switch (r = recv(csfd, buf, sizeof(buf)-1, MSG_TRUNC))
 390             {
 391               case -1:
 392                 perror("awesome: error reading UNIX domain socket");
 393                 csfd = -1;
 394                 break;
 395               case 0:
 396                 break;
 397               default:
 398                 if(r >= ssizeof(buf))
 399                     break;
 400                 buf[r] = '\0';
 401                 parse_control(buf);
 402                 statusbar_refresh();
 403                 layout_refresh();
 404             }
 405         /* two level XPending:
 406          * we need to first check we have XEvent to handle
 407          * and if so, we handle them all in a round.
 408          * Then when we have refresh()'ed stuff so maybe new XEvent
 409          * are available and select() won't tell us, so let's check
 410          * with XPending() again.
 411          */
 412         while(XPending(dpy))
 413         {
 414             while(XPending(dpy))
 415             {
 416                 XNextEvent(dpy, &ev);
 417                 if(handler[ev.type])
 418                     handler[ev.type](&ev);
 419
 420                 /* drop events requested to */
 421                 if(globalconf.drop_events)
 422                 {
 423                     /* need to resync */
 424                     XSync(dpy, False);
 425                     while(XCheckMaskEvent(dpy, globalconf.drop_events, &ev));
 426                     globalconf.drop_events = NoEventMask;
 427                 }
 428
 429                 /* need to resync */
 430                 XSync(dpy, False);
 431             }
 432
 433             statusbar_refresh();
 434             layout_refresh();
 435
 436             /* need to resync */
 437             XSync(dpy, False);
 438         }
 439     }
 440
 441
 442     if(csfd > 0 && close(csfd))
 443         perror("error closing UNIX domain socket");
 444     if(unlink(addr->sun_path))
 445         perror("error unlinking UNIX domain socket");
 446     p_delete(&addr);
 447
 448     /* remap all clients since some WM won't handle them otherwise */
 449     for(c = globalconf.clients; c; c = c->next)
 450         client_unban(c);
 451
 452     XSync(globalconf.display, False);
 453
 454     XCloseDisplay(dpy);
 455
 456     return EXIT_SUCCESS;
 457 }
 458 // vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80